java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT-LIM.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/Mono1_true-unreach-call1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 22:18:54,766 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 22:18:54,768 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 22:18:54,781 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 22:18:54,781 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 22:18:54,782 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 22:18:54,784 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 22:18:54,788 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 22:18:54,790 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 22:18:54,791 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 22:18:54,792 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 22:18:54,792 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 22:18:54,793 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 22:18:54,794 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 22:18:54,803 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 22:18:54,803 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 22:18:54,804 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 22:18:54,808 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 22:18:54,814 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 22:18:54,816 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 22:18:54,819 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 22:18:54,821 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 22:18:54,825 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 22:18:54,826 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 22:18:54,826 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 22:18:54,827 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 22:18:54,830 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 22:18:54,831 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 22:18:54,832 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 22:18:54,833 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 22:18:54,833 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 22:18:54,833 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-11-07 22:18:54,838 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT-LIM.epf [2018-11-07 22:18:54,866 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 22:18:54,867 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 22:18:54,867 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 22:18:54,868 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 22:18:54,868 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 22:18:54,868 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 22:18:54,868 INFO L133 SettingsManager]: * Maximum recursion depth of evaluation operations=6 [2018-11-07 22:18:54,869 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 22:18:54,869 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 22:18:54,869 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 22:18:54,869 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 22:18:54,869 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 22:18:54,869 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 22:18:54,870 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 22:18:54,870 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 22:18:54,871 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 22:18:54,871 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 22:18:54,871 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 22:18:54,871 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 22:18:54,871 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 22:18:54,872 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 22:18:54,872 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 22:18:54,872 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 22:18:54,872 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 22:18:54,872 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 22:18:54,872 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 22:18:54,874 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 22:18:54,874 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 22:18:54,874 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 22:18:54,874 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 22:18:54,875 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 22:18:54,875 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 22:18:54,875 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 22:18:54,875 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 22:18:54,875 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 22:18:54,927 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 22:18:54,943 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 22:18:54,948 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 22:18:54,950 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 22:18:54,951 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 22:18:54,951 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono1_true-unreach-call1.c [2018-11-07 22:18:55,024 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6cdded078/5b028777275b496fa251891eab93322f/FLAG28b9b2f02 [2018-11-07 22:18:55,541 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 22:18:55,542 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono1_true-unreach-call1.c [2018-11-07 22:18:55,551 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6cdded078/5b028777275b496fa251891eab93322f/FLAG28b9b2f02 [2018-11-07 22:18:55,569 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6cdded078/5b028777275b496fa251891eab93322f [2018-11-07 22:18:55,578 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 22:18:55,580 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 22:18:55,581 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 22:18:55,582 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 22:18:55,586 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 22:18:55,587 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:18:55" (1/1) ... [2018-11-07 22:18:55,590 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@59271772 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:55, skipping insertion in model container [2018-11-07 22:18:55,591 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:18:55" (1/1) ... [2018-11-07 22:18:55,601 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 22:18:55,623 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 22:18:55,825 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:18:55,829 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 22:18:55,846 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:18:55,861 INFO L193 MainTranslator]: Completed translation [2018-11-07 22:18:55,862 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:55 WrapperNode [2018-11-07 22:18:55,862 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 22:18:55,863 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 22:18:55,863 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 22:18:55,863 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 22:18:55,873 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:55" (1/1) ... [2018-11-07 22:18:55,879 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:55" (1/1) ... [2018-11-07 22:18:55,886 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 22:18:55,886 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 22:18:55,886 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 22:18:55,886 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 22:18:55,897 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:55" (1/1) ... [2018-11-07 22:18:55,898 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:55" (1/1) ... [2018-11-07 22:18:55,898 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:55" (1/1) ... [2018-11-07 22:18:55,898 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:55" (1/1) ... [2018-11-07 22:18:55,902 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:55" (1/1) ... [2018-11-07 22:18:55,907 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:55" (1/1) ... [2018-11-07 22:18:55,908 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:55" (1/1) ... [2018-11-07 22:18:55,909 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 22:18:55,910 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 22:18:55,910 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 22:18:55,910 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 22:18:55,911 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:55" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 22:18:56,041 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 22:18:56,042 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 22:18:56,042 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 22:18:56,042 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 22:18:56,042 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 22:18:56,042 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 22:18:56,043 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 22:18:56,043 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 22:18:56,249 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 22:18:56,250 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:18:56 BoogieIcfgContainer [2018-11-07 22:18:56,250 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 22:18:56,251 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 22:18:56,251 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 22:18:56,255 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 22:18:56,255 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 10:18:55" (1/3) ... [2018-11-07 22:18:56,256 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a9ea752 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:18:56, skipping insertion in model container [2018-11-07 22:18:56,256 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:55" (2/3) ... [2018-11-07 22:18:56,257 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a9ea752 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:18:56, skipping insertion in model container [2018-11-07 22:18:56,257 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:18:56" (3/3) ... [2018-11-07 22:18:56,259 INFO L112 eAbstractionObserver]: Analyzing ICFG Mono1_true-unreach-call1.c [2018-11-07 22:18:56,269 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 22:18:56,277 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 22:18:56,295 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 22:18:56,333 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 22:18:56,333 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 22:18:56,333 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 22:18:56,333 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 22:18:56,333 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 22:18:56,334 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 22:18:56,334 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 22:18:56,334 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 22:18:56,354 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-11-07 22:18:56,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-07 22:18:56,362 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:56,363 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:56,365 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:56,372 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:56,372 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-11-07 22:18:56,375 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:56,428 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:56,428 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:56,428 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:56,428 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:56,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:56,482 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:56,484 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:18:56,484 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 22:18:56,484 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:18:56,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 22:18:56,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 22:18:56,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 22:18:56,504 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-11-07 22:18:56,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:56,527 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-11-07 22:18:56,527 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 22:18:56,529 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-11-07 22:18:56,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:56,538 INFO L225 Difference]: With dead ends: 30 [2018-11-07 22:18:56,539 INFO L226 Difference]: Without dead ends: 13 [2018-11-07 22:18:56,543 INFO L604 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 [2018-11-07 22:18:56,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-11-07 22:18:56,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-11-07 22:18:56,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-11-07 22:18:56,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-11-07 22:18:56,585 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-11-07 22:18:56,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:56,585 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-11-07 22:18:56,586 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 22:18:56,586 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-11-07 22:18:56,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-07 22:18:56,587 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:56,587 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:56,587 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:56,588 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:56,588 INFO L82 PathProgramCache]: Analyzing trace with hash 1144102878, now seen corresponding path program 1 times [2018-11-07 22:18:56,588 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:56,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:56,590 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:56,590 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:56,590 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:56,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:56,746 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:56,747 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:18:56,747 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-07 22:18:56,747 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:18:56,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 22:18:56,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 22:18:56,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 22:18:56,750 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-11-07 22:18:56,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:56,854 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2018-11-07 22:18:56,855 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 22:18:56,855 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-11-07 22:18:56,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:56,856 INFO L225 Difference]: With dead ends: 24 [2018-11-07 22:18:56,857 INFO L226 Difference]: Without dead ends: 16 [2018-11-07 22:18:56,858 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 22:18:56,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-11-07 22:18:56,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-11-07 22:18:56,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-11-07 22:18:56,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2018-11-07 22:18:56,868 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2018-11-07 22:18:56,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:56,868 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2018-11-07 22:18:56,868 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 22:18:56,868 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2018-11-07 22:18:56,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-11-07 22:18:56,869 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:56,869 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:56,870 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:56,875 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:56,875 INFO L82 PathProgramCache]: Analyzing trace with hash -2056921797, now seen corresponding path program 1 times [2018-11-07 22:18:56,875 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:56,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:56,877 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:56,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:56,877 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:56,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:57,000 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:57,000 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:57,001 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:57,002 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-11-07 22:18:57,004 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [26], [29], [31], [37], [38], [39], [41] [2018-11-07 22:18:57,040 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 22:18:57,040 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 22:18:57,149 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 22:18:57,327 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 22:18:57,328 INFO L272 AbstractInterpreter]: Visited 13 different actions 69 times. Merged at 4 different actions 30 times. Widened at 1 different actions 4 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-11-07 22:18:57,375 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:57,377 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 22:18:57,378 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:57,378 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:18:57,399 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:57,399 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:18:57,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:57,436 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:57,523 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:57,524 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:57,852 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:57,874 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:57,874 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 7] total 9 [2018-11-07 22:18:57,875 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:57,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-07 22:18:57,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-07 22:18:57,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2018-11-07 22:18:57,876 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 4 states. [2018-11-07 22:18:58,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:58,013 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2018-11-07 22:18:58,014 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-07 22:18:58,014 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-11-07 22:18:58,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:58,015 INFO L225 Difference]: With dead ends: 27 [2018-11-07 22:18:58,015 INFO L226 Difference]: Without dead ends: 19 [2018-11-07 22:18:58,016 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 22 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2018-11-07 22:18:58,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-11-07 22:18:58,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-11-07 22:18:58,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-11-07 22:18:58,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-11-07 22:18:58,021 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2018-11-07 22:18:58,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:58,022 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-11-07 22:18:58,022 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-07 22:18:58,022 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-11-07 22:18:58,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-11-07 22:18:58,023 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:58,023 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:58,023 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:58,024 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:58,024 INFO L82 PathProgramCache]: Analyzing trace with hash 1670825662, now seen corresponding path program 2 times [2018-11-07 22:18:58,024 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:58,025 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:58,025 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:58,025 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:58,026 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:58,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:58,206 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:58,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:58,206 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:58,207 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:58,207 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:58,207 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:58,207 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:18:58,220 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:18:58,220 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:18:58,259 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-11-07 22:18:58,259 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:18:58,261 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:58,296 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 22:18:58,296 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:58,455 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 22:18:58,476 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-11-07 22:18:58,476 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 6] imperfect sequences [5] total 10 [2018-11-07 22:18:58,476 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:18:58,477 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 22:18:58,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 22:18:58,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2018-11-07 22:18:58,478 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 3 states. [2018-11-07 22:18:58,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:58,568 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2018-11-07 22:18:58,569 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 22:18:58,569 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-11-07 22:18:58,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:58,570 INFO L225 Difference]: With dead ends: 27 [2018-11-07 22:18:58,570 INFO L226 Difference]: Without dead ends: 22 [2018-11-07 22:18:58,571 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2018-11-07 22:18:58,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-11-07 22:18:58,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-11-07 22:18:58,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-07 22:18:58,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-11-07 22:18:58,577 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 17 [2018-11-07 22:18:58,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:58,577 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-11-07 22:18:58,577 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 22:18:58,578 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-11-07 22:18:58,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-11-07 22:18:58,578 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:58,579 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:58,579 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:58,579 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:58,580 INFO L82 PathProgramCache]: Analyzing trace with hash 1801011421, now seen corresponding path program 1 times [2018-11-07 22:18:58,580 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:58,581 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:58,581 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:18:58,581 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:58,581 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:58,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:58,713 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:58,714 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:58,714 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:58,714 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 21 with the following transitions: [2018-11-07 22:18:58,715 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-11-07 22:18:58,716 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 22:18:58,717 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 22:18:58,721 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 22:18:58,861 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 22:18:58,862 INFO L272 AbstractInterpreter]: Visited 14 different actions 87 times. Merged at 5 different actions 34 times. Widened at 2 different actions 4 times. Found 9 fixpoints after 2 different actions. Largest state had 2 variables. [2018-11-07 22:18:58,903 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:58,903 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 22:18:58,903 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:58,903 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:18:58,913 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:58,914 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:18:58,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:58,934 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:59,036 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:59,037 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:59,187 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:59,207 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:59,208 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6] total 10 [2018-11-07 22:18:59,208 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:59,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 22:18:59,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 22:18:59,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2018-11-07 22:18:59,209 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 6 states. [2018-11-07 22:18:59,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:59,592 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-11-07 22:18:59,593 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 22:18:59,593 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-11-07 22:18:59,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:59,594 INFO L225 Difference]: With dead ends: 34 [2018-11-07 22:18:59,594 INFO L226 Difference]: Without dead ends: 24 [2018-11-07 22:18:59,595 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2018-11-07 22:18:59,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-11-07 22:18:59,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-11-07 22:18:59,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-07 22:18:59,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-11-07 22:18:59,600 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 20 [2018-11-07 22:18:59,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:59,601 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-11-07 22:18:59,601 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 22:18:59,601 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-11-07 22:18:59,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-11-07 22:18:59,602 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:59,602 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:59,602 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:59,603 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:59,603 INFO L82 PathProgramCache]: Analyzing trace with hash -2092450784, now seen corresponding path program 2 times [2018-11-07 22:18:59,603 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:59,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:59,605 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:59,605 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:59,605 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:59,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:59,778 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:59,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:59,779 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:59,779 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:59,779 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:59,779 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:59,779 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:18:59,789 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:18:59,789 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:18:59,818 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 22:18:59,818 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:18:59,821 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:59,863 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-11-07 22:18:59,864 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:59,972 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-11-07 22:18:59,992 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:59,992 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 7] total 14 [2018-11-07 22:18:59,993 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:59,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 22:18:59,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 22:18:59,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2018-11-07 22:18:59,994 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 9 states. [2018-11-07 22:19:02,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:19:02,533 INFO L93 Difference]: Finished difference Result 44 states and 51 transitions. [2018-11-07 22:19:02,535 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-07 22:19:02,535 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-11-07 22:19:02,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:19:02,536 INFO L225 Difference]: With dead ends: 44 [2018-11-07 22:19:02,536 INFO L226 Difference]: Without dead ends: 34 [2018-11-07 22:19:02,537 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2018-11-07 22:19:02,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-11-07 22:19:02,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2018-11-07 22:19:02,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-07 22:19:02,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2018-11-07 22:19:02,543 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 23 [2018-11-07 22:19:02,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:19:02,544 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2018-11-07 22:19:02,544 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 22:19:02,544 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2018-11-07 22:19:02,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-11-07 22:19:02,545 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:19:02,545 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:19:02,545 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:19:02,546 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:19:02,546 INFO L82 PathProgramCache]: Analyzing trace with hash -1050905282, now seen corresponding path program 3 times [2018-11-07 22:19:02,546 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:19:02,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:02,547 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:19:02,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:02,547 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:19:02,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:02,787 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:19:02,787 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:02,787 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:19:02,787 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:19:02,788 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:19:02,788 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:02,788 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:19:02,797 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:19:02,797 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:19:02,808 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:19:02,809 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:19:02,811 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:19:02,880 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:19:02,881 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:19:03,125 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:19:03,155 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:19:03,155 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 8] total 15 [2018-11-07 22:19:03,155 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:19:03,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 22:19:03,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 22:19:03,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2018-11-07 22:19:03,157 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 9 states. [2018-11-07 22:19:03,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:19:03,254 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2018-11-07 22:19:03,254 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-07 22:19:03,255 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-11-07 22:19:03,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:19:03,256 INFO L225 Difference]: With dead ends: 46 [2018-11-07 22:19:03,256 INFO L226 Difference]: Without dead ends: 33 [2018-11-07 22:19:03,258 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2018-11-07 22:19:03,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-11-07 22:19:03,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-11-07 22:19:03,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-11-07 22:19:03,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2018-11-07 22:19:03,264 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 29 [2018-11-07 22:19:03,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:19:03,265 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2018-11-07 22:19:03,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 22:19:03,265 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2018-11-07 22:19:03,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-11-07 22:19:03,266 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:19:03,266 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:19:03,266 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:19:03,267 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:19:03,267 INFO L82 PathProgramCache]: Analyzing trace with hash -306121381, now seen corresponding path program 4 times [2018-11-07 22:19:03,267 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:19:03,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:03,268 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:19:03,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:03,268 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:19:03,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:03,527 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:19:03,528 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:03,528 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:19:03,528 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:19:03,528 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:19:03,528 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:03,528 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:19:03,541 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:19:03,541 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:19:03,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:03,570 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:19:03,628 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:19:03,628 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:19:03,894 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:19:03,915 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:19:03,915 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 9] total 17 [2018-11-07 22:19:03,915 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:19:03,915 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 22:19:03,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 22:19:03,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-11-07 22:19:03,917 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 10 states. [2018-11-07 22:19:04,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:19:04,077 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2018-11-07 22:19:04,079 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-07 22:19:04,079 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-11-07 22:19:04,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:19:04,080 INFO L225 Difference]: With dead ends: 49 [2018-11-07 22:19:04,080 INFO L226 Difference]: Without dead ends: 36 [2018-11-07 22:19:04,081 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-11-07 22:19:04,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-11-07 22:19:04,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-11-07 22:19:04,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-11-07 22:19:04,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2018-11-07 22:19:04,087 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 32 [2018-11-07 22:19:04,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:19:04,087 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2018-11-07 22:19:04,087 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 22:19:04,088 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2018-11-07 22:19:04,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-11-07 22:19:04,089 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:19:04,089 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:19:04,089 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:19:04,089 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:19:04,090 INFO L82 PathProgramCache]: Analyzing trace with hash -249977826, now seen corresponding path program 5 times [2018-11-07 22:19:04,090 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:19:04,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:04,091 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:19:04,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:04,091 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:19:04,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:04,332 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:19:04,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:04,333 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:19:04,333 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:19:04,333 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:19:04,333 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:04,333 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:19:04,343 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:19:04,343 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:19:04,357 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-11-07 22:19:04,358 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:19:04,361 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:19:04,424 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 48 proven. 7 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 22:19:04,425 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:19:04,579 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 48 proven. 7 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 22:19:04,603 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:19:04,603 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 5, 8] total 20 [2018-11-07 22:19:04,603 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:19:04,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 22:19:04,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 22:19:04,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=288, Unknown=0, NotChecked=0, Total=380 [2018-11-07 22:19:04,604 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2018-11-07 22:19:04,900 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2018-11-07 22:19:09,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:19:09,062 INFO L93 Difference]: Finished difference Result 59 states and 68 transitions. [2018-11-07 22:19:09,063 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 22:19:09,063 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2018-11-07 22:19:09,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:19:09,066 INFO L225 Difference]: With dead ends: 59 [2018-11-07 22:19:09,066 INFO L226 Difference]: Without dead ends: 46 [2018-11-07 22:19:09,067 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=115, Invalid=346, Unknown=1, NotChecked=0, Total=462 [2018-11-07 22:19:09,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-11-07 22:19:09,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 42. [2018-11-07 22:19:09,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-11-07 22:19:09,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2018-11-07 22:19:09,074 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 35 [2018-11-07 22:19:09,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:19:09,075 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2018-11-07 22:19:09,075 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 22:19:09,075 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2018-11-07 22:19:09,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-11-07 22:19:09,076 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:19:09,076 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:19:09,077 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:19:09,077 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:19:09,077 INFO L82 PathProgramCache]: Analyzing trace with hash 607533056, now seen corresponding path program 6 times [2018-11-07 22:19:09,077 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:19:09,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:09,078 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:19:09,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:09,079 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:19:09,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:09,339 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:19:09,339 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:09,339 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:19:09,340 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:19:09,340 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:19:09,340 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:09,340 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:19:09,360 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:19:09,360 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:19:09,377 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:19:09,377 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:19:09,380 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:19:09,438 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:19:09,439 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:19:09,990 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:19:10,011 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:19:10,012 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 24 [2018-11-07 22:19:10,012 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:19:10,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 22:19:10,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 22:19:10,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=385, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:19:10,013 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand 13 states. [2018-11-07 22:19:10,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:19:10,298 INFO L93 Difference]: Finished difference Result 61 states and 68 transitions. [2018-11-07 22:19:10,299 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 22:19:10,299 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-11-07 22:19:10,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:19:10,300 INFO L225 Difference]: With dead ends: 61 [2018-11-07 22:19:10,300 INFO L226 Difference]: Without dead ends: 45 [2018-11-07 22:19:10,301 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 70 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=167, Invalid=385, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:19:10,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-11-07 22:19:10,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-11-07 22:19:10,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-11-07 22:19:10,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2018-11-07 22:19:10,312 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 41 [2018-11-07 22:19:10,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:19:10,313 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2018-11-07 22:19:10,313 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 22:19:10,313 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2018-11-07 22:19:10,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-11-07 22:19:10,314 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:19:10,315 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:19:10,315 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:19:10,315 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:19:10,315 INFO L82 PathProgramCache]: Analyzing trace with hash 1655862429, now seen corresponding path program 7 times [2018-11-07 22:19:10,316 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:19:10,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:10,317 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:19:10,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:10,317 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:19:10,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:10,618 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:19:10,618 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:10,618 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:19:10,618 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:19:10,619 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:19:10,619 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:10,619 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:19:10,628 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:19:10,628 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:19:10,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:10,657 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:19:10,948 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 72 proven. 108 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-07 22:19:10,948 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:19:11,934 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 72 proven. 108 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-07 22:19:11,955 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:19:11,956 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 12] total 24 [2018-11-07 22:19:11,956 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:19:11,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 22:19:11,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 22:19:11,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:19:11,957 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand 14 states. [2018-11-07 22:19:12,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:19:12,224 INFO L93 Difference]: Finished difference Result 64 states and 71 transitions. [2018-11-07 22:19:12,224 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 22:19:12,225 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-11-07 22:19:12,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:19:12,226 INFO L225 Difference]: With dead ends: 64 [2018-11-07 22:19:12,226 INFO L226 Difference]: Without dead ends: 48 [2018-11-07 22:19:12,227 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:19:12,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-11-07 22:19:12,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-11-07 22:19:12,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-11-07 22:19:12,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2018-11-07 22:19:12,234 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 44 [2018-11-07 22:19:12,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:19:12,234 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2018-11-07 22:19:12,234 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 22:19:12,235 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2018-11-07 22:19:12,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-11-07 22:19:12,236 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:19:12,236 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:19:12,236 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:19:12,236 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:19:12,236 INFO L82 PathProgramCache]: Analyzing trace with hash -565963040, now seen corresponding path program 8 times [2018-11-07 22:19:12,237 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:19:12,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:12,238 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:19:12,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:12,238 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:19:12,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:12,565 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:19:12,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:12,565 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:19:12,565 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:19:12,566 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:19:12,566 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:12,566 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:19:12,583 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:19:12,583 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:19:12,602 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 22:19:12,602 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:19:12,604 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:19:12,870 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 99 proven. 15 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-11-07 22:19:12,870 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:19:13,104 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 99 proven. 15 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-11-07 22:19:13,126 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:19:13,127 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 6, 9] total 26 [2018-11-07 22:19:13,127 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:19:13,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 22:19:13,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 22:19:13,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=496, Unknown=0, NotChecked=0, Total=650 [2018-11-07 22:19:13,128 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 19 states. [2018-11-07 22:19:15,867 WARN L179 SmtUtils]: Spent 2.28 s on a formula simplification. DAG size of input: 20 DAG size of output: 12 [2018-11-07 22:19:22,057 WARN L179 SmtUtils]: Spent 1.05 s on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2018-11-07 22:19:26,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:19:26,338 INFO L93 Difference]: Finished difference Result 80 states and 93 transitions. [2018-11-07 22:19:26,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 22:19:26,338 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 47 [2018-11-07 22:19:26,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:19:26,339 INFO L225 Difference]: With dead ends: 80 [2018-11-07 22:19:26,340 INFO L226 Difference]: Without dead ends: 64 [2018-11-07 22:19:26,341 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 85 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=239, Invalid=690, Unknown=1, NotChecked=0, Total=930 [2018-11-07 22:19:26,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-11-07 22:19:26,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 54. [2018-11-07 22:19:26,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-11-07 22:19:26,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2018-11-07 22:19:26,348 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 47 [2018-11-07 22:19:26,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:19:26,349 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2018-11-07 22:19:26,349 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 22:19:26,349 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2018-11-07 22:19:26,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-11-07 22:19:26,350 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:19:26,350 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:19:26,351 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:19:26,351 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:19:26,351 INFO L82 PathProgramCache]: Analyzing trace with hash -829748866, now seen corresponding path program 9 times [2018-11-07 22:19:26,351 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:19:26,352 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:26,352 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:19:26,352 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:26,352 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:19:26,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:26,806 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 28 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:19:26,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:26,807 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:19:26,807 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:19:26,807 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:19:26,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:26,807 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:19:26,824 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:19:26,824 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:19:26,855 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:19:26,856 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:19:26,858 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:19:26,906 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 165 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 22:19:26,906 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:19:27,474 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 165 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 22:19:27,494 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:19:27,494 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13, 14] total 29 [2018-11-07 22:19:27,494 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:19:27,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-07 22:19:27,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-07 22:19:27,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=562, Unknown=0, NotChecked=0, Total=812 [2018-11-07 22:19:27,496 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand 17 states. [2018-11-07 22:19:27,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:19:27,852 INFO L93 Difference]: Finished difference Result 79 states and 89 transitions. [2018-11-07 22:19:27,853 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 22:19:27,853 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-11-07 22:19:27,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:19:27,854 INFO L225 Difference]: With dead ends: 79 [2018-11-07 22:19:27,854 INFO L226 Difference]: Without dead ends: 60 [2018-11-07 22:19:27,855 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 93 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=250, Invalid=562, Unknown=0, NotChecked=0, Total=812 [2018-11-07 22:19:27,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-11-07 22:19:27,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-11-07 22:19:27,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-11-07 22:19:27,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2018-11-07 22:19:27,862 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 53 [2018-11-07 22:19:27,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:19:27,863 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2018-11-07 22:19:27,863 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-07 22:19:27,863 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2018-11-07 22:19:27,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-11-07 22:19:27,864 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:19:27,864 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:19:27,864 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:19:27,864 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:19:27,865 INFO L82 PathProgramCache]: Analyzing trace with hash 794925150, now seen corresponding path program 10 times [2018-11-07 22:19:27,865 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:19:27,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:27,866 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:19:27,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:27,866 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:19:27,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:28,614 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 32 proven. 360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:19:28,614 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:28,614 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:19:28,614 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:19:28,614 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:19:28,614 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:28,615 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:19:28,626 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:19:28,626 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:19:28,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:28,645 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:19:28,890 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 143 proven. 234 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 22:19:28,891 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:19:29,746 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 143 proven. 234 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 22:19:29,767 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:19:29,767 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 15, 16] total 33 [2018-11-07 22:19:29,767 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:19:29,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 22:19:29,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 22:19:29,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=738, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 22:19:29,769 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand 19 states. [2018-11-07 22:19:30,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:19:30,139 INFO L93 Difference]: Finished difference Result 85 states and 95 transitions. [2018-11-07 22:19:30,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 22:19:30,140 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-11-07 22:19:30,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:19:30,141 INFO L225 Difference]: With dead ends: 85 [2018-11-07 22:19:30,141 INFO L226 Difference]: Without dead ends: 66 [2018-11-07 22:19:30,142 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 103 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=318, Invalid=738, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 22:19:30,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-11-07 22:19:30,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-11-07 22:19:30,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-11-07 22:19:30,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2018-11-07 22:19:30,151 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 59 [2018-11-07 22:19:30,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:19:30,151 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2018-11-07 22:19:30,152 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 22:19:30,152 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2018-11-07 22:19:30,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-11-07 22:19:30,153 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:19:30,153 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 14, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:19:30,153 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:19:30,153 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:19:30,154 INFO L82 PathProgramCache]: Analyzing trace with hash 369721150, now seen corresponding path program 11 times [2018-11-07 22:19:30,154 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:19:30,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:30,155 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:19:30,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:30,155 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:19:30,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:30,759 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 36 proven. 459 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:19:30,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:30,759 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:19:30,760 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:19:30,760 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:19:30,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:30,760 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:19:30,769 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:19:30,770 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:19:30,789 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-11-07 22:19:30,789 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:19:30,792 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:19:30,932 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 26 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-11-07 22:19:30,932 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:19:31,310 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 26 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-11-07 22:19:31,331 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:19:31,331 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 7, 10] total 34 [2018-11-07 22:19:31,331 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:19:31,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-07 22:19:31,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-07 22:19:31,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=853, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 22:19:31,333 INFO L87 Difference]: Start difference. First operand 66 states and 70 transitions. Second operand 26 states. [2018-11-07 22:19:36,875 WARN L179 SmtUtils]: Spent 2.28 s on a formula simplification. DAG size of input: 24 DAG size of output: 12 [2018-11-07 22:19:48,082 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2018-11-07 22:19:50,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:19:50,323 INFO L93 Difference]: Finished difference Result 98 states and 112 transitions. [2018-11-07 22:19:50,324 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-07 22:19:50,324 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 65 [2018-11-07 22:19:50,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:19:50,326 INFO L225 Difference]: With dead ends: 98 [2018-11-07 22:19:50,326 INFO L226 Difference]: Without dead ends: 79 [2018-11-07 22:19:50,328 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 120 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=379, Invalid=1103, Unknown=0, NotChecked=0, Total=1482 [2018-11-07 22:19:50,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-11-07 22:19:50,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 75. [2018-11-07 22:19:50,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-11-07 22:19:50,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 80 transitions. [2018-11-07 22:19:50,338 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 80 transitions. Word has length 65 [2018-11-07 22:19:50,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:19:50,339 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 80 transitions. [2018-11-07 22:19:50,339 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-07 22:19:50,339 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 80 transitions. [2018-11-07 22:19:50,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-11-07 22:19:50,340 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:19:50,341 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:19:50,341 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:19:50,341 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:19:50,341 INFO L82 PathProgramCache]: Analyzing trace with hash 10718589, now seen corresponding path program 12 times [2018-11-07 22:19:50,341 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:19:50,342 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:50,342 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:19:50,343 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:50,343 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:19:50,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:51,077 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:19:51,078 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:51,078 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:19:51,078 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:19:51,078 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:19:51,078 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:51,079 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:19:51,087 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:19:51,088 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:19:51,119 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:19:51,119 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:19:51,122 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:19:51,251 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 100 proven. 570 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:19:51,252 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:19:53,238 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 100 proven. 570 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:19:53,259 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:19:53,259 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 22, 23] total 45 [2018-11-07 22:19:53,259 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:19:53,259 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-07 22:19:53,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-07 22:19:53,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2018-11-07 22:19:53,261 INFO L87 Difference]: Start difference. First operand 75 states and 80 transitions. Second operand 24 states. [2018-11-07 22:19:53,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:19:53,864 INFO L93 Difference]: Finished difference Result 100 states and 111 transitions. [2018-11-07 22:19:53,865 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 22:19:53,865 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 74 [2018-11-07 22:19:53,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:19:53,866 INFO L225 Difference]: With dead ends: 100 [2018-11-07 22:19:53,866 INFO L226 Difference]: Without dead ends: 78 [2018-11-07 22:19:53,867 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 126 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2018-11-07 22:19:53,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-11-07 22:19:53,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2018-11-07 22:19:53,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-11-07 22:19:53,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 83 transitions. [2018-11-07 22:19:53,875 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 83 transitions. Word has length 74 [2018-11-07 22:19:53,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:19:53,875 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 83 transitions. [2018-11-07 22:19:53,875 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-07 22:19:53,875 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 83 transitions. [2018-11-07 22:19:53,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-11-07 22:19:53,876 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:19:53,877 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 17, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:19:53,877 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:19:53,877 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:19:53,877 INFO L82 PathProgramCache]: Analyzing trace with hash 1880758400, now seen corresponding path program 13 times [2018-11-07 22:19:53,877 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:19:53,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:53,878 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:19:53,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:53,878 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:19:53,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:54,421 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:19:54,421 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:54,421 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:19:54,421 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:19:54,421 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:19:54,421 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:54,422 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:19:54,431 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:19:54,431 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:19:54,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:54,453 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:19:54,540 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 252 proven. 459 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-07 22:19:54,540 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:19:57,030 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 252 proven. 459 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-07 22:19:57,051 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:19:57,051 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 20, 21] total 44 [2018-11-07 22:19:57,051 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:19:57,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-07 22:19:57,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-07 22:19:57,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=523, Invalid=1369, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 22:19:57,052 INFO L87 Difference]: Start difference. First operand 78 states and 83 transitions. Second operand 25 states. [2018-11-07 22:19:58,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:19:58,048 INFO L93 Difference]: Finished difference Result 103 states and 114 transitions. [2018-11-07 22:19:58,048 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-07 22:19:58,048 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 77 [2018-11-07 22:19:58,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:19:58,049 INFO L225 Difference]: With dead ends: 103 [2018-11-07 22:19:58,050 INFO L226 Difference]: Without dead ends: 81 [2018-11-07 22:19:58,052 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 134 SyntacticMatches, 3 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=523, Invalid=1369, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 22:19:58,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-11-07 22:19:58,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2018-11-07 22:19:58,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-11-07 22:19:58,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 86 transitions. [2018-11-07 22:19:58,061 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 86 transitions. Word has length 77 [2018-11-07 22:19:58,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:19:58,061 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 86 transitions. [2018-11-07 22:19:58,061 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-07 22:19:58,061 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 86 transitions. [2018-11-07 22:19:58,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-11-07 22:19:58,062 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:19:58,062 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 18, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:19:58,063 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:19:58,063 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:19:58,063 INFO L82 PathProgramCache]: Analyzing trace with hash -2078995811, now seen corresponding path program 14 times [2018-11-07 22:19:58,063 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:19:58,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:58,064 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:19:58,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:58,064 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:19:58,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:58,604 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:19:58,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:58,604 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:19:58,604 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:19:58,604 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:19:58,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:58,604 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:19:58,613 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:19:58,614 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:19:58,642 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 22:19:58,642 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:19:58,644 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:19:58,885 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 306 proven. 40 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2018-11-07 22:19:58,886 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:19:59,938 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 306 proven. 40 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2018-11-07 22:19:59,959 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:19:59,959 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 8, 11] total 41 [2018-11-07 22:19:59,959 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:19:59,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-11-07 22:19:59,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-11-07 22:19:59,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=368, Invalid=1272, Unknown=0, NotChecked=0, Total=1640 [2018-11-07 22:19:59,961 INFO L87 Difference]: Start difference. First operand 81 states and 86 transitions. Second operand 32 states. [2018-11-07 22:20:09,995 WARN L179 SmtUtils]: Spent 2.81 s on a formula simplification. DAG size of input: 28 DAG size of output: 12 [2018-11-07 22:20:37,998 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2018-11-07 22:20:42,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:20:42,170 INFO L93 Difference]: Finished difference Result 116 states and 132 transitions. [2018-11-07 22:20:42,170 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-07 22:20:42,170 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 80 [2018-11-07 22:20:42,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:20:42,171 INFO L225 Difference]: With dead ends: 116 [2018-11-07 22:20:42,171 INFO L226 Difference]: Without dead ends: 94 [2018-11-07 22:20:42,173 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 149 SyntacticMatches, 5 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 32.0s TimeCoverageRelationStatistics Valid=526, Invalid=1626, Unknown=10, NotChecked=0, Total=2162 [2018-11-07 22:20:42,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-11-07 22:20:42,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 87. [2018-11-07 22:20:42,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-11-07 22:20:42,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 93 transitions. [2018-11-07 22:20:42,181 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 93 transitions. Word has length 80 [2018-11-07 22:20:42,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:20:42,181 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 93 transitions. [2018-11-07 22:20:42,182 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-11-07 22:20:42,182 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 93 transitions. [2018-11-07 22:20:42,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-11-07 22:20:42,183 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:20:42,183 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 19, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:20:42,183 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:20:42,183 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:20:42,183 INFO L82 PathProgramCache]: Analyzing trace with hash 59221243, now seen corresponding path program 15 times [2018-11-07 22:20:42,184 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:20:42,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:20:42,184 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:20:42,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:20:42,184 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:20:42,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:20:42,882 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 50 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:20:42,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:20:42,883 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:20:42,883 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:20:42,883 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:20:42,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:20:42,883 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:20:42,892 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:20:42,892 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:20:42,914 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:20:42,914 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:20:42,916 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:20:42,968 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 340 proven. 570 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 22:20:42,968 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:20:44,822 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 340 proven. 570 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 22:20:44,841 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:20:44,841 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 22, 23] total 49 [2018-11-07 22:20:44,841 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:20:44,842 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-07 22:20:44,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-07 22:20:44,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=667, Invalid=1685, Unknown=0, NotChecked=0, Total=2352 [2018-11-07 22:20:44,843 INFO L87 Difference]: Start difference. First operand 87 states and 93 transitions. Second operand 28 states. [2018-11-07 22:20:45,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:20:45,569 INFO L93 Difference]: Finished difference Result 118 states and 132 transitions. [2018-11-07 22:20:45,575 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-07 22:20:45,575 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 86 [2018-11-07 22:20:45,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:20:45,576 INFO L225 Difference]: With dead ends: 118 [2018-11-07 22:20:45,576 INFO L226 Difference]: Without dead ends: 93 [2018-11-07 22:20:45,577 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 150 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=667, Invalid=1685, Unknown=0, NotChecked=0, Total=2352 [2018-11-07 22:20:45,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-11-07 22:20:45,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2018-11-07 22:20:45,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-11-07 22:20:45,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 99 transitions. [2018-11-07 22:20:45,583 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 99 transitions. Word has length 86 [2018-11-07 22:20:45,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:20:45,583 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 99 transitions. [2018-11-07 22:20:45,583 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-07 22:20:45,584 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 99 transitions. [2018-11-07 22:20:45,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-11-07 22:20:45,584 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:20:45,584 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 21, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:20:45,585 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:20:45,585 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:20:45,585 INFO L82 PathProgramCache]: Analyzing trace with hash -1341754853, now seen corresponding path program 16 times [2018-11-07 22:20:45,585 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:20:45,586 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:20:45,586 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:20:45,586 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:20:45,586 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:20:45,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:20:46,576 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 54 proven. 1053 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:20:46,576 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:20:46,576 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:20:46,576 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:20:46,576 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:20:46,577 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:20:46,577 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:20:46,586 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:20:46,586 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:20:46,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:20:46,606 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:20:46,798 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 374 proven. 693 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 22:20:46,798 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:20:50,117 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 374 proven. 693 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 22:20:50,136 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:20:50,136 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 24, 25] total 53 [2018-11-07 22:20:50,137 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:20:50,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-11-07 22:20:50,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-11-07 22:20:50,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=775, Invalid=1981, Unknown=0, NotChecked=0, Total=2756 [2018-11-07 22:20:50,138 INFO L87 Difference]: Start difference. First operand 93 states and 99 transitions. Second operand 30 states. [2018-11-07 22:20:50,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:20:50,960 INFO L93 Difference]: Finished difference Result 124 states and 138 transitions. [2018-11-07 22:20:50,960 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-07 22:20:50,961 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 92 [2018-11-07 22:20:50,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:20:50,962 INFO L225 Difference]: With dead ends: 124 [2018-11-07 22:20:50,962 INFO L226 Difference]: Without dead ends: 99 [2018-11-07 22:20:50,964 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 160 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=775, Invalid=1981, Unknown=0, NotChecked=0, Total=2756 [2018-11-07 22:20:50,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-11-07 22:20:50,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2018-11-07 22:20:50,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-11-07 22:20:50,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 105 transitions. [2018-11-07 22:20:50,973 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 105 transitions. Word has length 92 [2018-11-07 22:20:50,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:20:50,973 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 105 transitions. [2018-11-07 22:20:50,973 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-11-07 22:20:50,974 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 105 transitions. [2018-11-07 22:20:50,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-11-07 22:20:50,974 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:20:50,975 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 23, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:20:50,975 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:20:50,975 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:20:50,975 INFO L82 PathProgramCache]: Analyzing trace with hash -2143361221, now seen corresponding path program 17 times [2018-11-07 22:20:50,975 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:20:50,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:20:50,976 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:20:50,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:20:50,976 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:20:50,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:20:52,080 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 58 proven. 1218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:20:52,081 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:20:52,081 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:20:52,081 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:20:52,081 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:20:52,081 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:20:52,081 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:20:52,089 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:20:52,089 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:21:32,535 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-11-07 22:21:32,535 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:21:32,640 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:21:32,935 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 460 proven. 57 refuted. 0 times theorem prover too weak. 759 trivial. 0 not checked. [2018-11-07 22:21:32,935 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:21:33,466 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 460 proven. 57 refuted. 0 times theorem prover too weak. 759 trivial. 0 not checked. [2018-11-07 22:21:33,487 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:21:33,487 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 9, 12] total 49 [2018-11-07 22:21:33,487 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:21:33,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-11-07 22:21:33,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-11-07 22:21:33,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=538, Invalid=1814, Unknown=0, NotChecked=0, Total=2352 [2018-11-07 22:21:33,489 INFO L87 Difference]: Start difference. First operand 99 states and 105 transitions. Second operand 39 states. [2018-11-07 22:21:44,361 WARN L179 SmtUtils]: Spent 4.25 s on a formula simplification. DAG size of input: 32 DAG size of output: 12 [2018-11-07 22:21:54,940 WARN L179 SmtUtils]: Spent 775.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 12 [2018-11-07 22:22:28,407 WARN L179 SmtUtils]: Spent 6.17 s on a formula simplification. DAG size of input: 24 DAG size of output: 12 [2018-11-07 22:23:10,117 WARN L179 SmtUtils]: Spent 4.24 s on a formula simplification. DAG size of input: 24 DAG size of output: 12 [2018-11-07 22:23:10,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:23:10,149 INFO L93 Difference]: Finished difference Result 143 states and 163 transitions. [2018-11-07 22:23:10,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-11-07 22:23:10,150 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 98 [2018-11-07 22:23:10,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:23:10,151 INFO L225 Difference]: With dead ends: 143 [2018-11-07 22:23:10,151 INFO L226 Difference]: Without dead ends: 118 [2018-11-07 22:23:10,152 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 185 SyntacticMatches, 6 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 72.5s TimeCoverageRelationStatistics Valid=836, Invalid=2465, Unknown=5, NotChecked=0, Total=3306 [2018-11-07 22:23:10,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-11-07 22:23:10,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 108. [2018-11-07 22:23:10,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-11-07 22:23:10,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 115 transitions. [2018-11-07 22:23:10,160 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 115 transitions. Word has length 98 [2018-11-07 22:23:10,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:23:10,160 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 115 transitions. [2018-11-07 22:23:10,161 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-11-07 22:23:10,161 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 115 transitions. [2018-11-07 22:23:10,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-11-07 22:23:10,162 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:23:10,162 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 25, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:23:10,162 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:23:10,162 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:23:10,162 INFO L82 PathProgramCache]: Analyzing trace with hash 1159676448, now seen corresponding path program 18 times [2018-11-07 22:23:10,162 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:23:10,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:23:10,163 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:23:10,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:23:10,163 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:23:10,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:23:11,490 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 155 proven. 1395 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:23:11,490 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:23:11,490 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:23:11,490 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:23:11,490 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:23:11,490 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:23:11,490 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:23:11,500 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:23:11,501 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:23:11,526 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:23:11,526 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:23:11,529 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:23:11,608 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 520 proven. 975 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-07 22:23:11,609 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:23:15,039 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 520 proven. 975 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-07 22:23:15,058 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:23:15,058 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 28, 29] total 61 [2018-11-07 22:23:15,058 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:23:15,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-11-07 22:23:15,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-11-07 22:23:15,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1015, Invalid=2645, Unknown=0, NotChecked=0, Total=3660 [2018-11-07 22:23:15,060 INFO L87 Difference]: Start difference. First operand 108 states and 115 transitions. Second operand 34 states. [2018-11-07 22:23:16,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:23:16,106 INFO L93 Difference]: Finished difference Result 142 states and 158 transitions. [2018-11-07 22:23:16,110 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-07 22:23:16,110 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 107 [2018-11-07 22:23:16,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:23:16,112 INFO L225 Difference]: With dead ends: 142 [2018-11-07 22:23:16,112 INFO L226 Difference]: Without dead ends: 114 [2018-11-07 22:23:16,113 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 186 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=1015, Invalid=2645, Unknown=0, NotChecked=0, Total=3660 [2018-11-07 22:23:16,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-11-07 22:23:16,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2018-11-07 22:23:16,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-11-07 22:23:16,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 121 transitions. [2018-11-07 22:23:16,122 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 121 transitions. Word has length 107 [2018-11-07 22:23:16,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:23:16,122 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 121 transitions. [2018-11-07 22:23:16,122 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-11-07 22:23:16,122 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 121 transitions. [2018-11-07 22:23:16,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-11-07 22:23:16,123 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:23:16,123 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 27, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:23:16,123 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:23:16,123 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:23:16,124 INFO L82 PathProgramCache]: Analyzing trace with hash -628496128, now seen corresponding path program 19 times [2018-11-07 22:23:16,124 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:23:16,124 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:23:16,124 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:23:16,124 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:23:16,124 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:23:16,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:23:16,937 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 165 proven. 1584 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:23:16,938 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:23:16,938 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:23:16,938 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:23:16,938 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:23:16,938 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:23:16,938 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:23:16,956 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:23:16,956 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:23:16,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:23:16,985 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:23:17,038 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 560 proven. 1134 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-07 22:23:17,038 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:23:20,600 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 560 proven. 1134 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-07 22:23:20,619 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:23:20,619 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 30, 31] total 65 [2018-11-07 22:23:20,620 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:23:20,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-11-07 22:23:20,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-11-07 22:23:20,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1147, Invalid=3013, Unknown=0, NotChecked=0, Total=4160 [2018-11-07 22:23:20,622 INFO L87 Difference]: Start difference. First operand 114 states and 121 transitions. Second operand 36 states. [2018-11-07 22:23:21,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:23:21,796 INFO L93 Difference]: Finished difference Result 148 states and 164 transitions. [2018-11-07 22:23:21,797 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-11-07 22:23:21,797 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 113 [2018-11-07 22:23:21,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:23:21,798 INFO L225 Difference]: With dead ends: 148 [2018-11-07 22:23:21,799 INFO L226 Difference]: Without dead ends: 120 [2018-11-07 22:23:21,801 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 196 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=1147, Invalid=3013, Unknown=0, NotChecked=0, Total=4160 [2018-11-07 22:23:21,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-11-07 22:23:21,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2018-11-07 22:23:21,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-11-07 22:23:21,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 127 transitions. [2018-11-07 22:23:21,813 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 127 transitions. Word has length 113 [2018-11-07 22:23:21,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:23:21,813 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 127 transitions. [2018-11-07 22:23:21,813 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-11-07 22:23:21,813 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 127 transitions. [2018-11-07 22:23:21,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-11-07 22:23:21,814 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:23:21,814 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 29, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:23:21,814 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:23:21,814 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:23:21,814 INFO L82 PathProgramCache]: Analyzing trace with hash -866916384, now seen corresponding path program 20 times [2018-11-07 22:23:21,815 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:23:21,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:23:21,815 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:23:21,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:23:21,815 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:23:21,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:23:22,573 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 175 proven. 1785 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:23:22,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:23:22,573 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:23:22,573 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:23:22,573 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:23:22,574 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:23:22,574 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:23:22,582 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:23:22,582 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown