java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call3_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:05:21,908 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:05:21,910 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:05:21,923 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:05:21,923 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:05:21,924 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:05:21,925 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:05:21,927 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:05:21,929 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:05:21,930 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:05:21,931 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:05:21,931 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:05:21,932 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:05:21,933 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:05:21,934 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:05:21,935 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:05:21,936 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:05:21,940 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:05:21,946 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:05:21,947 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:05:21,949 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:05:21,950 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:05:21,952 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-22 16:05:21,961 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-22 16:05:21,984 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:05:21,985 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:05:21,986 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:05:21,987 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:05:21,987 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:05:21,987 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:05:21,987 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:05:21,988 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:05:21,988 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:05:21,988 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:05:21,988 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:05:21,989 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:05:21,989 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:05:21,990 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:05:21,990 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:05:21,990 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:05:21,990 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:05:21,990 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:05:21,991 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:05:21,992 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:05:21,993 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:05:21,993 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:05:21,993 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:05:21,993 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:05:21,993 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:05:21,994 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:05:21,994 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:05:21,994 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:05:21,995 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:05:21,995 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:05:21,995 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:05:21,995 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:05:21,995 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:05:21,996 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:05:22,042 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:05:22,059 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:05:22,064 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:05:22,066 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:05:22,066 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:05:22,067 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call3_true-termination.i [2018-10-22 16:05:22,132 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/253731bc8/6a9d87c0196e4252aca984e551ca2b9d/FLAGcfe0c4ef6 [2018-10-22 16:05:22,640 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:05:22,641 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call3_true-termination.i [2018-10-22 16:05:22,648 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/253731bc8/6a9d87c0196e4252aca984e551ca2b9d/FLAGcfe0c4ef6 [2018-10-22 16:05:22,665 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/253731bc8/6a9d87c0196e4252aca984e551ca2b9d [2018-10-22 16:05:22,677 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:05:22,680 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:05:22,681 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:05:22,681 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:05:22,686 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:05:22,687 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:05:22" (1/1) ... [2018-10-22 16:05:22,691 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@28a8effd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:22, skipping insertion in model container [2018-10-22 16:05:22,691 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:05:22" (1/1) ... [2018-10-22 16:05:22,702 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:05:22,724 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:05:22,923 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:05:22,927 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:05:22,953 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:05:22,981 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:05:22,982 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:22 WrapperNode [2018-10-22 16:05:22,982 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:05:22,983 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:05:22,983 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:05:22,983 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:05:22,995 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:22" (1/1) ... [2018-10-22 16:05:23,006 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:22" (1/1) ... [2018-10-22 16:05:23,034 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:05:23,035 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:05:23,036 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:05:23,036 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:05:23,047 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:22" (1/1) ... [2018-10-22 16:05:23,047 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:22" (1/1) ... [2018-10-22 16:05:23,053 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:22" (1/1) ... [2018-10-22 16:05:23,055 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:22" (1/1) ... [2018-10-22 16:05:23,061 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:22" (1/1) ... [2018-10-22 16:05:23,074 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:22" (1/1) ... [2018-10-22 16:05:23,077 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:22" (1/1) ... [2018-10-22 16:05:23,086 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:05:23,087 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:05:23,087 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:05:23,087 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:05:23,088 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:22" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:05:23,280 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:05:23,280 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:05:23,280 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:05:23,280 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:05:23,280 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:05:23,281 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:05:23,281 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:05:23,281 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:05:23,604 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:05:23,605 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:05:23 BoogieIcfgContainer [2018-10-22 16:05:23,605 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:05:23,606 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:05:23,606 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:05:23,610 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:05:23,610 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:05:22" (1/3) ... [2018-10-22 16:05:23,611 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1db169d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:05:23, skipping insertion in model container [2018-10-22 16:05:23,611 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:05:22" (2/3) ... [2018-10-22 16:05:23,612 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1db169d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:05:23, skipping insertion in model container [2018-10-22 16:05:23,612 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:05:23" (3/3) ... [2018-10-22 16:05:23,615 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_array_index_value_true-unreach-call3_true-termination.i [2018-10-22 16:05:23,627 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:05:23,638 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:05:23,669 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:05:23,714 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:05:23,715 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:05:23,715 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:05:23,716 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:05:23,716 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:05:23,716 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:05:23,716 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:05:23,716 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:05:23,716 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:05:23,739 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2018-10-22 16:05:23,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-22 16:05:23,749 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:23,750 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:23,753 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:23,763 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:23,764 INFO L82 PathProgramCache]: Analyzing trace with hash 974464032, now seen corresponding path program 1 times [2018-10-22 16:05:23,767 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:23,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:23,825 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:23,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:23,825 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:23,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:23,925 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:23,928 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:05:23,928 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:05:23,928 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:05:23,933 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:05:23,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:05:23,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:05:23,952 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 2 states. [2018-10-22 16:05:23,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:23,979 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2018-10-22 16:05:23,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:05:23,981 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-10-22 16:05:23,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:23,991 INFO L225 Difference]: With dead ends: 44 [2018-10-22 16:05:23,992 INFO L226 Difference]: Without dead ends: 21 [2018-10-22 16:05:23,998 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:05:24,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-22 16:05:24,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-10-22 16:05:24,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-22 16:05:24,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2018-10-22 16:05:24,040 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 15 [2018-10-22 16:05:24,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:24,041 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2018-10-22 16:05:24,042 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:05:24,043 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2018-10-22 16:05:24,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-22 16:05:24,044 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:24,044 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:24,044 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:24,045 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:24,045 INFO L82 PathProgramCache]: Analyzing trace with hash 984975661, now seen corresponding path program 1 times [2018-10-22 16:05:24,045 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:24,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:24,047 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:24,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:24,047 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:24,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:24,176 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:24,176 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:05:24,176 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 16:05:24,180 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:05:24,183 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:05:24,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:05:24,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:05:24,189 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 3 states. [2018-10-22 16:05:24,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:24,286 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2018-10-22 16:05:24,287 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:05:24,287 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2018-10-22 16:05:24,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:24,290 INFO L225 Difference]: With dead ends: 42 [2018-10-22 16:05:24,290 INFO L226 Difference]: Without dead ends: 29 [2018-10-22 16:05:24,291 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:05:24,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-22 16:05:24,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 23. [2018-10-22 16:05:24,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-22 16:05:24,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2018-10-22 16:05:24,301 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 16 [2018-10-22 16:05:24,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:24,302 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2018-10-22 16:05:24,302 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:05:24,302 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2018-10-22 16:05:24,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-22 16:05:24,303 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:24,303 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:24,303 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:24,303 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:24,303 INFO L82 PathProgramCache]: Analyzing trace with hash 1246878611, now seen corresponding path program 1 times [2018-10-22 16:05:24,304 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:24,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:24,305 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:24,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:24,305 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:24,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:24,477 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:24,478 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:24,482 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:24,483 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-10-22 16:05:24,485 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [13], [15], [19], [23], [28], [33], [44], [47], [49], [55], [56], [57], [59] [2018-10-22 16:05:24,533 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:05:24,534 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:05:24,717 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:05:27,448 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:05:27,450 INFO L272 AbstractInterpreter]: Visited 17 different actions 317 times. Merged at 7 different actions 192 times. Widened at 2 different actions 48 times. Found 3 fixpoints after 2 different actions. Largest state had 31 variables. [2018-10-22 16:05:27,494 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:27,496 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:05:27,496 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:27,497 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:27,513 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:27,514 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:05:27,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:27,576 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:27,719 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:27,719 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:28,011 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:28,045 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:28,045 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:28,069 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:28,070 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:05:28,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:28,139 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:28,268 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:28,268 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:28,324 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:28,326 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:28,327 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-10-22 16:05:28,327 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:28,327 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-22 16:05:28,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-22 16:05:28,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:05:28,328 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 4 states. [2018-10-22 16:05:28,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:28,578 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2018-10-22 16:05:28,580 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-22 16:05:28,580 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2018-10-22 16:05:28,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:28,581 INFO L225 Difference]: With dead ends: 50 [2018-10-22 16:05:28,581 INFO L226 Difference]: Without dead ends: 37 [2018-10-22 16:05:28,582 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 66 SyntacticMatches, 4 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:05:28,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-22 16:05:28,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 25. [2018-10-22 16:05:28,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-22 16:05:28,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2018-10-22 16:05:28,588 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 18 [2018-10-22 16:05:28,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:28,588 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2018-10-22 16:05:28,589 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-22 16:05:28,589 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2018-10-22 16:05:28,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-22 16:05:28,589 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:28,590 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:28,590 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:28,590 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:28,590 INFO L82 PathProgramCache]: Analyzing trace with hash -467456903, now seen corresponding path program 2 times [2018-10-22 16:05:28,591 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:28,591 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:28,592 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:28,592 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:28,592 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:28,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:28,803 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:28,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:28,803 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:28,804 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:28,804 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:28,804 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:28,804 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:28,821 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:05:28,821 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:28,877 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:05:28,877 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:28,880 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:28,963 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:28,964 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:29,101 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:29,130 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:29,130 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:29,152 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:05:29,152 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:29,230 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:05:29,230 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:29,236 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:29,278 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:29,279 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:29,301 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:29,303 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:29,303 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-10-22 16:05:29,304 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:29,304 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 16:05:29,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 16:05:29,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:05:29,305 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2018-10-22 16:05:29,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:29,559 INFO L93 Difference]: Finished difference Result 58 states and 68 transitions. [2018-10-22 16:05:29,564 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 16:05:29,564 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2018-10-22 16:05:29,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:29,566 INFO L225 Difference]: With dead ends: 58 [2018-10-22 16:05:29,566 INFO L226 Difference]: Without dead ends: 45 [2018-10-22 16:05:29,567 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 73 SyntacticMatches, 4 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:05:29,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-22 16:05:29,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 27. [2018-10-22 16:05:29,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-22 16:05:29,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2018-10-22 16:05:29,576 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 20 [2018-10-22 16:05:29,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:29,578 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2018-10-22 16:05:29,578 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 16:05:29,578 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2018-10-22 16:05:29,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-22 16:05:29,579 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:29,579 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:29,579 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:29,579 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:29,580 INFO L82 PathProgramCache]: Analyzing trace with hash 1323555807, now seen corresponding path program 3 times [2018-10-22 16:05:29,581 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:29,581 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:29,582 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:29,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:29,582 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:29,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:29,868 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:29,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:29,868 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:29,869 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:29,869 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:29,869 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:29,869 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:29,892 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:05:29,892 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:05:29,980 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:05:29,980 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:29,983 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:30,079 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:30,079 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:30,211 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:30,232 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:30,233 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:30,249 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:05:30,249 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:05:30,382 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:05:30,382 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:30,388 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:30,498 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:30,498 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:30,516 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:30,518 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:30,519 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-10-22 16:05:30,519 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:30,519 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 16:05:30,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 16:05:30,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:05:30,520 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 6 states. [2018-10-22 16:05:30,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:30,709 INFO L93 Difference]: Finished difference Result 66 states and 78 transitions. [2018-10-22 16:05:30,712 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 16:05:30,712 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2018-10-22 16:05:30,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:30,713 INFO L225 Difference]: With dead ends: 66 [2018-10-22 16:05:30,713 INFO L226 Difference]: Without dead ends: 53 [2018-10-22 16:05:30,713 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 80 SyntacticMatches, 4 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:05:30,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-10-22 16:05:30,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 29. [2018-10-22 16:05:30,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-22 16:05:30,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2018-10-22 16:05:30,719 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 22 [2018-10-22 16:05:30,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:30,720 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2018-10-22 16:05:30,720 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 16:05:30,720 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2018-10-22 16:05:30,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-22 16:05:30,721 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:30,721 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:30,721 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:30,721 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:30,721 INFO L82 PathProgramCache]: Analyzing trace with hash 204884421, now seen corresponding path program 4 times [2018-10-22 16:05:30,722 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:30,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:30,722 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:30,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:30,723 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:30,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:30,872 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:30,873 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:30,873 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:30,873 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:30,874 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:30,874 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:30,874 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:30,887 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:05:30,887 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:05:30,923 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:05:30,923 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:30,925 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:30,954 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:30,954 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:31,083 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:31,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:31,104 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:31,119 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:05:31,120 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:05:31,223 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:05:31,223 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:31,229 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:31,380 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:31,380 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:31,437 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:31,443 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:31,443 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-10-22 16:05:31,443 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:31,444 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 16:05:31,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 16:05:31,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:05:31,445 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 7 states. [2018-10-22 16:05:31,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:31,915 INFO L93 Difference]: Finished difference Result 74 states and 88 transitions. [2018-10-22 16:05:31,916 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 16:05:31,916 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2018-10-22 16:05:31,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:31,918 INFO L225 Difference]: With dead ends: 74 [2018-10-22 16:05:31,919 INFO L226 Difference]: Without dead ends: 61 [2018-10-22 16:05:31,919 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 87 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:05:31,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-22 16:05:31,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 31. [2018-10-22 16:05:31,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-22 16:05:31,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2018-10-22 16:05:31,925 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 24 [2018-10-22 16:05:31,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:31,925 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2018-10-22 16:05:31,925 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 16:05:31,926 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2018-10-22 16:05:31,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-22 16:05:31,926 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:31,926 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:31,926 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:31,927 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:31,927 INFO L82 PathProgramCache]: Analyzing trace with hash -1096493525, now seen corresponding path program 5 times [2018-10-22 16:05:31,927 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:31,927 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:31,927 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:31,928 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:31,928 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:31,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:32,190 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:32,191 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:32,191 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:32,191 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:32,191 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:32,191 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:32,191 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:32,204 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:05:32,205 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:44,373 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:05:44,373 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:44,377 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:44,405 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:44,405 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:44,624 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:44,644 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:44,645 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:44,660 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:05:44,660 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:44,845 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:05:44,845 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:44,852 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:44,886 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:44,887 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:44,906 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:44,908 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:44,909 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-10-22 16:05:44,909 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:44,910 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 16:05:44,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 16:05:44,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:05:44,911 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 8 states. [2018-10-22 16:05:45,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:45,253 INFO L93 Difference]: Finished difference Result 82 states and 98 transitions. [2018-10-22 16:05:45,253 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 16:05:45,254 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-10-22 16:05:45,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:45,255 INFO L225 Difference]: With dead ends: 82 [2018-10-22 16:05:45,256 INFO L226 Difference]: Without dead ends: 69 [2018-10-22 16:05:45,257 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 94 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:05:45,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-22 16:05:45,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 33. [2018-10-22 16:05:45,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-22 16:05:45,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2018-10-22 16:05:45,263 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 26 [2018-10-22 16:05:45,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:45,264 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2018-10-22 16:05:45,264 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 16:05:45,264 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2018-10-22 16:05:45,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-22 16:05:45,265 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:45,265 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:45,265 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:45,265 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:45,265 INFO L82 PathProgramCache]: Analyzing trace with hash -1885216495, now seen corresponding path program 6 times [2018-10-22 16:05:45,265 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:45,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:45,266 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:45,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:45,267 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:45,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:45,430 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:45,430 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:45,430 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:45,431 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:45,431 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:45,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:45,431 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:45,438 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:05:45,438 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:05:45,700 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 16:05:45,700 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:45,704 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:45,733 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:45,733 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:45,903 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:45,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:45,923 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:45,940 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:05:45,941 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:05:46,333 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 16:05:46,333 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:46,339 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:46,369 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:46,369 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:46,387 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:46,389 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:46,389 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 16 [2018-10-22 16:05:46,389 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:46,389 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 16:05:46,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 16:05:46,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-22 16:05:46,390 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 9 states. [2018-10-22 16:05:46,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:46,689 INFO L93 Difference]: Finished difference Result 90 states and 108 transitions. [2018-10-22 16:05:46,690 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 16:05:46,690 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2018-10-22 16:05:46,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:46,691 INFO L225 Difference]: With dead ends: 90 [2018-10-22 16:05:46,691 INFO L226 Difference]: Without dead ends: 77 [2018-10-22 16:05:46,692 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 101 SyntacticMatches, 4 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-22 16:05:46,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-10-22 16:05:46,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 35. [2018-10-22 16:05:46,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-22 16:05:46,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2018-10-22 16:05:46,699 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 28 [2018-10-22 16:05:46,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:46,699 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2018-10-22 16:05:46,699 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 16:05:46,700 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2018-10-22 16:05:46,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-22 16:05:46,700 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:46,701 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:46,701 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:46,701 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:46,701 INFO L82 PathProgramCache]: Analyzing trace with hash 361220727, now seen corresponding path program 7 times [2018-10-22 16:05:46,701 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:46,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:46,702 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:46,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:46,703 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:46,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:47,016 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:47,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:47,017 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:47,017 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:47,017 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:47,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:47,018 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:47,026 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:47,026 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:05:47,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:47,076 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:47,114 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:47,114 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:47,403 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:47,424 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:47,424 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:47,443 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:47,443 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:05:47,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:47,575 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:47,597 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:47,597 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:47,606 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:47,607 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:47,607 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 18 [2018-10-22 16:05:47,608 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:47,612 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:05:47,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:05:47,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:05:47,613 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 10 states. [2018-10-22 16:05:48,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:48,032 INFO L93 Difference]: Finished difference Result 98 states and 118 transitions. [2018-10-22 16:05:48,034 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:05:48,035 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2018-10-22 16:05:48,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:48,036 INFO L225 Difference]: With dead ends: 98 [2018-10-22 16:05:48,036 INFO L226 Difference]: Without dead ends: 85 [2018-10-22 16:05:48,036 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 108 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:05:48,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-22 16:05:48,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 37. [2018-10-22 16:05:48,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-22 16:05:48,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2018-10-22 16:05:48,042 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 30 [2018-10-22 16:05:48,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:48,042 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2018-10-22 16:05:48,042 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:05:48,043 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2018-10-22 16:05:48,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-22 16:05:48,043 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:48,044 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:48,044 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:48,044 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:48,044 INFO L82 PathProgramCache]: Analyzing trace with hash -1181158819, now seen corresponding path program 8 times [2018-10-22 16:05:48,044 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:48,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:48,045 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:48,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:48,045 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:48,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:48,557 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:48,557 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:48,557 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:48,558 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:48,558 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:48,558 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:48,558 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:48,568 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:05:48,568 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:48,606 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:05:48,606 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:48,608 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:48,645 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:48,645 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:49,341 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:49,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:49,361 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:49,377 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:05:49,377 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:49,523 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:05:49,523 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:49,528 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:49,552 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:49,552 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:49,566 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:49,567 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:49,568 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 20 [2018-10-22 16:05:49,568 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:49,568 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 16:05:49,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 16:05:49,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:05:49,569 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 11 states. [2018-10-22 16:05:50,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:50,096 INFO L93 Difference]: Finished difference Result 106 states and 128 transitions. [2018-10-22 16:05:50,097 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 16:05:50,097 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2018-10-22 16:05:50,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:50,098 INFO L225 Difference]: With dead ends: 106 [2018-10-22 16:05:50,099 INFO L226 Difference]: Without dead ends: 93 [2018-10-22 16:05:50,099 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 115 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:05:50,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-10-22 16:05:50,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 39. [2018-10-22 16:05:50,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-22 16:05:50,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2018-10-22 16:05:50,108 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 32 [2018-10-22 16:05:50,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:50,109 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2018-10-22 16:05:50,109 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 16:05:50,109 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2018-10-22 16:05:50,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-22 16:05:50,110 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:50,110 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:50,110 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:50,111 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:50,111 INFO L82 PathProgramCache]: Analyzing trace with hash -1644185405, now seen corresponding path program 9 times [2018-10-22 16:05:50,111 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:50,111 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:50,112 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:50,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:50,112 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:50,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:50,398 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2018-10-22 16:05:50,895 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:50,895 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:50,895 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:50,895 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:50,895 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:50,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:50,896 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:50,907 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:05:50,907 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:06:20,300 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:06:20,300 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:20,438 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:20,530 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 8 [2018-10-22 16:06:20,546 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2018-10-22 16:06:20,546 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:06:20,569 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:06:20,671 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:06:20,672 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:18, output treesize:14 [2018-10-22 16:06:20,911 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 16 [2018-10-22 16:06:20,919 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 16:06:20,921 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 23 [2018-10-22 16:06:20,921 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:06:20,929 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:06:20,974 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:06:20,975 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:27, output treesize:14 [2018-10-22 16:06:21,005 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 16 [2018-10-22 16:06:21,007 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 16:06:21,009 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 23 [2018-10-22 16:06:21,009 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:06:21,017 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:06:21,027 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:06:21,027 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:27, output treesize:14 [2018-10-22 16:06:21,115 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 16 [2018-10-22 16:06:21,151 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 16:06:21,162 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 23 [2018-10-22 16:06:21,162 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:06:21,175 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:06:21,183 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:06:21,184 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:27, output treesize:14 [2018-10-22 16:06:21,235 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 16 [2018-10-22 16:06:21,241 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 16:06:21,243 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 23 [2018-10-22 16:06:21,243 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:06:21,249 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:06:21,257 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:06:21,257 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:24, output treesize:11 [2018-10-22 16:06:21,285 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 22 [2018-10-22 16:06:21,302 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 38 [2018-10-22 16:06:21,303 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2018-10-22 16:06:21,325 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2018-10-22 16:06:21,352 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 2 xjuncts. [2018-10-22 16:06:21,353 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:30, output treesize:27 [2018-10-22 16:06:21,400 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 25 [2018-10-22 16:06:21,427 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 35 [2018-10-22 16:06:21,428 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2018-10-22 16:06:21,471 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2018-10-22 16:06:21,519 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 29 [2018-10-22 16:06:21,526 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 15 [2018-10-22 16:06:21,526 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-10-22 16:06:21,537 INFO L267 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:06:21,575 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-2 vars, End of recursive call: and 3 xjuncts. [2018-10-22 16:06:21,575 INFO L202 ElimStorePlain]: Needed 5 recursive calls to eliminate 4 variables, input treesize:63, output treesize:40 [2018-10-22 16:06:21,677 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 29 [2018-10-22 16:06:21,688 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 15 [2018-10-22 16:06:21,688 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:06:21,762 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:06:21,820 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 29 [2018-10-22 16:06:21,825 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 15 [2018-10-22 16:06:21,825 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-10-22 16:06:21,836 INFO L267 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:06:21,886 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 25 [2018-10-22 16:06:21,968 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 35 [2018-10-22 16:06:21,968 INFO L267 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 2 xjuncts. [2018-10-22 16:06:21,989 INFO L267 ElimStorePlain]: Start of recursive call 6: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2018-10-22 16:06:22,043 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 3 dim-2 vars, End of recursive call: and 4 xjuncts. [2018-10-22 16:06:22,043 INFO L202 ElimStorePlain]: Needed 7 recursive calls to eliminate 6 variables, input treesize:95, output treesize:53 [2018-10-22 16:06:22,167 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 25 [2018-10-22 16:06:22,193 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 35 [2018-10-22 16:06:22,194 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2018-10-22 16:06:22,217 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2018-10-22 16:06:22,304 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 29 [2018-10-22 16:06:22,309 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 15 [2018-10-22 16:06:22,310 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-10-22 16:06:22,321 INFO L267 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:06:22,409 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 29 [2018-10-22 16:06:22,413 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 15 [2018-10-22 16:06:22,414 INFO L267 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 1 xjuncts. [2018-10-22 16:06:22,423 INFO L267 ElimStorePlain]: Start of recursive call 6: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:06:22,502 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 29 [2018-10-22 16:06:22,506 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 15 [2018-10-22 16:06:22,506 INFO L267 ElimStorePlain]: Start of recursive call 9: End of recursive call: and 1 xjuncts. [2018-10-22 16:06:22,515 INFO L267 ElimStorePlain]: Start of recursive call 8: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:06:22,584 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 4 dim-2 vars, End of recursive call: and 5 xjuncts. [2018-10-22 16:06:22,585 INFO L202 ElimStorePlain]: Needed 9 recursive calls to eliminate 8 variables, input treesize:127, output treesize:66 [2018-10-22 16:06:22,822 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:22,822 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:23,888 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 60 [2018-10-22 16:06:23,891 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 60 treesize of output 64 [2018-10-22 16:06:23,893 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:23,896 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 64 treesize of output 84 [2018-10-22 16:06:23,924 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:23,940 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:23,949 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:23,962 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 123 [2018-10-22 16:06:23,967 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:23,971 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:23,972 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:23,972 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:23,973 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:23,974 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:23,985 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 181 [2018-10-22 16:06:24,127 WARN L179 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 54 [2018-10-22 16:06:24,135 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:24,136 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:24,137 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:24,138 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:24,139 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:24,139 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:24,156 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 119 [2018-10-22 16:06:24,156 INFO L267 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 1 xjuncts. [2018-10-22 16:06:24,188 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:24,201 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:24,213 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:24,220 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:24,222 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:24,224 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:06:24,272 INFO L303 Elim1Store]: Index analysis took 114 ms [2018-10-22 16:06:24,333 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 1 new quantified variables, introduced 4 case distinctions, treesize of input 62 treesize of output 176 [2018-10-22 16:06:24,340 INFO L267 ElimStorePlain]: Start of recursive call 8: End of recursive call: and 16 xjuncts. [2018-10-22 16:06:24,723 INFO L267 ElimStorePlain]: Start of recursive call 6: 1 dim-1 vars, End of recursive call: and 10 xjuncts. [2018-10-22 16:06:24,926 INFO L267 ElimStorePlain]: Start of recursive call 5: 1 dim-1 vars, End of recursive call: and 6 xjuncts. [2018-10-22 16:06:25,116 INFO L267 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 6 xjuncts. [2018-10-22 16:06:25,285 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 6 xjuncts. [2018-10-22 16:06:25,430 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 6 xjuncts. [2018-10-22 16:06:25,577 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 6 xjuncts. [2018-10-22 16:06:25,577 INFO L202 ElimStorePlain]: Needed 8 recursive calls to eliminate 5 variables, input treesize:62, output treesize:267 [2018-10-22 16:06:25,730 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:25,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:25,735 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:06:25,751 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:06:25,751 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:06:26,934 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:06:26,935 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:26,940 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:26,954 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:26,954 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:27,498 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:27,500 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:06:27,500 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14, 14, 12, 12] total 46 [2018-10-22 16:06:27,500 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:06:27,501 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-22 16:06:27,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-22 16:06:27,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=1600, Unknown=0, NotChecked=0, Total=2070 [2018-10-22 16:06:27,503 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 24 states. [2018-10-22 16:06:29,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:06:29,438 INFO L93 Difference]: Finished difference Result 191 states and 242 transitions. [2018-10-22 16:06:29,438 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-22 16:06:29,438 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 34 [2018-10-22 16:06:29,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:06:29,441 INFO L225 Difference]: With dead ends: 191 [2018-10-22 16:06:29,441 INFO L226 Difference]: Without dead ends: 178 [2018-10-22 16:06:29,443 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 98 SyntacticMatches, 4 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 672 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=605, Invalid=1945, Unknown=0, NotChecked=0, Total=2550 [2018-10-22 16:06:29,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-10-22 16:06:29,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 55. [2018-10-22 16:06:29,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-10-22 16:06:29,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 62 transitions. [2018-10-22 16:06:29,457 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 62 transitions. Word has length 34 [2018-10-22 16:06:29,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:06:29,458 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 62 transitions. [2018-10-22 16:06:29,458 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-22 16:06:29,458 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 62 transitions. [2018-10-22 16:06:29,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-22 16:06:29,459 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:06:29,459 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:06:29,459 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:06:29,459 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:29,460 INFO L82 PathProgramCache]: Analyzing trace with hash 62017191, now seen corresponding path program 1 times [2018-10-22 16:06:29,460 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:06:29,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:29,460 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:06:29,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:29,461 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:06:29,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:29,639 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-10-22 16:06:29,639 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:06:29,639 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-22 16:06:29,640 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:06:29,640 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 16:06:29,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 16:06:29,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-22 16:06:29,641 INFO L87 Difference]: Start difference. First operand 55 states and 62 transitions. Second operand 5 states. [2018-10-22 16:06:29,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:06:29,682 INFO L93 Difference]: Finished difference Result 63 states and 70 transitions. [2018-10-22 16:06:29,682 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 16:06:29,683 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 36 [2018-10-22 16:06:29,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:06:29,684 INFO L225 Difference]: With dead ends: 63 [2018-10-22 16:06:29,684 INFO L226 Difference]: Without dead ends: 61 [2018-10-22 16:06:29,685 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:06:29,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-22 16:06:29,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2018-10-22 16:06:29,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-22 16:06:29,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 67 transitions. [2018-10-22 16:06:29,692 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 67 transitions. Word has length 36 [2018-10-22 16:06:29,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:06:29,692 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 67 transitions. [2018-10-22 16:06:29,692 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 16:06:29,692 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 67 transitions. [2018-10-22 16:06:29,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-22 16:06:29,696 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:06:29,696 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:06:29,696 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:06:29,696 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:29,696 INFO L82 PathProgramCache]: Analyzing trace with hash -462457896, now seen corresponding path program 1 times [2018-10-22 16:06:29,696 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:06:29,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:29,701 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:06:29,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:29,701 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:06:29,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:30,306 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 2 proven. 110 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:06:30,306 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:30,306 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:06:30,306 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 47 with the following transitions: [2018-10-22 16:06:30,307 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [13], [15], [19], [23], [28], [31], [33], [36], [38], [44], [47], [49], [52], [54], [55], [56], [57], [59], [60] [2018-10-22 16:06:30,308 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:06:30,309 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:06:30,319 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:06:33,963 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:06:33,963 INFO L272 AbstractInterpreter]: Visited 23 different actions 927 times. Merged at 11 different actions 441 times. Widened at 3 different actions 77 times. Found 86 fixpoints after 5 different actions. Largest state had 32 variables. [2018-10-22 16:06:34,007 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:34,007 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:06:34,007 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:34,008 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:06:34,019 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:06:34,019 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:06:34,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:34,073 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:34,146 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-22 16:06:34,146 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:34,633 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 2 proven. 110 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:06:34,654 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:34,655 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:06:34,670 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:06:34,670 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:06:34,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:34,921 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:35,057 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-22 16:06:35,057 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:35,156 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 2 proven. 110 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:06:35,157 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:06:35,158 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 24 [2018-10-22 16:06:35,158 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:06:35,158 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 16:06:35,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 16:06:35,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:06:35,159 INFO L87 Difference]: Start difference. First operand 60 states and 67 transitions. Second operand 13 states. [2018-10-22 16:06:35,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:06:35,985 INFO L93 Difference]: Finished difference Result 158 states and 199 transitions. [2018-10-22 16:06:35,990 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 16:06:35,990 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 46 [2018-10-22 16:06:35,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:06:35,993 INFO L225 Difference]: With dead ends: 158 [2018-10-22 16:06:35,993 INFO L226 Difference]: Without dead ends: 137 [2018-10-22 16:06:35,994 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 169 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:06:35,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2018-10-22 16:06:36,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 60. [2018-10-22 16:06:36,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-22 16:06:36,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 66 transitions. [2018-10-22 16:06:36,006 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 66 transitions. Word has length 46 [2018-10-22 16:06:36,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:06:36,006 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 66 transitions. [2018-10-22 16:06:36,006 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 16:06:36,006 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 66 transitions. [2018-10-22 16:06:36,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-22 16:06:36,007 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:06:36,008 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:06:36,008 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:06:36,008 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:36,008 INFO L82 PathProgramCache]: Analyzing trace with hash 585326503, now seen corresponding path program 10 times [2018-10-22 16:06:36,008 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:06:36,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:36,009 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:06:36,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:36,009 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:06:36,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:37,253 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:37,253 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:37,253 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:06:37,253 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:06:37,253 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:06:37,253 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:37,254 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:06:37,260 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:06:37,260 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:06:37,323 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:06:37,323 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:37,325 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:37,349 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:37,349 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:38,150 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:38,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:38,171 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:06:38,188 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:06:38,188 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:06:38,576 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:06:38,576 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:38,583 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:38,619 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:38,620 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:38,694 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:38,697 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:06:38,697 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 34 [2018-10-22 16:06:38,697 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:06:38,698 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 16:06:38,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 16:06:38,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-22 16:06:38,699 INFO L87 Difference]: Start difference. First operand 60 states and 66 transitions. Second operand 18 states. [2018-10-22 16:06:40,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:06:40,218 INFO L93 Difference]: Finished difference Result 192 states and 248 transitions. [2018-10-22 16:06:40,219 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 16:06:40,219 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 46 [2018-10-22 16:06:40,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:06:40,222 INFO L225 Difference]: With dead ends: 192 [2018-10-22 16:06:40,222 INFO L226 Difference]: Without dead ends: 170 [2018-10-22 16:06:40,223 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 164 SyntacticMatches, 4 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-22 16:06:40,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2018-10-22 16:06:40,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 58. [2018-10-22 16:06:40,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-22 16:06:40,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2018-10-22 16:06:40,235 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 46 [2018-10-22 16:06:40,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:06:40,235 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2018-10-22 16:06:40,235 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 16:06:40,236 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2018-10-22 16:06:40,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-10-22 16:06:40,236 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:06:40,236 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:06:40,237 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:06:40,237 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:40,237 INFO L82 PathProgramCache]: Analyzing trace with hash -563872883, now seen corresponding path program 11 times [2018-10-22 16:06:40,237 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:06:40,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:40,238 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:06:40,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:40,238 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:06:40,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:41,008 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:41,008 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:41,008 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:06:41,009 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:06:41,009 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:06:41,009 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:41,009 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:06:41,021 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:06:41,021 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:58,149 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2018-10-22 16:08:58,149 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:58,949 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:58,968 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:58,968 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:00,188 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:00,194 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:00,194 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:00,211 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:00,211 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:07,530 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2018-10-22 16:09:07,530 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:07,539 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:07,552 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:07,552 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:07,561 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:07,563 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:07,563 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 36 [2018-10-22 16:09:07,563 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:07,564 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-22 16:09:07,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-22 16:09:07,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:09:07,566 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 19 states. [2018-10-22 16:09:09,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:09,030 INFO L93 Difference]: Finished difference Result 197 states and 252 transitions. [2018-10-22 16:09:09,033 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 16:09:09,033 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 48 [2018-10-22 16:09:09,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:09,036 INFO L225 Difference]: With dead ends: 197 [2018-10-22 16:09:09,037 INFO L226 Difference]: Without dead ends: 179 [2018-10-22 16:09:09,038 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 171 SyntacticMatches, 4 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:09:09,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2018-10-22 16:09:09,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 60. [2018-10-22 16:09:09,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-22 16:09:09,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2018-10-22 16:09:09,049 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 48 [2018-10-22 16:09:09,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:09,049 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2018-10-22 16:09:09,050 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-22 16:09:09,050 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2018-10-22 16:09:09,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-22 16:09:09,050 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:09,051 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:09,051 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:09,051 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:09,051 INFO L82 PathProgramCache]: Analyzing trace with hash -1137887757, now seen corresponding path program 12 times [2018-10-22 16:09:09,051 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:09,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:09,052 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:09,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:09,052 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:09,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:09,971 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:09,971 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:09,971 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:09,971 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:09,971 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:09,971 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:09,972 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:09,981 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:09,981 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown