java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf -i ../../../trunk/examples/svcomp/loop-new/count_by_2_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:37:53,792 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:37:53,794 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:37:53,806 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:37:53,806 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:37:53,807 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:37:53,809 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:37:53,811 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:37:53,813 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:37:53,813 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:37:53,814 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:37:53,815 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:37:53,816 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:37:53,817 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:37:53,818 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:37:53,819 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:37:53,820 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:37:53,822 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:37:53,825 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:37:53,827 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:37:53,828 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:37:53,829 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:37:53,832 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:37:53,833 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:37:53,833 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:37:53,834 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:37:53,835 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:37:53,836 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:37:53,837 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:37:53,838 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:37:53,838 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:37:53,839 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-24 12:37:53,842 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-24 12:37:53,858 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:37:53,859 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:37:53,860 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:37:53,860 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:37:53,860 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:37:53,861 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:37:53,861 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-24 12:37:53,861 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:37:53,861 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-24 12:37:53,862 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:37:53,862 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:37:53,862 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:37:53,862 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:37:53,863 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:37:53,864 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:37:53,864 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:37:53,864 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:37:53,864 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:37:53,865 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:37:53,865 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:37:53,865 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:37:53,865 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:37:53,866 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:37:53,866 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:37:53,866 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:37:53,866 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:37:53,867 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:37:53,867 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:37:53,867 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:37:53,867 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:37:53,868 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:37:53,868 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:37:53,868 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:37:53,868 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:37:53,868 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:37:53,869 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:37:53,925 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:37:53,944 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:37:53,949 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:37:53,951 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:37:53,951 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:37:53,952 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-new/count_by_2_true-unreach-call_true-termination.i [2018-10-24 12:37:54,016 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/ea8954110/a4526a919fef40088721127a628ab88a/FLAG3ec824e8f [2018-10-24 12:37:54,449 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:37:54,450 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_2_true-unreach-call_true-termination.i [2018-10-24 12:37:54,458 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/ea8954110/a4526a919fef40088721127a628ab88a/FLAG3ec824e8f [2018-10-24 12:37:54,478 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/ea8954110/a4526a919fef40088721127a628ab88a [2018-10-24 12:37:54,491 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:37:54,492 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:37:54,494 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:37:54,494 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:37:54,501 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:37:54,502 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:37:54" (1/1) ... [2018-10-24 12:37:54,506 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22ec437b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:37:54, skipping insertion in model container [2018-10-24 12:37:54,506 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:37:54" (1/1) ... [2018-10-24 12:37:54,516 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:37:54,537 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:37:54,730 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:37:54,735 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:37:54,752 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:37:54,769 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:37:54,770 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:37:54 WrapperNode [2018-10-24 12:37:54,770 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:37:54,771 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:37:54,771 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:37:54,771 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:37:54,780 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:37:54" (1/1) ... [2018-10-24 12:37:54,786 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:37:54" (1/1) ... [2018-10-24 12:37:54,793 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:37:54,793 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:37:54,793 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:37:54,793 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:37:54,807 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:37:54" (1/1) ... [2018-10-24 12:37:54,807 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:37:54" (1/1) ... [2018-10-24 12:37:54,808 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:37:54" (1/1) ... [2018-10-24 12:37:54,808 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:37:54" (1/1) ... [2018-10-24 12:37:54,811 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:37:54" (1/1) ... [2018-10-24 12:37:54,818 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:37:54" (1/1) ... [2018-10-24 12:37:54,819 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:37:54" (1/1) ... [2018-10-24 12:37:54,820 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:37:54,821 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:37:54,821 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:37:54,821 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:37:54,823 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:37:54" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-24 12:37:54,881 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:37:54,882 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:37:54,882 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:37:54,882 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:37:54,882 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:37:54,882 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:37:54,883 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:37:54,883 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:37:55,109 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:37:55,109 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:37:55 BoogieIcfgContainer [2018-10-24 12:37:55,110 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:37:55,110 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:37:55,111 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:37:55,114 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:37:55,114 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:37:54" (1/3) ... [2018-10-24 12:37:55,115 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3deebe03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:37:55, skipping insertion in model container [2018-10-24 12:37:55,115 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:37:54" (2/3) ... [2018-10-24 12:37:55,115 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3deebe03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:37:55, skipping insertion in model container [2018-10-24 12:37:55,116 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:37:55" (3/3) ... [2018-10-24 12:37:55,117 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_2_true-unreach-call_true-termination.i [2018-10-24 12:37:55,127 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:37:55,135 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:37:55,160 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:37:55,192 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:37:55,193 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:37:55,193 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:37:55,193 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:37:55,193 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:37:55,193 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:37:55,193 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:37:55,194 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:37:55,214 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-10-24 12:37:55,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-24 12:37:55,220 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:55,223 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:55,226 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:55,231 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:55,231 INFO L82 PathProgramCache]: Analyzing trace with hash 563245249, now seen corresponding path program 1 times [2018-10-24 12:37:55,234 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:55,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:55,284 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:55,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:55,285 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:55,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:55,338 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:55,340 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:37:55,340 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:37:55,340 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:37:55,344 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:37:55,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:37:55,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:37:55,359 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2018-10-24 12:37:55,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:55,379 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2018-10-24 12:37:55,380 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:37:55,381 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-24 12:37:55,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:55,389 INFO L225 Difference]: With dead ends: 32 [2018-10-24 12:37:55,390 INFO L226 Difference]: Without dead ends: 13 [2018-10-24 12:37:55,393 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:37:55,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-24 12:37:55,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-24 12:37:55,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-24 12:37:55,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-10-24 12:37:55,429 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-10-24 12:37:55,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:55,430 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-10-24 12:37:55,430 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:37:55,430 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-10-24 12:37:55,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-24 12:37:55,431 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:55,431 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:55,431 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:55,432 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:55,432 INFO L82 PathProgramCache]: Analyzing trace with hash -496423, now seen corresponding path program 1 times [2018-10-24 12:37:55,432 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:55,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:55,433 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:55,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:55,434 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:55,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:55,534 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:55,534 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:37:55,535 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:37:55,535 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:37:55,538 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:37:55,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:37:55,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:37:55,539 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 3 states. [2018-10-24 12:37:55,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:55,715 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-24 12:37:55,716 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:37:55,716 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-24 12:37:55,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:55,717 INFO L225 Difference]: With dead ends: 21 [2018-10-24 12:37:55,717 INFO L226 Difference]: Without dead ends: 16 [2018-10-24 12:37:55,719 INFO L605 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 [2018-10-24 12:37:55,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-24 12:37:55,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-10-24 12:37:55,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-24 12:37:55,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-24 12:37:55,724 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2018-10-24 12:37:55,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:55,726 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-24 12:37:55,726 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:37:55,726 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-24 12:37:55,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-24 12:37:55,727 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:55,727 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:55,727 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:55,728 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:55,729 INFO L82 PathProgramCache]: Analyzing trace with hash -1177044387, now seen corresponding path program 1 times [2018-10-24 12:37:55,729 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:55,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:55,730 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:55,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:55,730 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:55,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:55,812 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:55,812 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:55,812 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:55,813 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-24 12:37:55,816 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [11], [13], [15], [22], [25], [27], [33], [34], [35], [37] [2018-10-24 12:37:55,847 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:37:55,848 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:37:55,967 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:37:55,968 INFO L272 AbstractInterpreter]: Visited 13 different actions 21 times. Merged at 3 different actions 6 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-10-24 12:37:55,978 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:55,979 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:37:55,979 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:55,980 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:56,002 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:56,002 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:37:56,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:56,043 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:56,064 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:56,064 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:56,142 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:56,164 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:56,165 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-24 12:37:56,165 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:56,165 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 12:37:56,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 12:37:56,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:37:56,166 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 4 states. [2018-10-24 12:37:56,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:56,217 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-24 12:37:56,217 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:37:56,217 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-24 12:37:56,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:56,220 INFO L225 Difference]: With dead ends: 24 [2018-10-24 12:37:56,220 INFO L226 Difference]: Without dead ends: 19 [2018-10-24 12:37:56,221 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:37:56,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-24 12:37:56,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2018-10-24 12:37:56,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 12:37:56,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-24 12:37:56,226 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 14 [2018-10-24 12:37:56,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:56,227 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-24 12:37:56,227 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 12:37:56,227 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-24 12:37:56,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 12:37:56,228 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:56,228 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:56,228 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:56,228 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:56,229 INFO L82 PathProgramCache]: Analyzing trace with hash -489337255, now seen corresponding path program 2 times [2018-10-24 12:37:56,229 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:56,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:56,230 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:56,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:56,230 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:56,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:56,329 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:56,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:56,330 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:56,330 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:56,330 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:56,330 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:56,331 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:56,339 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:37:56,339 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:37:56,358 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:37:56,358 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:56,360 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:56,366 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:56,367 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:56,537 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:56,568 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:56,568 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-24 12:37:56,568 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:56,569 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:37:56,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:37:56,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:37:56,570 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 5 states. [2018-10-24 12:37:56,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:56,740 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-24 12:37:56,741 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:37:56,741 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-10-24 12:37:56,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:56,742 INFO L225 Difference]: With dead ends: 27 [2018-10-24 12:37:56,742 INFO L226 Difference]: Without dead ends: 22 [2018-10-24 12:37:56,743 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:37:56,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-24 12:37:56,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-10-24 12:37:56,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-24 12:37:56,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-10-24 12:37:56,748 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 17 [2018-10-24 12:37:56,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:56,748 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-10-24 12:37:56,749 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:37:56,749 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-10-24 12:37:56,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-24 12:37:56,750 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:56,750 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:56,750 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:56,751 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:56,751 INFO L82 PathProgramCache]: Analyzing trace with hash -169763, now seen corresponding path program 3 times [2018-10-24 12:37:56,751 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:56,752 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:56,752 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:56,752 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:56,753 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:56,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:56,854 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:56,855 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:56,855 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:56,856 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:56,856 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:56,856 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:56,856 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:56,866 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:37:56,866 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:37:56,877 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:37:56,877 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:56,880 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:56,887 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:56,888 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:57,024 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:57,045 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:57,045 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-24 12:37:57,045 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:57,046 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:37:57,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:37:57,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:37:57,047 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 6 states. [2018-10-24 12:37:57,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:57,084 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-24 12:37:57,087 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:37:57,087 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-24 12:37:57,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:57,089 INFO L225 Difference]: With dead ends: 30 [2018-10-24 12:37:57,089 INFO L226 Difference]: Without dead ends: 25 [2018-10-24 12:37:57,089 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:37:57,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-24 12:37:57,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2018-10-24 12:37:57,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-24 12:37:57,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-24 12:37:57,094 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 20 [2018-10-24 12:37:57,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:57,095 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-24 12:37:57,095 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:37:57,095 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-24 12:37:57,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-24 12:37:57,096 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:57,096 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:57,097 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:57,097 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:57,097 INFO L82 PathProgramCache]: Analyzing trace with hash -35450919, now seen corresponding path program 4 times [2018-10-24 12:37:57,097 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:57,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:57,098 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:57,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:57,098 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:57,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:57,266 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:57,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:57,267 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:57,267 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:57,267 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:57,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:57,267 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:57,282 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:57,283 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:37:57,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:57,305 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:57,312 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:57,312 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:57,437 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:57,458 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:57,458 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-24 12:37:57,458 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:57,459 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:37:57,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:37:57,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:37:57,459 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 7 states. [2018-10-24 12:37:57,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:57,601 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-24 12:37:57,602 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:37:57,602 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-10-24 12:37:57,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:57,604 INFO L225 Difference]: With dead ends: 33 [2018-10-24 12:37:57,604 INFO L226 Difference]: Without dead ends: 28 [2018-10-24 12:37:57,605 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:37:57,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-24 12:37:57,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2018-10-24 12:37:57,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-24 12:37:57,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-10-24 12:37:57,609 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 23 [2018-10-24 12:37:57,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:57,610 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-10-24 12:37:57,610 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:37:57,610 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-10-24 12:37:57,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-24 12:37:57,611 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:57,611 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:57,612 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:57,612 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:57,612 INFO L82 PathProgramCache]: Analyzing trace with hash 1170618205, now seen corresponding path program 5 times [2018-10-24 12:37:57,612 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:57,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:57,613 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:57,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:57,613 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:57,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:57,717 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:57,717 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:57,717 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:57,718 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:57,718 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:57,718 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:57,718 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:57,725 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:37:57,726 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:37:57,737 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:37:57,737 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:57,740 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:57,750 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:57,750 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:58,148 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:58,176 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:58,177 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-24 12:37:58,177 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:58,177 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:37:58,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:37:58,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:37:58,179 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 8 states. [2018-10-24 12:37:58,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:58,223 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-24 12:37:58,224 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:37:58,224 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-10-24 12:37:58,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:58,225 INFO L225 Difference]: With dead ends: 36 [2018-10-24 12:37:58,225 INFO L226 Difference]: Without dead ends: 31 [2018-10-24 12:37:58,226 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:37:58,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-24 12:37:58,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2018-10-24 12:37:58,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-24 12:37:58,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-24 12:37:58,231 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 26 [2018-10-24 12:37:58,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:58,232 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-24 12:37:58,232 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:37:58,232 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-24 12:37:58,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-24 12:37:58,233 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:58,233 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:58,233 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:58,234 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:58,234 INFO L82 PathProgramCache]: Analyzing trace with hash -520507047, now seen corresponding path program 6 times [2018-10-24 12:37:58,234 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:58,235 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:58,235 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:58,235 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:58,235 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:58,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:58,387 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:58,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:58,387 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:58,387 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:58,387 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:58,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:58,388 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:58,397 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:37:58,397 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:37:58,406 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:37:58,406 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:58,409 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:58,417 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:58,418 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:58,627 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:58,650 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:58,651 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-24 12:37:58,651 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:58,651 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:37:58,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:37:58,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:37:58,652 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 9 states. [2018-10-24 12:37:58,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:58,731 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-24 12:37:58,735 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:37:58,735 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-10-24 12:37:58,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:58,736 INFO L225 Difference]: With dead ends: 39 [2018-10-24 12:37:58,736 INFO L226 Difference]: Without dead ends: 34 [2018-10-24 12:37:58,736 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:37:58,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-24 12:37:58,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-10-24 12:37:58,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-24 12:37:58,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-24 12:37:58,741 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 29 [2018-10-24 12:37:58,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:58,742 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-24 12:37:58,742 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:37:58,742 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-24 12:37:58,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-24 12:37:58,743 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:58,743 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:58,744 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:58,744 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:58,744 INFO L82 PathProgramCache]: Analyzing trace with hash -866507299, now seen corresponding path program 7 times [2018-10-24 12:37:58,744 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:58,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:58,745 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:58,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:58,746 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:58,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:58,908 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:58,908 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:58,908 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:58,908 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:58,908 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:58,908 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:58,909 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:58,916 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:58,916 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:37:58,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:58,931 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:58,940 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:58,941 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:59,134 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:59,155 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:59,155 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-24 12:37:59,155 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:59,156 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:37:59,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:37:59,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:37:59,157 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 10 states. [2018-10-24 12:37:59,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:59,202 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-24 12:37:59,204 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:37:59,204 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-24 12:37:59,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:59,206 INFO L225 Difference]: With dead ends: 42 [2018-10-24 12:37:59,206 INFO L226 Difference]: Without dead ends: 37 [2018-10-24 12:37:59,207 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:37:59,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-24 12:37:59,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2018-10-24 12:37:59,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-24 12:37:59,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-24 12:37:59,211 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 32 [2018-10-24 12:37:59,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:59,212 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-24 12:37:59,212 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:37:59,212 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-24 12:37:59,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-24 12:37:59,213 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:59,213 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:59,214 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:59,214 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:59,214 INFO L82 PathProgramCache]: Analyzing trace with hash -638504231, now seen corresponding path program 8 times [2018-10-24 12:37:59,214 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:59,215 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:59,215 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:59,215 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:59,215 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:59,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:59,419 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:59,420 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:59,420 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:59,420 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:59,420 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:59,421 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:59,421 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:59,430 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:37:59,430 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:37:59,443 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:37:59,443 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:59,445 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:59,454 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:59,455 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:59,830 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:37:59,851 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:59,851 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-24 12:37:59,851 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:59,851 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:37:59,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:37:59,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:37:59,852 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 11 states. [2018-10-24 12:37:59,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:59,999 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-24 12:38:00,002 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:38:00,002 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-10-24 12:38:00,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:00,003 INFO L225 Difference]: With dead ends: 45 [2018-10-24 12:38:00,003 INFO L226 Difference]: Without dead ends: 40 [2018-10-24 12:38:00,004 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:38:00,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-24 12:38:00,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2018-10-24 12:38:00,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-24 12:38:00,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-10-24 12:38:00,009 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 35 [2018-10-24 12:38:00,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:00,010 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-10-24 12:38:00,010 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:38:00,010 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-10-24 12:38:00,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-24 12:38:00,011 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:00,011 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:00,011 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:00,012 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:00,012 INFO L82 PathProgramCache]: Analyzing trace with hash 1457599581, now seen corresponding path program 9 times [2018-10-24 12:38:00,012 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:00,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:00,013 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:00,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:00,013 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:00,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:00,171 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:00,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:00,171 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:00,171 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:00,171 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:00,172 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:00,172 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:00,180 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:00,180 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:00,190 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:00,190 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:00,192 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:00,202 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:00,203 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:00,460 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:00,481 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:00,481 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-24 12:38:00,482 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:00,482 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:38:00,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:38:00,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:38:00,483 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 12 states. [2018-10-24 12:38:00,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:00,524 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-24 12:38:00,525 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:38:00,525 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-10-24 12:38:00,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:00,527 INFO L225 Difference]: With dead ends: 48 [2018-10-24 12:38:00,527 INFO L226 Difference]: Without dead ends: 43 [2018-10-24 12:38:00,528 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:38:00,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-24 12:38:00,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2018-10-24 12:38:00,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-24 12:38:00,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-24 12:38:00,533 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 38 [2018-10-24 12:38:00,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:00,534 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-24 12:38:00,534 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:38:00,534 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-24 12:38:00,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-24 12:38:00,535 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:00,535 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:00,535 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:00,535 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:00,536 INFO L82 PathProgramCache]: Analyzing trace with hash 1956746329, now seen corresponding path program 10 times [2018-10-24 12:38:00,536 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:00,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:00,537 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:00,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:00,537 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:00,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:00,697 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:00,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:00,698 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:00,698 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:00,698 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:00,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:00,698 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:00,706 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:00,706 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:00,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:00,718 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:00,729 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:00,730 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:01,174 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:01,196 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:01,196 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-24 12:38:01,196 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:01,196 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:38:01,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:38:01,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:38:01,197 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 13 states. [2018-10-24 12:38:01,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:01,249 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-24 12:38:01,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:38:01,259 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-10-24 12:38:01,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:01,260 INFO L225 Difference]: With dead ends: 51 [2018-10-24 12:38:01,260 INFO L226 Difference]: Without dead ends: 46 [2018-10-24 12:38:01,261 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:38:01,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-24 12:38:01,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2018-10-24 12:38:01,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-24 12:38:01,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-10-24 12:38:01,271 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 41 [2018-10-24 12:38:01,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:01,271 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-10-24 12:38:01,271 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:38:01,271 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-10-24 12:38:01,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-24 12:38:01,272 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:01,272 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:01,272 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:01,272 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:01,273 INFO L82 PathProgramCache]: Analyzing trace with hash -1434230051, now seen corresponding path program 11 times [2018-10-24 12:38:01,275 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:01,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:01,276 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:01,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:01,276 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:01,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:01,582 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:01,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:01,583 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:01,583 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:01,583 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:01,583 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:01,583 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:01,590 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:01,591 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:01,607 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:38:01,608 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:01,610 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:01,621 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:01,622 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:01,916 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:01,938 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:01,939 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-24 12:38:01,939 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:01,939 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:38:01,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:38:01,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:38:01,940 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 14 states. [2018-10-24 12:38:02,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:02,028 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-24 12:38:02,029 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:38:02,029 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-10-24 12:38:02,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:02,030 INFO L225 Difference]: With dead ends: 54 [2018-10-24 12:38:02,030 INFO L226 Difference]: Without dead ends: 49 [2018-10-24 12:38:02,031 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:38:02,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-24 12:38:02,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2018-10-24 12:38:02,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-24 12:38:02,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-24 12:38:02,038 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 44 [2018-10-24 12:38:02,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:02,039 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-24 12:38:02,039 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:38:02,039 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-24 12:38:02,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-24 12:38:02,040 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:02,040 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:02,041 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:02,041 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:02,041 INFO L82 PathProgramCache]: Analyzing trace with hash -85797415, now seen corresponding path program 12 times [2018-10-24 12:38:02,041 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:02,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:02,042 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:02,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:02,042 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:02,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:02,223 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:02,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:02,226 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:02,226 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:02,226 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:02,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:02,226 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:02,239 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:02,239 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:02,259 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:02,259 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:02,264 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:02,282 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:02,283 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:02,580 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:02,601 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:02,601 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-24 12:38:02,601 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:02,602 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:38:02,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:38:02,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:38:02,603 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 15 states. [2018-10-24 12:38:02,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:02,656 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-24 12:38:02,657 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:38:02,657 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-10-24 12:38:02,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:02,658 INFO L225 Difference]: With dead ends: 57 [2018-10-24 12:38:02,658 INFO L226 Difference]: Without dead ends: 52 [2018-10-24 12:38:02,659 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:38:02,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-24 12:38:02,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2018-10-24 12:38:02,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-24 12:38:02,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-10-24 12:38:02,663 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 47 [2018-10-24 12:38:02,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:02,664 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-10-24 12:38:02,664 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:38:02,664 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-10-24 12:38:02,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-24 12:38:02,665 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:02,665 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:02,665 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:02,665 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:02,665 INFO L82 PathProgramCache]: Analyzing trace with hash 241742173, now seen corresponding path program 13 times [2018-10-24 12:38:02,666 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:02,666 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:02,667 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:02,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:02,667 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:02,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:02,818 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:02,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:02,819 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:02,819 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:02,819 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:02,819 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:02,819 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:02,827 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:02,827 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:02,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:02,851 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:02,862 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:02,862 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:03,383 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:03,404 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:03,404 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-24 12:38:03,404 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:03,404 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:38:03,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:38:03,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:38:03,405 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 16 states. [2018-10-24 12:38:03,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:03,468 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-24 12:38:03,469 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:38:03,469 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-10-24 12:38:03,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:03,470 INFO L225 Difference]: With dead ends: 60 [2018-10-24 12:38:03,471 INFO L226 Difference]: Without dead ends: 55 [2018-10-24 12:38:03,472 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:38:03,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-24 12:38:03,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2018-10-24 12:38:03,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-24 12:38:03,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-24 12:38:03,478 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 50 [2018-10-24 12:38:03,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:03,478 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-24 12:38:03,478 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:38:03,478 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-24 12:38:03,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-24 12:38:03,479 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:03,480 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:03,480 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:03,480 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:03,480 INFO L82 PathProgramCache]: Analyzing trace with hash -192088231, now seen corresponding path program 14 times [2018-10-24 12:38:03,481 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:03,481 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:03,481 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:03,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:03,482 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:03,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:03,716 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:03,717 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:03,717 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:03,717 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:03,717 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:03,717 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:03,717 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:03,724 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:03,725 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:03,741 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-24 12:38:03,741 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:03,744 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:03,754 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:03,754 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:04,232 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:04,253 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:04,253 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-24 12:38:04,253 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:04,253 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:38:04,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:38:04,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:38:04,254 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 17 states. [2018-10-24 12:38:04,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:04,343 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-24 12:38:04,344 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:38:04,344 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-10-24 12:38:04,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:04,345 INFO L225 Difference]: With dead ends: 63 [2018-10-24 12:38:04,345 INFO L226 Difference]: Without dead ends: 58 [2018-10-24 12:38:04,346 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:38:04,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-24 12:38:04,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2018-10-24 12:38:04,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-24 12:38:04,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-10-24 12:38:04,352 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 53 [2018-10-24 12:38:04,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:04,353 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-10-24 12:38:04,353 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:38:04,353 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-10-24 12:38:04,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-24 12:38:04,354 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:04,354 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:04,354 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:04,355 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:04,355 INFO L82 PathProgramCache]: Analyzing trace with hash -877060131, now seen corresponding path program 15 times [2018-10-24 12:38:04,355 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:04,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:04,356 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:04,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:04,356 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:04,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:04,573 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:04,574 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:04,574 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:04,574 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:04,574 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:04,574 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:04,574 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:04,584 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:04,584 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:04,597 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:04,597 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:04,599 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:04,609 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:04,609 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:05,455 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:05,479 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:05,479 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-24 12:38:05,480 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:05,480 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:38:05,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:38:05,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:38:05,481 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 18 states. [2018-10-24 12:38:05,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:05,535 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-24 12:38:05,535 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:38:05,535 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-10-24 12:38:05,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:05,536 INFO L225 Difference]: With dead ends: 66 [2018-10-24 12:38:05,536 INFO L226 Difference]: Without dead ends: 61 [2018-10-24 12:38:05,538 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:38:05,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-24 12:38:05,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2018-10-24 12:38:05,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-24 12:38:05,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-10-24 12:38:05,544 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 56 [2018-10-24 12:38:05,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:05,544 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-10-24 12:38:05,544 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:38:05,545 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-10-24 12:38:05,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:38:05,546 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:05,546 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:05,546 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:05,546 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:05,546 INFO L82 PathProgramCache]: Analyzing trace with hash -1485309735, now seen corresponding path program 16 times [2018-10-24 12:38:05,546 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:05,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:05,547 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:05,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:05,547 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:05,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:06,288 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:06,288 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:06,288 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:06,288 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:06,288 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:06,288 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:06,288 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:06,296 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:06,296 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:06,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:06,317 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:06,333 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:06,333 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:07,221 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:07,242 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:07,242 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-24 12:38:07,242 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:07,242 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:38:07,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:38:07,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:38:07,243 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 19 states. [2018-10-24 12:38:07,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:07,299 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-24 12:38:07,302 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:38:07,302 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-10-24 12:38:07,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:07,303 INFO L225 Difference]: With dead ends: 69 [2018-10-24 12:38:07,303 INFO L226 Difference]: Without dead ends: 64 [2018-10-24 12:38:07,304 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:38:07,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-24 12:38:07,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2018-10-24 12:38:07,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-24 12:38:07,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-10-24 12:38:07,314 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 59 [2018-10-24 12:38:07,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:07,315 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-10-24 12:38:07,315 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:38:07,315 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-10-24 12:38:07,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-24 12:38:07,318 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:07,318 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:07,318 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:07,319 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:07,319 INFO L82 PathProgramCache]: Analyzing trace with hash -1382240675, now seen corresponding path program 17 times [2018-10-24 12:38:07,319 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:07,320 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:07,320 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:07,320 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:07,320 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:07,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:07,577 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:07,578 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:07,578 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:07,578 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:07,578 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:07,578 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:07,578 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:07,594 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:07,594 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:07,626 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-24 12:38:07,627 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:07,628 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:07,642 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:07,642 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:08,668 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:08,689 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:08,690 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-24 12:38:08,690 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:08,690 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:38:08,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:38:08,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:38:08,691 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 20 states. [2018-10-24 12:38:08,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:08,888 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-10-24 12:38:08,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:38:08,888 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-10-24 12:38:08,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:08,889 INFO L225 Difference]: With dead ends: 72 [2018-10-24 12:38:08,889 INFO L226 Difference]: Without dead ends: 67 [2018-10-24 12:38:08,890 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:38:08,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-24 12:38:08,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2018-10-24 12:38:08,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-24 12:38:08,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-10-24 12:38:08,893 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 62 [2018-10-24 12:38:08,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:08,893 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-10-24 12:38:08,894 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:38:08,894 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-10-24 12:38:08,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-24 12:38:08,895 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:08,895 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:08,895 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:08,895 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:08,895 INFO L82 PathProgramCache]: Analyzing trace with hash -1753490855, now seen corresponding path program 18 times [2018-10-24 12:38:08,895 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:08,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:08,896 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:08,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:08,897 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:08,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:09,630 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:09,630 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:09,630 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:09,630 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:09,630 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:09,630 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:09,630 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:09,643 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:09,643 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:09,655 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:09,655 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:09,658 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:09,670 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:09,670 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:10,437 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:10,457 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:10,458 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-24 12:38:10,458 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:10,458 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:38:10,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:38:10,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:38:10,459 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 21 states. [2018-10-24 12:38:10,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:10,535 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-24 12:38:10,535 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:38:10,535 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-10-24 12:38:10,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:10,536 INFO L225 Difference]: With dead ends: 75 [2018-10-24 12:38:10,536 INFO L226 Difference]: Without dead ends: 70 [2018-10-24 12:38:10,537 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:38:10,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-24 12:38:10,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2018-10-24 12:38:10,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-24 12:38:10,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-10-24 12:38:10,541 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 65 [2018-10-24 12:38:10,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:10,541 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-10-24 12:38:10,541 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:38:10,541 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-10-24 12:38:10,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-24 12:38:10,542 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:10,542 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:10,543 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:10,543 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:10,543 INFO L82 PathProgramCache]: Analyzing trace with hash -2126816035, now seen corresponding path program 19 times [2018-10-24 12:38:10,543 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:10,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:10,544 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:10,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:10,544 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:10,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:10,792 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:10,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:10,792 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:10,792 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:10,792 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:10,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:10,793 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:10,801 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:10,801 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:10,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:10,818 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:10,829 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:10,830 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:11,411 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:11,431 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:11,432 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-24 12:38:11,432 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:11,432 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:38:11,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:38:11,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:38:11,433 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 22 states. [2018-10-24 12:38:11,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:11,525 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2018-10-24 12:38:11,525 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:38:11,525 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-10-24 12:38:11,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:11,526 INFO L225 Difference]: With dead ends: 78 [2018-10-24 12:38:11,526 INFO L226 Difference]: Without dead ends: 73 [2018-10-24 12:38:11,528 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:38:11,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-10-24 12:38:11,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2018-10-24 12:38:11,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-24 12:38:11,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2018-10-24 12:38:11,532 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 68 [2018-10-24 12:38:11,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:11,532 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2018-10-24 12:38:11,532 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:38:11,532 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2018-10-24 12:38:11,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-24 12:38:11,533 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:11,533 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:11,533 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:11,534 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:11,534 INFO L82 PathProgramCache]: Analyzing trace with hash 108043225, now seen corresponding path program 20 times [2018-10-24 12:38:11,534 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:11,534 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:11,535 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:11,535 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:11,535 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:11,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:11,849 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:11,849 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:11,849 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:11,850 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:11,850 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:11,850 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:11,850 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:11,858 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:11,858 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:11,878 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-24 12:38:11,878 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:11,880 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:11,890 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:11,890 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:12,482 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:12,502 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:12,502 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-24 12:38:12,502 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:12,503 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:38:12,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:38:12,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:38:12,504 INFO L87 Difference]: Start difference. First operand 72 states and 72 transitions. Second operand 23 states. [2018-10-24 12:38:12,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:12,569 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-10-24 12:38:12,573 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:38:12,573 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 71 [2018-10-24 12:38:12,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:12,574 INFO L225 Difference]: With dead ends: 81 [2018-10-24 12:38:12,574 INFO L226 Difference]: Without dead ends: 76 [2018-10-24 12:38:12,575 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:38:12,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-10-24 12:38:12,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2018-10-24 12:38:12,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-24 12:38:12,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-10-24 12:38:12,579 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 71 [2018-10-24 12:38:12,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:12,579 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-10-24 12:38:12,579 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:38:12,579 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-10-24 12:38:12,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-24 12:38:12,580 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:12,580 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:12,581 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:12,581 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:12,581 INFO L82 PathProgramCache]: Analyzing trace with hash -1782764707, now seen corresponding path program 21 times [2018-10-24 12:38:12,581 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:12,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:12,582 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:12,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:12,582 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:12,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:13,615 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:13,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:13,615 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:13,616 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:13,616 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:13,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:13,616 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:13,624 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:13,624 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:13,639 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:13,639 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:13,642 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:13,654 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:13,654 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:14,472 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:14,492 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:14,492 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-10-24 12:38:14,493 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:14,493 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:38:14,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:38:14,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:38:14,494 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 24 states. [2018-10-24 12:38:14,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:14,725 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2018-10-24 12:38:14,725 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 12:38:14,726 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 74 [2018-10-24 12:38:14,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:14,727 INFO L225 Difference]: With dead ends: 84 [2018-10-24 12:38:14,727 INFO L226 Difference]: Without dead ends: 79 [2018-10-24 12:38:14,729 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:38:14,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-24 12:38:14,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2018-10-24 12:38:14,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-24 12:38:14,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 78 transitions. [2018-10-24 12:38:14,740 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 78 transitions. Word has length 74 [2018-10-24 12:38:14,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:14,740 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 78 transitions. [2018-10-24 12:38:14,740 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:38:14,740 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 78 transitions. [2018-10-24 12:38:14,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-24 12:38:14,741 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:14,741 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:14,741 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:14,742 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:14,742 INFO L82 PathProgramCache]: Analyzing trace with hash 1949187417, now seen corresponding path program 22 times [2018-10-24 12:38:14,742 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:14,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:14,743 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:14,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:14,743 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:14,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:15,301 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:15,301 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:15,301 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:15,301 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:15,301 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:15,301 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:15,301 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:15,310 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:15,310 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:15,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:15,326 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:15,340 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:15,341 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:15,948 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:15,968 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:15,969 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-10-24 12:38:15,969 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:15,969 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:38:15,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:38:15,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:38:15,970 INFO L87 Difference]: Start difference. First operand 78 states and 78 transitions. Second operand 25 states. [2018-10-24 12:38:16,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:16,064 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2018-10-24 12:38:16,071 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:38:16,071 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 77 [2018-10-24 12:38:16,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:16,072 INFO L225 Difference]: With dead ends: 87 [2018-10-24 12:38:16,072 INFO L226 Difference]: Without dead ends: 82 [2018-10-24 12:38:16,073 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:38:16,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-10-24 12:38:16,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2018-10-24 12:38:16,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-10-24 12:38:16,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2018-10-24 12:38:16,076 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 77 [2018-10-24 12:38:16,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:16,076 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2018-10-24 12:38:16,076 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:38:16,077 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2018-10-24 12:38:16,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-10-24 12:38:16,077 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:16,077 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:16,078 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:16,078 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:16,078 INFO L82 PathProgramCache]: Analyzing trace with hash 1011489245, now seen corresponding path program 23 times [2018-10-24 12:38:16,078 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:16,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:16,079 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:16,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:16,079 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:16,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:16,397 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:16,397 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:16,397 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:16,397 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:16,397 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:16,397 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:16,397 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:16,404 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:16,404 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:16,426 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-24 12:38:16,426 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:16,427 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:16,442 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:16,442 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:17,131 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:17,151 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:17,151 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2018-10-24 12:38:17,151 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:17,152 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:38:17,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:38:17,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:38:17,153 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 26 states. [2018-10-24 12:38:17,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:17,237 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2018-10-24 12:38:17,237 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:38:17,238 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 80 [2018-10-24 12:38:17,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:17,239 INFO L225 Difference]: With dead ends: 90 [2018-10-24 12:38:17,239 INFO L226 Difference]: Without dead ends: 85 [2018-10-24 12:38:17,240 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:38:17,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-24 12:38:17,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 84. [2018-10-24 12:38:17,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-24 12:38:17,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 84 transitions. [2018-10-24 12:38:17,244 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 84 transitions. Word has length 80 [2018-10-24 12:38:17,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:17,245 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 84 transitions. [2018-10-24 12:38:17,245 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:38:17,245 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 84 transitions. [2018-10-24 12:38:17,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-24 12:38:17,246 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:17,246 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:17,246 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:17,246 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:17,246 INFO L82 PathProgramCache]: Analyzing trace with hash 512540377, now seen corresponding path program 24 times [2018-10-24 12:38:17,246 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:17,247 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:17,247 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:17,247 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:17,247 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:17,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:17,644 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:17,644 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:17,645 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:17,645 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:17,645 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:17,645 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:17,645 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:17,652 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:17,653 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:17,696 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:17,696 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:17,698 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:17,713 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:17,713 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:18,452 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:18,472 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:18,473 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2018-10-24 12:38:18,473 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:18,473 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:38:18,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:38:18,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-24 12:38:18,474 INFO L87 Difference]: Start difference. First operand 84 states and 84 transitions. Second operand 27 states. [2018-10-24 12:38:18,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:18,566 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2018-10-24 12:38:18,567 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:38:18,567 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 83 [2018-10-24 12:38:18,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:18,568 INFO L225 Difference]: With dead ends: 93 [2018-10-24 12:38:18,568 INFO L226 Difference]: Without dead ends: 88 [2018-10-24 12:38:18,569 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-24 12:38:18,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-10-24 12:38:18,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2018-10-24 12:38:18,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-10-24 12:38:18,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2018-10-24 12:38:18,572 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 83 [2018-10-24 12:38:18,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:18,573 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2018-10-24 12:38:18,573 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:38:18,573 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2018-10-24 12:38:18,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-10-24 12:38:18,574 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:18,574 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:18,574 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:18,574 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:18,574 INFO L82 PathProgramCache]: Analyzing trace with hash 1208625245, now seen corresponding path program 25 times [2018-10-24 12:38:18,574 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:18,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:18,575 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:18,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:18,575 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:18,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:19,293 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:19,293 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:19,293 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:19,293 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:19,293 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:19,293 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:19,293 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:19,301 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:19,301 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:19,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:19,318 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:19,333 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:19,333 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:21,006 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:21,027 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:21,027 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 54 [2018-10-24 12:38:21,028 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:21,028 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:38:21,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:38:21,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-10-24 12:38:21,030 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 28 states. [2018-10-24 12:38:21,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:21,115 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2018-10-24 12:38:21,115 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:38:21,115 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 86 [2018-10-24 12:38:21,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:21,117 INFO L225 Difference]: With dead ends: 96 [2018-10-24 12:38:21,117 INFO L226 Difference]: Without dead ends: 91 [2018-10-24 12:38:21,119 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-10-24 12:38:21,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-10-24 12:38:21,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2018-10-24 12:38:21,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-24 12:38:21,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 90 transitions. [2018-10-24 12:38:21,122 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 90 transitions. Word has length 86 [2018-10-24 12:38:21,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:21,122 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 90 transitions. [2018-10-24 12:38:21,123 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:38:21,123 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 90 transitions. [2018-10-24 12:38:21,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:38:21,123 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:21,123 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:21,124 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:21,124 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:21,124 INFO L82 PathProgramCache]: Analyzing trace with hash -2124144551, now seen corresponding path program 26 times [2018-10-24 12:38:21,124 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:21,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:21,125 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:21,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:21,125 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:21,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:21,541 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:21,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:21,541 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:21,542 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:21,542 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:21,542 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:21,542 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:21,550 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:21,550 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:21,573 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-24 12:38:21,574 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:21,575 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:21,591 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:21,591 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:22,448 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:22,468 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:22,468 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-10-24 12:38:22,468 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:22,469 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:38:22,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:38:22,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:38:22,470 INFO L87 Difference]: Start difference. First operand 90 states and 90 transitions. Second operand 29 states. [2018-10-24 12:38:22,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:22,550 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2018-10-24 12:38:22,551 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:38:22,551 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 89 [2018-10-24 12:38:22,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:22,552 INFO L225 Difference]: With dead ends: 99 [2018-10-24 12:38:22,552 INFO L226 Difference]: Without dead ends: 94 [2018-10-24 12:38:22,553 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:38:22,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-10-24 12:38:22,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2018-10-24 12:38:22,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-10-24 12:38:22,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2018-10-24 12:38:22,556 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 89 [2018-10-24 12:38:22,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:22,557 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2018-10-24 12:38:22,557 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:38:22,557 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2018-10-24 12:38:22,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-10-24 12:38:22,558 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:22,558 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:22,558 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:22,558 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:22,558 INFO L82 PathProgramCache]: Analyzing trace with hash -1910155555, now seen corresponding path program 27 times [2018-10-24 12:38:22,558 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:22,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:22,559 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:22,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:22,559 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:22,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:22,979 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:22,980 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:22,980 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:22,980 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:22,980 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:22,980 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:22,980 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:22,988 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:22,989 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:23,004 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:23,004 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:23,007 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:23,022 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:23,022 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:24,210 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:24,230 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:24,230 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 58 [2018-10-24 12:38:24,230 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:24,231 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:38:24,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:38:24,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1653, Invalid=1653, Unknown=0, NotChecked=0, Total=3306 [2018-10-24 12:38:24,232 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 30 states. [2018-10-24 12:38:24,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:24,330 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2018-10-24 12:38:24,331 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-24 12:38:24,331 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 92 [2018-10-24 12:38:24,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:24,332 INFO L225 Difference]: With dead ends: 102 [2018-10-24 12:38:24,332 INFO L226 Difference]: Without dead ends: 97 [2018-10-24 12:38:24,333 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1653, Invalid=1653, Unknown=0, NotChecked=0, Total=3306 [2018-10-24 12:38:24,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-10-24 12:38:24,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2018-10-24 12:38:24,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-10-24 12:38:24,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 96 transitions. [2018-10-24 12:38:24,337 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 96 transitions. Word has length 92 [2018-10-24 12:38:24,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:24,337 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 96 transitions. [2018-10-24 12:38:24,337 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:38:24,337 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 96 transitions. [2018-10-24 12:38:24,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-24 12:38:24,338 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:24,338 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:24,338 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:24,339 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:24,339 INFO L82 PathProgramCache]: Analyzing trace with hash -695442983, now seen corresponding path program 28 times [2018-10-24 12:38:24,339 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:24,340 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:24,340 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:24,340 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:24,340 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:24,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:24,752 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:24,753 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:24,753 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:24,753 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:24,753 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:24,753 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:24,754 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:24,762 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:24,762 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:24,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:24,781 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:24,798 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:24,799 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:26,395 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:26,415 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:26,416 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 60 [2018-10-24 12:38:26,416 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:26,416 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:38:26,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:38:26,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1770, Invalid=1770, Unknown=0, NotChecked=0, Total=3540 [2018-10-24 12:38:26,417 INFO L87 Difference]: Start difference. First operand 96 states and 96 transitions. Second operand 31 states. [2018-10-24 12:38:26,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:26,581 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2018-10-24 12:38:26,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:38:26,582 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 95 [2018-10-24 12:38:26,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:26,583 INFO L225 Difference]: With dead ends: 105 [2018-10-24 12:38:26,583 INFO L226 Difference]: Without dead ends: 100 [2018-10-24 12:38:26,584 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1770, Invalid=1770, Unknown=0, NotChecked=0, Total=3540 [2018-10-24 12:38:26,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-24 12:38:26,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2018-10-24 12:38:26,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-24 12:38:26,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2018-10-24 12:38:26,588 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 95 [2018-10-24 12:38:26,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:26,588 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2018-10-24 12:38:26,588 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:38:26,588 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2018-10-24 12:38:26,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-10-24 12:38:26,589 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:26,589 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:26,589 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:26,590 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:26,590 INFO L82 PathProgramCache]: Analyzing trace with hash 1707320669, now seen corresponding path program 29 times [2018-10-24 12:38:26,590 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:26,590 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:26,590 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:26,591 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:26,591 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:26,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:27,653 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:27,654 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:27,654 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:27,654 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:27,654 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:27,654 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:27,654 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:27,662 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:27,663 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:27,691 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-24 12:38:27,691 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:27,693 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:27,710 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:27,710 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:28,806 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:28,826 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:28,827 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2018-10-24 12:38:28,827 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:28,827 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:38:28,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:38:28,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1891, Invalid=1891, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:38:28,828 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 32 states. [2018-10-24 12:38:29,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:29,083 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2018-10-24 12:38:29,083 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:38:29,083 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 98 [2018-10-24 12:38:29,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:29,084 INFO L225 Difference]: With dead ends: 108 [2018-10-24 12:38:29,085 INFO L226 Difference]: Without dead ends: 103 [2018-10-24 12:38:29,086 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1891, Invalid=1891, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:38:29,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-24 12:38:29,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2018-10-24 12:38:29,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-24 12:38:29,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 102 transitions. [2018-10-24 12:38:29,089 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 102 transitions. Word has length 98 [2018-10-24 12:38:29,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:29,089 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 102 transitions. [2018-10-24 12:38:29,089 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:38:29,089 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 102 transitions. [2018-10-24 12:38:29,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-24 12:38:29,090 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:29,090 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:29,090 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:29,091 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:29,091 INFO L82 PathProgramCache]: Analyzing trace with hash -1780645031, now seen corresponding path program 30 times [2018-10-24 12:38:29,091 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:29,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:29,092 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:29,092 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:29,092 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:29,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:29,749 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:29,749 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:29,749 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:29,749 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:29,749 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:29,749 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:29,749 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:29,756 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:29,756 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:29,774 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:29,774 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:29,777 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:29,807 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:29,808 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:31,225 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:31,244 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:31,245 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 64 [2018-10-24 12:38:31,245 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:31,245 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:38:31,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:38:31,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2016, Invalid=2016, Unknown=0, NotChecked=0, Total=4032 [2018-10-24 12:38:31,246 INFO L87 Difference]: Start difference. First operand 102 states and 102 transitions. Second operand 33 states. [2018-10-24 12:38:31,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:31,393 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2018-10-24 12:38:31,394 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-24 12:38:31,394 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 101 [2018-10-24 12:38:31,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:31,395 INFO L225 Difference]: With dead ends: 111 [2018-10-24 12:38:31,395 INFO L226 Difference]: Without dead ends: 106 [2018-10-24 12:38:31,396 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2016, Invalid=2016, Unknown=0, NotChecked=0, Total=4032 [2018-10-24 12:38:31,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-10-24 12:38:31,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2018-10-24 12:38:31,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-10-24 12:38:31,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2018-10-24 12:38:31,400 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 101 [2018-10-24 12:38:31,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:31,400 INFO L481 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2018-10-24 12:38:31,400 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:38:31,400 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2018-10-24 12:38:31,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-24 12:38:31,401 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:31,401 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:31,401 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:31,402 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:31,402 INFO L82 PathProgramCache]: Analyzing trace with hash 671945693, now seen corresponding path program 31 times [2018-10-24 12:38:31,402 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:31,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:31,403 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:31,403 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:31,403 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:31,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:31,855 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:31,855 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:31,855 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:31,855 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:31,855 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:31,855 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:31,855 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:31,864 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:31,864 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:31,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:31,885 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:31,904 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:31,905 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:33,031 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:33,051 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:33,051 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 66 [2018-10-24 12:38:33,051 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:33,052 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:38:33,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:38:33,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2145, Invalid=2145, Unknown=0, NotChecked=0, Total=4290 [2018-10-24 12:38:33,053 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 34 states. [2018-10-24 12:38:33,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:33,164 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2018-10-24 12:38:33,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:38:33,165 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 104 [2018-10-24 12:38:33,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:33,166 INFO L225 Difference]: With dead ends: 114 [2018-10-24 12:38:33,166 INFO L226 Difference]: Without dead ends: 109 [2018-10-24 12:38:33,167 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 177 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2145, Invalid=2145, Unknown=0, NotChecked=0, Total=4290 [2018-10-24 12:38:33,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-10-24 12:38:33,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 108. [2018-10-24 12:38:33,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-10-24 12:38:33,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 108 transitions. [2018-10-24 12:38:33,171 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 108 transitions. Word has length 104 [2018-10-24 12:38:33,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:33,171 INFO L481 AbstractCegarLoop]: Abstraction has 108 states and 108 transitions. [2018-10-24 12:38:33,171 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:38:33,171 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 108 transitions. [2018-10-24 12:38:33,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-10-24 12:38:33,172 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:33,172 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:33,172 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:33,172 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:33,173 INFO L82 PathProgramCache]: Analyzing trace with hash -181435175, now seen corresponding path program 32 times [2018-10-24 12:38:33,173 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:33,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:33,174 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:33,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:33,174 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:33,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:33,797 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:33,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:33,798 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:33,798 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:33,798 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:33,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:33,798 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:33,805 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:33,805 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:33,837 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-10-24 12:38:33,837 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:33,839 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:33,856 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:33,856 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:35,267 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:35,287 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:35,287 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 68 [2018-10-24 12:38:35,287 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:35,288 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 12:38:35,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 12:38:35,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2278, Invalid=2278, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:38:35,289 INFO L87 Difference]: Start difference. First operand 108 states and 108 transitions. Second operand 35 states. [2018-10-24 12:38:35,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:35,456 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2018-10-24 12:38:35,457 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:38:35,457 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 107 [2018-10-24 12:38:35,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:35,458 INFO L225 Difference]: With dead ends: 117 [2018-10-24 12:38:35,458 INFO L226 Difference]: Without dead ends: 112 [2018-10-24 12:38:35,459 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2278, Invalid=2278, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:38:35,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-10-24 12:38:35,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2018-10-24 12:38:35,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-10-24 12:38:35,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2018-10-24 12:38:35,461 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 107 [2018-10-24 12:38:35,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:35,461 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2018-10-24 12:38:35,461 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 12:38:35,462 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2018-10-24 12:38:35,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-10-24 12:38:35,462 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:35,462 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:35,462 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:35,462 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:35,463 INFO L82 PathProgramCache]: Analyzing trace with hash -1339448739, now seen corresponding path program 33 times [2018-10-24 12:38:35,463 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:35,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:35,463 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:35,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:35,463 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:35,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:36,099 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:36,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:36,099 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:36,099 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:36,099 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:36,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:36,099 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:36,106 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:36,106 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:36,125 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:36,126 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:36,127 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:36,145 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:36,146 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:37,483 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:37,503 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:37,504 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 70 [2018-10-24 12:38:37,504 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:37,504 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:38:37,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:38:37,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2415, Invalid=2415, Unknown=0, NotChecked=0, Total=4830 [2018-10-24 12:38:37,506 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 36 states. [2018-10-24 12:38:37,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:37,656 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2018-10-24 12:38:37,657 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-24 12:38:37,657 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 110 [2018-10-24 12:38:37,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:37,658 INFO L225 Difference]: With dead ends: 120 [2018-10-24 12:38:37,658 INFO L226 Difference]: Without dead ends: 115 [2018-10-24 12:38:37,659 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 187 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2415, Invalid=2415, Unknown=0, NotChecked=0, Total=4830 [2018-10-24 12:38:37,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-24 12:38:37,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 114. [2018-10-24 12:38:37,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-10-24 12:38:37,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 114 transitions. [2018-10-24 12:38:37,664 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 114 transitions. Word has length 110 [2018-10-24 12:38:37,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:37,664 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 114 transitions. [2018-10-24 12:38:37,664 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:38:37,664 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 114 transitions. [2018-10-24 12:38:37,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-10-24 12:38:37,665 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:37,665 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:37,665 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:37,666 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:37,666 INFO L82 PathProgramCache]: Analyzing trace with hash 1750754905, now seen corresponding path program 34 times [2018-10-24 12:38:37,666 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:37,666 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:37,667 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:37,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:37,667 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:37,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:38,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:38,247 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:38,247 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:38,247 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:38,247 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:38,247 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:38,247 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:38,256 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:38,256 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:38,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:38,276 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:38,293 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:38,293 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:39,636 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:39,656 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:39,656 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 72 [2018-10-24 12:38:39,657 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:39,657 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-24 12:38:39,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-24 12:38:39,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2556, Invalid=2556, Unknown=0, NotChecked=0, Total=5112 [2018-10-24 12:38:39,658 INFO L87 Difference]: Start difference. First operand 114 states and 114 transitions. Second operand 37 states. [2018-10-24 12:38:39,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:39,778 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2018-10-24 12:38:39,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-24 12:38:39,778 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 113 [2018-10-24 12:38:39,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:39,779 INFO L225 Difference]: With dead ends: 123 [2018-10-24 12:38:39,779 INFO L226 Difference]: Without dead ends: 118 [2018-10-24 12:38:39,780 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 192 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2556, Invalid=2556, Unknown=0, NotChecked=0, Total=5112 [2018-10-24 12:38:39,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-10-24 12:38:39,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2018-10-24 12:38:39,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-24 12:38:39,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2018-10-24 12:38:39,783 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 113 [2018-10-24 12:38:39,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:39,784 INFO L481 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2018-10-24 12:38:39,784 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-24 12:38:39,784 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2018-10-24 12:38:39,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-24 12:38:39,784 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:39,785 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:39,785 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:39,785 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:39,785 INFO L82 PathProgramCache]: Analyzing trace with hash -616476451, now seen corresponding path program 35 times [2018-10-24 12:38:39,785 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:39,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:39,786 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:39,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:39,786 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:39,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:40,643 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:40,644 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:40,644 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:40,644 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:40,644 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:40,644 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:40,644 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:40,652 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:40,652 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:40,723 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-10-24 12:38:40,723 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:40,725 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:40,748 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:40,748 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:42,298 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:42,318 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:42,318 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 74 [2018-10-24 12:38:42,318 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:42,318 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:38:42,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:38:42,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2701, Invalid=2701, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:38:42,319 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 38 states. [2018-10-24 12:38:42,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:42,447 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2018-10-24 12:38:42,447 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-24 12:38:42,447 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 116 [2018-10-24 12:38:42,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:42,449 INFO L225 Difference]: With dead ends: 126 [2018-10-24 12:38:42,449 INFO L226 Difference]: Without dead ends: 121 [2018-10-24 12:38:42,449 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 197 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2701, Invalid=2701, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:38:42,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-10-24 12:38:42,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 120. [2018-10-24 12:38:42,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-10-24 12:38:42,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 120 transitions. [2018-10-24 12:38:42,453 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 120 transitions. Word has length 116 [2018-10-24 12:38:42,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:42,453 INFO L481 AbstractCegarLoop]: Abstraction has 120 states and 120 transitions. [2018-10-24 12:38:42,453 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:38:42,453 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 120 transitions. [2018-10-24 12:38:42,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:38:42,457 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:42,458 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:42,458 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:42,458 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:42,458 INFO L82 PathProgramCache]: Analyzing trace with hash 557197273, now seen corresponding path program 36 times [2018-10-24 12:38:42,458 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:42,459 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:42,459 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:42,459 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:42,459 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:42,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:43,168 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:43,168 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:43,168 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:43,168 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:43,169 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:43,169 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:43,169 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:43,176 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:43,176 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:43,195 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:43,195 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:43,198 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:43,222 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:43,222 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:45,160 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:45,180 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:45,181 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 76 [2018-10-24 12:38:45,181 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:45,181 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:38:45,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:38:45,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2850, Invalid=2850, Unknown=0, NotChecked=0, Total=5700 [2018-10-24 12:38:45,182 INFO L87 Difference]: Start difference. First operand 120 states and 120 transitions. Second operand 39 states. [2018-10-24 12:38:45,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:45,332 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2018-10-24 12:38:45,333 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:38:45,333 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 119 [2018-10-24 12:38:45,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:45,334 INFO L225 Difference]: With dead ends: 129 [2018-10-24 12:38:45,334 INFO L226 Difference]: Without dead ends: 124 [2018-10-24 12:38:45,335 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 202 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2850, Invalid=2850, Unknown=0, NotChecked=0, Total=5700 [2018-10-24 12:38:45,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-24 12:38:45,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2018-10-24 12:38:45,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-10-24 12:38:45,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2018-10-24 12:38:45,338 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 119 [2018-10-24 12:38:45,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:45,338 INFO L481 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2018-10-24 12:38:45,338 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:38:45,339 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2018-10-24 12:38:45,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-10-24 12:38:45,339 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:45,339 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:45,340 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:45,340 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:45,340 INFO L82 PathProgramCache]: Analyzing trace with hash 142352221, now seen corresponding path program 37 times [2018-10-24 12:38:45,340 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:45,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:45,341 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:45,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:45,341 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:45,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:46,791 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:46,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:46,792 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:46,792 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:46,792 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:46,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:46,792 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:46,800 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:46,800 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:46,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:46,825 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:46,846 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:46,847 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:48,408 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:48,429 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:48,429 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 78 [2018-10-24 12:38:48,429 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:48,430 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-24 12:38:48,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-24 12:38:48,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3003, Invalid=3003, Unknown=0, NotChecked=0, Total=6006 [2018-10-24 12:38:48,431 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 40 states. [2018-10-24 12:38:48,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:48,559 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2018-10-24 12:38:48,559 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-24 12:38:48,559 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 122 [2018-10-24 12:38:48,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:48,561 INFO L225 Difference]: With dead ends: 132 [2018-10-24 12:38:48,561 INFO L226 Difference]: Without dead ends: 127 [2018-10-24 12:38:48,562 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 207 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=3003, Invalid=3003, Unknown=0, NotChecked=0, Total=6006 [2018-10-24 12:38:48,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-24 12:38:48,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 126. [2018-10-24 12:38:48,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-10-24 12:38:48,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 126 transitions. [2018-10-24 12:38:48,565 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 126 transitions. Word has length 122 [2018-10-24 12:38:48,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:48,566 INFO L481 AbstractCegarLoop]: Abstraction has 126 states and 126 transitions. [2018-10-24 12:38:48,566 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-24 12:38:48,566 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 126 transitions. [2018-10-24 12:38:48,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-24 12:38:48,567 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:48,567 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:48,567 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:48,567 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:48,568 INFO L82 PathProgramCache]: Analyzing trace with hash -1885681319, now seen corresponding path program 38 times [2018-10-24 12:38:48,568 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:48,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:48,568 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:48,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:48,569 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:48,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:50,334 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:50,334 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:50,334 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:50,335 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:50,335 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:50,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:50,335 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:50,342 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:50,343 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:50,403 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-10-24 12:38:50,404 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:50,406 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:50,431 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:50,432 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:52,304 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:52,323 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:52,324 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 80 [2018-10-24 12:38:52,324 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:52,324 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-24 12:38:52,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-24 12:38:52,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2018-10-24 12:38:52,325 INFO L87 Difference]: Start difference. First operand 126 states and 126 transitions. Second operand 41 states. [2018-10-24 12:38:52,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:52,453 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2018-10-24 12:38:52,454 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:38:52,454 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 125 [2018-10-24 12:38:52,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:52,455 INFO L225 Difference]: With dead ends: 135 [2018-10-24 12:38:52,456 INFO L226 Difference]: Without dead ends: 130 [2018-10-24 12:38:52,457 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 212 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2018-10-24 12:38:52,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-10-24 12:38:52,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2018-10-24 12:38:52,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-10-24 12:38:52,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2018-10-24 12:38:52,461 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 125 [2018-10-24 12:38:52,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:52,461 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2018-10-24 12:38:52,461 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-24 12:38:52,462 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2018-10-24 12:38:52,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-10-24 12:38:52,462 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:52,462 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:52,463 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:52,463 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:52,463 INFO L82 PathProgramCache]: Analyzing trace with hash -1727918627, now seen corresponding path program 39 times [2018-10-24 12:38:52,463 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:52,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:52,464 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:52,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:52,464 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:52,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:53,168 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:53,168 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:53,169 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:53,169 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:53,169 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:53,169 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:53,169 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:53,177 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:53,177 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:53,195 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:53,195 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:53,198 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:53,218 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:53,218 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:55,042 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:55,072 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:55,072 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 82 [2018-10-24 12:38:55,072 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:55,073 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:38:55,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:38:55,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3321, Invalid=3321, Unknown=0, NotChecked=0, Total=6642 [2018-10-24 12:38:55,074 INFO L87 Difference]: Start difference. First operand 129 states and 129 transitions. Second operand 42 states. [2018-10-24 12:38:55,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:55,371 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2018-10-24 12:38:55,375 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-24 12:38:55,375 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 128 [2018-10-24 12:38:55,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:55,376 INFO L225 Difference]: With dead ends: 138 [2018-10-24 12:38:55,376 INFO L226 Difference]: Without dead ends: 133 [2018-10-24 12:38:55,377 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 217 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3321, Invalid=3321, Unknown=0, NotChecked=0, Total=6642 [2018-10-24 12:38:55,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-10-24 12:38:55,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 132. [2018-10-24 12:38:55,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-10-24 12:38:55,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 132 transitions. [2018-10-24 12:38:55,381 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 132 transitions. Word has length 128 [2018-10-24 12:38:55,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:55,381 INFO L481 AbstractCegarLoop]: Abstraction has 132 states and 132 transitions. [2018-10-24 12:38:55,381 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:38:55,381 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 132 transitions. [2018-10-24 12:38:55,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-10-24 12:38:55,382 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:55,382 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:55,383 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:55,383 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:55,383 INFO L82 PathProgramCache]: Analyzing trace with hash -513783079, now seen corresponding path program 40 times [2018-10-24 12:38:55,383 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:55,384 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:55,384 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:55,384 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:55,384 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:55,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:56,901 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:56,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:56,901 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:56,901 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:56,902 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:56,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:56,902 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:56,909 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:56,909 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:56,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:56,936 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:56,958 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:56,958 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:58,868 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:58,898 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:58,898 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 84 [2018-10-24 12:38:58,899 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:58,899 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-24 12:38:58,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-24 12:38:58,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3486, Invalid=3486, Unknown=0, NotChecked=0, Total=6972 [2018-10-24 12:38:58,901 INFO L87 Difference]: Start difference. First operand 132 states and 132 transitions. Second operand 43 states. [2018-10-24 12:38:59,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:59,146 INFO L93 Difference]: Finished difference Result 141 states and 141 transitions. [2018-10-24 12:38:59,147 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:38:59,147 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 131 [2018-10-24 12:38:59,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:59,148 INFO L225 Difference]: With dead ends: 141 [2018-10-24 12:38:59,148 INFO L226 Difference]: Without dead ends: 136 [2018-10-24 12:38:59,149 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 222 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3486, Invalid=3486, Unknown=0, NotChecked=0, Total=6972 [2018-10-24 12:38:59,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-10-24 12:38:59,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2018-10-24 12:38:59,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-10-24 12:38:59,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 135 transitions. [2018-10-24 12:38:59,153 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 135 transitions. Word has length 131 [2018-10-24 12:38:59,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:59,153 INFO L481 AbstractCegarLoop]: Abstraction has 135 states and 135 transitions. [2018-10-24 12:38:59,153 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-24 12:38:59,154 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 135 transitions. [2018-10-24 12:38:59,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-24 12:38:59,154 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:59,154 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:59,155 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:59,155 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:59,155 INFO L82 PathProgramCache]: Analyzing trace with hash 1878727773, now seen corresponding path program 41 times [2018-10-24 12:38:59,155 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:59,156 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:59,156 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:59,156 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:59,156 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:59,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:59,872 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:59,872 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:59,872 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:59,872 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:59,872 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:59,872 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:59,873 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:59,881 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:59,882 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:39:00,236 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-10-24 12:39:00,237 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:00,239 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:00,260 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:00,260 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:02,195 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:02,215 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:02,215 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 86 [2018-10-24 12:39:02,215 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:02,215 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-24 12:39:02,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-24 12:39:02,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2018-10-24 12:39:02,216 INFO L87 Difference]: Start difference. First operand 135 states and 135 transitions. Second operand 44 states. [2018-10-24 12:39:02,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:02,787 INFO L93 Difference]: Finished difference Result 144 states and 144 transitions. [2018-10-24 12:39:02,789 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-24 12:39:02,789 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 134 [2018-10-24 12:39:02,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:02,790 INFO L225 Difference]: With dead ends: 144 [2018-10-24 12:39:02,790 INFO L226 Difference]: Without dead ends: 139 [2018-10-24 12:39:02,791 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 311 GetRequests, 227 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2018-10-24 12:39:02,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-24 12:39:02,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 138. [2018-10-24 12:39:02,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-10-24 12:39:02,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 138 transitions. [2018-10-24 12:39:02,795 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 138 transitions. Word has length 134 [2018-10-24 12:39:02,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:02,796 INFO L481 AbstractCegarLoop]: Abstraction has 138 states and 138 transitions. [2018-10-24 12:39:02,796 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-24 12:39:02,796 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 138 transitions. [2018-10-24 12:39:02,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-10-24 12:39:02,797 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:02,797 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:02,797 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:02,797 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:02,797 INFO L82 PathProgramCache]: Analyzing trace with hash -2107724711, now seen corresponding path program 42 times [2018-10-24 12:39:02,797 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:02,798 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:02,798 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:02,798 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:02,799 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:02,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:03,921 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:03,921 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:03,921 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:03,921 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:03,921 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:03,921 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:03,921 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:03,930 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:39:03,930 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:39:03,953 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:39:03,953 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:03,958 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:03,988 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:03,988 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:07,321 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:07,341 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:07,341 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 88 [2018-10-24 12:39:07,341 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:07,342 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:39:07,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:39:07,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3828, Invalid=3828, Unknown=0, NotChecked=0, Total=7656 [2018-10-24 12:39:07,343 INFO L87 Difference]: Start difference. First operand 138 states and 138 transitions. Second operand 45 states. [2018-10-24 12:39:07,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:07,483 INFO L93 Difference]: Finished difference Result 147 states and 147 transitions. [2018-10-24 12:39:07,483 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-24 12:39:07,484 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 137 [2018-10-24 12:39:07,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:07,485 INFO L225 Difference]: With dead ends: 147 [2018-10-24 12:39:07,485 INFO L226 Difference]: Without dead ends: 142 [2018-10-24 12:39:07,487 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 232 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=3828, Invalid=3828, Unknown=0, NotChecked=0, Total=7656 [2018-10-24 12:39:07,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-10-24 12:39:07,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 141. [2018-10-24 12:39:07,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:39:07,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 141 transitions. [2018-10-24 12:39:07,491 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 141 transitions. Word has length 137 [2018-10-24 12:39:07,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:07,492 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 141 transitions. [2018-10-24 12:39:07,492 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:39:07,492 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 141 transitions. [2018-10-24 12:39:07,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-10-24 12:39:07,493 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:07,493 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:07,493 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:07,493 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:07,494 INFO L82 PathProgramCache]: Analyzing trace with hash 1921993437, now seen corresponding path program 43 times [2018-10-24 12:39:07,494 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:07,494 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:07,495 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:07,495 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:07,495 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:07,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:08,610 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:08,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:08,610 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:08,610 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:08,611 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:08,611 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:08,611 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:08,620 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:08,620 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:39:08,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:08,646 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:08,668 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:08,669 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:10,769 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:10,790 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:10,790 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 90 [2018-10-24 12:39:10,790 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:10,790 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-24 12:39:10,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-24 12:39:10,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4005, Invalid=4005, Unknown=0, NotChecked=0, Total=8010 [2018-10-24 12:39:10,792 INFO L87 Difference]: Start difference. First operand 141 states and 141 transitions. Second operand 46 states. [2018-10-24 12:39:10,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:10,934 INFO L93 Difference]: Finished difference Result 150 states and 150 transitions. [2018-10-24 12:39:10,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-24 12:39:10,934 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 140 [2018-10-24 12:39:10,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:10,936 INFO L225 Difference]: With dead ends: 150 [2018-10-24 12:39:10,936 INFO L226 Difference]: Without dead ends: 145 [2018-10-24 12:39:10,937 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 237 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=4005, Invalid=4005, Unknown=0, NotChecked=0, Total=8010 [2018-10-24 12:39:10,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-10-24 12:39:10,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 144. [2018-10-24 12:39:10,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-10-24 12:39:10,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 144 transitions. [2018-10-24 12:39:10,941 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 144 transitions. Word has length 140 [2018-10-24 12:39:10,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:10,941 INFO L481 AbstractCegarLoop]: Abstraction has 144 states and 144 transitions. [2018-10-24 12:39:10,941 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-24 12:39:10,941 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 144 transitions. [2018-10-24 12:39:10,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-10-24 12:39:10,942 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:10,942 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:10,943 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:10,943 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:10,943 INFO L82 PathProgramCache]: Analyzing trace with hash -1670517287, now seen corresponding path program 44 times [2018-10-24 12:39:10,943 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:10,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:10,944 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:10,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:10,944 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:10,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:12,158 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:12,158 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:12,158 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:12,158 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:12,158 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:12,158 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:12,159 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:12,167 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:39:12,168 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:39:12,211 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-10-24 12:39:12,211 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:12,215 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:12,240 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:12,240 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:14,405 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:14,425 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:14,426 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 92 [2018-10-24 12:39:14,426 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:14,426 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-24 12:39:14,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-24 12:39:14,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2018-10-24 12:39:14,427 INFO L87 Difference]: Start difference. First operand 144 states and 144 transitions. Second operand 47 states. [2018-10-24 12:39:14,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:14,604 INFO L93 Difference]: Finished difference Result 153 states and 153 transitions. [2018-10-24 12:39:14,604 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:39:14,604 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 143 [2018-10-24 12:39:14,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:14,605 INFO L225 Difference]: With dead ends: 153 [2018-10-24 12:39:14,606 INFO L226 Difference]: Without dead ends: 148 [2018-10-24 12:39:14,606 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 242 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2018-10-24 12:39:14,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-10-24 12:39:14,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2018-10-24 12:39:14,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-10-24 12:39:14,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 147 transitions. [2018-10-24 12:39:14,613 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 147 transitions. Word has length 143 [2018-10-24 12:39:14,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:14,613 INFO L481 AbstractCegarLoop]: Abstraction has 147 states and 147 transitions. [2018-10-24 12:39:14,613 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-24 12:39:14,613 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 147 transitions. [2018-10-24 12:39:14,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-10-24 12:39:14,614 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:14,614 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:14,614 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:14,615 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:14,615 INFO L82 PathProgramCache]: Analyzing trace with hash 132553053, now seen corresponding path program 45 times [2018-10-24 12:39:14,615 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:14,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:14,616 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:14,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:14,616 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:14,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:15,580 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:15,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:15,580 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:15,580 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:15,581 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:15,581 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:15,581 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:15,590 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:39:15,590 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:39:15,616 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:39:15,616 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:15,620 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:15,643 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:15,643 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:17,934 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:17,954 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:17,955 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 94 [2018-10-24 12:39:17,955 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:17,955 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-24 12:39:17,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-24 12:39:17,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4371, Invalid=4371, Unknown=0, NotChecked=0, Total=8742 [2018-10-24 12:39:17,956 INFO L87 Difference]: Start difference. First operand 147 states and 147 transitions. Second operand 48 states. [2018-10-24 12:39:18,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:18,179 INFO L93 Difference]: Finished difference Result 156 states and 156 transitions. [2018-10-24 12:39:18,179 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-24 12:39:18,179 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 146 [2018-10-24 12:39:18,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:18,181 INFO L225 Difference]: With dead ends: 156 [2018-10-24 12:39:18,181 INFO L226 Difference]: Without dead ends: 151 [2018-10-24 12:39:18,182 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 247 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=4371, Invalid=4371, Unknown=0, NotChecked=0, Total=8742 [2018-10-24 12:39:18,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-10-24 12:39:18,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 150. [2018-10-24 12:39:18,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-10-24 12:39:18,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 150 transitions. [2018-10-24 12:39:18,185 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 150 transitions. Word has length 146 [2018-10-24 12:39:18,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:18,185 INFO L481 AbstractCegarLoop]: Abstraction has 150 states and 150 transitions. [2018-10-24 12:39:18,185 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-24 12:39:18,185 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 150 transitions. [2018-10-24 12:39:18,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-10-24 12:39:18,186 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:18,186 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:18,186 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:18,186 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:18,186 INFO L82 PathProgramCache]: Analyzing trace with hash -1754919079, now seen corresponding path program 46 times [2018-10-24 12:39:18,186 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:18,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:18,187 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:18,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:18,187 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:18,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:19,263 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:19,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:19,264 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:19,264 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:19,264 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:19,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:19,264 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:19,274 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:19,274 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:39:19,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:19,298 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:19,326 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:19,327 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:21,710 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:21,730 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:21,731 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 96 [2018-10-24 12:39:21,731 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:21,731 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-24 12:39:21,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-24 12:39:21,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2018-10-24 12:39:21,732 INFO L87 Difference]: Start difference. First operand 150 states and 150 transitions. Second operand 49 states. [2018-10-24 12:39:21,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:21,922 INFO L93 Difference]: Finished difference Result 159 states and 159 transitions. [2018-10-24 12:39:21,922 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-24 12:39:21,922 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 149 [2018-10-24 12:39:21,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:21,923 INFO L225 Difference]: With dead ends: 159 [2018-10-24 12:39:21,923 INFO L226 Difference]: Without dead ends: 154 [2018-10-24 12:39:21,924 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 252 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2018-10-24 12:39:21,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-10-24 12:39:21,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 153. [2018-10-24 12:39:21,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2018-10-24 12:39:21,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 153 transitions. [2018-10-24 12:39:21,928 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 153 transitions. Word has length 149 [2018-10-24 12:39:21,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:21,928 INFO L481 AbstractCegarLoop]: Abstraction has 153 states and 153 transitions. [2018-10-24 12:39:21,928 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-24 12:39:21,928 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 153 transitions. [2018-10-24 12:39:21,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2018-10-24 12:39:21,929 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:21,929 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:21,930 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:21,930 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:21,930 INFO L82 PathProgramCache]: Analyzing trace with hash -1725364259, now seen corresponding path program 47 times [2018-10-24 12:39:21,930 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:21,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:21,931 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:21,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:21,931 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:21,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:24,418 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:24,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:24,418 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:24,418 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:24,419 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:24,419 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:24,419 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:24,427 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:39:24,427 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:39:24,482 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-10-24 12:39:24,483 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:24,485 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:24,518 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:24,519 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:27,034 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:27,053 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:27,054 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 98 [2018-10-24 12:39:27,054 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:27,054 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-24 12:39:27,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-24 12:39:27,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:39:27,056 INFO L87 Difference]: Start difference. First operand 153 states and 153 transitions. Second operand 50 states. [2018-10-24 12:39:27,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:27,258 INFO L93 Difference]: Finished difference Result 162 states and 162 transitions. [2018-10-24 12:39:27,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-24 12:39:27,259 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 152 [2018-10-24 12:39:27,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:27,260 INFO L225 Difference]: With dead ends: 162 [2018-10-24 12:39:27,260 INFO L226 Difference]: Without dead ends: 157 [2018-10-24 12:39:27,261 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 257 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:39:27,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-24 12:39:27,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 156. [2018-10-24 12:39:27,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-10-24 12:39:27,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 156 transitions. [2018-10-24 12:39:27,265 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 156 transitions. Word has length 152 [2018-10-24 12:39:27,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:27,265 INFO L481 AbstractCegarLoop]: Abstraction has 156 states and 156 transitions. [2018-10-24 12:39:27,265 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-24 12:39:27,265 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 156 transitions. [2018-10-24 12:39:27,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-10-24 12:39:27,266 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:27,266 INFO L375 BasicCegarLoop]: trace histogram [49, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:27,266 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:27,266 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:27,266 INFO L82 PathProgramCache]: Analyzing trace with hash -1726017319, now seen corresponding path program 48 times [2018-10-24 12:39:27,266 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:27,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:27,267 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:27,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:27,267 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:27,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:28,262 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:28,262 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:28,262 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:28,262 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:28,262 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:28,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:28,263 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:28,269 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:39:28,270 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:39:28,320 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:39:28,320 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:28,323 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:28,356 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:28,356 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:30,904 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:30,924 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:30,924 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 100 [2018-10-24 12:39:30,924 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:30,925 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-24 12:39:30,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-24 12:39:30,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4950, Invalid=4950, Unknown=0, NotChecked=0, Total=9900 [2018-10-24 12:39:30,926 INFO L87 Difference]: Start difference. First operand 156 states and 156 transitions. Second operand 51 states. [2018-10-24 12:39:31,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:31,099 INFO L93 Difference]: Finished difference Result 165 states and 165 transitions. [2018-10-24 12:39:31,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-24 12:39:31,100 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 155 [2018-10-24 12:39:31,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:31,101 INFO L225 Difference]: With dead ends: 165 [2018-10-24 12:39:31,102 INFO L226 Difference]: Without dead ends: 160 [2018-10-24 12:39:31,103 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 262 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4950, Invalid=4950, Unknown=0, NotChecked=0, Total=9900 [2018-10-24 12:39:31,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-10-24 12:39:31,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2018-10-24 12:39:31,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-10-24 12:39:31,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 159 transitions. [2018-10-24 12:39:31,106 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 159 transitions. Word has length 155 [2018-10-24 12:39:31,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:31,107 INFO L481 AbstractCegarLoop]: Abstraction has 159 states and 159 transitions. [2018-10-24 12:39:31,107 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-24 12:39:31,107 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 159 transitions. [2018-10-24 12:39:31,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-10-24 12:39:31,108 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:31,108 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:31,108 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:31,108 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:31,108 INFO L82 PathProgramCache]: Analyzing trace with hash 293508701, now seen corresponding path program 49 times [2018-10-24 12:39:31,109 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:31,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:31,109 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:31,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:31,109 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:31,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:32,298 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:32,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:32,298 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:32,299 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:32,299 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:32,299 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:32,299 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:32,309 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:32,309 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:39:32,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:32,339 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:32,367 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:32,367 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:34,995 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:35,015 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:35,015 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 102 [2018-10-24 12:39:35,016 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:35,016 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-24 12:39:35,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-24 12:39:35,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-24 12:39:35,018 INFO L87 Difference]: Start difference. First operand 159 states and 159 transitions. Second operand 52 states. [2018-10-24 12:39:35,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:35,174 INFO L93 Difference]: Finished difference Result 168 states and 168 transitions. [2018-10-24 12:39:35,175 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-24 12:39:35,175 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 158 [2018-10-24 12:39:35,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:35,177 INFO L225 Difference]: With dead ends: 168 [2018-10-24 12:39:35,177 INFO L226 Difference]: Without dead ends: 163 [2018-10-24 12:39:35,178 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 267 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-24 12:39:35,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-10-24 12:39:35,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 162. [2018-10-24 12:39:35,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-10-24 12:39:35,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 162 transitions. [2018-10-24 12:39:35,181 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 162 transitions. Word has length 158 [2018-10-24 12:39:35,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:35,182 INFO L481 AbstractCegarLoop]: Abstraction has 162 states and 162 transitions. [2018-10-24 12:39:35,182 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-24 12:39:35,182 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 162 transitions. [2018-10-24 12:39:35,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-10-24 12:39:35,183 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:35,183 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:35,183 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:35,183 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:35,183 INFO L82 PathProgramCache]: Analyzing trace with hash 91288153, now seen corresponding path program 50 times [2018-10-24 12:39:35,184 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:35,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:35,184 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:35,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:35,185 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:35,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:38,292 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:38,292 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:38,292 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:38,292 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:38,292 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:38,293 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:38,293 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:38,302 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:39:38,302 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:39:38,349 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2018-10-24 12:39:38,349 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:38,352 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:38,390 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:38,390 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:41,359 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:41,379 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:41,379 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 104 [2018-10-24 12:39:41,379 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:41,380 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-24 12:39:41,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-24 12:39:41,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5356, Invalid=5356, Unknown=0, NotChecked=0, Total=10712 [2018-10-24 12:39:41,381 INFO L87 Difference]: Start difference. First operand 162 states and 162 transitions. Second operand 53 states. [2018-10-24 12:39:41,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:41,580 INFO L93 Difference]: Finished difference Result 171 states and 171 transitions. [2018-10-24 12:39:41,580 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-24 12:39:41,580 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 161 [2018-10-24 12:39:41,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:41,581 INFO L225 Difference]: With dead ends: 171 [2018-10-24 12:39:41,581 INFO L226 Difference]: Without dead ends: 166 [2018-10-24 12:39:41,581 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 272 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=5356, Invalid=5356, Unknown=0, NotChecked=0, Total=10712 [2018-10-24 12:39:41,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-10-24 12:39:41,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 165. [2018-10-24 12:39:41,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-10-24 12:39:41,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 165 transitions. [2018-10-24 12:39:41,585 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 165 transitions. Word has length 161 [2018-10-24 12:39:41,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:41,585 INFO L481 AbstractCegarLoop]: Abstraction has 165 states and 165 transitions. [2018-10-24 12:39:41,585 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-24 12:39:41,586 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 165 transitions. [2018-10-24 12:39:41,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-10-24 12:39:41,586 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:41,587 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:41,587 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:41,587 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:41,587 INFO L82 PathProgramCache]: Analyzing trace with hash 1578058973, now seen corresponding path program 51 times [2018-10-24 12:39:41,587 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:41,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:41,588 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:41,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:41,588 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:41,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:42,663 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:42,663 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:42,663 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:42,663 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:42,663 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:42,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:42,664 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:42,671 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:39:42,671 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:39:42,696 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:39:42,696 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:42,699 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:42,736 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:42,736 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:45,614 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:45,634 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:45,635 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 106 [2018-10-24 12:39:45,635 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:45,635 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-24 12:39:45,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-24 12:39:45,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5565, Invalid=5565, Unknown=0, NotChecked=0, Total=11130 [2018-10-24 12:39:45,636 INFO L87 Difference]: Start difference. First operand 165 states and 165 transitions. Second operand 54 states. [2018-10-24 12:39:45,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:45,826 INFO L93 Difference]: Finished difference Result 174 states and 174 transitions. [2018-10-24 12:39:45,826 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-10-24 12:39:45,826 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 164 [2018-10-24 12:39:45,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:45,827 INFO L225 Difference]: With dead ends: 174 [2018-10-24 12:39:45,827 INFO L226 Difference]: Without dead ends: 169 [2018-10-24 12:39:45,828 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 277 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=5565, Invalid=5565, Unknown=0, NotChecked=0, Total=11130 [2018-10-24 12:39:45,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-10-24 12:39:45,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 168. [2018-10-24 12:39:45,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-10-24 12:39:45,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 168 transitions. [2018-10-24 12:39:45,831 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 168 transitions. Word has length 164 [2018-10-24 12:39:45,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:45,831 INFO L481 AbstractCegarLoop]: Abstraction has 168 states and 168 transitions. [2018-10-24 12:39:45,831 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-24 12:39:45,831 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 168 transitions. [2018-10-24 12:39:45,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-10-24 12:39:45,832 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:45,832 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:45,832 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:45,832 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:45,832 INFO L82 PathProgramCache]: Analyzing trace with hash -30166055, now seen corresponding path program 52 times [2018-10-24 12:39:45,832 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:45,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:45,833 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:45,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:45,833 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:45,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:48,223 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:48,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:48,223 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:48,223 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:48,223 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:48,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:48,223 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:48,231 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:48,232 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:39:48,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:48,263 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:48,304 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:48,304 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:51,329 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:51,349 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:51,349 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 108 [2018-10-24 12:39:51,349 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:51,350 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-24 12:39:51,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-24 12:39:51,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5778, Invalid=5778, Unknown=0, NotChecked=0, Total=11556 [2018-10-24 12:39:51,351 INFO L87 Difference]: Start difference. First operand 168 states and 168 transitions. Second operand 55 states. [2018-10-24 12:39:51,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:51,556 INFO L93 Difference]: Finished difference Result 177 states and 177 transitions. [2018-10-24 12:39:51,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-24 12:39:51,556 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 167 [2018-10-24 12:39:51,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:51,557 INFO L225 Difference]: With dead ends: 177 [2018-10-24 12:39:51,557 INFO L226 Difference]: Without dead ends: 172 [2018-10-24 12:39:51,558 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 282 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=5778, Invalid=5778, Unknown=0, NotChecked=0, Total=11556 [2018-10-24 12:39:51,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-10-24 12:39:51,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 171. [2018-10-24 12:39:51,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-10-24 12:39:51,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 171 transitions. [2018-10-24 12:39:51,561 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 171 transitions. Word has length 167 [2018-10-24 12:39:51,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:51,561 INFO L481 AbstractCegarLoop]: Abstraction has 171 states and 171 transitions. [2018-10-24 12:39:51,561 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-24 12:39:51,561 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 171 transitions. [2018-10-24 12:39:51,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-10-24 12:39:51,562 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:51,562 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:51,562 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:51,562 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:51,562 INFO L82 PathProgramCache]: Analyzing trace with hash -301788323, now seen corresponding path program 53 times [2018-10-24 12:39:51,562 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:51,563 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:51,563 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:51,563 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:51,563 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:51,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:52,750 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:52,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:52,750 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:52,750 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:52,750 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:52,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:52,751 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:52,758 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:39:52,758 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:39:52,812 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2018-10-24 12:39:52,812 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:52,815 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:52,845 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:52,845 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:55,953 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:55,975 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:55,975 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 110 [2018-10-24 12:39:55,975 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:55,976 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-10-24 12:39:55,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-10-24 12:39:55,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5995, Invalid=5995, Unknown=0, NotChecked=0, Total=11990 [2018-10-24 12:39:55,977 INFO L87 Difference]: Start difference. First operand 171 states and 171 transitions. Second operand 56 states. [2018-10-24 12:39:56,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:56,145 INFO L93 Difference]: Finished difference Result 180 states and 180 transitions. [2018-10-24 12:39:56,145 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-24 12:39:56,146 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 170 [2018-10-24 12:39:56,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:56,147 INFO L225 Difference]: With dead ends: 180 [2018-10-24 12:39:56,147 INFO L226 Difference]: Without dead ends: 175 [2018-10-24 12:39:56,148 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 287 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=5995, Invalid=5995, Unknown=0, NotChecked=0, Total=11990 [2018-10-24 12:39:56,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-10-24 12:39:56,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 174. [2018-10-24 12:39:56,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-10-24 12:39:56,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 174 transitions. [2018-10-24 12:39:56,151 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 174 transitions. Word has length 170 [2018-10-24 12:39:56,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:56,152 INFO L481 AbstractCegarLoop]: Abstraction has 174 states and 174 transitions. [2018-10-24 12:39:56,152 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-10-24 12:39:56,152 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 174 transitions. [2018-10-24 12:39:56,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-10-24 12:39:56,153 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:56,153 INFO L375 BasicCegarLoop]: trace histogram [55, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:56,153 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:56,154 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:56,154 INFO L82 PathProgramCache]: Analyzing trace with hash -482388647, now seen corresponding path program 54 times [2018-10-24 12:39:56,154 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:56,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:56,155 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:56,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:56,155 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:56,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:02,722 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:02,722 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:02,722 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:02,722 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:02,723 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:02,723 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:02,723 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:02,732 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:40:02,732 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:40:02,776 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:40:02,776 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:40:02,780 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:02,826 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:02,826 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:06,346 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:06,366 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:06,366 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 112 [2018-10-24 12:40:06,366 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:06,367 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-24 12:40:06,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-24 12:40:06,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6216, Invalid=6216, Unknown=0, NotChecked=0, Total=12432 [2018-10-24 12:40:06,368 INFO L87 Difference]: Start difference. First operand 174 states and 174 transitions. Second operand 57 states. [2018-10-24 12:40:06,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:06,577 INFO L93 Difference]: Finished difference Result 183 states and 183 transitions. [2018-10-24 12:40:06,577 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-10-24 12:40:06,577 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 173 [2018-10-24 12:40:06,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:06,578 INFO L225 Difference]: With dead ends: 183 [2018-10-24 12:40:06,578 INFO L226 Difference]: Without dead ends: 178 [2018-10-24 12:40:06,579 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 292 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=6216, Invalid=6216, Unknown=0, NotChecked=0, Total=12432 [2018-10-24 12:40:06,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-10-24 12:40:06,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 177. [2018-10-24 12:40:06,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-10-24 12:40:06,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 177 transitions. [2018-10-24 12:40:06,583 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 177 transitions. Word has length 173 [2018-10-24 12:40:06,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:06,584 INFO L481 AbstractCegarLoop]: Abstraction has 177 states and 177 transitions. [2018-10-24 12:40:06,584 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-24 12:40:06,584 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 177 transitions. [2018-10-24 12:40:06,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-10-24 12:40:06,585 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:06,585 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:06,585 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:06,585 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:06,586 INFO L82 PathProgramCache]: Analyzing trace with hash 847380957, now seen corresponding path program 55 times [2018-10-24 12:40:06,586 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:06,586 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:06,586 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:40:06,586 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:06,586 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:06,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:10,107 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:10,107 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:10,107 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:10,108 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:10,108 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:10,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:10,108 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:10,115 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:40:10,115 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:40:10,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:10,146 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:10,190 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:10,191 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:13,672 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:13,692 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:13,692 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 114 [2018-10-24 12:40:13,692 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:13,692 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-10-24 12:40:13,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-10-24 12:40:13,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6441, Invalid=6441, Unknown=0, NotChecked=0, Total=12882 [2018-10-24 12:40:13,694 INFO L87 Difference]: Start difference. First operand 177 states and 177 transitions. Second operand 58 states. [2018-10-24 12:40:13,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:13,941 INFO L93 Difference]: Finished difference Result 186 states and 186 transitions. [2018-10-24 12:40:13,941 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-24 12:40:13,941 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 176 [2018-10-24 12:40:13,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:13,943 INFO L225 Difference]: With dead ends: 186 [2018-10-24 12:40:13,943 INFO L226 Difference]: Without dead ends: 181 [2018-10-24 12:40:13,944 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 297 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=6441, Invalid=6441, Unknown=0, NotChecked=0, Total=12882 [2018-10-24 12:40:13,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-10-24 12:40:13,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 180. [2018-10-24 12:40:13,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-10-24 12:40:13,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 180 transitions. [2018-10-24 12:40:13,948 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 180 transitions. Word has length 176 [2018-10-24 12:40:13,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:13,948 INFO L481 AbstractCegarLoop]: Abstraction has 180 states and 180 transitions. [2018-10-24 12:40:13,948 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-10-24 12:40:13,948 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 180 transitions. [2018-10-24 12:40:13,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-10-24 12:40:13,949 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:13,949 INFO L375 BasicCegarLoop]: trace histogram [57, 56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:13,950 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:13,950 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:13,950 INFO L82 PathProgramCache]: Analyzing trace with hash -764684583, now seen corresponding path program 56 times [2018-10-24 12:40:13,950 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:13,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:13,951 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:40:13,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:13,951 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:13,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:17,508 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:17,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:17,508 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:17,508 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:17,508 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:17,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:17,508 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:17,518 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:40:17,519 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:40:17,580 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2018-10-24 12:40:17,580 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:40:17,583 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:17,624 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:17,624 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:21,038 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:21,059 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:21,059 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 116 [2018-10-24 12:40:21,060 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:21,060 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-10-24 12:40:21,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-10-24 12:40:21,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6670, Invalid=6670, Unknown=0, NotChecked=0, Total=13340 [2018-10-24 12:40:21,061 INFO L87 Difference]: Start difference. First operand 180 states and 180 transitions. Second operand 59 states. [2018-10-24 12:40:21,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:21,329 INFO L93 Difference]: Finished difference Result 189 states and 189 transitions. [2018-10-24 12:40:21,329 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-24 12:40:21,329 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 179 [2018-10-24 12:40:21,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:21,330 INFO L225 Difference]: With dead ends: 189 [2018-10-24 12:40:21,331 INFO L226 Difference]: Without dead ends: 184 [2018-10-24 12:40:21,332 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 302 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=6670, Invalid=6670, Unknown=0, NotChecked=0, Total=13340 [2018-10-24 12:40:21,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-10-24 12:40:21,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 183. [2018-10-24 12:40:21,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-10-24 12:40:21,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 183 transitions. [2018-10-24 12:40:21,336 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 183 transitions. Word has length 179 [2018-10-24 12:40:21,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:21,336 INFO L481 AbstractCegarLoop]: Abstraction has 183 states and 183 transitions. [2018-10-24 12:40:21,336 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-10-24 12:40:21,337 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 183 transitions. [2018-10-24 12:40:21,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-10-24 12:40:21,338 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:21,338 INFO L375 BasicCegarLoop]: trace histogram [58, 57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:21,338 INFO L424 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:21,338 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:21,338 INFO L82 PathProgramCache]: Analyzing trace with hash 515117149, now seen corresponding path program 57 times [2018-10-24 12:40:21,338 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:21,339 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:21,339 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:40:21,339 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:21,339 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:21,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:23,682 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:23,682 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:23,682 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:23,683 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:23,683 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:23,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:23,683 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:23,689 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:40:23,690 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:40:23,729 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:40:23,729 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:40:23,732 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:23,778 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:23,778 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:27,418 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:27,438 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:27,438 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 118 [2018-10-24 12:40:27,439 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:27,439 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-24 12:40:27,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-24 12:40:27,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6903, Invalid=6903, Unknown=0, NotChecked=0, Total=13806 [2018-10-24 12:40:27,440 INFO L87 Difference]: Start difference. First operand 183 states and 183 transitions. Second operand 60 states. [2018-10-24 12:40:27,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:27,683 INFO L93 Difference]: Finished difference Result 192 states and 192 transitions. [2018-10-24 12:40:27,683 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-10-24 12:40:27,683 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 182 [2018-10-24 12:40:27,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:27,684 INFO L225 Difference]: With dead ends: 192 [2018-10-24 12:40:27,685 INFO L226 Difference]: Without dead ends: 187 [2018-10-24 12:40:27,685 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 307 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=6903, Invalid=6903, Unknown=0, NotChecked=0, Total=13806 [2018-10-24 12:40:27,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-24 12:40:27,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 186. [2018-10-24 12:40:27,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-10-24 12:40:27,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 186 transitions. [2018-10-24 12:40:27,689 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 186 transitions. Word has length 182 [2018-10-24 12:40:27,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:27,689 INFO L481 AbstractCegarLoop]: Abstraction has 186 states and 186 transitions. [2018-10-24 12:40:27,690 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-24 12:40:27,690 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 186 transitions. [2018-10-24 12:40:27,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-10-24 12:40:27,691 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:27,691 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:27,691 INFO L424 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:27,691 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:27,692 INFO L82 PathProgramCache]: Analyzing trace with hash 663828569, now seen corresponding path program 58 times [2018-10-24 12:40:27,692 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:27,692 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:27,692 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:40:27,692 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:27,693 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:27,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:29,067 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:29,067 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:29,067 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:29,068 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:29,068 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:29,068 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:29,068 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:29,076 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:40:29,076 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:40:29,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:29,119 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:29,166 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:29,166 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:32,993 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:33,012 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:33,013 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 120 [2018-10-24 12:40:33,013 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:33,013 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-10-24 12:40:33,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-10-24 12:40:33,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7140, Invalid=7140, Unknown=0, NotChecked=0, Total=14280 [2018-10-24 12:40:33,014 INFO L87 Difference]: Start difference. First operand 186 states and 186 transitions. Second operand 61 states. [2018-10-24 12:40:33,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:33,225 INFO L93 Difference]: Finished difference Result 195 states and 195 transitions. [2018-10-24 12:40:33,225 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-24 12:40:33,226 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 185 [2018-10-24 12:40:33,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:33,227 INFO L225 Difference]: With dead ends: 195 [2018-10-24 12:40:33,228 INFO L226 Difference]: Without dead ends: 190 [2018-10-24 12:40:33,228 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 312 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=7140, Invalid=7140, Unknown=0, NotChecked=0, Total=14280 [2018-10-24 12:40:33,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-10-24 12:40:33,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 189. [2018-10-24 12:40:33,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-10-24 12:40:33,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 189 transitions. [2018-10-24 12:40:33,232 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 189 transitions. Word has length 185 [2018-10-24 12:40:33,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:33,232 INFO L481 AbstractCegarLoop]: Abstraction has 189 states and 189 transitions. [2018-10-24 12:40:33,233 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-10-24 12:40:33,233 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 189 transitions. [2018-10-24 12:40:33,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-10-24 12:40:33,234 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:33,234 INFO L375 BasicCegarLoop]: trace histogram [60, 59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:33,234 INFO L424 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:33,234 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:33,234 INFO L82 PathProgramCache]: Analyzing trace with hash -1480507683, now seen corresponding path program 59 times [2018-10-24 12:40:33,235 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:33,235 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:33,235 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:40:33,235 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:33,235 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:33,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:34,665 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:34,666 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:34,666 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:34,666 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:34,666 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:34,666 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:34,666 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:34,673 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:40:34,673 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:40:34,732 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2018-10-24 12:40:34,733 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:40:34,736 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:34,782 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:34,782 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:38,678 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:38,698 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:38,699 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 122 [2018-10-24 12:40:38,699 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:38,699 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-10-24 12:40:38,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-10-24 12:40:38,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7381, Invalid=7381, Unknown=0, NotChecked=0, Total=14762 [2018-10-24 12:40:38,700 INFO L87 Difference]: Start difference. First operand 189 states and 189 transitions. Second operand 62 states. [2018-10-24 12:40:38,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:38,974 INFO L93 Difference]: Finished difference Result 198 states and 198 transitions. [2018-10-24 12:40:38,974 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-10-24 12:40:38,975 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 188 [2018-10-24 12:40:38,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:38,976 INFO L225 Difference]: With dead ends: 198 [2018-10-24 12:40:38,976 INFO L226 Difference]: Without dead ends: 193 [2018-10-24 12:40:38,977 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 317 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=7381, Invalid=7381, Unknown=0, NotChecked=0, Total=14762 [2018-10-24 12:40:38,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-10-24 12:40:38,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 192. [2018-10-24 12:40:38,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-10-24 12:40:38,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 192 transitions. [2018-10-24 12:40:38,980 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 192 transitions. Word has length 188 [2018-10-24 12:40:38,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:38,980 INFO L481 AbstractCegarLoop]: Abstraction has 192 states and 192 transitions. [2018-10-24 12:40:38,980 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-10-24 12:40:38,980 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 192 transitions. [2018-10-24 12:40:38,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-10-24 12:40:38,981 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:38,981 INFO L375 BasicCegarLoop]: trace histogram [61, 60, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:38,981 INFO L424 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:38,981 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:38,981 INFO L82 PathProgramCache]: Analyzing trace with hash -58230311, now seen corresponding path program 60 times [2018-10-24 12:40:38,981 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:38,982 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:38,982 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:40:38,982 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:38,982 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:38,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:40,357 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:40,357 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:40,357 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:40,357 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:40,357 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:40,357 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:40,357 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:40,366 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:40:40,366 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:40:40,394 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:40:40,394 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:40:40,398 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:40,434 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:40,435 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:44,394 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:44,414 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:44,414 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 124 [2018-10-24 12:40:44,414 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:44,415 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-10-24 12:40:44,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-10-24 12:40:44,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7626, Invalid=7626, Unknown=0, NotChecked=0, Total=15252 [2018-10-24 12:40:44,416 INFO L87 Difference]: Start difference. First operand 192 states and 192 transitions. Second operand 63 states. [2018-10-24 12:40:45,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:45,691 INFO L93 Difference]: Finished difference Result 201 states and 201 transitions. [2018-10-24 12:40:45,691 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-24 12:40:45,691 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 191 [2018-10-24 12:40:45,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:45,693 INFO L225 Difference]: With dead ends: 201 [2018-10-24 12:40:45,693 INFO L226 Difference]: Without dead ends: 196 [2018-10-24 12:40:45,694 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 322 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=7626, Invalid=7626, Unknown=0, NotChecked=0, Total=15252 [2018-10-24 12:40:45,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-10-24 12:40:45,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 195. [2018-10-24 12:40:45,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2018-10-24 12:40:45,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 195 transitions. [2018-10-24 12:40:45,699 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 195 transitions. Word has length 191 [2018-10-24 12:40:45,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:45,699 INFO L481 AbstractCegarLoop]: Abstraction has 195 states and 195 transitions. [2018-10-24 12:40:45,699 INFO L482 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-10-24 12:40:45,699 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 195 transitions. [2018-10-24 12:40:45,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-10-24 12:40:45,700 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:45,701 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:45,701 INFO L424 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:45,701 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:45,701 INFO L82 PathProgramCache]: Analyzing trace with hash 1154583901, now seen corresponding path program 61 times [2018-10-24 12:40:45,701 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:45,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:45,702 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:40:45,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:45,702 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:45,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:47,521 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:47,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:47,522 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:47,522 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:47,522 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:47,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:47,522 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:47,529 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:40:47,529 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:40:47,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:47,565 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:47,603 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:47,603 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:51,654 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:51,675 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:51,675 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 126 [2018-10-24 12:40:51,675 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:51,676 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-10-24 12:40:51,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-10-24 12:40:51,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7875, Invalid=7875, Unknown=0, NotChecked=0, Total=15750 [2018-10-24 12:40:51,677 INFO L87 Difference]: Start difference. First operand 195 states and 195 transitions. Second operand 64 states. [2018-10-24 12:40:51,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:51,967 INFO L93 Difference]: Finished difference Result 204 states and 204 transitions. [2018-10-24 12:40:51,967 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-10-24 12:40:51,967 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 194 [2018-10-24 12:40:51,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:51,968 INFO L225 Difference]: With dead ends: 204 [2018-10-24 12:40:51,968 INFO L226 Difference]: Without dead ends: 199 [2018-10-24 12:40:51,969 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 451 GetRequests, 327 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=7875, Invalid=7875, Unknown=0, NotChecked=0, Total=15750 [2018-10-24 12:40:51,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-10-24 12:40:51,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 198. [2018-10-24 12:40:51,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-10-24 12:40:51,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 198 transitions. [2018-10-24 12:40:51,974 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 198 transitions. Word has length 194 [2018-10-24 12:40:51,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:51,974 INFO L481 AbstractCegarLoop]: Abstraction has 198 states and 198 transitions. [2018-10-24 12:40:51,974 INFO L482 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-10-24 12:40:51,975 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 198 transitions. [2018-10-24 12:40:51,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-10-24 12:40:51,976 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:51,976 INFO L375 BasicCegarLoop]: trace histogram [63, 62, 62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:51,976 INFO L424 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:51,976 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:51,976 INFO L82 PathProgramCache]: Analyzing trace with hash -1457087655, now seen corresponding path program 62 times [2018-10-24 12:40:51,977 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:51,977 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:51,977 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:40:51,977 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:51,977 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:51,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:53,466 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:53,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:53,466 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:53,466 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:53,466 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:53,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:53,467 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:53,475 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:40:53,476 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:40:53,541 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 63 check-sat command(s) [2018-10-24 12:40:53,541 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:40:53,544 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:53,583 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:53,583 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:57,745 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:57,766 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:57,766 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 128 [2018-10-24 12:40:57,766 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:57,767 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-10-24 12:40:57,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-10-24 12:40:57,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8128, Invalid=8128, Unknown=0, NotChecked=0, Total=16256 [2018-10-24 12:40:57,768 INFO L87 Difference]: Start difference. First operand 198 states and 198 transitions. Second operand 65 states. [2018-10-24 12:40:58,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:58,069 INFO L93 Difference]: Finished difference Result 207 states and 207 transitions. [2018-10-24 12:40:58,069 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-24 12:40:58,069 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 197 [2018-10-24 12:40:58,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:58,070 INFO L225 Difference]: With dead ends: 207 [2018-10-24 12:40:58,071 INFO L226 Difference]: Without dead ends: 202 [2018-10-24 12:40:58,071 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 332 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=8128, Invalid=8128, Unknown=0, NotChecked=0, Total=16256 [2018-10-24 12:40:58,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2018-10-24 12:40:58,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 201. [2018-10-24 12:40:58,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2018-10-24 12:40:58,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 201 transitions. [2018-10-24 12:40:58,075 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 201 transitions. Word has length 197 [2018-10-24 12:40:58,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:58,076 INFO L481 AbstractCegarLoop]: Abstraction has 201 states and 201 transitions. [2018-10-24 12:40:58,076 INFO L482 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-10-24 12:40:58,076 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 201 transitions. [2018-10-24 12:40:58,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2018-10-24 12:40:58,077 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:58,077 INFO L375 BasicCegarLoop]: trace histogram [64, 63, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:58,077 INFO L424 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:58,078 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:58,078 INFO L82 PathProgramCache]: Analyzing trace with hash 1863121885, now seen corresponding path program 63 times [2018-10-24 12:40:58,078 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:58,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:58,079 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:40:58,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:58,079 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:58,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:59,643 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:59,643 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:59,644 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:59,644 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:59,644 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:59,644 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:59,644 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:59,654 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:40:59,654 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:40:59,685 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:40:59,685 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:40:59,688 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:59,740 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:59,741 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:41:05,299 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:05,319 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:41:05,319 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 130 [2018-10-24 12:41:05,319 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:41:05,319 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-10-24 12:41:05,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-10-24 12:41:05,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8385, Invalid=8385, Unknown=0, NotChecked=0, Total=16770 [2018-10-24 12:41:05,321 INFO L87 Difference]: Start difference. First operand 201 states and 201 transitions. Second operand 66 states. [2018-10-24 12:41:05,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:41:05,626 INFO L93 Difference]: Finished difference Result 210 states and 210 transitions. [2018-10-24 12:41:05,627 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-10-24 12:41:05,627 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 200 [2018-10-24 12:41:05,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:41:05,628 INFO L225 Difference]: With dead ends: 210 [2018-10-24 12:41:05,628 INFO L226 Difference]: Without dead ends: 205 [2018-10-24 12:41:05,628 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 337 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=8385, Invalid=8385, Unknown=0, NotChecked=0, Total=16770 [2018-10-24 12:41:05,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-10-24 12:41:05,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 204. [2018-10-24 12:41:05,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2018-10-24 12:41:05,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 204 transitions. [2018-10-24 12:41:05,631 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 204 transitions. Word has length 200 [2018-10-24 12:41:05,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:41:05,632 INFO L481 AbstractCegarLoop]: Abstraction has 204 states and 204 transitions. [2018-10-24 12:41:05,632 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-10-24 12:41:05,632 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 204 transitions. [2018-10-24 12:41:05,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2018-10-24 12:41:05,633 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:41:05,633 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:41:05,633 INFO L424 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:41:05,634 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:41:05,634 INFO L82 PathProgramCache]: Analyzing trace with hash 1128701145, now seen corresponding path program 64 times [2018-10-24 12:41:05,634 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:41:05,634 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:05,635 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:41:05,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:05,635 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:41:05,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:41:07,248 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:07,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:07,249 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:41:07,249 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:41:07,249 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:41:07,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:07,249 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:41:07,257 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:41:07,257 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:41:07,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:41:07,295 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:41:07,335 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:07,336 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:41:11,769 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:11,788 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:41:11,789 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 132 [2018-10-24 12:41:11,789 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:41:11,789 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-10-24 12:41:11,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-10-24 12:41:11,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8646, Invalid=8646, Unknown=0, NotChecked=0, Total=17292 [2018-10-24 12:41:11,790 INFO L87 Difference]: Start difference. First operand 204 states and 204 transitions. Second operand 67 states. [2018-10-24 12:41:12,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:41:12,014 INFO L93 Difference]: Finished difference Result 213 states and 213 transitions. [2018-10-24 12:41:12,015 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-24 12:41:12,015 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 203 [2018-10-24 12:41:12,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:41:12,016 INFO L225 Difference]: With dead ends: 213 [2018-10-24 12:41:12,016 INFO L226 Difference]: Without dead ends: 208 [2018-10-24 12:41:12,017 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=8646, Invalid=8646, Unknown=0, NotChecked=0, Total=17292 [2018-10-24 12:41:12,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2018-10-24 12:41:12,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 207. [2018-10-24 12:41:12,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-10-24 12:41:12,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 207 transitions. [2018-10-24 12:41:12,021 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 207 transitions. Word has length 203 [2018-10-24 12:41:12,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:41:12,021 INFO L481 AbstractCegarLoop]: Abstraction has 207 states and 207 transitions. [2018-10-24 12:41:12,021 INFO L482 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-10-24 12:41:12,021 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 207 transitions. [2018-10-24 12:41:12,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-10-24 12:41:12,022 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:41:12,022 INFO L375 BasicCegarLoop]: trace histogram [66, 65, 65, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:41:12,022 INFO L424 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:41:12,022 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:41:12,023 INFO L82 PathProgramCache]: Analyzing trace with hash 563841629, now seen corresponding path program 65 times [2018-10-24 12:41:12,023 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:41:12,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:12,023 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:41:12,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:12,023 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:41:12,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:41:13,634 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:13,635 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:13,635 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:41:13,635 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:41:13,635 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:41:13,635 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:13,635 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:41:13,653 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:41:13,654 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:41:13,720 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 66 check-sat command(s) [2018-10-24 12:41:13,720 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:41:13,723 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:41:13,765 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:13,765 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:41:18,297 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:18,317 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:41:18,317 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 134 [2018-10-24 12:41:18,317 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:41:18,317 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-10-24 12:41:18,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-10-24 12:41:18,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8911, Invalid=8911, Unknown=0, NotChecked=0, Total=17822 [2018-10-24 12:41:18,319 INFO L87 Difference]: Start difference. First operand 207 states and 207 transitions. Second operand 68 states. [2018-10-24 12:41:18,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:41:18,544 INFO L93 Difference]: Finished difference Result 216 states and 216 transitions. [2018-10-24 12:41:18,544 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-10-24 12:41:18,544 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 206 [2018-10-24 12:41:18,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:41:18,546 INFO L225 Difference]: With dead ends: 216 [2018-10-24 12:41:18,546 INFO L226 Difference]: Without dead ends: 211 [2018-10-24 12:41:18,547 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 347 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=8911, Invalid=8911, Unknown=0, NotChecked=0, Total=17822 [2018-10-24 12:41:18,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2018-10-24 12:41:18,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 210. [2018-10-24 12:41:18,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-10-24 12:41:18,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 210 transitions. [2018-10-24 12:41:18,551 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 210 transitions. Word has length 206 [2018-10-24 12:41:18,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:41:18,552 INFO L481 AbstractCegarLoop]: Abstraction has 210 states and 210 transitions. [2018-10-24 12:41:18,552 INFO L482 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-10-24 12:41:18,552 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 210 transitions. [2018-10-24 12:41:18,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-10-24 12:41:18,553 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:41:18,553 INFO L375 BasicCegarLoop]: trace histogram [67, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:41:18,553 INFO L424 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:41:18,553 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:41:18,553 INFO L82 PathProgramCache]: Analyzing trace with hash 515866201, now seen corresponding path program 66 times [2018-10-24 12:41:18,554 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:41:18,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:18,554 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:41:18,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:18,554 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:41:18,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:41:20,422 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:20,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:20,422 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:41:20,423 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:41:20,423 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:41:20,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:20,423 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:41:20,431 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:41:20,432 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:41:20,466 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:41:20,466 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:41:20,470 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:41:20,513 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:20,513 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:41:25,225 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:25,246 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:41:25,247 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 136 [2018-10-24 12:41:25,247 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:41:25,247 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-10-24 12:41:25,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-10-24 12:41:25,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9180, Invalid=9180, Unknown=0, NotChecked=0, Total=18360 [2018-10-24 12:41:25,248 INFO L87 Difference]: Start difference. First operand 210 states and 210 transitions. Second operand 69 states. [2018-10-24 12:41:25,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:41:25,502 INFO L93 Difference]: Finished difference Result 219 states and 219 transitions. [2018-10-24 12:41:25,502 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-24 12:41:25,502 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 209 [2018-10-24 12:41:25,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:41:25,503 INFO L225 Difference]: With dead ends: 219 [2018-10-24 12:41:25,503 INFO L226 Difference]: Without dead ends: 214 [2018-10-24 12:41:25,504 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 352 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=9180, Invalid=9180, Unknown=0, NotChecked=0, Total=18360 [2018-10-24 12:41:25,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-10-24 12:41:25,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 213. [2018-10-24 12:41:25,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2018-10-24 12:41:25,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 213 transitions. [2018-10-24 12:41:25,509 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 213 transitions. Word has length 209 [2018-10-24 12:41:25,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:41:25,509 INFO L481 AbstractCegarLoop]: Abstraction has 213 states and 213 transitions. [2018-10-24 12:41:25,509 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-10-24 12:41:25,509 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 213 transitions. [2018-10-24 12:41:25,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2018-10-24 12:41:25,510 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:41:25,511 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:41:25,511 INFO L424 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:41:25,511 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:41:25,511 INFO L82 PathProgramCache]: Analyzing trace with hash 1504000221, now seen corresponding path program 67 times [2018-10-24 12:41:25,511 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:41:25,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:25,512 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:41:25,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:25,512 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:41:25,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:41:27,328 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:27,328 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:27,328 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:41:27,328 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:41:27,329 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:41:27,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:27,329 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:41:27,336 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:41:27,336 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:41:27,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:41:27,377 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:41:27,420 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:27,420 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:41:32,278 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:32,298 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:41:32,298 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 138 [2018-10-24 12:41:32,298 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:41:32,299 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-10-24 12:41:32,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-10-24 12:41:32,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9453, Invalid=9453, Unknown=0, NotChecked=0, Total=18906 [2018-10-24 12:41:32,300 INFO L87 Difference]: Start difference. First operand 213 states and 213 transitions. Second operand 70 states. [2018-10-24 12:41:32,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:41:32,632 INFO L93 Difference]: Finished difference Result 222 states and 222 transitions. [2018-10-24 12:41:32,632 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-10-24 12:41:32,633 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 212 [2018-10-24 12:41:32,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:41:32,634 INFO L225 Difference]: With dead ends: 222 [2018-10-24 12:41:32,634 INFO L226 Difference]: Without dead ends: 217 [2018-10-24 12:41:32,635 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 357 SyntacticMatches, 0 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=9453, Invalid=9453, Unknown=0, NotChecked=0, Total=18906 [2018-10-24 12:41:32,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2018-10-24 12:41:32,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 216. [2018-10-24 12:41:32,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2018-10-24 12:41:32,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 216 transitions. [2018-10-24 12:41:32,640 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 216 transitions. Word has length 212 [2018-10-24 12:41:32,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:41:32,641 INFO L481 AbstractCegarLoop]: Abstraction has 216 states and 216 transitions. [2018-10-24 12:41:32,641 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-10-24 12:41:32,641 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 216 transitions. [2018-10-24 12:41:32,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2018-10-24 12:41:32,642 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:41:32,642 INFO L375 BasicCegarLoop]: trace histogram [69, 68, 68, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:41:32,642 INFO L424 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:41:32,643 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:41:32,643 INFO L82 PathProgramCache]: Analyzing trace with hash 1298743257, now seen corresponding path program 68 times [2018-10-24 12:41:32,643 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:41:32,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:32,644 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:41:32,644 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:32,644 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:41:32,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:41:34,482 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:34,483 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:34,483 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:41:34,483 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:41:34,483 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:41:34,483 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:34,483 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:41:34,490 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:41:34,490 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:41:34,562 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2018-10-24 12:41:34,562 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:41:34,565 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:41:34,620 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:34,621 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-10-24 12:41:37,327 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-24 12:41:37,528 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:41:37,528 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-24 12:41:37,534 WARN L205 ceAbstractionStarter]: Timeout [2018-10-24 12:41:37,534 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:41:37 BoogieIcfgContainer [2018-10-24 12:41:37,534 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:41:37,535 INFO L168 Benchmark]: Toolchain (without parser) took 223043.73 ms. Allocated memory was 1.6 GB in the beginning and 2.2 GB in the end (delta: 684.7 MB). Free memory was 1.4 GB in the beginning and 2.0 GB in the end (delta: -603.6 MB). Peak memory consumption was 81.1 MB. Max. memory is 7.1 GB. [2018-10-24 12:41:37,536 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 1.6 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:41:37,537 INFO L168 Benchmark]: CACSL2BoogieTranslator took 276.45 ms. Allocated memory is still 1.6 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:41:37,537 INFO L168 Benchmark]: Boogie Procedure Inliner took 22.12 ms. Allocated memory is still 1.6 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:41:37,537 INFO L168 Benchmark]: Boogie Preprocessor took 27.37 ms. Allocated memory is still 1.6 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:41:37,538 INFO L168 Benchmark]: RCFGBuilder took 288.86 ms. Allocated memory was 1.6 GB in the beginning and 2.3 GB in the end (delta: 760.2 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -801.4 MB). Peak memory consumption was 26.7 MB. Max. memory is 7.1 GB. [2018-10-24 12:41:37,538 INFO L168 Benchmark]: TraceAbstraction took 222423.92 ms. Allocated memory was 2.3 GB in the beginning and 2.2 GB in the end (delta: -75.5 MB). Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 187.2 MB). Peak memory consumption was 111.7 MB. Max. memory is 7.1 GB. [2018-10-24 12:41:37,541 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 1.6 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 276.45 ms. Allocated memory is still 1.6 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 22.12 ms. Allocated memory is still 1.6 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 27.37 ms. Allocated memory is still 1.6 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 288.86 ms. Allocated memory was 1.6 GB in the beginning and 2.3 GB in the end (delta: 760.2 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -801.4 MB). Peak memory consumption was 26.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 222423.92 ms. Allocated memory was 2.3 GB in the beginning and 2.2 GB in the end (delta: -75.5 MB). Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 187.2 MB). Peak memory consumption was 111.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 216 with TraceHistMax 69,while TraceCheckSpWp was constructing backward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 114 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. TIMEOUT Result, 222.3s OverallTime, 70 OverallIterations, 69 TraceHistogramMax, 12.4s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 768 SDtfs, 2346 SDslu, 16338 SDs, 0 SdLazy, 6577 SolverSat, 99 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 8.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 17559 GetRequests, 12868 SyntacticMatches, 0 SemanticMatches, 4691 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 192.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=216occurred in iteration=69, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.1s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 69 MinimizatonAttempts, 68 StatesRemovedByMinimization, 68 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 2.5s SatisfiabilityAnalysisTime, 198.2s InterpolantComputationTime, 15163 NumberOfCodeBlocks, 15163 NumberOfCodeBlocksAsserted, 895 NumberOfCheckSat, 22531 ConstructedInterpolants, 0 QuantifiedInterpolants, 9233759 SizeOfPredicates, 67 NumberOfNonLiveVariables, 10653 ConjunctsInSsa, 2412 ConjunctsInUnsatCore, 203 InterpolantComputations, 2 PerfectInterpolantSequences, 0/464712 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown