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/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --abstractinterpretationv2.abstract.domain IntervalDomain --traceabstraction.trace.refinement.strategy TAIPAN --traceabstraction.abstract.interpretation.mode USE_PREDICATES -i ../../../trunk/examples/svcomp/loop-industry-pattern/nested-3.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:04:53,468 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:04:53,470 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:04:53,484 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:04:53,484 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:04:53,485 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:04:53,486 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:04:53,488 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:04:53,490 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:04:53,491 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:04:53,491 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:04:53,500 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:04:53,501 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:04:53,502 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:04:53,503 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:04:53,504 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:04:53,507 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:04:53,507 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:04:53,509 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:04:53,513 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:04:53,514 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:04:53,516 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:04:53,518 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:04:53,519 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:04:53,523 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:04:53,529 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-15 01:04:53,530 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-15 01:04:53,531 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-15 01:04:53,531 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-15 01:04:53,535 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-15 01:04:53,535 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-15 01:04:53,536 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-15 01:04:53,536 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-15 01:04:53,536 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:04:53,538 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:04:53,541 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:04:53,542 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-15 01:04:53,560 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:04:53,561 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:04:53,562 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:04:53,562 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:04:53,562 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:04:53,562 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:04:53,563 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:04:53,563 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:04:53,563 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:04:53,563 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:04:53,563 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:04:53,564 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:04:53,564 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:04:53,564 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:04:53,564 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:04:53,564 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:04:53,565 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:04:53,565 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:04:53,565 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:04:53,565 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:04:53,565 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:04:53,566 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:04:53,566 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:04:53,566 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:04:53,566 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:04:53,566 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:04:53,566 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:04:53,567 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:04:53,567 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: Abstract domain -> IntervalDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Abstract interpretation Mode -> USE_PREDICATES [2019-10-15 01:04:53,840 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:04:53,859 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:04:53,863 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:04:53,864 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:04:53,864 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:04:53,865 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/nested-3.c [2019-10-15 01:04:53,922 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8144142b7/b35affdabb314a988fa7fa534eea6949/FLAG4a6a2f99f [2019-10-15 01:04:54,357 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:04:54,358 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/nested-3.c [2019-10-15 01:04:54,366 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8144142b7/b35affdabb314a988fa7fa534eea6949/FLAG4a6a2f99f [2019-10-15 01:04:54,731 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8144142b7/b35affdabb314a988fa7fa534eea6949 [2019-10-15 01:04:54,742 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:04:54,747 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:04:54,748 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:04:54,748 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:04:54,751 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:04:54,752 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:04:54" (1/1) ... [2019-10-15 01:04:54,755 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@239f598d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:04:54, skipping insertion in model container [2019-10-15 01:04:54,756 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:04:54" (1/1) ... [2019-10-15 01:04:54,763 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:04:54,784 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:04:55,069 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:04:55,080 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:04:55,102 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:04:55,118 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:04:55,119 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:04:55 WrapperNode [2019-10-15 01:04:55,120 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:04:55,120 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:04:55,121 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:04:55,121 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:04:55,243 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:04:55" (1/1) ... [2019-10-15 01:04:55,244 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:04:55" (1/1) ... [2019-10-15 01:04:55,255 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:04:55" (1/1) ... [2019-10-15 01:04:55,256 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:04:55" (1/1) ... [2019-10-15 01:04:55,261 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:04:55" (1/1) ... [2019-10-15 01:04:55,267 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:04:55" (1/1) ... [2019-10-15 01:04:55,273 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:04:55" (1/1) ... [2019-10-15 01:04:55,280 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:04:55,280 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:04:55,281 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:04:55,281 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:04:55,282 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:04:55" (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 [2019-10-15 01:04:55,341 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:04:55,342 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:04:55,342 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:04:55,342 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:04:55,342 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:04:55,342 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:04:55,342 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:04:55,342 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:04:55,342 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:04:55,343 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:04:55,542 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:04:55,542 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-15 01:04:55,543 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:04:55 BoogieIcfgContainer [2019-10-15 01:04:55,543 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:04:55,544 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:04:55,545 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:04:55,548 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:04:55,548 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:04:54" (1/3) ... [2019-10-15 01:04:55,549 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14b167dc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:04:55, skipping insertion in model container [2019-10-15 01:04:55,549 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:04:55" (2/3) ... [2019-10-15 01:04:55,549 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14b167dc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:04:55, skipping insertion in model container [2019-10-15 01:04:55,550 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:04:55" (3/3) ... [2019-10-15 01:04:55,551 INFO L109 eAbstractionObserver]: Analyzing ICFG nested-3.c [2019-10-15 01:04:55,561 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:04:55,568 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:04:55,579 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:04:55,604 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:04:55,604 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:04:55,604 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:04:55,604 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:04:55,605 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:04:55,605 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:04:55,605 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:04:55,605 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:04:55,622 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2019-10-15 01:04:55,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-15 01:04:55,628 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:04:55,629 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:04:55,630 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:04:55,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:04:55,637 INFO L82 PathProgramCache]: Analyzing trace with hash 1419324422, now seen corresponding path program 1 times [2019-10-15 01:04:55,644 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:04:55,644 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1642400674] [2019-10-15 01:04:55,644 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:04:55,645 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:04:55,645 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:04:55,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:04:55,797 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:04:55,797 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1642400674] [2019-10-15 01:04:55,798 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:04:55,798 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:04:55,799 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964136833] [2019-10-15 01:04:55,803 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:04:55,805 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:04:55,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:04:55,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:04:55,823 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 3 states. [2019-10-15 01:04:55,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:04:55,949 INFO L93 Difference]: Finished difference Result 40 states and 61 transitions. [2019-10-15 01:04:55,950 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:04:55,952 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2019-10-15 01:04:55,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:04:55,963 INFO L225 Difference]: With dead ends: 40 [2019-10-15 01:04:55,974 INFO L226 Difference]: Without dead ends: 23 [2019-10-15 01:04:55,978 INFO L600 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 [2019-10-15 01:04:55,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-10-15 01:04:56,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2019-10-15 01:04:56,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-15 01:04:56,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2019-10-15 01:04:56,020 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 14 [2019-10-15 01:04:56,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:04:56,021 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2019-10-15 01:04:56,021 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:04:56,021 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2019-10-15 01:04:56,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-15 01:04:56,022 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:04:56,022 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:04:56,023 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:04:56,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:04:56,023 INFO L82 PathProgramCache]: Analyzing trace with hash -1519544262, now seen corresponding path program 1 times [2019-10-15 01:04:56,024 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:04:56,024 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1361708785] [2019-10-15 01:04:56,024 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:04:56,025 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:04:56,025 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:04:56,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:04:56,087 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:04:56,087 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1361708785] [2019-10-15 01:04:56,088 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1397535948] [2019-10-15 01:04:56,088 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:04:56,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:04:56,141 INFO L256 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 2 conjunts are in the unsatisfiable core [2019-10-15 01:04:56,146 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:04:56,181 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:04:56,182 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:04:56,200 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:04:56,201 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-15 01:04:56,201 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4] total 5 [2019-10-15 01:04:56,202 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223535059] [2019-10-15 01:04:56,204 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:04:56,204 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:04:56,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:04:56,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:04:56,205 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand 3 states. [2019-10-15 01:04:56,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:04:56,255 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2019-10-15 01:04:56,256 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:04:56,256 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2019-10-15 01:04:56,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:04:56,258 INFO L225 Difference]: With dead ends: 37 [2019-10-15 01:04:56,258 INFO L226 Difference]: Without dead ends: 23 [2019-10-15 01:04:56,260 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:04:56,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-10-15 01:04:56,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2019-10-15 01:04:56,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-10-15 01:04:56,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2019-10-15 01:04:56,270 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 17 [2019-10-15 01:04:56,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:04:56,270 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2019-10-15 01:04:56,270 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:04:56,270 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2019-10-15 01:04:56,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-15 01:04:56,271 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:04:56,271 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:04:56,475 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:04:56,476 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:04:56,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:04:56,477 INFO L82 PathProgramCache]: Analyzing trace with hash -1517697220, now seen corresponding path program 1 times [2019-10-15 01:04:56,478 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:04:56,478 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1096735350] [2019-10-15 01:04:56,478 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:04:56,479 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:04:56,479 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:04:56,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:04:56,529 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:04:56,530 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1096735350] [2019-10-15 01:04:56,530 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1388665488] [2019-10-15 01:04:56,531 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:04:56,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:04:56,583 INFO L256 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:04:56,586 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:04:56,596 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:04:56,596 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:04:56,626 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:04:56,627 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1852603015] [2019-10-15 01:04:56,633 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 18 [2019-10-15 01:04:56,669 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-15 01:04:56,669 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-15 01:04:56,732 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-15 01:04:56,735 INFO L272 AbstractInterpreter]: Visited 11 different actions 14 times. Merged at 2 different actions 2 times. Never widened. Performed 25 root evaluator evaluations with a maximum evaluation depth of 4. Performed 25 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 1 fixpoints after 1 different actions. Largest state had 8 variables. [2019-10-15 01:04:56,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:04:56,738 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates [2019-10-15 01:04:56,798 INFO L227 lantSequenceWeakener]: Weakened 9 states. On average, predicates are now at 61.11% of their original sizes. [2019-10-15 01:04:56,798 INFO L551 sIntCurrentIteration]: Unifying AI predicates [2019-10-15 01:04:56,848 INFO L553 sIntCurrentIteration]: We unified 16 AI predicates to 16 [2019-10-15 01:04:56,848 INFO L562 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-10-15 01:04:56,849 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:04:56,849 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [4, 4, 4] total 10 [2019-10-15 01:04:56,849 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826346393] [2019-10-15 01:04:56,850 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-15 01:04:56,851 INFO L137 tionRefinementEngine]: Using predicate unifier AbsIntPredicateUnifier provided by strategy TAIPAN [2019-10-15 01:04:56,851 INFO L124 tionRefinementEngine]: Using hoare triple checker CachingHoareTripleCheckerMap provided by strategy [2019-10-15 01:04:56,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-15 01:04:56,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:04:56,852 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 6 states. [2019-10-15 01:04:57,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:04:57,003 INFO L93 Difference]: Finished difference Result 46 states and 59 transitions. [2019-10-15 01:04:57,003 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-15 01:04:57,003 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2019-10-15 01:04:57,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:04:57,005 INFO L225 Difference]: With dead ends: 46 [2019-10-15 01:04:57,006 INFO L226 Difference]: Without dead ends: 31 [2019-10-15 01:04:57,007 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:04:57,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-15 01:04:57,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 25. [2019-10-15 01:04:57,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-10-15 01:04:57,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2019-10-15 01:04:57,023 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 17 [2019-10-15 01:04:57,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:04:57,024 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2019-10-15 01:04:57,024 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-15 01:04:57,025 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2019-10-15 01:04:57,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-15 01:04:57,025 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:04:57,026 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:04:57,226 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:04:57,227 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:04:57,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:04:57,227 INFO L82 PathProgramCache]: Analyzing trace with hash -837638850, now seen corresponding path program 1 times [2019-10-15 01:04:57,227 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:04:57,228 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1003722214] [2019-10-15 01:04:57,228 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:04:57,228 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:04:57,228 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:04:57,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:04:57,275 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:04:57,275 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1003722214] [2019-10-15 01:04:57,275 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [588457325] [2019-10-15 01:04:57,276 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:04:57,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:04:57,333 INFO L256 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 2 conjunts are in the unsatisfiable core [2019-10-15 01:04:57,335 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:04:57,352 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:04:57,352 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:04:57,365 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:04:57,366 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-15 01:04:57,366 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4] total 5 [2019-10-15 01:04:57,367 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754731047] [2019-10-15 01:04:57,367 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:04:57,367 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:04:57,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:04:57,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:04:57,368 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 3 states. [2019-10-15 01:04:57,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:04:57,398 INFO L93 Difference]: Finished difference Result 49 states and 64 transitions. [2019-10-15 01:04:57,400 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:04:57,400 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2019-10-15 01:04:57,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:04:57,404 INFO L225 Difference]: With dead ends: 49 [2019-10-15 01:04:57,404 INFO L226 Difference]: Without dead ends: 34 [2019-10-15 01:04:57,405 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:04:57,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-15 01:04:57,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 31. [2019-10-15 01:04:57,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-10-15 01:04:57,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 39 transitions. [2019-10-15 01:04:57,419 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 39 transitions. Word has length 17 [2019-10-15 01:04:57,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:04:57,421 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 39 transitions. [2019-10-15 01:04:57,421 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:04:57,422 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 39 transitions. [2019-10-15 01:04:57,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-15 01:04:57,422 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:04:57,423 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:04:57,632 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:04:57,633 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:04:57,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:04:57,633 INFO L82 PathProgramCache]: Analyzing trace with hash -780380548, now seen corresponding path program 1 times [2019-10-15 01:04:57,633 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:04:57,633 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [579400725] [2019-10-15 01:04:57,633 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:04:57,634 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:04:57,634 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:04:57,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:04:57,675 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:04:57,675 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [579400725] [2019-10-15 01:04:57,676 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1902779784] [2019-10-15 01:04:57,676 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:04:57,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:04:57,706 INFO L256 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:04:57,708 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:04:57,712 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:04:57,712 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:04:57,742 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:04:57,742 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1795391180] [2019-10-15 01:04:57,742 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 18 [2019-10-15 01:04:57,744 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-15 01:04:57,744 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-15 01:04:57,801 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-10-15 01:04:57,802 INFO L272 AbstractInterpreter]: Visited 17 different actions 37 times. Merged at 3 different actions 15 times. Widened at 1 different actions 1 times. Performed 76 root evaluator evaluations with a maximum evaluation depth of 6. Performed 76 inverse root evaluator evaluations with a maximum inverse evaluation depth of 6. Found 1 fixpoints after 1 different actions. Largest state had 8 variables. [2019-10-15 01:04:57,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:04:57,804 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:04:57,804 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:04:57,805 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2019-10-15 01:04:57,805 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403158536] [2019-10-15 01:04:57,805 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-15 01:04:57,806 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:04:57,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-15 01:04:57,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:04:57,806 INFO L87 Difference]: Start difference. First operand 31 states and 39 transitions. Second operand 6 states. [2019-10-15 01:04:57,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:04:57,880 INFO L93 Difference]: Finished difference Result 75 states and 102 transitions. [2019-10-15 01:04:57,880 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-15 01:04:57,880 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2019-10-15 01:04:57,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:04:57,882 INFO L225 Difference]: With dead ends: 75 [2019-10-15 01:04:57,882 INFO L226 Difference]: Without dead ends: 56 [2019-10-15 01:04:57,882 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:04:57,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-10-15 01:04:57,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 54. [2019-10-15 01:04:57,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2019-10-15 01:04:57,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2019-10-15 01:04:57,893 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 17 [2019-10-15 01:04:57,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:04:57,893 INFO L462 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2019-10-15 01:04:57,893 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-15 01:04:57,893 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2019-10-15 01:04:57,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-10-15 01:04:57,895 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:04:57,895 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:04:58,098 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:04:58,099 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:04:58,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:04:58,099 INFO L82 PathProgramCache]: Analyzing trace with hash 1205198858, now seen corresponding path program 1 times [2019-10-15 01:04:58,100 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:04:58,100 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1902076513] [2019-10-15 01:04:58,101 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:04:58,101 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:04:58,101 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:04:58,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:04:58,260 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:04:58,261 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1902076513] [2019-10-15 01:04:58,261 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1051247454] [2019-10-15 01:04:58,263 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:04:58,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:04:58,309 INFO L256 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:04:58,311 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:04:58,350 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-15 01:04:58,350 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:04:58,382 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-15 01:04:58,382 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-15 01:04:58,383 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [10] total 12 [2019-10-15 01:04:58,383 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [530203839] [2019-10-15 01:04:58,383 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:04:58,384 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:04:58,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:04:58,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2019-10-15 01:04:58,384 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand 4 states. [2019-10-15 01:04:58,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:04:58,426 INFO L93 Difference]: Finished difference Result 96 states and 123 transitions. [2019-10-15 01:04:58,426 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:04:58,427 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 26 [2019-10-15 01:04:58,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:04:58,428 INFO L225 Difference]: With dead ends: 96 [2019-10-15 01:04:58,428 INFO L226 Difference]: Without dead ends: 54 [2019-10-15 01:04:58,429 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2019-10-15 01:04:58,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-15 01:04:58,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 41. [2019-10-15 01:04:58,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-10-15 01:04:58,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 48 transitions. [2019-10-15 01:04:58,436 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 48 transitions. Word has length 26 [2019-10-15 01:04:58,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:04:58,436 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 48 transitions. [2019-10-15 01:04:58,436 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:04:58,437 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 48 transitions. [2019-10-15 01:04:58,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-10-15 01:04:58,437 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:04:58,438 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:04:58,649 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:04:58,650 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:04:58,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:04:58,651 INFO L82 PathProgramCache]: Analyzing trace with hash 183500618, now seen corresponding path program 2 times [2019-10-15 01:04:58,651 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:04:58,651 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1759366151] [2019-10-15 01:04:58,652 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:04:58,652 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:04:58,652 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:04:58,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:04:58,726 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:04:58,727 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1759366151] [2019-10-15 01:04:58,727 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1643793462] [2019-10-15 01:04:58,727 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:04:58,760 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:04:58,760 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:04:58,761 INFO L256 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-15 01:04:58,763 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:04:58,791 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-15 01:04:58,793 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:04:58,817 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-15 01:04:58,817 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-15 01:04:58,817 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [9] total 11 [2019-10-15 01:04:58,818 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [645249794] [2019-10-15 01:04:58,818 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:04:58,818 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:04:58,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:04:58,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2019-10-15 01:04:58,820 INFO L87 Difference]: Start difference. First operand 41 states and 48 transitions. Second operand 4 states. [2019-10-15 01:04:58,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:04:58,886 INFO L93 Difference]: Finished difference Result 93 states and 111 transitions. [2019-10-15 01:04:58,886 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-15 01:04:58,886 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 26 [2019-10-15 01:04:58,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:04:58,888 INFO L225 Difference]: With dead ends: 93 [2019-10-15 01:04:58,888 INFO L226 Difference]: Without dead ends: 58 [2019-10-15 01:04:58,889 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2019-10-15 01:04:58,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-10-15 01:04:58,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 43. [2019-10-15 01:04:58,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-10-15 01:04:58,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2019-10-15 01:04:58,896 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 26 [2019-10-15 01:04:58,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:04:58,897 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2019-10-15 01:04:58,897 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:04:58,897 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2019-10-15 01:04:58,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-10-15 01:04:58,898 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:04:58,898 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:04:59,099 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:04:59,100 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:04:59,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:04:59,101 INFO L82 PathProgramCache]: Analyzing trace with hash 240758920, now seen corresponding path program 1 times [2019-10-15 01:04:59,101 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:04:59,102 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610636526] [2019-10-15 01:04:59,102 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:04:59,102 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:04:59,103 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:04:59,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:04:59,184 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:04:59,184 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610636526] [2019-10-15 01:04:59,184 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [4259230] [2019-10-15 01:04:59,185 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:04:59,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:04:59,227 INFO L256 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-15 01:04:59,235 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:04:59,245 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:04:59,245 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:04:59,307 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:04:59,308 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [555089042] [2019-10-15 01:04:59,308 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 27 [2019-10-15 01:04:59,310 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-15 01:04:59,311 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-15 01:04:59,337 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-10-15 01:04:59,337 INFO L272 AbstractInterpreter]: Visited 18 different actions 51 times. Merged at 4 different actions 21 times. Widened at 1 different actions 1 times. Performed 116 root evaluator evaluations with a maximum evaluation depth of 6. Performed 116 inverse root evaluator evaluations with a maximum inverse evaluation depth of 6. Found 8 fixpoints after 3 different actions. Largest state had 8 variables. [2019-10-15 01:04:59,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:04:59,338 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:04:59,338 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:04:59,338 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2019-10-15 01:04:59,338 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181105623] [2019-10-15 01:04:59,339 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-15 01:04:59,339 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:04:59,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-15 01:04:59,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2019-10-15 01:04:59,340 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 12 states. [2019-10-15 01:04:59,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:04:59,441 INFO L93 Difference]: Finished difference Result 129 states and 169 transitions. [2019-10-15 01:04:59,441 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-15 01:04:59,442 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 26 [2019-10-15 01:04:59,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:04:59,443 INFO L225 Difference]: With dead ends: 129 [2019-10-15 01:04:59,444 INFO L226 Difference]: Without dead ends: 92 [2019-10-15 01:04:59,445 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2019-10-15 01:04:59,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2019-10-15 01:04:59,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 79. [2019-10-15 01:04:59,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2019-10-15 01:04:59,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 93 transitions. [2019-10-15 01:04:59,455 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 93 transitions. Word has length 26 [2019-10-15 01:04:59,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:04:59,455 INFO L462 AbstractCegarLoop]: Abstraction has 79 states and 93 transitions. [2019-10-15 01:04:59,455 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-15 01:04:59,456 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 93 transitions. [2019-10-15 01:04:59,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-10-15 01:04:59,457 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:04:59,457 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:04:59,661 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:04:59,661 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:04:59,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:04:59,662 INFO L82 PathProgramCache]: Analyzing trace with hash 1695561928, now seen corresponding path program 2 times [2019-10-15 01:04:59,663 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:04:59,663 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1224514278] [2019-10-15 01:04:59,664 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:04:59,664 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:04:59,664 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:04:59,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:04:59,802 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:04:59,803 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1224514278] [2019-10-15 01:04:59,803 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1576541991] [2019-10-15 01:04:59,803 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:04:59,842 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 01:04:59,842 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:04:59,844 INFO L256 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-15 01:04:59,847 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:04:59,938 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:04:59,993 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2019-10-15 01:04:59,994 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:05:00,068 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:05:00,116 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:05:00,149 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2019-10-15 01:05:00,149 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-15 01:05:00,149 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [13, 8] total 26 [2019-10-15 01:05:00,150 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834952592] [2019-10-15 01:05:00,150 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-15 01:05:00,150 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:05:00,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-15 01:05:00,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=502, Unknown=0, NotChecked=0, Total=650 [2019-10-15 01:05:00,151 INFO L87 Difference]: Start difference. First operand 79 states and 93 transitions. Second operand 9 states. [2019-10-15 01:05:00,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:05:00,276 INFO L93 Difference]: Finished difference Result 153 states and 181 transitions. [2019-10-15 01:05:00,277 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-15 01:05:00,277 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 44 [2019-10-15 01:05:00,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:05:00,278 INFO L225 Difference]: With dead ends: 153 [2019-10-15 01:05:00,278 INFO L226 Difference]: Without dead ends: 151 [2019-10-15 01:05:00,279 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=154, Invalid=548, Unknown=0, NotChecked=0, Total=702 [2019-10-15 01:05:00,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2019-10-15 01:05:00,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 150. [2019-10-15 01:05:00,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2019-10-15 01:05:00,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 178 transitions. [2019-10-15 01:05:00,296 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 178 transitions. Word has length 44 [2019-10-15 01:05:00,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:05:00,296 INFO L462 AbstractCegarLoop]: Abstraction has 150 states and 178 transitions. [2019-10-15 01:05:00,296 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-15 01:05:00,297 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 178 transitions. [2019-10-15 01:05:00,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-10-15 01:05:00,298 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:05:00,298 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:05:00,510 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:05:00,510 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:05:00,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:05:00,511 INFO L82 PathProgramCache]: Analyzing trace with hash 563878470, now seen corresponding path program 3 times [2019-10-15 01:05:00,511 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:05:00,512 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [160859138] [2019-10-15 01:05:00,512 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:00,512 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:00,513 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:05:00,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:05:00,660 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:05:00,661 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [160859138] [2019-10-15 01:05:00,661 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1147012225] [2019-10-15 01:05:00,661 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:05:00,701 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:05:00,701 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:05:00,702 INFO L256 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-15 01:05:00,704 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:05:00,714 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:05:00,714 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:05:00,917 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:05:00,918 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [801711229] [2019-10-15 01:05:00,918 INFO L195 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-10-15 01:05:00,918 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-10-15 01:05:00,918 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:05:00,918 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2019-10-15 01:05:00,918 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40545212] [2019-10-15 01:05:00,919 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-15 01:05:00,919 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:05:00,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-15 01:05:00,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2019-10-15 01:05:00,920 INFO L87 Difference]: Start difference. First operand 150 states and 178 transitions. Second operand 24 states. [2019-10-15 01:05:01,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:05:01,112 INFO L93 Difference]: Finished difference Result 423 states and 562 transitions. [2019-10-15 01:05:01,114 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-15 01:05:01,115 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 44 [2019-10-15 01:05:01,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:05:01,119 INFO L225 Difference]: With dead ends: 423 [2019-10-15 01:05:01,119 INFO L226 Difference]: Without dead ends: 342 [2019-10-15 01:05:01,120 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2019-10-15 01:05:01,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2019-10-15 01:05:01,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 294. [2019-10-15 01:05:01,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 294 states. [2019-10-15 01:05:01,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 346 transitions. [2019-10-15 01:05:01,145 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 346 transitions. Word has length 44 [2019-10-15 01:05:01,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:05:01,146 INFO L462 AbstractCegarLoop]: Abstraction has 294 states and 346 transitions. [2019-10-15 01:05:01,146 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-15 01:05:01,146 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 346 transitions. [2019-10-15 01:05:01,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2019-10-15 01:05:01,149 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:05:01,149 INFO L380 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:05:01,353 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:05:01,353 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:05:01,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:05:01,354 INFO L82 PathProgramCache]: Analyzing trace with hash 1199010758, now seen corresponding path program 4 times [2019-10-15 01:05:01,354 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:05:01,354 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2088426472] [2019-10-15 01:05:01,354 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:01,354 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:01,354 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:05:01,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:05:01,708 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 0 proven. 715 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:05:01,708 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2088426472] [2019-10-15 01:05:01,709 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [299248804] [2019-10-15 01:05:01,709 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:05:01,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:05:01,756 INFO L256 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 24 conjunts are in the unsatisfiable core [2019-10-15 01:05:01,759 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:05:01,780 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 0 proven. 715 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:05:01,780 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:05:02,543 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 0 proven. 715 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:05:02,544 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [456214295] [2019-10-15 01:05:02,544 INFO L195 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-10-15 01:05:02,544 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-10-15 01:05:02,544 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:05:02,544 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2019-10-15 01:05:02,545 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1774093136] [2019-10-15 01:05:02,545 INFO L442 AbstractCegarLoop]: Interpolant automaton has 48 states [2019-10-15 01:05:02,546 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:05:02,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2019-10-15 01:05:02,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2019-10-15 01:05:02,548 INFO L87 Difference]: Start difference. First operand 294 states and 346 transitions. Second operand 48 states. [2019-10-15 01:05:02,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:05:02,888 INFO L93 Difference]: Finished difference Result 831 states and 1102 transitions. [2019-10-15 01:05:02,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2019-10-15 01:05:02,889 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 80 [2019-10-15 01:05:02,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:05:02,894 INFO L225 Difference]: With dead ends: 831 [2019-10-15 01:05:02,894 INFO L226 Difference]: Without dead ends: 678 [2019-10-15 01:05:02,901 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2019-10-15 01:05:02,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 678 states. [2019-10-15 01:05:02,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 678 to 582. [2019-10-15 01:05:02,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 582 states. [2019-10-15 01:05:02,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 582 states to 582 states and 682 transitions. [2019-10-15 01:05:02,941 INFO L78 Accepts]: Start accepts. Automaton has 582 states and 682 transitions. Word has length 80 [2019-10-15 01:05:02,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:05:02,942 INFO L462 AbstractCegarLoop]: Abstraction has 582 states and 682 transitions. [2019-10-15 01:05:02,942 INFO L463 AbstractCegarLoop]: Interpolant automaton has 48 states. [2019-10-15 01:05:02,942 INFO L276 IsEmpty]: Start isEmpty. Operand 582 states and 682 transitions. [2019-10-15 01:05:02,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2019-10-15 01:05:02,954 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:05:02,954 INFO L380 BasicCegarLoop]: trace histogram [46, 46, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:05:03,158 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:05:03,159 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:05:03,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:05:03,159 INFO L82 PathProgramCache]: Analyzing trace with hash 1952573126, now seen corresponding path program 5 times [2019-10-15 01:05:03,160 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:05:03,160 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1489680095] [2019-10-15 01:05:03,160 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:03,160 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:03,160 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:05:03,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:05:04,572 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 0 proven. 3151 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:05:04,572 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1489680095] [2019-10-15 01:05:04,573 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1582929308] [2019-10-15 01:05:04,573 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:05:04,639 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 01:05:04,639 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:05:04,640 INFO L256 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-15 01:05:04,645 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:05:04,875 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:05:04,995 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 136 proven. 0 refuted. 0 times theorem prover too weak. 3015 trivial. 0 not checked. [2019-10-15 01:05:04,995 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:05:05,188 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:05:05,291 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:05:05,368 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 3015 trivial. 0 not checked. [2019-10-15 01:05:05,369 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-15 01:05:05,369 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [49, 8] total 62 [2019-10-15 01:05:05,369 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994235248] [2019-10-15 01:05:05,370 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-15 01:05:05,370 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:05:05,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-15 01:05:05,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1318, Invalid=2464, Unknown=0, NotChecked=0, Total=3782 [2019-10-15 01:05:05,373 INFO L87 Difference]: Start difference. First operand 582 states and 682 transitions. Second operand 9 states. [2019-10-15 01:05:05,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:05:05,496 INFO L93 Difference]: Finished difference Result 591 states and 691 transitions. [2019-10-15 01:05:05,496 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-15 01:05:05,496 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 152 [2019-10-15 01:05:05,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:05:05,499 INFO L225 Difference]: With dead ends: 591 [2019-10-15 01:05:05,500 INFO L226 Difference]: Without dead ends: 589 [2019-10-15 01:05:05,502 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 292 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 562 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1324, Invalid=2582, Unknown=0, NotChecked=0, Total=3906 [2019-10-15 01:05:05,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 589 states. [2019-10-15 01:05:05,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 589 to 582. [2019-10-15 01:05:05,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 582 states. [2019-10-15 01:05:05,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 582 states to 582 states and 682 transitions. [2019-10-15 01:05:05,528 INFO L78 Accepts]: Start accepts. Automaton has 582 states and 682 transitions. Word has length 152 [2019-10-15 01:05:05,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:05:05,529 INFO L462 AbstractCegarLoop]: Abstraction has 582 states and 682 transitions. [2019-10-15 01:05:05,529 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-15 01:05:05,529 INFO L276 IsEmpty]: Start isEmpty. Operand 582 states and 682 transitions. [2019-10-15 01:05:05,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2019-10-15 01:05:05,534 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:05:05,534 INFO L380 BasicCegarLoop]: trace histogram [92, 92, 90, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:05:05,741 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:05:05,742 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:05:05,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:05:05,742 INFO L82 PathProgramCache]: Analyzing trace with hash -1195976709, now seen corresponding path program 1 times [2019-10-15 01:05:05,742 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:05:05,742 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [911361327] [2019-10-15 01:05:05,743 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:05,743 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:05:05,743 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:05:05,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:05:09,046 INFO L134 CoverageAnalysis]: Checked inductivity of 12749 backedges. 97 proven. 12652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:05:09,047 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [911361327] [2019-10-15 01:05:09,047 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [854901429] [2019-10-15 01:05:09,047 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:05:09,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:05:09,142 INFO L256 TraceCheckSpWp]: Trace formula consists of 442 conjuncts, 48 conjunts are in the unsatisfiable core [2019-10-15 01:05:09,149 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:05:11,047 INFO L134 CoverageAnalysis]: Checked inductivity of 12749 backedges. 6442 proven. 3151 refuted. 0 times theorem prover too weak. 3156 trivial. 0 not checked. [2019-10-15 01:05:11,047 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:05:14,386 INFO L134 CoverageAnalysis]: Checked inductivity of 12749 backedges. 6444 proven. 3151 refuted. 0 times theorem prover too weak. 3154 trivial. 0 not checked. [2019-10-15 01:05:14,386 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [53520786] [2019-10-15 01:05:14,386 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 300 [2019-10-15 01:05:14,389 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-15 01:05:14,389 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-15 01:05:14,495 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-10-15 01:05:14,496 INFO L272 AbstractInterpreter]: Visited 21 different actions 103 times. Merged at 9 different actions 46 times. Widened at 2 different actions 4 times. Performed 247 root evaluator evaluations with a maximum evaluation depth of 8. Performed 247 inverse root evaluator evaluations with a maximum inverse evaluation depth of 8. Found 15 fixpoints after 4 different actions. Largest state had 8 variables. [2019-10-15 01:05:14,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:05:14,496 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:05:14,496 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:05:14,496 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 49, 49] total 191 [2019-10-15 01:05:14,497 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122725039] [2019-10-15 01:05:14,498 INFO L442 AbstractCegarLoop]: Interpolant automaton has 191 states [2019-10-15 01:05:14,498 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:05:14,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 191 interpolants. [2019-10-15 01:05:14,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11330, Invalid=24960, Unknown=0, NotChecked=0, Total=36290 [2019-10-15 01:05:14,511 INFO L87 Difference]: Start difference. First operand 582 states and 682 transitions. Second operand 191 states.