java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf -i ../../../trunk/examples/svcomp/loop-acceleration/diamond_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:28:24,977 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:28:24,982 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:28:24,995 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:28:24,996 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:28:24,997 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:28:24,998 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:28:25,000 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:28:25,001 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:28:25,002 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:28:25,003 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:28:25,003 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:28:25,004 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:28:25,005 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:28:25,007 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:28:25,007 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:28:25,008 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:28:25,010 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:28:25,012 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:28:25,014 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:28:25,015 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:28:25,016 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:28:25,019 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:28:25,019 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:28:25,019 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:28:25,023 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:28:25,024 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:28:25,025 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:28:25,026 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:28:25,029 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:28:25,029 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:28:25,032 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-24 12:28:25,035 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-24 12:28:25,050 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:28:25,050 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:28:25,051 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:28:25,051 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:28:25,051 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:28:25,051 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:28:25,052 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-24 12:28:25,052 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:28:25,052 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-24 12:28:25,052 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:28:25,052 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:28:25,052 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:28:25,053 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:28:25,053 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:28:25,054 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:28:25,054 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:28:25,054 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:28:25,054 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:28:25,054 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:28:25,054 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:28:25,055 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:28:25,055 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:28:25,055 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:28:25,055 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:28:25,056 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:28:25,056 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:28:25,056 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:28:25,056 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:28:25,056 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:28:25,056 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:28:25,057 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:28:25,057 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:28:25,057 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:28:25,057 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:28:25,057 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:28:25,058 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:28:25,111 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:28:25,133 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:28:25,137 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:28:25,139 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:28:25,140 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:28:25,140 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/diamond_false-unreach-call1.i [2018-10-24 12:28:25,213 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/a69bd7663/5f3d0a3497284902bfa37c704a79cd5c/FLAGdc33c6f15 [2018-10-24 12:28:25,681 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:28:25,682 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/diamond_false-unreach-call1.i [2018-10-24 12:28:25,688 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/a69bd7663/5f3d0a3497284902bfa37c704a79cd5c/FLAGdc33c6f15 [2018-10-24 12:28:25,708 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/a69bd7663/5f3d0a3497284902bfa37c704a79cd5c [2018-10-24 12:28:25,723 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:28:25,726 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:28:25,729 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:28:25,729 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:28:25,735 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:28:25,737 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:28:25" (1/1) ... [2018-10-24 12:28:25,740 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7b295a00 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:25, skipping insertion in model container [2018-10-24 12:28:25,740 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:28:25" (1/1) ... [2018-10-24 12:28:25,751 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:28:25,778 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:28:26,006 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:28:26,012 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:28:26,041 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:28:26,061 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:28:26,061 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:26 WrapperNode [2018-10-24 12:28:26,062 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:28:26,062 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:28:26,063 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:28:26,063 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:28:26,073 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:26" (1/1) ... [2018-10-24 12:28:26,079 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:26" (1/1) ... [2018-10-24 12:28:26,087 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:28:26,087 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:28:26,087 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:28:26,087 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:28:26,098 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:26" (1/1) ... [2018-10-24 12:28:26,098 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:26" (1/1) ... [2018-10-24 12:28:26,099 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:26" (1/1) ... [2018-10-24 12:28:26,099 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:26" (1/1) ... [2018-10-24 12:28:26,104 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:26" (1/1) ... [2018-10-24 12:28:26,116 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:26" (1/1) ... [2018-10-24 12:28:26,117 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:26" (1/1) ... [2018-10-24 12:28:26,121 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:28:26,121 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:28:26,122 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:28:26,122 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:28:26,123 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:26" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:28:26,262 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:28:26,262 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:28:26,262 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:28:26,263 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:28:26,263 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:28:26,263 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:28:26,263 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:28:26,263 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:28:26,459 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:28:26,460 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:28:26 BoogieIcfgContainer [2018-10-24 12:28:26,460 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:28:26,461 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:28:26,461 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:28:26,464 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:28:26,465 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:28:25" (1/3) ... [2018-10-24 12:28:26,465 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76df2c0f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:28:26, skipping insertion in model container [2018-10-24 12:28:26,466 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:26" (2/3) ... [2018-10-24 12:28:26,466 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76df2c0f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:28:26, skipping insertion in model container [2018-10-24 12:28:26,466 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:28:26" (3/3) ... [2018-10-24 12:28:26,468 INFO L112 eAbstractionObserver]: Analyzing ICFG diamond_false-unreach-call1.i [2018-10-24 12:28:26,478 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:28:26,486 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:28:26,503 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:28:26,540 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:28:26,540 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:28:26,540 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:28:26,541 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:28:26,541 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:28:26,541 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:28:26,541 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:28:26,541 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:28:26,559 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-10-24 12:28:26,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-24 12:28:26,565 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:26,567 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:26,569 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:26,577 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:26,577 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-10-24 12:28:26,581 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:26,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:26,630 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:26,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:26,630 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:26,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:26,691 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:26,693 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:28:26,694 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:28:26,694 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:28:26,699 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:28:26,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:28:26,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:28:26,719 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-10-24 12:28:26,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:26,742 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-24 12:28:26,743 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:28:26,744 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-24 12:28:26,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:26,753 INFO L225 Difference]: With dead ends: 30 [2018-10-24 12:28:26,754 INFO L226 Difference]: Without dead ends: 13 [2018-10-24 12:28:26,757 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:28:26,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-24 12:28:26,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-24 12:28:26,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-24 12:28:26,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-10-24 12:28:26,798 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-10-24 12:28:26,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:26,799 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-10-24 12:28:26,799 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:28:26,799 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-10-24 12:28:26,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-24 12:28:26,800 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:26,800 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:26,801 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:26,801 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:26,801 INFO L82 PathProgramCache]: Analyzing trace with hash 1144102878, now seen corresponding path program 1 times [2018-10-24 12:28:26,801 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:26,803 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:26,803 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:26,803 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:26,803 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:26,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:26,987 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:26,987 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:28:26,988 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:28:26,988 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:28:26,989 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:28:26,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:28:26,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:28:26,991 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-10-24 12:28:27,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:27,086 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2018-10-24 12:28:27,087 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:28:27,087 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-24 12:28:27,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:27,090 INFO L225 Difference]: With dead ends: 21 [2018-10-24 12:28:27,090 INFO L226 Difference]: Without dead ends: 16 [2018-10-24 12:28:27,091 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:28:27,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-24 12:28:27,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-10-24 12:28:27,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-24 12:28:27,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-10-24 12:28:27,104 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2018-10-24 12:28:27,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:27,105 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-10-24 12:28:27,105 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:28:27,105 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-10-24 12:28:27,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-24 12:28:27,106 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:27,106 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:27,107 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:27,107 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:27,107 INFO L82 PathProgramCache]: Analyzing trace with hash -2056921797, now seen corresponding path program 1 times [2018-10-24 12:28:27,107 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:27,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:27,109 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:27,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:27,109 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:27,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:27,243 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:27,243 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:27,244 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:27,245 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-24 12:28:27,249 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [26], [29], [31], [37], [38], [39], [41] [2018-10-24 12:28:27,289 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:28:27,289 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:28:27,551 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:28:27,552 INFO L272 AbstractInterpreter]: Visited 13 different actions 21 times. Merged at 3 different actions 6 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 4 variables. [2018-10-24 12:28:27,600 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:27,602 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:28:27,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:27,602 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:27,618 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:27,618 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:27,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:27,657 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:27,705 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:27,705 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:27,772 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:27,793 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:27,794 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-24 12:28:27,794 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:27,794 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 12:28:27,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 12:28:27,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:28:27,796 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 4 states. [2018-10-24 12:28:27,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:27,940 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2018-10-24 12:28:27,942 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:28:27,942 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-24 12:28:27,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:27,943 INFO L225 Difference]: With dead ends: 24 [2018-10-24 12:28:27,943 INFO L226 Difference]: Without dead ends: 19 [2018-10-24 12:28:27,944 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:28:27,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-24 12:28:27,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2018-10-24 12:28:27,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 12:28:27,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2018-10-24 12:28:27,949 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2018-10-24 12:28:27,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:27,949 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2018-10-24 12:28:27,949 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 12:28:27,950 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2018-10-24 12:28:27,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-24 12:28:27,950 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:27,951 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:27,951 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:27,951 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:27,951 INFO L82 PathProgramCache]: Analyzing trace with hash -281914435, now seen corresponding path program 1 times [2018-10-24 12:28:27,952 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:27,953 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:27,953 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:27,953 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:27,953 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:27,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:28,137 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:28,138 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:28,138 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:28,138 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-24 12:28:28,138 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-24 12:28:28,140 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:28:28,140 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:28:28,266 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:28:28,268 INFO L272 AbstractInterpreter]: Visited 13 different actions 21 times. Merged at 3 different actions 6 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-24 12:28:28,305 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:28,305 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:28:28,306 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:28,306 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:28,321 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:28,321 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:28,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:28,340 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:28,396 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:28,396 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:28,483 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:28,505 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:28,505 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-24 12:28:28,505 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:28,505 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 12:28:28,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 12:28:28,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:28:28,506 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 4 states. [2018-10-24 12:28:28,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:28,550 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2018-10-24 12:28:28,551 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:28:28,552 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-24 12:28:28,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:28,552 INFO L225 Difference]: With dead ends: 26 [2018-10-24 12:28:28,553 INFO L226 Difference]: Without dead ends: 21 [2018-10-24 12:28:28,553 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:28:28,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-24 12:28:28,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2018-10-24 12:28:28,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 12:28:28,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2018-10-24 12:28:28,558 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2018-10-24 12:28:28,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:28,559 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2018-10-24 12:28:28,559 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 12:28:28,559 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2018-10-24 12:28:28,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 12:28:28,559 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:28,560 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:28,560 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:28,560 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:28,560 INFO L82 PathProgramCache]: Analyzing trace with hash 1670825662, now seen corresponding path program 2 times [2018-10-24 12:28:28,561 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:28,562 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:28,562 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:28,562 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:28,562 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:28,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:28,908 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:28,908 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:28,908 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:28,909 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:28,909 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:28,909 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:28,909 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:28,926 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:28,926 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:28,962 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:28:28,962 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:28,963 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:28,993 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:28,993 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:29,074 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:29,101 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:29,101 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-24 12:28:29,101 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:29,101 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:28:29,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:28:29,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:28:29,102 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2018-10-24 12:28:29,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:29,288 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2018-10-24 12:28:29,291 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:28:29,291 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-10-24 12:28:29,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:29,292 INFO L225 Difference]: With dead ends: 29 [2018-10-24 12:28:29,292 INFO L226 Difference]: Without dead ends: 24 [2018-10-24 12:28:29,293 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:28:29,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-24 12:28:29,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2018-10-24 12:28:29,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-24 12:28:29,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2018-10-24 12:28:29,298 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 17 [2018-10-24 12:28:29,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:29,298 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2018-10-24 12:28:29,298 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:28:29,299 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2018-10-24 12:28:29,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 12:28:29,299 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:29,300 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:29,300 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:29,300 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:29,300 INFO L82 PathProgramCache]: Analyzing trace with hash -849134272, now seen corresponding path program 1 times [2018-10-24 12:28:29,300 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:29,301 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:29,302 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:29,302 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:29,302 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:29,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:29,425 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:29,426 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:29,426 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:29,426 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 18 with the following transitions: [2018-10-24 12:28:29,426 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-24 12:28:29,428 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:28:29,428 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:28:29,661 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:28:29,661 INFO L272 AbstractInterpreter]: Visited 14 different actions 43 times. Merged at 4 different actions 19 times. Widened at 2 different actions 3 times. Found 10 fixpoints after 4 different actions. Largest state had 4 variables. [2018-10-24 12:28:29,697 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:29,697 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:28:29,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:29,697 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:29,716 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:29,716 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:29,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:29,745 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:29,953 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 5 [2018-10-24 12:28:29,958 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:29,958 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:30,053 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:30,075 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-24 12:28:30,075 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 6 [2018-10-24 12:28:30,076 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:28:30,076 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:28:30,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:28:30,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:28:30,077 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand 3 states. [2018-10-24 12:28:30,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:30,095 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2018-10-24 12:28:30,096 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:28:30,096 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-10-24 12:28:30,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:30,097 INFO L225 Difference]: With dead ends: 35 [2018-10-24 12:28:30,097 INFO L226 Difference]: Without dead ends: 27 [2018-10-24 12:28:30,098 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:28:30,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-24 12:28:30,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-24 12:28:30,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-24 12:28:30,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2018-10-24 12:28:30,105 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 17 [2018-10-24 12:28:30,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:30,105 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2018-10-24 12:28:30,105 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:28:30,106 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2018-10-24 12:28:30,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 12:28:30,106 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:30,106 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:30,107 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:30,107 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:30,107 INFO L82 PathProgramCache]: Analyzing trace with hash 1277798652, now seen corresponding path program 2 times [2018-10-24 12:28:30,107 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:30,108 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:30,108 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:30,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:30,109 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:30,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:30,307 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:30,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:30,307 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:30,308 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:30,308 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:30,308 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:30,308 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:30,316 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:30,316 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:30,345 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:28:30,345 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:30,348 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:30,616 WARN L179 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 6 [2018-10-24 12:28:30,632 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:30,632 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:30,811 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:30,837 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-24 12:28:30,837 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 6 [2018-10-24 12:28:30,837 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:28:30,838 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:28:30,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:28:30,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:28:30,838 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 3 states. [2018-10-24 12:28:30,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:30,855 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2018-10-24 12:28:30,857 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:28:30,857 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-10-24 12:28:30,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:30,858 INFO L225 Difference]: With dead ends: 35 [2018-10-24 12:28:30,858 INFO L226 Difference]: Without dead ends: 27 [2018-10-24 12:28:30,859 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:28:30,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-24 12:28:30,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-24 12:28:30,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-24 12:28:30,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2018-10-24 12:28:30,865 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 17 [2018-10-24 12:28:30,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:30,865 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2018-10-24 12:28:30,865 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:28:30,866 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2018-10-24 12:28:30,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 12:28:30,866 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:30,867 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:30,867 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:30,867 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:30,867 INFO L82 PathProgramCache]: Analyzing trace with hash -1242161282, now seen corresponding path program 2 times [2018-10-24 12:28:30,867 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:30,868 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:30,869 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:30,869 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:30,869 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:30,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:31,082 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:31,082 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:31,082 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:31,083 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:31,083 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:31,083 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:31,083 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:31,093 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:31,094 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:31,103 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:28:31,104 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:31,105 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:31,138 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:31,139 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:31,251 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:31,279 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:31,279 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-24 12:28:31,279 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:31,279 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:28:31,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:28:31,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:28:31,280 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 5 states. [2018-10-24 12:28:31,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:31,342 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2018-10-24 12:28:31,343 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:28:31,343 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-10-24 12:28:31,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:31,344 INFO L225 Difference]: With dead ends: 35 [2018-10-24 12:28:31,344 INFO L226 Difference]: Without dead ends: 30 [2018-10-24 12:28:31,345 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:28:31,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-24 12:28:31,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-10-24 12:28:31,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-24 12:28:31,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2018-10-24 12:28:31,350 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 17 [2018-10-24 12:28:31,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:31,351 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2018-10-24 12:28:31,351 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:28:31,351 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2018-10-24 12:28:31,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-24 12:28:31,352 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:31,352 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:31,352 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:31,352 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:31,352 INFO L82 PathProgramCache]: Analyzing trace with hash 26004059, now seen corresponding path program 3 times [2018-10-24 12:28:31,353 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:31,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:31,354 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:31,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:31,354 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:31,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:31,576 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:31,576 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:31,577 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:31,577 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:31,577 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:31,577 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:31,577 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:31,585 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:31,585 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:31,595 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:31,595 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:31,598 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:31,620 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:31,620 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:31,744 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:31,766 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:31,766 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-24 12:28:31,766 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:31,766 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:28:31,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:28:31,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:28:31,768 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 6 states. [2018-10-24 12:28:31,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:31,886 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2018-10-24 12:28:31,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:28:31,888 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-24 12:28:31,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:31,889 INFO L225 Difference]: With dead ends: 38 [2018-10-24 12:28:31,889 INFO L226 Difference]: Without dead ends: 33 [2018-10-24 12:28:31,890 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:28:31,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-24 12:28:31,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-10-24 12:28:31,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-24 12:28:31,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2018-10-24 12:28:31,895 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 20 [2018-10-24 12:28:31,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:31,895 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2018-10-24 12:28:31,896 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:28:31,896 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2018-10-24 12:28:31,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-24 12:28:31,896 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:31,897 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:31,897 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:31,897 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:31,897 INFO L82 PathProgramCache]: Analyzing trace with hash 821178397, now seen corresponding path program 3 times [2018-10-24 12:28:31,897 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:31,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:31,898 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:31,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:31,899 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:31,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:32,119 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:32,119 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:32,120 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:32,120 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:32,120 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:32,120 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:32,120 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:32,135 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:32,135 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:32,158 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:32,159 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:32,161 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:32,168 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:32,168 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:32,431 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:32,452 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:32,452 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-24 12:28:32,452 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:32,452 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:28:32,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:28:32,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:28:32,453 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 6 states. [2018-10-24 12:28:32,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:32,517 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2018-10-24 12:28:32,518 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:28:32,518 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-24 12:28:32,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:32,519 INFO L225 Difference]: With dead ends: 41 [2018-10-24 12:28:32,520 INFO L226 Difference]: Without dead ends: 36 [2018-10-24 12:28:32,520 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:28:32,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-24 12:28:32,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2018-10-24 12:28:32,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-24 12:28:32,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2018-10-24 12:28:32,525 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 20 [2018-10-24 12:28:32,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:32,526 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2018-10-24 12:28:32,526 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:28:32,526 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2018-10-24 12:28:32,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-24 12:28:32,527 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:32,527 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:32,527 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:32,528 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:32,528 INFO L82 PathProgramCache]: Analyzing trace with hash 427509150, now seen corresponding path program 4 times [2018-10-24 12:28:32,528 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:32,529 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:32,529 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:32,529 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:32,529 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:32,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:32,686 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:32,686 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:32,686 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:32,686 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:32,687 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:32,687 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:32,687 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:32,696 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:32,696 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:32,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:32,707 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:32,715 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:32,715 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:33,280 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:33,301 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:33,301 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-24 12:28:33,301 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:33,302 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:28:33,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:28:33,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:28:33,302 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 7 states. [2018-10-24 12:28:33,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:33,393 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2018-10-24 12:28:33,394 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:28:33,394 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-10-24 12:28:33,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:33,396 INFO L225 Difference]: With dead ends: 44 [2018-10-24 12:28:33,396 INFO L226 Difference]: Without dead ends: 39 [2018-10-24 12:28:33,397 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:28:33,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-24 12:28:33,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-10-24 12:28:33,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-24 12:28:33,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-10-24 12:28:33,403 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 23 [2018-10-24 12:28:33,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:33,403 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-10-24 12:28:33,403 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:28:33,404 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-10-24 12:28:33,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-24 12:28:33,404 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:33,405 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:33,405 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:33,405 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:33,405 INFO L82 PathProgramCache]: Analyzing trace with hash 201615134, now seen corresponding path program 4 times [2018-10-24 12:28:33,405 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:33,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:33,406 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:33,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:33,406 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:33,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:33,608 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:33,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:33,608 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:33,609 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:33,609 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:33,609 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:33,609 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:33,621 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:33,621 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:33,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:33,644 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:33,662 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:33,662 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:33,867 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:33,890 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:33,890 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-24 12:28:33,890 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:33,891 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:28:33,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:28:33,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:28:33,891 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 7 states. [2018-10-24 12:28:33,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:33,959 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2018-10-24 12:28:33,960 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:28:33,960 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-10-24 12:28:33,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:33,961 INFO L225 Difference]: With dead ends: 47 [2018-10-24 12:28:33,962 INFO L226 Difference]: Without dead ends: 42 [2018-10-24 12:28:33,963 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:28:33,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-24 12:28:33,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2018-10-24 12:28:33,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-24 12:28:33,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2018-10-24 12:28:33,968 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 23 [2018-10-24 12:28:33,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:33,968 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2018-10-24 12:28:33,968 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:28:33,968 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2018-10-24 12:28:33,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-24 12:28:33,969 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:33,970 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:33,970 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:33,970 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:33,970 INFO L82 PathProgramCache]: Analyzing trace with hash 181755771, now seen corresponding path program 5 times [2018-10-24 12:28:33,970 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:33,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:33,971 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:33,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:33,972 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:33,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:34,170 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:34,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:34,171 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:34,171 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:34,171 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:34,172 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:34,172 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:34,189 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:34,190 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:34,266 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:28:34,267 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:34,269 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:34,333 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:34,334 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:34,711 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:34,732 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:34,732 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-24 12:28:34,732 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:34,733 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:28:34,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:28:34,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:28:34,733 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 8 states. [2018-10-24 12:28:34,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:34,860 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2018-10-24 12:28:34,861 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:28:34,861 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-10-24 12:28:34,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:34,862 INFO L225 Difference]: With dead ends: 50 [2018-10-24 12:28:34,863 INFO L226 Difference]: Without dead ends: 45 [2018-10-24 12:28:34,863 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:28:34,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-24 12:28:34,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2018-10-24 12:28:34,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-24 12:28:34,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2018-10-24 12:28:34,870 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 26 [2018-10-24 12:28:34,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:34,870 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2018-10-24 12:28:34,870 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:28:34,871 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2018-10-24 12:28:34,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-24 12:28:34,872 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:34,872 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:34,872 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:34,872 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:34,872 INFO L82 PathProgramCache]: Analyzing trace with hash -1733081987, now seen corresponding path program 5 times [2018-10-24 12:28:34,873 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:34,873 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:34,874 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:34,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:34,874 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:34,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:35,026 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:35,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:35,026 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:35,026 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:35,026 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:35,027 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:35,027 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:35,035 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:35,035 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:35,077 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:28:35,077 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:35,079 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:35,101 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:35,101 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:36,708 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:36,729 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:36,729 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-24 12:28:36,730 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:36,730 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:28:36,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:28:36,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:28:36,731 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 8 states. [2018-10-24 12:28:37,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:37,283 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2018-10-24 12:28:37,284 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:28:37,284 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-10-24 12:28:37,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:37,284 INFO L225 Difference]: With dead ends: 53 [2018-10-24 12:28:37,285 INFO L226 Difference]: Without dead ends: 48 [2018-10-24 12:28:37,285 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:28:37,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-24 12:28:37,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2018-10-24 12:28:37,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-24 12:28:37,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2018-10-24 12:28:37,292 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 26 [2018-10-24 12:28:37,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:37,293 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2018-10-24 12:28:37,293 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:28:37,293 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2018-10-24 12:28:37,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-24 12:28:37,294 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:37,294 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:37,294 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:37,294 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:37,295 INFO L82 PathProgramCache]: Analyzing trace with hash 1862081662, now seen corresponding path program 6 times [2018-10-24 12:28:37,295 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:37,295 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:37,296 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:37,296 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:37,296 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:37,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:37,440 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:37,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:37,441 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:37,441 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:37,441 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:37,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:37,441 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:37,449 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:37,449 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:37,463 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:37,464 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:37,466 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:37,485 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:37,486 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:38,663 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:38,683 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:38,683 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-24 12:28:38,683 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:38,684 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:28:38,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:28:38,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:28:38,685 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 9 states. [2018-10-24 12:28:38,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:38,835 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2018-10-24 12:28:38,835 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:28:38,836 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-10-24 12:28:38,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:38,837 INFO L225 Difference]: With dead ends: 56 [2018-10-24 12:28:38,837 INFO L226 Difference]: Without dead ends: 51 [2018-10-24 12:28:38,838 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:28:38,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-24 12:28:38,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2018-10-24 12:28:38,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-24 12:28:38,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2018-10-24 12:28:38,845 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 29 [2018-10-24 12:28:38,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:38,845 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2018-10-24 12:28:38,846 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:28:38,846 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2018-10-24 12:28:38,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-24 12:28:38,847 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:38,847 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:38,847 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:38,847 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:38,848 INFO L82 PathProgramCache]: Analyzing trace with hash 166098622, now seen corresponding path program 6 times [2018-10-24 12:28:38,848 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:38,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:38,849 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:38,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:38,849 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:38,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:39,009 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:39,009 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:39,009 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:39,010 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:39,010 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:39,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:39,010 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:39,018 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:39,018 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:39,028 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:39,028 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:39,030 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:39,047 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:39,048 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:40,652 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:40,673 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:40,673 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-24 12:28:40,673 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:40,673 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:28:40,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:28:40,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:28:40,674 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 9 states. [2018-10-24 12:28:40,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:40,824 INFO L93 Difference]: Finished difference Result 59 states and 61 transitions. [2018-10-24 12:28:40,825 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:28:40,825 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-10-24 12:28:40,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:40,826 INFO L225 Difference]: With dead ends: 59 [2018-10-24 12:28:40,826 INFO L226 Difference]: Without dead ends: 54 [2018-10-24 12:28:40,827 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:28:40,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-24 12:28:40,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2018-10-24 12:28:40,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-24 12:28:40,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2018-10-24 12:28:40,834 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 29 [2018-10-24 12:28:40,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:40,834 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2018-10-24 12:28:40,835 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:28:40,835 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2018-10-24 12:28:40,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-24 12:28:40,836 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:40,836 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:40,836 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:40,836 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:40,836 INFO L82 PathProgramCache]: Analyzing trace with hash -1688101733, now seen corresponding path program 7 times [2018-10-24 12:28:40,837 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:40,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:40,838 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:40,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:40,838 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:40,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:40,991 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:40,992 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:40,992 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:40,992 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:40,992 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:40,992 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:40,992 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:41,003 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:41,003 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:41,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:41,044 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:41,117 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:41,118 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:42,497 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:42,525 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:42,525 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-24 12:28:42,525 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:42,526 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:28:42,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:28:42,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:28:42,526 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand 10 states. [2018-10-24 12:28:42,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:42,725 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2018-10-24 12:28:42,726 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:28:42,726 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-24 12:28:42,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:42,727 INFO L225 Difference]: With dead ends: 62 [2018-10-24 12:28:42,727 INFO L226 Difference]: Without dead ends: 57 [2018-10-24 12:28:42,728 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:28:42,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-24 12:28:42,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2018-10-24 12:28:42,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-24 12:28:42,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2018-10-24 12:28:42,734 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 32 [2018-10-24 12:28:42,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:42,735 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2018-10-24 12:28:42,735 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:28:42,735 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2018-10-24 12:28:42,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-24 12:28:42,736 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:42,736 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:42,736 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:42,736 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:42,737 INFO L82 PathProgramCache]: Analyzing trace with hash 1051431133, now seen corresponding path program 7 times [2018-10-24 12:28:42,737 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:42,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:42,738 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:42,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:42,738 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:42,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:42,881 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:42,882 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:42,882 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:42,882 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:42,882 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:42,882 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:42,882 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:42,889 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:42,889 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:42,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:42,900 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:42,915 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:42,915 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:44,061 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:44,080 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:44,081 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-24 12:28:44,081 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:44,081 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:28:44,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:28:44,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:28:44,082 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 10 states. [2018-10-24 12:28:44,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:44,239 INFO L93 Difference]: Finished difference Result 65 states and 67 transitions. [2018-10-24 12:28:44,239 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:28:44,239 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-24 12:28:44,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:44,240 INFO L225 Difference]: With dead ends: 65 [2018-10-24 12:28:44,240 INFO L226 Difference]: Without dead ends: 60 [2018-10-24 12:28:44,241 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:28:44,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-24 12:28:44,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2018-10-24 12:28:44,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-24 12:28:44,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2018-10-24 12:28:44,248 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 32 [2018-10-24 12:28:44,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:44,248 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2018-10-24 12:28:44,248 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:28:44,248 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2018-10-24 12:28:44,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-24 12:28:44,249 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:44,249 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:44,250 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:44,250 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:44,250 INFO L82 PathProgramCache]: Analyzing trace with hash -1631958178, now seen corresponding path program 8 times [2018-10-24 12:28:44,250 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:44,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:44,251 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:44,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:44,251 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:44,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:44,490 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:44,490 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:44,490 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:44,490 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:44,491 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:44,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:44,491 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:44,498 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:44,498 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:47,365 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:28:47,365 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:47,369 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:47,393 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:47,394 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:49,002 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:49,023 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:49,024 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-24 12:28:49,024 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:49,024 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:28:49,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:28:49,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:28:49,025 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 11 states. [2018-10-24 12:28:49,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:49,261 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2018-10-24 12:28:49,264 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:28:49,264 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-10-24 12:28:49,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:49,266 INFO L225 Difference]: With dead ends: 68 [2018-10-24 12:28:49,266 INFO L226 Difference]: Without dead ends: 63 [2018-10-24 12:28:49,266 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:28:49,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-24 12:28:49,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2018-10-24 12:28:49,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-10-24 12:28:49,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2018-10-24 12:28:49,279 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 35 [2018-10-24 12:28:49,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:49,280 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2018-10-24 12:28:49,280 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:28:49,280 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2018-10-24 12:28:49,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-24 12:28:49,281 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:49,284 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:49,284 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:49,285 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:49,285 INFO L82 PathProgramCache]: Analyzing trace with hash 598101598, now seen corresponding path program 8 times [2018-10-24 12:28:49,285 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:49,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:49,286 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:49,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:49,286 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:49,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:49,620 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:49,620 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:49,620 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:49,620 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:49,621 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:49,621 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:49,621 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:49,629 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:49,629 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:49,822 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:28:49,822 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:49,825 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:49,842 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:49,842 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:52,322 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:52,342 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:52,343 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-24 12:28:52,343 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:52,343 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:28:52,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:28:52,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:28:52,344 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 11 states. [2018-10-24 12:28:52,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:52,514 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2018-10-24 12:28:52,514 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:28:52,514 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-10-24 12:28:52,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:52,515 INFO L225 Difference]: With dead ends: 71 [2018-10-24 12:28:52,515 INFO L226 Difference]: Without dead ends: 66 [2018-10-24 12:28:52,515 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:28:52,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-24 12:28:52,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2018-10-24 12:28:52,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-10-24 12:28:52,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2018-10-24 12:28:52,520 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 35 [2018-10-24 12:28:52,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:52,520 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2018-10-24 12:28:52,520 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:28:52,520 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2018-10-24 12:28:52,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-24 12:28:52,521 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:52,521 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:52,521 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:52,522 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:52,522 INFO L82 PathProgramCache]: Analyzing trace with hash 198410683, now seen corresponding path program 9 times [2018-10-24 12:28:52,522 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:52,522 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:52,523 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:52,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:52,523 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:52,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:52,792 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:52,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:52,792 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:52,792 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:52,792 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:52,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:52,793 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:52,802 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:52,802 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:52,820 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:52,820 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:52,821 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:52,829 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:52,830 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:54,114 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:54,135 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:54,136 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-24 12:28:54,136 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:54,136 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:28:54,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:28:54,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:28:54,137 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand 12 states. [2018-10-24 12:28:54,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:54,438 INFO L93 Difference]: Finished difference Result 74 states and 76 transitions. [2018-10-24 12:28:54,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:28:54,439 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-10-24 12:28:54,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:54,440 INFO L225 Difference]: With dead ends: 74 [2018-10-24 12:28:54,440 INFO L226 Difference]: Without dead ends: 69 [2018-10-24 12:28:54,441 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:28:54,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-24 12:28:54,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2018-10-24 12:28:54,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-10-24 12:28:54,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2018-10-24 12:28:54,445 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 38 [2018-10-24 12:28:54,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:54,445 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2018-10-24 12:28:54,445 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:28:54,446 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2018-10-24 12:28:54,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-24 12:28:54,446 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:54,446 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:54,447 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:54,447 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:54,447 INFO L82 PathProgramCache]: Analyzing trace with hash -1164896963, now seen corresponding path program 9 times [2018-10-24 12:28:54,447 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:54,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:54,448 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:54,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:54,448 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:54,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:54,659 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:54,659 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:54,659 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:54,659 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:54,659 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:54,660 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:54,660 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:54,668 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:54,668 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:54,679 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:54,679 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:54,681 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:54,697 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:54,697 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:56,290 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:56,311 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:56,312 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-24 12:28:56,312 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:56,312 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:28:56,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:28:56,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:28:56,313 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 12 states. [2018-10-24 12:28:56,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:56,519 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2018-10-24 12:28:56,520 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:28:56,520 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-10-24 12:28:56,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:56,521 INFO L225 Difference]: With dead ends: 77 [2018-10-24 12:28:56,521 INFO L226 Difference]: Without dead ends: 72 [2018-10-24 12:28:56,522 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:28:56,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-24 12:28:56,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2018-10-24 12:28:56,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-10-24 12:28:56,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2018-10-24 12:28:56,526 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 38 [2018-10-24 12:28:56,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:56,528 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2018-10-24 12:28:56,528 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:28:56,528 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2018-10-24 12:28:56,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-24 12:28:56,529 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:56,529 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:56,529 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:56,529 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:56,529 INFO L82 PathProgramCache]: Analyzing trace with hash -187641282, now seen corresponding path program 10 times [2018-10-24 12:28:56,529 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:56,530 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:56,530 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:56,530 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:56,530 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:56,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:57,110 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:57,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:57,111 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:57,111 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:57,111 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:57,111 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:57,111 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:57,119 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:57,119 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:57,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:57,134 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:57,149 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:57,149 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:00,228 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:00,248 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:00,249 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-24 12:29:00,249 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:00,249 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:29:00,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:29:00,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:29:00,250 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand 13 states. [2018-10-24 12:29:00,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:00,525 INFO L93 Difference]: Finished difference Result 80 states and 82 transitions. [2018-10-24 12:29:00,525 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:29:00,526 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-10-24 12:29:00,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:00,527 INFO L225 Difference]: With dead ends: 80 [2018-10-24 12:29:00,527 INFO L226 Difference]: Without dead ends: 75 [2018-10-24 12:29:00,528 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:29:00,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-24 12:29:00,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2018-10-24 12:29:00,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-24 12:29:00,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2018-10-24 12:29:00,534 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 41 [2018-10-24 12:29:00,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:00,534 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2018-10-24 12:29:00,534 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:29:00,534 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2018-10-24 12:29:00,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-24 12:29:00,535 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:00,535 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:00,535 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:00,535 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:00,536 INFO L82 PathProgramCache]: Analyzing trace with hash 500035070, now seen corresponding path program 10 times [2018-10-24 12:29:00,536 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:00,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:00,537 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:00,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:00,537 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:00,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:00,929 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:00,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:00,929 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:00,929 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:00,929 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:00,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:00,930 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:00,937 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:00,938 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:00,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:00,950 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:00,964 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:00,964 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:04,699 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:04,719 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:04,719 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-24 12:29:04,719 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:04,719 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:29:04,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:29:04,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:29:04,720 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 13 states. [2018-10-24 12:29:05,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:05,108 INFO L93 Difference]: Finished difference Result 83 states and 85 transitions. [2018-10-24 12:29:05,110 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:29:05,110 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-10-24 12:29:05,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:05,111 INFO L225 Difference]: With dead ends: 83 [2018-10-24 12:29:05,111 INFO L226 Difference]: Without dead ends: 78 [2018-10-24 12:29:05,112 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:29:05,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-24 12:29:05,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2018-10-24 12:29:05,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-24 12:29:05,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2018-10-24 12:29:05,116 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 41 [2018-10-24 12:29:05,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:05,116 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2018-10-24 12:29:05,116 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:29:05,116 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2018-10-24 12:29:05,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-24 12:29:05,117 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:05,117 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:05,117 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:05,117 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:05,117 INFO L82 PathProgramCache]: Analyzing trace with hash 860688091, now seen corresponding path program 11 times [2018-10-24 12:29:05,117 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:05,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:05,118 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:05,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:05,119 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:05,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:05,329 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:05,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:05,330 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:05,330 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:05,330 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:05,330 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:05,330 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:05,337 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:05,337 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:29:05,890 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:29:05,890 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:05,951 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:05,999 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:05,999 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:06,538 WARN L179 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:29:07,904 WARN L179 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:29:08,896 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:08,916 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:08,916 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 15] total 27 [2018-10-24 12:29:08,917 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:08,917 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:29:08,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:29:08,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:29:08,918 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand 14 states. [2018-10-24 12:29:09,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:09,545 INFO L93 Difference]: Finished difference Result 86 states and 88 transitions. [2018-10-24 12:29:09,546 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:29:09,546 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-10-24 12:29:09,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:09,547 INFO L225 Difference]: With dead ends: 86 [2018-10-24 12:29:09,547 INFO L226 Difference]: Without dead ends: 81 [2018-10-24 12:29:09,548 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:29:09,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-10-24 12:29:09,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2018-10-24 12:29:09,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-10-24 12:29:09,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2018-10-24 12:29:09,554 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 44 [2018-10-24 12:29:09,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:09,554 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2018-10-24 12:29:09,554 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:29:09,554 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2018-10-24 12:29:09,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-24 12:29:09,555 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:09,555 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:09,555 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:09,555 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:09,556 INFO L82 PathProgramCache]: Analyzing trace with hash -2087071331, now seen corresponding path program 11 times [2018-10-24 12:29:09,556 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:09,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:09,556 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:09,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:09,557 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:09,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:09,839 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:09,839 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:09,839 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:09,839 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:09,840 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:09,840 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:09,840 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:09,847 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:09,847 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:29:10,646 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:29:10,647 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:10,663 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:10,698 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:10,698 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:15,128 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:15,148 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:15,148 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-24 12:29:15,148 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:15,148 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:29:15,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:29:15,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:29:15,149 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 14 states. [2018-10-24 12:29:15,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:15,390 INFO L93 Difference]: Finished difference Result 89 states and 91 transitions. [2018-10-24 12:29:15,391 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:29:15,391 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-10-24 12:29:15,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:15,392 INFO L225 Difference]: With dead ends: 89 [2018-10-24 12:29:15,392 INFO L226 Difference]: Without dead ends: 84 [2018-10-24 12:29:15,393 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:29:15,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-24 12:29:15,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2018-10-24 12:29:15,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-10-24 12:29:15,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2018-10-24 12:29:15,398 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 44 [2018-10-24 12:29:15,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:15,398 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2018-10-24 12:29:15,398 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:29:15,399 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2018-10-24 12:29:15,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-24 12:29:15,399 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:15,399 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:15,399 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:15,400 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:15,400 INFO L82 PathProgramCache]: Analyzing trace with hash -1361137378, now seen corresponding path program 12 times [2018-10-24 12:29:15,400 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:15,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:15,401 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:15,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:15,401 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:15,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:16,382 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:16,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:16,382 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:16,382 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:16,382 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:16,383 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:16,383 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:16,390 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:16,390 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:16,403 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:16,404 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:16,405 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:16,430 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:16,431 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:19,135 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:19,155 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:19,155 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-24 12:29:19,155 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:19,155 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:29:19,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:29:19,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:29:19,156 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand 15 states. [2018-10-24 12:29:19,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:19,548 INFO L93 Difference]: Finished difference Result 92 states and 94 transitions. [2018-10-24 12:29:19,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:29:19,550 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-10-24 12:29:19,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:19,552 INFO L225 Difference]: With dead ends: 92 [2018-10-24 12:29:19,552 INFO L226 Difference]: Without dead ends: 87 [2018-10-24 12:29:19,553 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:29:19,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-24 12:29:19,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2018-10-24 12:29:19,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-10-24 12:29:19,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2018-10-24 12:29:19,557 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 47 [2018-10-24 12:29:19,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:19,558 INFO L481 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2018-10-24 12:29:19,558 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:29:19,558 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2018-10-24 12:29:19,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-24 12:29:19,559 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:19,559 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:19,559 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:19,559 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:19,559 INFO L82 PathProgramCache]: Analyzing trace with hash -1385736802, now seen corresponding path program 12 times [2018-10-24 12:29:19,559 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:19,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:19,560 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:19,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:19,560 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:19,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:19,972 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:19,972 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:19,972 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:19,972 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:19,972 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:19,972 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:19,973 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:19,979 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:19,980 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:19,992 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:19,992 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:19,993 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:20,008 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:20,009 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:22,830 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:22,850 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:22,850 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-24 12:29:22,850 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:22,851 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:29:22,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:29:22,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:29:22,852 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 15 states. [2018-10-24 12:29:23,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:23,120 INFO L93 Difference]: Finished difference Result 95 states and 97 transitions. [2018-10-24 12:29:23,120 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:29:23,120 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-10-24 12:29:23,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:23,122 INFO L225 Difference]: With dead ends: 95 [2018-10-24 12:29:23,122 INFO L226 Difference]: Without dead ends: 90 [2018-10-24 12:29:23,123 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:29:23,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-24 12:29:23,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2018-10-24 12:29:23,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-24 12:29:23,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2018-10-24 12:29:23,126 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 47 [2018-10-24 12:29:23,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:23,126 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2018-10-24 12:29:23,126 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:29:23,127 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2018-10-24 12:29:23,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-24 12:29:23,127 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:23,127 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:23,127 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:23,127 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:23,128 INFO L82 PathProgramCache]: Analyzing trace with hash -2022685701, now seen corresponding path program 13 times [2018-10-24 12:29:23,128 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:23,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:23,128 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:23,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:23,129 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:23,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:24,903 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:24,903 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:24,903 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:24,903 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:24,903 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:24,903 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:24,903 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:24,913 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:24,913 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:24,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:24,932 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:24,964 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:24,964 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:29,385 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:29,404 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:29,405 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-24 12:29:29,405 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:29,405 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:29:29,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:29:29,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:29:29,406 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand 16 states. [2018-10-24 12:29:29,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:29,957 INFO L93 Difference]: Finished difference Result 98 states and 100 transitions. [2018-10-24 12:29:29,957 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:29:29,957 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-10-24 12:29:29,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:29,959 INFO L225 Difference]: With dead ends: 98 [2018-10-24 12:29:29,959 INFO L226 Difference]: Without dead ends: 93 [2018-10-24 12:29:29,960 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:29:29,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-10-24 12:29:29,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2018-10-24 12:29:29,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-10-24 12:29:29,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2018-10-24 12:29:29,966 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 50 [2018-10-24 12:29:29,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:29,966 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2018-10-24 12:29:29,966 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:29:29,966 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2018-10-24 12:29:29,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-24 12:29:29,967 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:29,967 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:29,967 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:29,967 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:29,967 INFO L82 PathProgramCache]: Analyzing trace with hash 1350288893, now seen corresponding path program 13 times [2018-10-24 12:29:29,968 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:29,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:29,968 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:29,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:29,969 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:29,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:30,938 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:30,938 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:30,938 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:30,938 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:30,939 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:30,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:30,939 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:30,946 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:30,946 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:30,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:30,963 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:30,976 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:30,976 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:38,492 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:38,522 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:38,522 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-24 12:29:38,522 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:38,523 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:29:38,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:29:38,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=616, Unknown=1, NotChecked=0, Total=870 [2018-10-24 12:29:38,524 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand 16 states. [2018-10-24 12:29:38,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:38,891 INFO L93 Difference]: Finished difference Result 101 states and 103 transitions. [2018-10-24 12:29:38,891 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:29:38,891 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-10-24 12:29:38,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:38,892 INFO L225 Difference]: With dead ends: 101 [2018-10-24 12:29:38,893 INFO L226 Difference]: Without dead ends: 96 [2018-10-24 12:29:38,894 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=253, Invalid=616, Unknown=1, NotChecked=0, Total=870 [2018-10-24 12:29:38,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-24 12:29:38,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2018-10-24 12:29:38,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-10-24 12:29:38,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2018-10-24 12:29:38,900 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 50 [2018-10-24 12:29:38,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:38,900 INFO L481 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2018-10-24 12:29:38,900 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:29:38,900 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2018-10-24 12:29:38,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-24 12:29:38,901 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:38,901 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:38,901 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:38,901 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:38,901 INFO L82 PathProgramCache]: Analyzing trace with hash -603854850, now seen corresponding path program 14 times [2018-10-24 12:29:38,901 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:38,902 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:38,902 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:38,902 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:38,902 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:38,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:39,945 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:39,945 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:39,945 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:39,945 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:39,945 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:39,945 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:39,945 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:39,952 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:39,952 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:29:46,632 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-24 12:29:46,632 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:46,829 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:46,843 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:46,843 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:53,646 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:53,667 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:53,667 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-24 12:29:53,667 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:53,667 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:29:53,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:29:53,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:29:53,668 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand 17 states. [2018-10-24 12:29:54,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:54,103 INFO L93 Difference]: Finished difference Result 104 states and 106 transitions. [2018-10-24 12:29:54,103 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:29:54,103 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-10-24 12:29:54,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:54,104 INFO L225 Difference]: With dead ends: 104 [2018-10-24 12:29:54,104 INFO L226 Difference]: Without dead ends: 99 [2018-10-24 12:29:54,106 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:29:54,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-10-24 12:29:54,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2018-10-24 12:29:54,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-10-24 12:29:54,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 100 transitions. [2018-10-24 12:29:54,111 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 100 transitions. Word has length 53 [2018-10-24 12:29:54,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:54,111 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 100 transitions. [2018-10-24 12:29:54,111 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:29:54,111 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 100 transitions. [2018-10-24 12:29:54,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-24 12:29:54,112 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:54,112 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:54,112 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:54,112 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:54,112 INFO L82 PathProgramCache]: Analyzing trace with hash 402425150, now seen corresponding path program 14 times [2018-10-24 12:29:54,112 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:54,113 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:54,113 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:54,113 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:54,113 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:54,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:54,740 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:54,740 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:54,740 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:54,741 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:54,741 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:54,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:54,741 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:54,749 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:54,749 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:29:55,541 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-24 12:29:55,541 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:55,544 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:55,616 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:55,616 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:55,896 WARN L179 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:29:57,481 WARN L179 SmtUtils]: Spent 906.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:29:57,914 WARN L179 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:29:58,873 WARN L179 SmtUtils]: Spent 330.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:29:59,118 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:30:00,833 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:00,854 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:00,854 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 18] total 33 [2018-10-24 12:30:00,854 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:00,855 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:30:00,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:30:00,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=752, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:30:00,856 INFO L87 Difference]: Start difference. First operand 98 states and 100 transitions. Second operand 17 states. [2018-10-24 12:30:01,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:01,196 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2018-10-24 12:30:01,196 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:30:01,196 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-10-24 12:30:01,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:01,197 INFO L225 Difference]: With dead ends: 107 [2018-10-24 12:30:01,198 INFO L226 Difference]: Without dead ends: 102 [2018-10-24 12:30:01,199 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 89 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=304, Invalid=752, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:30:01,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-10-24 12:30:01,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2018-10-24 12:30:01,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-10-24 12:30:01,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2018-10-24 12:30:01,204 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 53 [2018-10-24 12:30:01,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:01,204 INFO L481 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2018-10-24 12:30:01,204 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:30:01,204 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2018-10-24 12:30:01,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-24 12:30:01,205 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:01,205 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:01,205 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:01,205 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:01,206 INFO L82 PathProgramCache]: Analyzing trace with hash 1012867355, now seen corresponding path program 15 times [2018-10-24 12:30:01,206 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:01,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:01,206 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:30:01,207 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:01,207 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:01,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:01,921 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:01,921 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:01,921 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:01,921 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:01,922 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:01,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:01,922 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:01,929 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:30:01,930 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:30:01,959 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:30:01,959 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:30:01,961 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:02,024 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:02,024 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:11,909 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:11,928 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:11,929 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-24 12:30:11,929 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:11,929 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:30:11,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:30:11,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=800, Unknown=1, NotChecked=0, Total=1122 [2018-10-24 12:30:11,930 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand 18 states. [2018-10-24 12:30:12,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:12,412 INFO L93 Difference]: Finished difference Result 110 states and 112 transitions. [2018-10-24 12:30:12,412 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:30:12,413 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-10-24 12:30:12,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:12,414 INFO L225 Difference]: With dead ends: 110 [2018-10-24 12:30:12,414 INFO L226 Difference]: Without dead ends: 105 [2018-10-24 12:30:12,415 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=321, Invalid=800, Unknown=1, NotChecked=0, Total=1122 [2018-10-24 12:30:12,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-24 12:30:12,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 104. [2018-10-24 12:30:12,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2018-10-24 12:30:12,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 106 transitions. [2018-10-24 12:30:12,420 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 106 transitions. Word has length 56 [2018-10-24 12:30:12,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:12,420 INFO L481 AbstractCegarLoop]: Abstraction has 104 states and 106 transitions. [2018-10-24 12:30:12,420 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:30:12,421 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 106 transitions. [2018-10-24 12:30:12,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-24 12:30:12,421 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:12,421 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:12,422 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:12,422 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:12,422 INFO L82 PathProgramCache]: Analyzing trace with hash 2003628637, now seen corresponding path program 15 times [2018-10-24 12:30:12,422 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:12,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:12,423 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:30:12,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:12,423 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:12,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:12,839 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:12,839 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:12,839 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:12,839 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:12,839 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:12,839 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:12,839 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:12,847 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:30:12,847 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:30:12,864 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:30:12,864 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:30:12,866 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:12,875 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:12,876 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:20,153 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:20,173 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:20,173 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-24 12:30:20,174 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:20,174 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:30:20,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:30:20,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:30:20,175 INFO L87 Difference]: Start difference. First operand 104 states and 106 transitions. Second operand 18 states. [2018-10-24 12:30:20,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:20,561 INFO L93 Difference]: Finished difference Result 113 states and 115 transitions. [2018-10-24 12:30:20,561 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:30:20,561 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-10-24 12:30:20,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:20,562 INFO L225 Difference]: With dead ends: 113 [2018-10-24 12:30:20,562 INFO L226 Difference]: Without dead ends: 108 [2018-10-24 12:30:20,563 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:30:20,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2018-10-24 12:30:20,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2018-10-24 12:30:20,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-10-24 12:30:20,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2018-10-24 12:30:20,568 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 56 [2018-10-24 12:30:20,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:20,569 INFO L481 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2018-10-24 12:30:20,569 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:30:20,569 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2018-10-24 12:30:20,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:30:20,570 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:20,570 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:20,570 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:20,570 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:20,570 INFO L82 PathProgramCache]: Analyzing trace with hash 1020819166, now seen corresponding path program 16 times [2018-10-24 12:30:20,570 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:20,571 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:20,571 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:30:20,571 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:20,571 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:20,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:21,305 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:21,305 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:21,305 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:21,305 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:21,306 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:21,306 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:21,306 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:21,312 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:30:21,312 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:30:21,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:21,333 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:21,380 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:21,380 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:29,128 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:29,147 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:29,147 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-24 12:30:29,147 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:29,147 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:30:29,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:30:29,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:30:29,148 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand 19 states. [2018-10-24 12:30:29,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:29,729 INFO L93 Difference]: Finished difference Result 116 states and 118 transitions. [2018-10-24 12:30:29,730 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:30:29,730 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-10-24 12:30:29,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:29,731 INFO L225 Difference]: With dead ends: 116 [2018-10-24 12:30:29,731 INFO L226 Difference]: Without dead ends: 111 [2018-10-24 12:30:29,732 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:30:29,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-10-24 12:30:29,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 110. [2018-10-24 12:30:29,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-10-24 12:30:29,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 112 transitions. [2018-10-24 12:30:29,736 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 112 transitions. Word has length 59 [2018-10-24 12:30:29,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:29,736 INFO L481 AbstractCegarLoop]: Abstraction has 110 states and 112 transitions. [2018-10-24 12:30:29,736 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:30:29,737 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 112 transitions. [2018-10-24 12:30:29,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:30:29,737 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:29,737 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:29,738 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:29,738 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:29,738 INFO L82 PathProgramCache]: Analyzing trace with hash -745046818, now seen corresponding path program 16 times [2018-10-24 12:30:29,738 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:29,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:29,739 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:30:29,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:29,739 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:29,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:30,398 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:30,398 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:30,399 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:30,399 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:30,399 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:30,399 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:30,399 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:30,408 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:30:30,408 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:30:30,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:30,438 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:30,485 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:30,486 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:41,929 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 389 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:41,948 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:41,948 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-24 12:30:41,949 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:41,949 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:30:41,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:30:41,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=901, Unknown=1, NotChecked=0, Total=1260 [2018-10-24 12:30:41,950 INFO L87 Difference]: Start difference. First operand 110 states and 112 transitions. Second operand 19 states. [2018-10-24 12:30:42,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:42,405 INFO L93 Difference]: Finished difference Result 119 states and 121 transitions. [2018-10-24 12:30:42,406 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:30:42,406 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-10-24 12:30:42,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:42,407 INFO L225 Difference]: With dead ends: 119 [2018-10-24 12:30:42,407 INFO L226 Difference]: Without dead ends: 114 [2018-10-24 12:30:42,408 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=358, Invalid=901, Unknown=1, NotChecked=0, Total=1260 [2018-10-24 12:30:42,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-24 12:30:42,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2018-10-24 12:30:42,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2018-10-24 12:30:42,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 115 transitions. [2018-10-24 12:30:42,413 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 115 transitions. Word has length 59 [2018-10-24 12:30:42,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:42,414 INFO L481 AbstractCegarLoop]: Abstraction has 113 states and 115 transitions. [2018-10-24 12:30:42,414 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:30:42,414 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 115 transitions. [2018-10-24 12:30:42,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-24 12:30:42,414 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:42,415 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:42,415 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:42,415 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:42,415 INFO L82 PathProgramCache]: Analyzing trace with hash 1690019387, now seen corresponding path program 17 times [2018-10-24 12:30:42,415 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:42,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:42,416 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:30:42,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:42,416 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:42,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:42,706 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:42,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:42,707 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:42,707 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:42,707 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:42,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:42,707 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:42,714 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:30:42,714 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:30:47,093 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-24 12:30:47,093 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:30:47,109 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:47,120 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:47,120 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:57,738 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:57,758 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:57,758 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-24 12:30:57,758 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:57,758 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:30:57,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:30:57,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:30:57,759 INFO L87 Difference]: Start difference. First operand 113 states and 115 transitions. Second operand 20 states. [2018-10-24 12:30:58,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:58,352 INFO L93 Difference]: Finished difference Result 122 states and 124 transitions. [2018-10-24 12:30:58,352 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:30:58,353 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-10-24 12:30:58,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:58,354 INFO L225 Difference]: With dead ends: 122 [2018-10-24 12:30:58,354 INFO L226 Difference]: Without dead ends: 117 [2018-10-24 12:30:58,355 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:30:58,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-10-24 12:30:58,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2018-10-24 12:30:58,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2018-10-24 12:30:58,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 118 transitions. [2018-10-24 12:30:58,360 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 118 transitions. Word has length 62 [2018-10-24 12:30:58,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:58,360 INFO L481 AbstractCegarLoop]: Abstraction has 116 states and 118 transitions. [2018-10-24 12:30:58,360 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:30:58,360 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 118 transitions. [2018-10-24 12:30:58,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-24 12:30:58,361 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:58,361 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:58,361 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:58,362 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:58,362 INFO L82 PathProgramCache]: Analyzing trace with hash 1310938813, now seen corresponding path program 17 times [2018-10-24 12:30:58,362 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:58,362 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:58,362 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:30:58,363 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:58,363 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:58,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:58,646 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:58,646 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:58,646 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:58,647 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:58,647 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:58,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:58,647 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:58,655 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:30:58,655 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:31:19,825 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-24 12:31:19,826 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:31:19,857 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:31:19,911 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:19,911 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:31:21,103 WARN L179 SmtUtils]: Spent 948.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:31:21,440 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:31:22,507 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:31:27,122 WARN L179 SmtUtils]: Spent 965.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:31:27,341 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:27,361 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:31:27,362 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 21] total 39 [2018-10-24 12:31:27,362 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:31:27,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:31:27,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:31:27,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=418, Invalid=1064, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:31:27,363 INFO L87 Difference]: Start difference. First operand 116 states and 118 transitions. Second operand 20 states. [2018-10-24 12:31:27,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:31:27,855 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2018-10-24 12:31:27,855 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:31:27,856 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-10-24 12:31:27,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:31:27,857 INFO L225 Difference]: With dead ends: 125 [2018-10-24 12:31:27,857 INFO L226 Difference]: Without dead ends: 120 [2018-10-24 12:31:27,858 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 102 SyntacticMatches, 5 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=418, Invalid=1064, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:31:27,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-10-24 12:31:27,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2018-10-24 12:31:27,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-10-24 12:31:27,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2018-10-24 12:31:27,863 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 62 [2018-10-24 12:31:27,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:31:27,864 INFO L481 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2018-10-24 12:31:27,864 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:31:27,864 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2018-10-24 12:31:27,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-24 12:31:27,864 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:31:27,864 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:31:27,865 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:31:27,865 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:31:27,865 INFO L82 PathProgramCache]: Analyzing trace with hash 595615166, now seen corresponding path program 18 times [2018-10-24 12:31:27,865 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:31:27,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:27,866 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:31:27,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:27,866 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:31:27,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:31:28,221 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:28,222 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:28,222 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:31:28,222 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:31:28,222 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:31:28,222 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:28,222 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:31:28,229 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:31:28,229 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:31:28,252 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:31:28,252 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:31:28,253 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:31:28,287 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:28,287 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:31:41,533 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:41,553 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:31:41,553 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-24 12:31:41,553 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:31:41,553 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:31:41,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:31:41,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1121, Unknown=1, NotChecked=0, Total=1560 [2018-10-24 12:31:41,554 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand 21 states. [2018-10-24 12:31:42,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:31:42,206 INFO L93 Difference]: Finished difference Result 128 states and 130 transitions. [2018-10-24 12:31:42,206 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:31:42,207 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-10-24 12:31:42,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:31:42,208 INFO L225 Difference]: With dead ends: 128 [2018-10-24 12:31:42,208 INFO L226 Difference]: Without dead ends: 123 [2018-10-24 12:31:42,209 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=438, Invalid=1121, Unknown=1, NotChecked=0, Total=1560 [2018-10-24 12:31:42,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-24 12:31:42,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2018-10-24 12:31:42,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-10-24 12:31:42,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 124 transitions. [2018-10-24 12:31:42,217 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 124 transitions. Word has length 65 [2018-10-24 12:31:42,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:31:42,217 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 124 transitions. [2018-10-24 12:31:42,217 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:31:42,217 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 124 transitions. [2018-10-24 12:31:42,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-24 12:31:42,218 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:31:42,218 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:31:42,218 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:31:42,218 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:31:42,219 INFO L82 PathProgramCache]: Analyzing trace with hash 650263678, now seen corresponding path program 18 times [2018-10-24 12:31:42,219 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:31:42,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:42,219 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:31:42,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:42,220 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:31:42,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:31:42,733 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:42,733 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:42,734 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:31:42,734 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:31:42,734 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:31:42,734 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:42,734 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:31:42,741 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:31:42,741 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:31:42,757 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:31:42,757 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:31:42,759 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:31:42,769 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:42,769 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:31:55,616 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:55,636 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:31:55,636 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-24 12:31:55,636 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:31:55,637 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:31:55,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:31:55,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:31:55,638 INFO L87 Difference]: Start difference. First operand 122 states and 124 transitions. Second operand 21 states. [2018-10-24 12:31:56,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:31:56,249 INFO L93 Difference]: Finished difference Result 131 states and 133 transitions. [2018-10-24 12:31:56,249 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:31:56,249 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-10-24 12:31:56,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:31:56,251 INFO L225 Difference]: With dead ends: 131 [2018-10-24 12:31:56,251 INFO L226 Difference]: Without dead ends: 126 [2018-10-24 12:31:56,252 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:31:56,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-10-24 12:31:56,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2018-10-24 12:31:56,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2018-10-24 12:31:56,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 127 transitions. [2018-10-24 12:31:56,258 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 127 transitions. Word has length 65 [2018-10-24 12:31:56,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:31:56,258 INFO L481 AbstractCegarLoop]: Abstraction has 125 states and 127 transitions. [2018-10-24 12:31:56,258 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:31:56,258 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 127 transitions. [2018-10-24 12:31:56,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-24 12:31:56,259 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:31:56,259 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:31:56,259 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:31:56,259 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:31:56,259 INFO L82 PathProgramCache]: Analyzing trace with hash 296211291, now seen corresponding path program 19 times [2018-10-24 12:31:56,259 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:31:56,260 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:56,260 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:31:56,260 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:56,260 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:31:56,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:31:56,982 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:56,982 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:56,983 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:31:56,983 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:31:56,983 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:31:56,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:56,983 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:31:56,990 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:31:56,990 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:31:57,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:31:57,013 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:31:57,025 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:57,025 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:32:07,207 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:07,226 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:32:07,226 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-24 12:32:07,226 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:32:07,226 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:32:07,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:32:07,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:32:07,227 INFO L87 Difference]: Start difference. First operand 125 states and 127 transitions. Second operand 22 states. [2018-10-24 12:32:08,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:32:08,298 INFO L93 Difference]: Finished difference Result 134 states and 136 transitions. [2018-10-24 12:32:08,299 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:32:08,300 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-10-24 12:32:08,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:32:08,301 INFO L225 Difference]: With dead ends: 134 [2018-10-24 12:32:08,301 INFO L226 Difference]: Without dead ends: 129 [2018-10-24 12:32:08,303 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:32:08,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-10-24 12:32:08,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 128. [2018-10-24 12:32:08,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:32:08,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 130 transitions. [2018-10-24 12:32:08,309 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 130 transitions. Word has length 68 [2018-10-24 12:32:08,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:32:08,309 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 130 transitions. [2018-10-24 12:32:08,309 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:32:08,309 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 130 transitions. [2018-10-24 12:32:08,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-24 12:32:08,310 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:32:08,310 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:32:08,310 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:32:08,311 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:32:08,311 INFO L82 PathProgramCache]: Analyzing trace with hash -1982532835, now seen corresponding path program 19 times [2018-10-24 12:32:08,311 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:32:08,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:08,312 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:32:08,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:08,312 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:32:08,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:09,036 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:09,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:09,037 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:32:09,037 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:32:09,037 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:32:09,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:09,037 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:32:09,046 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:32:09,046 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:32:09,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:09,067 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:32:09,078 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:09,078 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:32:22,531 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:22,549 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:32:22,550 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-24 12:32:22,550 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:32:22,550 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:32:22,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:32:22,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:32:22,551 INFO L87 Difference]: Start difference. First operand 128 states and 130 transitions. Second operand 22 states. [2018-10-24 12:32:23,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:32:23,130 INFO L93 Difference]: Finished difference Result 137 states and 139 transitions. [2018-10-24 12:32:23,130 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:32:23,130 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-10-24 12:32:23,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:32:23,131 INFO L225 Difference]: With dead ends: 137 [2018-10-24 12:32:23,131 INFO L226 Difference]: Without dead ends: 132 [2018-10-24 12:32:23,132 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:32:23,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-10-24 12:32:23,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131. [2018-10-24 12:32:23,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-10-24 12:32:23,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2018-10-24 12:32:23,136 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 68 [2018-10-24 12:32:23,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:32:23,136 INFO L481 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2018-10-24 12:32:23,136 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:32:23,136 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2018-10-24 12:32:23,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-24 12:32:23,136 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:32:23,137 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:32:23,137 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:32:23,137 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:32:23,137 INFO L82 PathProgramCache]: Analyzing trace with hash 1402444958, now seen corresponding path program 20 times [2018-10-24 12:32:23,137 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:32:23,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:23,138 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:32:23,138 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:23,138 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:32:23,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:23,659 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:23,660 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:23,660 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:32:23,660 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:32:23,660 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:32:23,660 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:23,660 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:32:23,667 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:32:23,667 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:32:35,433 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-24 12:32:35,434 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:32:35,475 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:32:35,487 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:35,487 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:32:52,545 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 607 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:52,565 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:32:52,566 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-24 12:32:52,566 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:32:52,566 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:32:52,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:32:52,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1365, Unknown=1, NotChecked=0, Total=1892 [2018-10-24 12:32:52,567 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand 23 states. [2018-10-24 12:32:53,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:32:53,383 INFO L93 Difference]: Finished difference Result 140 states and 142 transitions. [2018-10-24 12:32:53,383 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:32:53,383 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 71 [2018-10-24 12:32:53,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:32:53,385 INFO L225 Difference]: With dead ends: 140 [2018-10-24 12:32:53,385 INFO L226 Difference]: Without dead ends: 135 [2018-10-24 12:32:53,386 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 121 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 17.5s TimeCoverageRelationStatistics Valid=526, Invalid=1365, Unknown=1, NotChecked=0, Total=1892 [2018-10-24 12:32:53,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-10-24 12:32:53,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 134. [2018-10-24 12:32:53,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2018-10-24 12:32:53,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 136 transitions. [2018-10-24 12:32:53,392 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 136 transitions. Word has length 71 [2018-10-24 12:32:53,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:32:53,393 INFO L481 AbstractCegarLoop]: Abstraction has 134 states and 136 transitions. [2018-10-24 12:32:53,393 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:32:53,393 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 136 transitions. [2018-10-24 12:32:53,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-24 12:32:53,393 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:32:53,393 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:32:53,394 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:32:53,394 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:32:53,394 INFO L82 PathProgramCache]: Analyzing trace with hash -930692066, now seen corresponding path program 20 times [2018-10-24 12:32:53,394 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:32:53,395 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:53,395 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:32:53,395 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:53,395 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:32:53,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:53,826 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:53,826 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:53,826 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:32:53,826 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:32:53,826 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:32:53,826 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:53,826 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:32:53,833 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:32:53,833 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown