java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT-LIM.epf -i ../../../trunk/examples/svcomp/loop-invgen/down_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 22:10:47,320 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 22:10:47,325 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 22:10:47,337 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 22:10:47,338 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 22:10:47,340 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 22:10:47,341 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 22:10:47,343 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 22:10:47,347 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 22:10:47,348 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 22:10:47,349 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 22:10:47,349 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 22:10:47,350 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 22:10:47,358 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 22:10:47,363 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 22:10:47,364 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 22:10:47,365 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 22:10:47,367 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 22:10:47,369 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 22:10:47,370 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 22:10:47,371 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 22:10:47,373 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 22:10:47,375 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 22:10:47,375 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 22:10:47,375 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 22:10:47,376 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 22:10:47,377 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 22:10:47,378 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 22:10:47,378 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 22:10:47,379 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 22:10:47,380 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 22:10:47,380 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-11-07 22:10:47,383 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT-LIM.epf [2018-11-07 22:10:47,397 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 22:10:47,398 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 22:10:47,398 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 22:10:47,399 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 22:10:47,399 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 22:10:47,399 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 22:10:47,399 INFO L133 SettingsManager]: * Maximum recursion depth of evaluation operations=6 [2018-11-07 22:10:47,399 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 22:10:47,400 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 22:10:47,400 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 22:10:47,400 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 22:10:47,400 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 22:10:47,400 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 22:10:47,401 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 22:10:47,401 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 22:10:47,401 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 22:10:47,401 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 22:10:47,402 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 22:10:47,402 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 22:10:47,402 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 22:10:47,402 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 22:10:47,402 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 22:10:47,403 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 22:10:47,403 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 22:10:47,403 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 22:10:47,403 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 22:10:47,403 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 22:10:47,404 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 22:10:47,404 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 22:10:47,404 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 22:10:47,404 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 22:10:47,404 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 22:10:47,405 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 22:10:47,405 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 22:10:47,405 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 22:10:47,475 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 22:10:47,490 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 22:10:47,494 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 22:10:47,496 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 22:10:47,496 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 22:10:47,497 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/down_true-unreach-call_true-termination.i [2018-11-07 22:10:47,557 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8f8cf6d04/928a03d4cf1a4f4896cc7afa047843e2/FLAGe73a093f1 [2018-11-07 22:10:47,960 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 22:10:47,961 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/down_true-unreach-call_true-termination.i [2018-11-07 22:10:47,966 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8f8cf6d04/928a03d4cf1a4f4896cc7afa047843e2/FLAGe73a093f1 [2018-11-07 22:10:47,984 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8f8cf6d04/928a03d4cf1a4f4896cc7afa047843e2 [2018-11-07 22:10:47,997 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 22:10:47,998 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 22:10:47,999 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 22:10:47,999 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 22:10:48,004 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 22:10:48,005 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:10:47" (1/1) ... [2018-11-07 22:10:48,009 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@77208eeb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:10:48, skipping insertion in model container [2018-11-07 22:10:48,009 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:10:47" (1/1) ... [2018-11-07 22:10:48,019 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 22:10:48,042 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 22:10:48,275 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:10:48,280 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 22:10:48,300 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:10:48,318 INFO L193 MainTranslator]: Completed translation [2018-11-07 22:10:48,319 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:10:48 WrapperNode [2018-11-07 22:10:48,319 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 22:10:48,320 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 22:10:48,320 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 22:10:48,320 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 22:10:48,330 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:10:48" (1/1) ... [2018-11-07 22:10:48,339 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:10:48" (1/1) ... [2018-11-07 22:10:48,346 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 22:10:48,346 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 22:10:48,346 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 22:10:48,347 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 22:10:48,357 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:10:48" (1/1) ... [2018-11-07 22:10:48,357 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:10:48" (1/1) ... [2018-11-07 22:10:48,358 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:10:48" (1/1) ... [2018-11-07 22:10:48,358 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:10:48" (1/1) ... [2018-11-07 22:10:48,362 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:10:48" (1/1) ... [2018-11-07 22:10:48,368 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:10:48" (1/1) ... [2018-11-07 22:10:48,369 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:10:48" (1/1) ... [2018-11-07 22:10:48,373 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 22:10:48,374 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 22:10:48,374 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 22:10:48,374 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 22:10:48,375 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:10:48" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 22:10:48,492 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 22:10:48,493 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 22:10:48,493 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 22:10:48,493 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 22:10:48,493 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 22:10:48,493 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 22:10:48,493 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 22:10:48,494 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 22:10:48,738 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 22:10:48,738 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:10:48 BoogieIcfgContainer [2018-11-07 22:10:48,738 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 22:10:48,739 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 22:10:48,739 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 22:10:48,743 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 22:10:48,743 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 10:10:47" (1/3) ... [2018-11-07 22:10:48,744 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@725594e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:10:48, skipping insertion in model container [2018-11-07 22:10:48,744 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:10:48" (2/3) ... [2018-11-07 22:10:48,744 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@725594e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:10:48, skipping insertion in model container [2018-11-07 22:10:48,744 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:10:48" (3/3) ... [2018-11-07 22:10:48,746 INFO L112 eAbstractionObserver]: Analyzing ICFG down_true-unreach-call_true-termination.i [2018-11-07 22:10:48,756 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 22:10:48,763 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 22:10:48,779 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 22:10:48,815 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 22:10:48,815 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 22:10:48,815 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 22:10:48,815 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 22:10:48,815 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 22:10:48,816 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 22:10:48,816 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 22:10:48,816 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 22:10:48,837 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2018-11-07 22:10:48,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-07 22:10:48,844 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:10:48,845 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:10:48,849 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:10:48,855 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:10:48,856 INFO L82 PathProgramCache]: Analyzing trace with hash 123585964, now seen corresponding path program 1 times [2018-11-07 22:10:48,858 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:10:48,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:48,912 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:10:48,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:48,912 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:10:48,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:10:48,982 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:10:48,984 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:10:48,984 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 22:10:48,984 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:10:48,988 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 22:10:48,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 22:10:48,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 22:10:49,002 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 2 states. [2018-11-07 22:10:49,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:10:49,025 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2018-11-07 22:10:49,025 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 22:10:49,027 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-11-07 22:10:49,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:10:49,035 INFO L225 Difference]: With dead ends: 39 [2018-11-07 22:10:49,036 INFO L226 Difference]: Without dead ends: 18 [2018-11-07 22:10:49,039 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 22:10:49,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-11-07 22:10:49,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-11-07 22:10:49,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-11-07 22:10:49,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-11-07 22:10:49,081 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-11-07 22:10:49,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:10:49,081 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-11-07 22:10:49,081 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 22:10:49,082 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-11-07 22:10:49,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-11-07 22:10:49,083 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:10:49,083 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:10:49,083 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:10:49,084 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:10:49,084 INFO L82 PathProgramCache]: Analyzing trace with hash -203615370, now seen corresponding path program 1 times [2018-11-07 22:10:49,084 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:10:49,086 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:49,087 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:10:49,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:49,087 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:10:49,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:10:49,387 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:10:49,387 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:10:49,387 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-07 22:10:49,388 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:10:49,390 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-07 22:10:49,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-07 22:10:49,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-07 22:10:49,391 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 5 states. [2018-11-07 22:10:49,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:10:49,526 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2018-11-07 22:10:49,526 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 22:10:49,527 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2018-11-07 22:10:49,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:10:49,528 INFO L225 Difference]: With dead ends: 33 [2018-11-07 22:10:49,528 INFO L226 Difference]: Without dead ends: 20 [2018-11-07 22:10:49,529 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-11-07 22:10:49,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-11-07 22:10:49,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-11-07 22:10:49,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-11-07 22:10:49,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2018-11-07 22:10:49,535 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 14 [2018-11-07 22:10:49,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:10:49,536 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2018-11-07 22:10:49,536 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-07 22:10:49,536 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2018-11-07 22:10:49,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-11-07 22:10:49,537 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:10:49,537 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:10:49,540 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:10:49,540 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:10:49,540 INFO L82 PathProgramCache]: Analyzing trace with hash 1025157488, now seen corresponding path program 1 times [2018-11-07 22:10:49,541 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:10:49,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:49,543 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:10:49,543 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:49,543 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:10:49,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:10:49,668 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:10:49,668 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:10:49,668 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-11-07 22:10:49,668 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:10:49,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 22:10:49,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 22:10:49,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-11-07 22:10:49,670 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 6 states. [2018-11-07 22:10:49,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:10:49,874 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2018-11-07 22:10:49,875 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 22:10:49,875 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2018-11-07 22:10:49,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:10:49,878 INFO L225 Difference]: With dead ends: 34 [2018-11-07 22:10:49,878 INFO L226 Difference]: Without dead ends: 32 [2018-11-07 22:10:49,879 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-11-07 22:10:49,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-11-07 22:10:49,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 27. [2018-11-07 22:10:49,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-11-07 22:10:49,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-11-07 22:10:49,890 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 16 [2018-11-07 22:10:49,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:10:49,890 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-11-07 22:10:49,891 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 22:10:49,891 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-11-07 22:10:49,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-11-07 22:10:49,892 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:10:49,892 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:10:49,892 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:10:49,892 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:10:49,893 INFO L82 PathProgramCache]: Analyzing trace with hash -1392733261, now seen corresponding path program 1 times [2018-11-07 22:10:49,893 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:10:49,894 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:49,894 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:10:49,894 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:49,894 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:10:49,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:10:50,046 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:10:50,047 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:50,047 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:10:50,048 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-11-07 22:10:50,050 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [18], [22], [28], [30], [36], [39], [41], [44], [46], [47], [48], [49], [51], [52] [2018-11-07 22:10:50,083 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 22:10:50,083 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 22:10:50,342 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 22:10:50,343 INFO L272 AbstractInterpreter]: Visited 19 different actions 95 times. Merged at 8 different actions 40 times. Widened at 3 different actions 4 times. Found 7 fixpoints after 3 different actions. Largest state had 9 variables. [2018-11-07 22:10:50,375 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:10:50,377 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 22:10:50,377 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:50,377 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:10:50,393 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:10:50,393 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:10:50,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:10:50,435 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:10:50,461 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:10:50,461 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:10:50,568 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:10:50,592 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:10:50,592 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 7 [2018-11-07 22:10:50,592 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:10:50,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-07 22:10:50,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-07 22:10:50,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-11-07 22:10:50,594 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 7 states. [2018-11-07 22:10:50,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:10:50,845 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2018-11-07 22:10:50,845 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-07 22:10:50,845 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2018-11-07 22:10:50,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:10:50,848 INFO L225 Difference]: With dead ends: 46 [2018-11-07 22:10:50,848 INFO L226 Difference]: Without dead ends: 29 [2018-11-07 22:10:50,849 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 45 SyntacticMatches, 4 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2018-11-07 22:10:50,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-11-07 22:10:50,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-11-07 22:10:50,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-11-07 22:10:50,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2018-11-07 22:10:50,856 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 24 [2018-11-07 22:10:50,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:10:50,856 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2018-11-07 22:10:50,856 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-07 22:10:50,856 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2018-11-07 22:10:50,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-11-07 22:10:50,858 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:10:50,858 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:10:50,858 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:10:50,858 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:10:50,859 INFO L82 PathProgramCache]: Analyzing trace with hash -782599891, now seen corresponding path program 2 times [2018-11-07 22:10:50,859 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:10:50,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:50,860 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:10:50,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:50,860 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:10:50,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:10:50,983 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:10:50,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:50,984 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:10:50,984 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:10:50,984 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:10:50,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:50,985 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:10:50,997 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:10:50,997 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:10:51,033 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 22:10:51,033 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:10:51,037 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:10:51,141 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:10:51,141 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:10:51,234 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:10:51,254 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:10:51,254 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 10 [2018-11-07 22:10:51,254 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:10:51,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 22:10:51,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 22:10:51,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2018-11-07 22:10:51,256 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 10 states. [2018-11-07 22:10:51,579 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 7 DAG size of output: 6 [2018-11-07 22:10:51,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:10:51,664 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2018-11-07 22:10:51,664 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-07 22:10:51,665 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2018-11-07 22:10:51,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:10:51,667 INFO L225 Difference]: With dead ends: 39 [2018-11-07 22:10:51,667 INFO L226 Difference]: Without dead ends: 37 [2018-11-07 22:10:51,668 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 49 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2018-11-07 22:10:51,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-11-07 22:10:51,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-11-07 22:10:51,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-11-07 22:10:51,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2018-11-07 22:10:51,675 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 26 [2018-11-07 22:10:51,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:10:51,676 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2018-11-07 22:10:51,676 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 22:10:51,676 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2018-11-07 22:10:51,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-11-07 22:10:51,677 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:10:51,678 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:10:51,678 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:10:51,678 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:10:51,678 INFO L82 PathProgramCache]: Analyzing trace with hash 1585665648, now seen corresponding path program 3 times [2018-11-07 22:10:51,679 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:10:51,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:51,680 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:10:51,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:51,680 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:10:51,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:10:51,829 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 22:10:51,829 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:51,829 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:10:51,829 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:10:51,830 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:10:51,830 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:51,830 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:10:51,844 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:10:51,845 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:10:51,865 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:10:51,865 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:10:51,869 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:10:51,878 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 22:10:51,879 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:10:51,992 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 22:10:52,022 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:10:52,022 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 9 [2018-11-07 22:10:52,022 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:10:52,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 22:10:52,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 22:10:52,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2018-11-07 22:10:52,024 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 9 states. [2018-11-07 22:10:52,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:10:52,263 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2018-11-07 22:10:52,264 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-07 22:10:52,264 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 34 [2018-11-07 22:10:52,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:10:52,265 INFO L225 Difference]: With dead ends: 60 [2018-11-07 22:10:52,265 INFO L226 Difference]: Without dead ends: 39 [2018-11-07 22:10:52,266 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2018-11-07 22:10:52,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-11-07 22:10:52,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-11-07 22:10:52,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-11-07 22:10:52,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-11-07 22:10:52,273 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 34 [2018-11-07 22:10:52,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:10:52,274 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-11-07 22:10:52,274 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 22:10:52,274 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-11-07 22:10:52,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-11-07 22:10:52,275 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:10:52,275 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:10:52,276 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:10:52,276 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:10:52,276 INFO L82 PathProgramCache]: Analyzing trace with hash -75224214, now seen corresponding path program 4 times [2018-11-07 22:10:52,276 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:10:52,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:52,277 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:10:52,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:52,277 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:10:52,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:10:52,545 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 15 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-07 22:10:52,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:52,546 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:10:52,546 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:10:52,546 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:10:52,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:52,546 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:10:52,554 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:10:52,555 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:10:52,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:10:52,580 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:10:52,634 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 22:10:52,634 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:10:52,736 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 22:10:52,757 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:10:52,757 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 11 [2018-11-07 22:10:52,757 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:10:52,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-07 22:10:52,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-07 22:10:52,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2018-11-07 22:10:52,759 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 11 states. [2018-11-07 22:10:52,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:10:52,935 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-11-07 22:10:52,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 22:10:52,935 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 36 [2018-11-07 22:10:52,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:10:52,937 INFO L225 Difference]: With dead ends: 49 [2018-11-07 22:10:52,937 INFO L226 Difference]: Without dead ends: 47 [2018-11-07 22:10:52,937 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 7 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-11-07 22:10:52,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-11-07 22:10:52,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-11-07 22:10:52,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-11-07 22:10:52,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2018-11-07 22:10:52,945 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 36 [2018-11-07 22:10:52,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:10:52,946 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2018-11-07 22:10:52,946 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-07 22:10:52,946 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2018-11-07 22:10:52,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-11-07 22:10:52,947 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:10:52,948 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:10:52,948 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:10:52,948 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:10:52,948 INFO L82 PathProgramCache]: Analyzing trace with hash 959019949, now seen corresponding path program 5 times [2018-11-07 22:10:52,948 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:10:52,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:52,949 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:10:52,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:52,950 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:10:52,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:10:53,070 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 22:10:53,070 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:53,071 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:10:53,071 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:10:53,071 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:10:53,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:53,072 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:10:53,080 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:10:53,080 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:10:53,116 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-11-07 22:10:53,117 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:10:53,120 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:10:53,131 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 22:10:53,132 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:10:53,266 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 22:10:53,286 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:10:53,286 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 11 [2018-11-07 22:10:53,286 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:10:53,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-07 22:10:53,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-07 22:10:53,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2018-11-07 22:10:53,288 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 11 states. [2018-11-07 22:10:53,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:10:53,494 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2018-11-07 22:10:53,497 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 22:10:53,497 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 44 [2018-11-07 22:10:53,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:10:53,499 INFO L225 Difference]: With dead ends: 74 [2018-11-07 22:10:53,499 INFO L226 Difference]: Without dead ends: 49 [2018-11-07 22:10:53,500 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 81 SyntacticMatches, 8 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2018-11-07 22:10:53,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-11-07 22:10:53,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-11-07 22:10:53,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-11-07 22:10:53,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2018-11-07 22:10:53,508 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 44 [2018-11-07 22:10:53,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:10:53,509 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2018-11-07 22:10:53,509 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-07 22:10:53,509 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2018-11-07 22:10:53,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-11-07 22:10:53,512 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:10:53,512 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:10:53,513 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:10:53,513 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:10:53,513 INFO L82 PathProgramCache]: Analyzing trace with hash 1636294695, now seen corresponding path program 6 times [2018-11-07 22:10:53,513 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:10:53,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:53,514 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:10:53,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:53,514 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:10:53,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:10:53,679 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 25 proven. 28 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-07 22:10:53,679 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:53,680 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:10:53,680 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:10:53,680 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:10:53,680 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:53,680 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:10:53,689 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:10:53,689 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:10:53,724 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:10:53,724 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:10:53,727 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:10:53,812 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 22:10:53,813 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:10:53,894 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 22:10:53,913 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:10:53,913 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 12 [2018-11-07 22:10:53,913 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:10:53,914 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-07 22:10:53,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-07 22:10:53,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2018-11-07 22:10:53,915 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 12 states. [2018-11-07 22:10:54,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:10:54,172 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2018-11-07 22:10:54,173 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 22:10:54,173 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 46 [2018-11-07 22:10:54,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:10:54,174 INFO L225 Difference]: With dead ends: 59 [2018-11-07 22:10:54,174 INFO L226 Difference]: Without dead ends: 57 [2018-11-07 22:10:54,174 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 87 SyntacticMatches, 9 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2018-11-07 22:10:54,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-07 22:10:54,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-11-07 22:10:54,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-11-07 22:10:54,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-11-07 22:10:54,182 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 46 [2018-11-07 22:10:54,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:10:54,183 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-11-07 22:10:54,183 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-07 22:10:54,183 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-11-07 22:10:54,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-11-07 22:10:54,184 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:10:54,184 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:10:54,185 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:10:54,185 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:10:54,185 INFO L82 PathProgramCache]: Analyzing trace with hash -2134957206, now seen corresponding path program 7 times [2018-11-07 22:10:54,185 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:10:54,186 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:54,186 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:10:54,186 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:54,186 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:10:54,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:10:54,351 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 22:10:54,351 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:54,351 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:10:54,351 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:10:54,352 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:10:54,352 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:54,352 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:10:54,360 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:10:54,361 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:10:54,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:10:54,382 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:10:54,395 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 22:10:54,396 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:10:54,526 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 22:10:54,546 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:10:54,546 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 13 [2018-11-07 22:10:54,546 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:10:54,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 22:10:54,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 22:10:54,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2018-11-07 22:10:54,548 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 13 states. [2018-11-07 22:10:54,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:10:54,734 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2018-11-07 22:10:54,734 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 22:10:54,735 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 54 [2018-11-07 22:10:54,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:10:54,736 INFO L225 Difference]: With dead ends: 88 [2018-11-07 22:10:54,736 INFO L226 Difference]: Without dead ends: 59 [2018-11-07 22:10:54,737 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 99 SyntacticMatches, 10 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=97, Invalid=245, Unknown=0, NotChecked=0, Total=342 [2018-11-07 22:10:54,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-11-07 22:10:54,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-11-07 22:10:54,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-11-07 22:10:54,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2018-11-07 22:10:54,745 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 54 [2018-11-07 22:10:54,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:10:54,746 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2018-11-07 22:10:54,746 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 22:10:54,746 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2018-11-07 22:10:54,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-11-07 22:10:54,747 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:10:54,747 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:10:54,748 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:10:54,748 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:10:54,748 INFO L82 PathProgramCache]: Analyzing trace with hash -1771194524, now seen corresponding path program 8 times [2018-11-07 22:10:54,748 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:10:54,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:54,749 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:10:54,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:54,749 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:10:54,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:10:54,900 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 37 proven. 46 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 22:10:54,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:54,900 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:10:54,901 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:10:54,901 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:10:54,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:54,901 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:10:54,910 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:10:54,911 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:10:54,934 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 22:10:54,934 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:10:54,939 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:10:55,008 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 22:10:55,008 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:10:55,122 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 22:10:55,143 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:10:55,143 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 13 [2018-11-07 22:10:55,143 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:10:55,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 22:10:55,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 22:10:55,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-11-07 22:10:55,146 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand 13 states. [2018-11-07 22:10:55,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:10:55,335 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2018-11-07 22:10:55,335 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-07 22:10:55,336 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 56 [2018-11-07 22:10:55,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:10:55,337 INFO L225 Difference]: With dead ends: 69 [2018-11-07 22:10:55,338 INFO L226 Difference]: Without dead ends: 67 [2018-11-07 22:10:55,338 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 106 SyntacticMatches, 11 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2018-11-07 22:10:55,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-11-07 22:10:55,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-11-07 22:10:55,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-11-07 22:10:55,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2018-11-07 22:10:55,346 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 56 [2018-11-07 22:10:55,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:10:55,346 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2018-11-07 22:10:55,346 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 22:10:55,346 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2018-11-07 22:10:55,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-11-07 22:10:55,348 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:10:55,348 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:10:55,348 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:10:55,348 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:10:55,348 INFO L82 PathProgramCache]: Analyzing trace with hash -835949145, now seen corresponding path program 9 times [2018-11-07 22:10:55,349 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:10:55,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:55,349 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:10:55,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:55,350 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:10:55,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:10:56,115 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 22:10:56,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:56,116 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:10:56,116 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:10:56,116 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:10:56,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:56,117 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:10:56,129 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:10:56,129 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:10:56,173 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:10:56,173 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:10:56,176 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:10:56,193 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 22:10:56,193 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:10:56,889 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 22:10:56,908 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:10:56,909 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 15 [2018-11-07 22:10:56,909 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:10:56,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-07 22:10:56,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-07 22:10:56,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2018-11-07 22:10:56,910 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 15 states. [2018-11-07 22:10:57,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:10:57,207 INFO L93 Difference]: Finished difference Result 102 states and 109 transitions. [2018-11-07 22:10:57,207 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-07 22:10:57,207 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 64 [2018-11-07 22:10:57,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:10:57,208 INFO L225 Difference]: With dead ends: 102 [2018-11-07 22:10:57,208 INFO L226 Difference]: Without dead ends: 69 [2018-11-07 22:10:57,210 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 117 SyntacticMatches, 12 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=127, Invalid=335, Unknown=0, NotChecked=0, Total=462 [2018-11-07 22:10:57,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-11-07 22:10:57,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-11-07 22:10:57,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-11-07 22:10:57,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-11-07 22:10:57,219 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 64 [2018-11-07 22:10:57,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:10:57,219 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-11-07 22:10:57,219 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-07 22:10:57,219 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-11-07 22:10:57,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-11-07 22:10:57,221 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:10:57,221 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:10:57,221 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:10:57,221 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:10:57,222 INFO L82 PathProgramCache]: Analyzing trace with hash -598355679, now seen corresponding path program 10 times [2018-11-07 22:10:57,222 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:10:57,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:57,223 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:10:57,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:57,223 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:10:57,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:10:57,402 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 51 proven. 68 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-07 22:10:57,402 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:57,403 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:10:57,403 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:10:57,403 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:10:57,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:57,404 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:10:57,415 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:10:57,416 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:10:57,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:10:57,437 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:10:57,487 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 22:10:57,487 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:10:57,629 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 22:10:57,649 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:10:57,649 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 14 [2018-11-07 22:10:57,649 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:10:57,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 22:10:57,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 22:10:57,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2018-11-07 22:10:57,651 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 14 states. [2018-11-07 22:10:57,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:10:57,983 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-11-07 22:10:57,983 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 22:10:57,984 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 66 [2018-11-07 22:10:57,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:10:57,985 INFO L225 Difference]: With dead ends: 79 [2018-11-07 22:10:57,985 INFO L226 Difference]: Without dead ends: 77 [2018-11-07 22:10:57,986 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 125 SyntacticMatches, 13 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2018-11-07 22:10:57,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-11-07 22:10:57,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2018-11-07 22:10:57,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-11-07 22:10:57,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2018-11-07 22:10:57,993 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 66 [2018-11-07 22:10:57,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:10:57,993 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2018-11-07 22:10:57,993 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 22:10:57,993 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2018-11-07 22:10:57,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-11-07 22:10:57,994 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:10:57,995 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:10:57,995 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:10:57,995 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:10:57,995 INFO L82 PathProgramCache]: Analyzing trace with hash -781092252, now seen corresponding path program 11 times [2018-11-07 22:10:57,995 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:10:57,996 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:57,996 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:10:57,996 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:57,996 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:10:58,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:10:58,272 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 22:10:58,272 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:58,272 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:10:58,272 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:10:58,273 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:10:58,273 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:58,273 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:10:58,284 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:10:58,284 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:10:58,335 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-11-07 22:10:58,335 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:10:58,338 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:10:58,366 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 22:10:58,367 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:10:58,697 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 22:10:58,716 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:10:58,717 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 17 [2018-11-07 22:10:58,717 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:10:58,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-07 22:10:58,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-07 22:10:58,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2018-11-07 22:10:58,718 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand 17 states. [2018-11-07 22:10:59,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:10:59,151 INFO L93 Difference]: Finished difference Result 116 states and 124 transitions. [2018-11-07 22:10:59,151 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 22:10:59,151 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 74 [2018-11-07 22:10:59,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:10:59,152 INFO L225 Difference]: With dead ends: 116 [2018-11-07 22:10:59,152 INFO L226 Difference]: Without dead ends: 79 [2018-11-07 22:10:59,154 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 135 SyntacticMatches, 14 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=161, Invalid=439, Unknown=0, NotChecked=0, Total=600 [2018-11-07 22:10:59,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-11-07 22:10:59,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-11-07 22:10:59,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-11-07 22:10:59,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-11-07 22:10:59,162 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 74 [2018-11-07 22:10:59,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:10:59,162 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-11-07 22:10:59,162 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-07 22:10:59,162 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-11-07 22:10:59,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-11-07 22:10:59,163 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:10:59,163 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:10:59,164 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:10:59,164 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:10:59,164 INFO L82 PathProgramCache]: Analyzing trace with hash 1719160158, now seen corresponding path program 12 times [2018-11-07 22:10:59,164 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:10:59,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:59,165 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:10:59,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:59,165 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:10:59,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:10:59,330 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 67 proven. 94 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 22:10:59,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:59,331 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:10:59,331 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:10:59,331 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:10:59,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:10:59,331 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:10:59,339 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:10:59,339 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:10:59,374 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:10:59,374 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:10:59,379 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:10:59,443 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 22:10:59,443 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:10:59,653 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 22:10:59,673 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:10:59,673 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 15 [2018-11-07 22:10:59,673 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:10:59,673 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-07 22:10:59,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-07 22:10:59,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2018-11-07 22:10:59,674 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 15 states. [2018-11-07 22:10:59,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:10:59,838 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2018-11-07 22:10:59,838 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 22:10:59,838 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 76 [2018-11-07 22:10:59,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:10:59,840 INFO L225 Difference]: With dead ends: 89 [2018-11-07 22:10:59,840 INFO L226 Difference]: Without dead ends: 87 [2018-11-07 22:10:59,841 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 144 SyntacticMatches, 15 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2018-11-07 22:10:59,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-11-07 22:10:59,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-11-07 22:10:59,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-11-07 22:10:59,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-11-07 22:10:59,848 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 76 [2018-11-07 22:10:59,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:10:59,849 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-11-07 22:10:59,849 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-07 22:10:59,849 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-11-07 22:10:59,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-11-07 22:10:59,850 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:10:59,850 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:10:59,850 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:10:59,850 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:10:59,851 INFO L82 PathProgramCache]: Analyzing trace with hash -1817810527, now seen corresponding path program 13 times [2018-11-07 22:10:59,851 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:10:59,851 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:59,851 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:10:59,852 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:10:59,852 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:10:59,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:00,063 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 22:11:00,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:00,063 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:00,063 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:00,063 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:00,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:00,064 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:11:00,072 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:00,072 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:11:00,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:00,113 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:00,126 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 22:11:00,126 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:00,386 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 22:11:00,406 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:00,406 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 19 [2018-11-07 22:11:00,406 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:00,407 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 22:11:00,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 22:11:00,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2018-11-07 22:11:00,407 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 19 states. [2018-11-07 22:11:00,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:00,707 INFO L93 Difference]: Finished difference Result 130 states and 139 transitions. [2018-11-07 22:11:00,718 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 22:11:00,718 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 84 [2018-11-07 22:11:00,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:00,719 INFO L225 Difference]: With dead ends: 130 [2018-11-07 22:11:00,719 INFO L226 Difference]: Without dead ends: 89 [2018-11-07 22:11:00,720 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 153 SyntacticMatches, 16 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=199, Invalid=557, Unknown=0, NotChecked=0, Total=756 [2018-11-07 22:11:00,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-11-07 22:11:00,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2018-11-07 22:11:00,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-11-07 22:11:00,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 90 transitions. [2018-11-07 22:11:00,728 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 90 transitions. Word has length 84 [2018-11-07 22:11:00,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:00,728 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 90 transitions. [2018-11-07 22:11:00,728 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 22:11:00,728 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 90 transitions. [2018-11-07 22:11:00,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-11-07 22:11:00,729 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:00,729 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:00,729 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:00,730 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:00,730 INFO L82 PathProgramCache]: Analyzing trace with hash 455429147, now seen corresponding path program 14 times [2018-11-07 22:11:00,730 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:00,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:00,731 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:00,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:00,731 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:00,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:01,046 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 85 proven. 124 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-07 22:11:01,046 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:01,046 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:01,046 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:01,047 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:01,047 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:01,047 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:11:01,063 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:11:01,064 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:11:01,100 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 22:11:01,100 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:11:01,104 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:01,144 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 22:11:01,144 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:01,262 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 22:11:01,281 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:01,281 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 16 [2018-11-07 22:11:01,281 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:01,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 22:11:01,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 22:11:01,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2018-11-07 22:11:01,282 INFO L87 Difference]: Start difference. First operand 89 states and 90 transitions. Second operand 16 states. [2018-11-07 22:11:01,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:01,457 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2018-11-07 22:11:01,458 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-07 22:11:01,458 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 86 [2018-11-07 22:11:01,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:01,459 INFO L225 Difference]: With dead ends: 99 [2018-11-07 22:11:01,459 INFO L226 Difference]: Without dead ends: 97 [2018-11-07 22:11:01,460 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 163 SyntacticMatches, 17 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2018-11-07 22:11:01,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-11-07 22:11:01,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-11-07 22:11:01,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-11-07 22:11:01,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-11-07 22:11:01,466 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 86 [2018-11-07 22:11:01,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:01,466 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-11-07 22:11:01,466 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 22:11:01,467 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-11-07 22:11:01,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-11-07 22:11:01,467 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:01,468 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:01,468 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:01,468 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:01,468 INFO L82 PathProgramCache]: Analyzing trace with hash 955997022, now seen corresponding path program 15 times [2018-11-07 22:11:01,468 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:01,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:01,469 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:11:01,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:01,469 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:01,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:01,696 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 22:11:01,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:01,696 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:01,696 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:01,696 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:01,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:01,696 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:11:01,704 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:11:01,705 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:11:01,733 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:11:01,734 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:11:01,736 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:01,752 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 22:11:01,752 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:01,950 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 22:11:01,970 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:01,970 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 21 [2018-11-07 22:11:01,970 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:01,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-07 22:11:01,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-07 22:11:01,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2018-11-07 22:11:01,971 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 21 states. [2018-11-07 22:11:02,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:02,258 INFO L93 Difference]: Finished difference Result 144 states and 154 transitions. [2018-11-07 22:11:02,265 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-07 22:11:02,265 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 94 [2018-11-07 22:11:02,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:02,266 INFO L225 Difference]: With dead ends: 144 [2018-11-07 22:11:02,266 INFO L226 Difference]: Without dead ends: 99 [2018-11-07 22:11:02,267 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 171 SyntacticMatches, 18 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=241, Invalid=689, Unknown=0, NotChecked=0, Total=930 [2018-11-07 22:11:02,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-11-07 22:11:02,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2018-11-07 22:11:02,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-11-07 22:11:02,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2018-11-07 22:11:02,279 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 94 [2018-11-07 22:11:02,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:02,280 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2018-11-07 22:11:02,280 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-07 22:11:02,280 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2018-11-07 22:11:02,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-11-07 22:11:02,280 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:02,281 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:02,281 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:02,281 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:02,281 INFO L82 PathProgramCache]: Analyzing trace with hash -708514472, now seen corresponding path program 16 times [2018-11-07 22:11:02,281 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:02,282 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:02,282 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:11:02,282 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:02,282 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:02,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:02,507 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 105 proven. 158 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-07 22:11:02,507 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:02,507 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:02,507 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:02,507 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:02,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:02,508 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:11:02,530 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:02,530 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:11:02,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:02,557 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:02,612 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 22:11:02,612 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:02,778 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 22:11:02,798 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:02,798 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 17 [2018-11-07 22:11:02,798 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:02,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-07 22:11:02,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-07 22:11:02,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=194, Unknown=0, NotChecked=0, Total=272 [2018-11-07 22:11:02,799 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand 17 states. [2018-11-07 22:11:03,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:03,026 INFO L93 Difference]: Finished difference Result 109 states and 110 transitions. [2018-11-07 22:11:03,027 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 22:11:03,027 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 96 [2018-11-07 22:11:03,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:03,029 INFO L225 Difference]: With dead ends: 109 [2018-11-07 22:11:03,029 INFO L226 Difference]: Without dead ends: 107 [2018-11-07 22:11:03,030 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 182 SyntacticMatches, 19 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2018-11-07 22:11:03,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2018-11-07 22:11:03,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2018-11-07 22:11:03,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-11-07 22:11:03,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 108 transitions. [2018-11-07 22:11:03,036 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 108 transitions. Word has length 96 [2018-11-07 22:11:03,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:03,036 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 108 transitions. [2018-11-07 22:11:03,037 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-07 22:11:03,037 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 108 transitions. [2018-11-07 22:11:03,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-11-07 22:11:03,037 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:03,038 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:03,038 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:03,038 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:03,038 INFO L82 PathProgramCache]: Analyzing trace with hash 1119383451, now seen corresponding path program 17 times [2018-11-07 22:11:03,038 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:03,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:03,039 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:03,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:03,039 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:03,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:03,827 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 22:11:03,827 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:03,827 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:03,827 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:03,828 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:03,828 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:03,828 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:11:03,836 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:11:03,836 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:11:03,869 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-11-07 22:11:03,869 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:11:03,873 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:03,890 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 22:11:03,891 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:04,134 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 22:11:04,154 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:04,154 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 23 [2018-11-07 22:11:04,154 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:04,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-07 22:11:04,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-07 22:11:04,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=373, Unknown=0, NotChecked=0, Total=506 [2018-11-07 22:11:04,155 INFO L87 Difference]: Start difference. First operand 107 states and 108 transitions. Second operand 23 states. [2018-11-07 22:11:04,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:04,617 INFO L93 Difference]: Finished difference Result 158 states and 169 transitions. [2018-11-07 22:11:04,617 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-07 22:11:04,618 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 104 [2018-11-07 22:11:04,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:04,619 INFO L225 Difference]: With dead ends: 158 [2018-11-07 22:11:04,619 INFO L226 Difference]: Without dead ends: 109 [2018-11-07 22:11:04,620 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 189 SyntacticMatches, 20 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=287, Invalid=835, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 22:11:04,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-11-07 22:11:04,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2018-11-07 22:11:04,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2018-11-07 22:11:04,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 110 transitions. [2018-11-07 22:11:04,627 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 110 transitions. Word has length 104 [2018-11-07 22:11:04,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:04,627 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 110 transitions. [2018-11-07 22:11:04,627 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-07 22:11:04,627 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 110 transitions. [2018-11-07 22:11:04,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2018-11-07 22:11:04,628 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:04,628 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:04,628 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:04,628 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:04,629 INFO L82 PathProgramCache]: Analyzing trace with hash 685199637, now seen corresponding path program 18 times [2018-11-07 22:11:04,629 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:04,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:04,629 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:11:04,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:04,630 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:04,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:04,911 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 127 proven. 196 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-07 22:11:04,912 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:04,912 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:04,912 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:04,912 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:04,912 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:04,912 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:11:04,922 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:11:04,922 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:11:04,954 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:11:04,954 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:11:04,956 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:05,008 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 22:11:05,008 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:05,298 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 22:11:05,327 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:05,327 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 18 [2018-11-07 22:11:05,327 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:05,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-07 22:11:05,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-07 22:11:05,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2018-11-07 22:11:05,329 INFO L87 Difference]: Start difference. First operand 109 states and 110 transitions. Second operand 18 states. [2018-11-07 22:11:05,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:05,538 INFO L93 Difference]: Finished difference Result 119 states and 120 transitions. [2018-11-07 22:11:05,538 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 22:11:05,538 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 106 [2018-11-07 22:11:05,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:05,540 INFO L225 Difference]: With dead ends: 119 [2018-11-07 22:11:05,540 INFO L226 Difference]: Without dead ends: 117 [2018-11-07 22:11:05,541 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 201 SyntacticMatches, 21 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2018-11-07 22:11:05,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-11-07 22:11:05,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2018-11-07 22:11:05,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-11-07 22:11:05,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 118 transitions. [2018-11-07 22:11:05,548 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 118 transitions. Word has length 106 [2018-11-07 22:11:05,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:05,548 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 118 transitions. [2018-11-07 22:11:05,548 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-07 22:11:05,548 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 118 transitions. [2018-11-07 22:11:05,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-11-07 22:11:05,549 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:05,549 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:05,550 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:05,550 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:05,550 INFO L82 PathProgramCache]: Analyzing trace with hash 1363002968, now seen corresponding path program 19 times [2018-11-07 22:11:05,550 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:05,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:05,551 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:11:05,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:05,551 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:05,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:05,818 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 22:11:05,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:05,818 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:05,818 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:05,818 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:05,819 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:05,819 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:11:05,830 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:05,830 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:11:05,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:05,862 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:05,880 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 22:11:05,880 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:06,091 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 22:11:06,111 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:06,112 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 25 [2018-11-07 22:11:06,112 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:06,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-07 22:11:06,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-07 22:11:06,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=443, Unknown=0, NotChecked=0, Total=600 [2018-11-07 22:11:06,113 INFO L87 Difference]: Start difference. First operand 117 states and 118 transitions. Second operand 25 states. [2018-11-07 22:11:07,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:07,011 INFO L93 Difference]: Finished difference Result 172 states and 184 transitions. [2018-11-07 22:11:07,015 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-07 22:11:07,015 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 114 [2018-11-07 22:11:07,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:07,016 INFO L225 Difference]: With dead ends: 172 [2018-11-07 22:11:07,017 INFO L226 Difference]: Without dead ends: 119 [2018-11-07 22:11:07,017 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 207 SyntacticMatches, 22 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=337, Invalid=995, Unknown=0, NotChecked=0, Total=1332 [2018-11-07 22:11:07,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2018-11-07 22:11:07,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2018-11-07 22:11:07,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-11-07 22:11:07,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 120 transitions. [2018-11-07 22:11:07,027 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 120 transitions. Word has length 114 [2018-11-07 22:11:07,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:07,028 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 120 transitions. [2018-11-07 22:11:07,028 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-07 22:11:07,028 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 120 transitions. [2018-11-07 22:11:07,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-11-07 22:11:07,029 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:07,029 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:07,029 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:07,030 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:07,030 INFO L82 PathProgramCache]: Analyzing trace with hash -1611360430, now seen corresponding path program 20 times [2018-11-07 22:11:07,030 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:07,030 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:07,031 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:07,031 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:07,031 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:07,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:07,572 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 151 proven. 238 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-11-07 22:11:07,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:07,573 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:07,573 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:07,573 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:07,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:07,573 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:11:07,582 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:11:07,582 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:11:07,626 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-07 22:11:07,627 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:11:07,631 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:07,691 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 22:11:07,691 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:07,926 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 22:11:07,945 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:07,946 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 19 [2018-11-07 22:11:07,946 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:07,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 22:11:07,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 22:11:07,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=239, Unknown=0, NotChecked=0, Total=342 [2018-11-07 22:11:07,947 INFO L87 Difference]: Start difference. First operand 119 states and 120 transitions. Second operand 19 states. [2018-11-07 22:11:08,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:08,143 INFO L93 Difference]: Finished difference Result 129 states and 130 transitions. [2018-11-07 22:11:08,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-07 22:11:08,143 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 116 [2018-11-07 22:11:08,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:08,145 INFO L225 Difference]: With dead ends: 129 [2018-11-07 22:11:08,145 INFO L226 Difference]: Without dead ends: 127 [2018-11-07 22:11:08,146 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 220 SyntacticMatches, 23 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=116, Invalid=304, Unknown=0, NotChecked=0, Total=420 [2018-11-07 22:11:08,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-11-07 22:11:08,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2018-11-07 22:11:08,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-11-07 22:11:08,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2018-11-07 22:11:08,153 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 116 [2018-11-07 22:11:08,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:08,154 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2018-11-07 22:11:08,154 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 22:11:08,154 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2018-11-07 22:11:08,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2018-11-07 22:11:08,155 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:08,155 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:08,156 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:08,156 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:08,156 INFO L82 PathProgramCache]: Analyzing trace with hash 1711505301, now seen corresponding path program 21 times [2018-11-07 22:11:08,156 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:08,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:08,157 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:11:08,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:08,157 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:08,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:08,614 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 22:11:08,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:08,615 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:08,615 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:08,615 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:08,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:08,615 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:11:08,631 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:11:08,631 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:11:08,685 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:11:08,685 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:11:08,689 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:08,713 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 22:11:08,714 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:09,232 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 22:11:09,251 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:09,252 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 27 [2018-11-07 22:11:09,252 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:09,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-11-07 22:11:09,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-11-07 22:11:09,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=519, Unknown=0, NotChecked=0, Total=702 [2018-11-07 22:11:09,253 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand 27 states. [2018-11-07 22:11:09,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:09,765 INFO L93 Difference]: Finished difference Result 186 states and 199 transitions. [2018-11-07 22:11:09,766 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-11-07 22:11:09,767 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 124 [2018-11-07 22:11:09,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:09,768 INFO L225 Difference]: With dead ends: 186 [2018-11-07 22:11:09,768 INFO L226 Difference]: Without dead ends: 129 [2018-11-07 22:11:09,769 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 225 SyntacticMatches, 24 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 473 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=391, Invalid=1169, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 22:11:09,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-11-07 22:11:09,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2018-11-07 22:11:09,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-11-07 22:11:09,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 130 transitions. [2018-11-07 22:11:09,776 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 130 transitions. Word has length 124 [2018-11-07 22:11:09,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:09,777 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 130 transitions. [2018-11-07 22:11:09,777 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-11-07 22:11:09,777 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 130 transitions. [2018-11-07 22:11:09,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2018-11-07 22:11:09,778 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:09,778 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:09,778 INFO L423 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:09,778 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:09,778 INFO L82 PathProgramCache]: Analyzing trace with hash -2117279729, now seen corresponding path program 22 times [2018-11-07 22:11:09,779 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:09,779 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:09,779 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:11:09,779 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:09,779 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:09,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:10,003 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 177 proven. 284 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-11-07 22:11:10,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:10,004 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:10,004 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:10,004 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:10,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:10,004 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:11:10,013 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:10,013 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:11:10,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:10,052 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:10,396 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 178 proven. 253 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 22:11:10,396 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:10,583 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 178 proven. 253 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 22:11:10,602 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:10,602 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 20 [2018-11-07 22:11:10,602 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:10,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-07 22:11:10,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-07 22:11:10,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=263, Unknown=0, NotChecked=0, Total=380 [2018-11-07 22:11:10,603 INFO L87 Difference]: Start difference. First operand 129 states and 130 transitions. Second operand 20 states. [2018-11-07 22:11:10,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:10,822 INFO L93 Difference]: Finished difference Result 139 states and 140 transitions. [2018-11-07 22:11:10,822 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 22:11:10,822 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 126 [2018-11-07 22:11:10,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:10,824 INFO L225 Difference]: With dead ends: 139 [2018-11-07 22:11:10,824 INFO L226 Difference]: Without dead ends: 137 [2018-11-07 22:11:10,825 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 239 SyntacticMatches, 25 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=130, Invalid=332, Unknown=0, NotChecked=0, Total=462 [2018-11-07 22:11:10,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2018-11-07 22:11:10,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2018-11-07 22:11:10,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2018-11-07 22:11:10,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 138 transitions. [2018-11-07 22:11:10,832 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 138 transitions. Word has length 126 [2018-11-07 22:11:10,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:10,833 INFO L480 AbstractCegarLoop]: Abstraction has 137 states and 138 transitions. [2018-11-07 22:11:10,833 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-07 22:11:10,833 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 138 transitions. [2018-11-07 22:11:10,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-11-07 22:11:10,834 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:10,834 INFO L375 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:10,834 INFO L423 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:10,834 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:10,834 INFO L82 PathProgramCache]: Analyzing trace with hash -1516651694, now seen corresponding path program 23 times [2018-11-07 22:11:10,835 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:10,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:10,835 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:10,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:10,835 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:10,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:11,135 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-11-07 22:11:11,136 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:11,136 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:11,136 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:11,136 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:11,136 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:11,136 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 22:11:11,144 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:11:11,144 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:11:11,188 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-11-07 22:11:11,189 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:11:11,192 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:11,213 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-11-07 22:11:11,213 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:12,351 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-11-07 22:11:12,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:12,371 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 29 [2018-11-07 22:11:12,371 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:12,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-11-07 22:11:12,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-11-07 22:11:12,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=601, Unknown=0, NotChecked=0, Total=812 [2018-11-07 22:11:12,373 INFO L87 Difference]: Start difference. First operand 137 states and 138 transitions. Second operand 29 states. [2018-11-07 22:11:12,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:12,940 INFO L93 Difference]: Finished difference Result 200 states and 214 transitions. [2018-11-07 22:11:12,948 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-07 22:11:12,948 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 134 [2018-11-07 22:11:12,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:12,949 INFO L225 Difference]: With dead ends: 200 [2018-11-07 22:11:12,949 INFO L226 Difference]: Without dead ends: 139 [2018-11-07 22:11:12,950 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 243 SyntacticMatches, 26 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 558 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=449, Invalid=1357, Unknown=0, NotChecked=0, Total=1806 [2018-11-07 22:11:12,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-11-07 22:11:12,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2018-11-07 22:11:12,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-11-07 22:11:12,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2018-11-07 22:11:12,959 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 134 [2018-11-07 22:11:12,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:12,959 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2018-11-07 22:11:12,959 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-11-07 22:11:12,960 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2018-11-07 22:11:12,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2018-11-07 22:11:12,960 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:12,960 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:12,961 INFO L423 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:12,961 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:12,961 INFO L82 PathProgramCache]: Analyzing trace with hash 304630604, now seen corresponding path program 24 times [2018-11-07 22:11:12,961 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:12,962 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:12,962 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:11:12,962 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:12,962 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:12,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:13,436 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 205 proven. 334 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-11-07 22:11:13,436 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:13,436 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:13,436 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:13,437 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:13,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:13,437 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 22:11:13,446 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:11:13,447 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:11:13,486 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:11:13,486 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:11:13,489 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:13,542 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 206 proven. 300 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-11-07 22:11:13,542 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:14,069 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 206 proven. 300 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-11-07 22:11:14,089 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:14,089 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 21 [2018-11-07 22:11:14,089 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:14,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-07 22:11:14,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-07 22:11:14,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=288, Unknown=0, NotChecked=0, Total=420 [2018-11-07 22:11:14,090 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand 21 states. [2018-11-07 22:11:14,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:14,304 INFO L93 Difference]: Finished difference Result 149 states and 150 transitions. [2018-11-07 22:11:14,304 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-07 22:11:14,305 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 136 [2018-11-07 22:11:14,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:14,306 INFO L225 Difference]: With dead ends: 149 [2018-11-07 22:11:14,307 INFO L226 Difference]: Without dead ends: 147 [2018-11-07 22:11:14,308 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 258 SyntacticMatches, 27 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=145, Invalid=361, Unknown=0, NotChecked=0, Total=506 [2018-11-07 22:11:14,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-11-07 22:11:14,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2018-11-07 22:11:14,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-11-07 22:11:14,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 148 transitions. [2018-11-07 22:11:14,315 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 148 transitions. Word has length 136 [2018-11-07 22:11:14,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:14,315 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 148 transitions. [2018-11-07 22:11:14,316 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-07 22:11:14,316 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 148 transitions. [2018-11-07 22:11:14,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2018-11-07 22:11:14,317 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:14,317 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:14,317 INFO L423 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:14,317 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:14,317 INFO L82 PathProgramCache]: Analyzing trace with hash -1717003889, now seen corresponding path program 25 times [2018-11-07 22:11:14,317 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:14,318 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:14,318 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:11:14,318 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:14,318 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:14,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:15,314 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-11-07 22:11:15,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:15,315 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:15,315 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:15,315 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:15,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:15,315 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 22:11:15,323 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:15,323 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:11:15,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:15,367 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:15,390 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-11-07 22:11:15,391 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:15,711 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-11-07 22:11:15,731 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:15,731 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 31 [2018-11-07 22:11:15,731 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:15,732 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-11-07 22:11:15,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-11-07 22:11:15,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=689, Unknown=0, NotChecked=0, Total=930 [2018-11-07 22:11:15,733 INFO L87 Difference]: Start difference. First operand 147 states and 148 transitions. Second operand 31 states. [2018-11-07 22:11:17,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:17,338 INFO L93 Difference]: Finished difference Result 214 states and 229 transitions. [2018-11-07 22:11:17,339 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-11-07 22:11:17,339 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 144 [2018-11-07 22:11:17,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:17,340 INFO L225 Difference]: With dead ends: 214 [2018-11-07 22:11:17,340 INFO L226 Difference]: Without dead ends: 149 [2018-11-07 22:11:17,341 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 261 SyntacticMatches, 28 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 650 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=511, Invalid=1559, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 22:11:17,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-11-07 22:11:17,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2018-11-07 22:11:17,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-11-07 22:11:17,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 150 transitions. [2018-11-07 22:11:17,349 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 150 transitions. Word has length 144 [2018-11-07 22:11:17,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:17,350 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 150 transitions. [2018-11-07 22:11:17,350 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-11-07 22:11:17,350 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 150 transitions. [2018-11-07 22:11:17,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-11-07 22:11:17,351 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:17,351 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:17,351 INFO L423 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:17,351 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:17,351 INFO L82 PathProgramCache]: Analyzing trace with hash 1407645961, now seen corresponding path program 26 times [2018-11-07 22:11:17,352 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:17,352 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:17,352 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:17,352 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:17,353 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:17,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:17,839 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 235 proven. 388 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-11-07 22:11:17,840 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:17,840 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:17,840 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:17,840 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:17,840 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:17,840 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 22:11:17,849 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:11:17,849 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:11:17,935 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-07 22:11:17,935 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:11:17,939 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:17,995 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 236 proven. 351 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-11-07 22:11:17,995 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:18,227 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 236 proven. 351 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-11-07 22:11:18,247 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:18,247 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 22 [2018-11-07 22:11:18,247 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:18,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-07 22:11:18,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-07 22:11:18,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=314, Unknown=0, NotChecked=0, Total=462 [2018-11-07 22:11:18,248 INFO L87 Difference]: Start difference. First operand 149 states and 150 transitions. Second operand 22 states. [2018-11-07 22:11:18,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:18,480 INFO L93 Difference]: Finished difference Result 159 states and 160 transitions. [2018-11-07 22:11:18,481 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-07 22:11:18,481 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 146 [2018-11-07 22:11:18,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:18,483 INFO L225 Difference]: With dead ends: 159 [2018-11-07 22:11:18,483 INFO L226 Difference]: Without dead ends: 157 [2018-11-07 22:11:18,484 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 277 SyntacticMatches, 29 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=161, Invalid=391, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:11:18,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-11-07 22:11:18,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2018-11-07 22:11:18,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-11-07 22:11:18,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 158 transitions. [2018-11-07 22:11:18,490 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 158 transitions. Word has length 146 [2018-11-07 22:11:18,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:18,490 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 158 transitions. [2018-11-07 22:11:18,491 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-07 22:11:18,491 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 158 transitions. [2018-11-07 22:11:18,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2018-11-07 22:11:18,492 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:18,492 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:18,492 INFO L423 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:18,492 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:18,492 INFO L82 PathProgramCache]: Analyzing trace with hash -219137460, now seen corresponding path program 27 times [2018-11-07 22:11:18,492 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:18,493 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:18,493 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:11:18,493 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:18,493 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:18,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:20,003 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-11-07 22:11:20,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:20,004 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:20,004 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:20,004 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:20,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:20,004 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 22:11:20,016 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:11:20,016 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:11:20,059 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:11:20,059 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:11:20,063 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:20,092 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-11-07 22:11:20,093 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:20,835 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-11-07 22:11:20,854 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:20,855 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 33 [2018-11-07 22:11:20,855 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:20,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-11-07 22:11:20,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-11-07 22:11:20,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=783, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 22:11:20,856 INFO L87 Difference]: Start difference. First operand 157 states and 158 transitions. Second operand 33 states. [2018-11-07 22:11:21,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:21,682 INFO L93 Difference]: Finished difference Result 228 states and 244 transitions. [2018-11-07 22:11:21,682 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-11-07 22:11:21,682 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 154 [2018-11-07 22:11:21,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:21,683 INFO L225 Difference]: With dead ends: 228 [2018-11-07 22:11:21,683 INFO L226 Difference]: Without dead ends: 159 [2018-11-07 22:11:21,685 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 279 SyntacticMatches, 30 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 749 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=577, Invalid=1775, Unknown=0, NotChecked=0, Total=2352 [2018-11-07 22:11:21,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2018-11-07 22:11:21,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2018-11-07 22:11:21,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-11-07 22:11:21,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 160 transitions. [2018-11-07 22:11:21,695 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 160 transitions. Word has length 154 [2018-11-07 22:11:21,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:21,695 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 160 transitions. [2018-11-07 22:11:21,695 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-11-07 22:11:21,695 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 160 transitions. [2018-11-07 22:11:21,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-11-07 22:11:21,696 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:21,696 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:21,696 INFO L423 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:21,697 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:21,697 INFO L82 PathProgramCache]: Analyzing trace with hash 1258359110, now seen corresponding path program 28 times [2018-11-07 22:11:21,697 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:21,697 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:21,697 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:11:21,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:21,698 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:21,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:22,000 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 267 proven. 446 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-11-07 22:11:22,000 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:22,000 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:22,000 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:22,001 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:22,001 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:22,001 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 22:11:22,010 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:22,010 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:11:22,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:22,062 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:22,154 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 268 proven. 406 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-11-07 22:11:22,155 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:22,407 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 268 proven. 406 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-11-07 22:11:22,427 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:22,427 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 23 [2018-11-07 22:11:22,427 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:22,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-07 22:11:22,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-07 22:11:22,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=341, Unknown=0, NotChecked=0, Total=506 [2018-11-07 22:11:22,428 INFO L87 Difference]: Start difference. First operand 159 states and 160 transitions. Second operand 23 states. [2018-11-07 22:11:23,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:23,066 INFO L93 Difference]: Finished difference Result 169 states and 170 transitions. [2018-11-07 22:11:23,066 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-07 22:11:23,066 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 156 [2018-11-07 22:11:23,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:23,068 INFO L225 Difference]: With dead ends: 169 [2018-11-07 22:11:23,068 INFO L226 Difference]: Without dead ends: 167 [2018-11-07 22:11:23,069 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 296 SyntacticMatches, 31 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=178, Invalid=422, Unknown=0, NotChecked=0, Total=600 [2018-11-07 22:11:23,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2018-11-07 22:11:23,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 167. [2018-11-07 22:11:23,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-11-07 22:11:23,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 168 transitions. [2018-11-07 22:11:23,077 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 168 transitions. Word has length 156 [2018-11-07 22:11:23,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:23,077 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 168 transitions. [2018-11-07 22:11:23,077 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-07 22:11:23,077 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 168 transitions. [2018-11-07 22:11:23,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-11-07 22:11:23,078 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:23,078 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:23,079 INFO L423 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:23,079 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:23,079 INFO L82 PathProgramCache]: Analyzing trace with hash -884425335, now seen corresponding path program 29 times [2018-11-07 22:11:23,079 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:23,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:23,080 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:23,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:23,080 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:23,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:23,664 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-11-07 22:11:23,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:23,664 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:23,664 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:23,664 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:23,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:23,664 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 22:11:23,673 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:11:23,674 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:11:23,910 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-11-07 22:11:23,910 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:11:23,914 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:23,947 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-11-07 22:11:23,947 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:24,382 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-11-07 22:11:24,402 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:24,403 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 35 [2018-11-07 22:11:24,403 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:24,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-11-07 22:11:24,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-11-07 22:11:24,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=883, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 22:11:24,404 INFO L87 Difference]: Start difference. First operand 167 states and 168 transitions. Second operand 35 states. [2018-11-07 22:11:25,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:25,278 INFO L93 Difference]: Finished difference Result 242 states and 259 transitions. [2018-11-07 22:11:25,284 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-11-07 22:11:25,284 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 164 [2018-11-07 22:11:25,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:25,285 INFO L225 Difference]: With dead ends: 242 [2018-11-07 22:11:25,285 INFO L226 Difference]: Without dead ends: 169 [2018-11-07 22:11:25,287 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 379 GetRequests, 297 SyntacticMatches, 32 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 855 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=647, Invalid=2005, Unknown=0, NotChecked=0, Total=2652 [2018-11-07 22:11:25,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-11-07 22:11:25,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-11-07 22:11:25,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-11-07 22:11:25,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2018-11-07 22:11:25,296 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 164 [2018-11-07 22:11:25,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:25,296 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2018-11-07 22:11:25,296 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-11-07 22:11:25,296 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2018-11-07 22:11:25,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2018-11-07 22:11:25,298 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:25,298 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:25,298 INFO L423 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:25,298 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:25,298 INFO L82 PathProgramCache]: Analyzing trace with hash -1098474493, now seen corresponding path program 30 times [2018-11-07 22:11:25,298 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:25,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:25,299 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:11:25,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:25,299 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:25,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:25,564 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 301 proven. 508 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-11-07 22:11:25,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:25,564 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:25,565 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:25,565 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:25,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:25,565 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 22:11:25,579 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:11:25,580 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:11:25,629 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:11:25,629 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:11:25,633 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:26,281 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 302 proven. 465 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-11-07 22:11:26,282 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:26,992 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 302 proven. 465 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-11-07 22:11:27,011 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:27,011 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 24 [2018-11-07 22:11:27,011 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:27,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-07 22:11:27,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-07 22:11:27,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=369, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:11:27,012 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand 24 states. [2018-11-07 22:11:27,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:27,474 INFO L93 Difference]: Finished difference Result 179 states and 180 transitions. [2018-11-07 22:11:27,474 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-07 22:11:27,474 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 166 [2018-11-07 22:11:27,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:27,476 INFO L225 Difference]: With dead ends: 179 [2018-11-07 22:11:27,477 INFO L226 Difference]: Without dead ends: 177 [2018-11-07 22:11:27,477 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 315 SyntacticMatches, 33 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 388 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=196, Invalid=454, Unknown=0, NotChecked=0, Total=650 [2018-11-07 22:11:27,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-11-07 22:11:27,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 177. [2018-11-07 22:11:27,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-11-07 22:11:27,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 178 transitions. [2018-11-07 22:11:27,486 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 178 transitions. Word has length 166 [2018-11-07 22:11:27,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:27,487 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 178 transitions. [2018-11-07 22:11:27,487 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-07 22:11:27,487 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 178 transitions. [2018-11-07 22:11:27,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-11-07 22:11:27,488 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:27,488 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:27,489 INFO L423 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:27,489 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:27,489 INFO L82 PathProgramCache]: Analyzing trace with hash 1738687302, now seen corresponding path program 31 times [2018-11-07 22:11:27,489 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:27,490 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:27,490 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:11:27,490 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:27,490 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:27,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:28,245 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-11-07 22:11:28,245 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:28,245 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:28,245 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:28,245 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:28,245 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:28,246 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 22:11:28,253 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:28,253 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:11:28,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:28,312 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:28,346 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-11-07 22:11:28,346 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:28,797 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-11-07 22:11:28,817 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:28,817 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 37 [2018-11-07 22:11:28,817 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:28,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-11-07 22:11:28,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-11-07 22:11:28,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=343, Invalid=989, Unknown=0, NotChecked=0, Total=1332 [2018-11-07 22:11:28,819 INFO L87 Difference]: Start difference. First operand 177 states and 178 transitions. Second operand 37 states. [2018-11-07 22:11:29,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:29,717 INFO L93 Difference]: Finished difference Result 256 states and 274 transitions. [2018-11-07 22:11:29,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-11-07 22:11:29,717 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 174 [2018-11-07 22:11:29,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:29,718 INFO L225 Difference]: With dead ends: 256 [2018-11-07 22:11:29,718 INFO L226 Difference]: Without dead ends: 179 [2018-11-07 22:11:29,721 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 315 SyntacticMatches, 34 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 968 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=721, Invalid=2249, Unknown=0, NotChecked=0, Total=2970 [2018-11-07 22:11:29,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2018-11-07 22:11:29,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2018-11-07 22:11:29,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2018-11-07 22:11:29,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 180 transitions. [2018-11-07 22:11:29,730 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 180 transitions. Word has length 174 [2018-11-07 22:11:29,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:29,730 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 180 transitions. [2018-11-07 22:11:29,731 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-11-07 22:11:29,731 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 180 transitions. [2018-11-07 22:11:29,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-11-07 22:11:29,732 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:29,732 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:29,732 INFO L423 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:29,732 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:29,732 INFO L82 PathProgramCache]: Analyzing trace with hash 2057294144, now seen corresponding path program 32 times [2018-11-07 22:11:29,732 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:29,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:29,733 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:29,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:29,733 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:29,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:30,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 337 proven. 574 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-11-07 22:11:30,137 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:30,137 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:30,137 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:30,137 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:30,137 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:30,137 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 22:11:30,146 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:11:30,146 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:11:30,210 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-11-07 22:11:30,210 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:11:30,214 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:30,319 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 338 proven. 528 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-11-07 22:11:30,319 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:30,680 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 338 proven. 528 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-11-07 22:11:30,699 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:30,700 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 25 [2018-11-07 22:11:30,700 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:30,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-07 22:11:30,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-07 22:11:30,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=398, Unknown=0, NotChecked=0, Total=600 [2018-11-07 22:11:30,701 INFO L87 Difference]: Start difference. First operand 179 states and 180 transitions. Second operand 25 states. [2018-11-07 22:11:31,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:31,458 INFO L93 Difference]: Finished difference Result 189 states and 190 transitions. [2018-11-07 22:11:31,459 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-07 22:11:31,459 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 176 [2018-11-07 22:11:31,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:31,460 INFO L225 Difference]: With dead ends: 189 [2018-11-07 22:11:31,461 INFO L226 Difference]: Without dead ends: 187 [2018-11-07 22:11:31,461 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 334 SyntacticMatches, 35 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 429 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=215, Invalid=487, Unknown=0, NotChecked=0, Total=702 [2018-11-07 22:11:31,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-11-07 22:11:31,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2018-11-07 22:11:31,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-11-07 22:11:31,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 188 transitions. [2018-11-07 22:11:31,471 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 188 transitions. Word has length 176 [2018-11-07 22:11:31,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:31,471 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 188 transitions. [2018-11-07 22:11:31,471 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-07 22:11:31,471 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 188 transitions. [2018-11-07 22:11:31,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2018-11-07 22:11:31,472 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:31,473 INFO L375 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:31,473 INFO L423 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:31,473 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:31,473 INFO L82 PathProgramCache]: Analyzing trace with hash 2047142787, now seen corresponding path program 33 times [2018-11-07 22:11:31,473 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:31,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:31,474 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:11:31,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:31,474 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:31,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:32,013 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-11-07 22:11:32,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:32,014 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:32,014 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:32,014 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:32,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:32,014 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 22:11:32,023 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:11:32,023 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:11:32,082 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:11:32,082 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:11:32,088 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:32,147 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-11-07 22:11:32,147 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:32,944 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-11-07 22:11:32,963 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:32,963 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 39 [2018-11-07 22:11:32,963 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:32,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-11-07 22:11:32,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-11-07 22:11:32,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=381, Invalid=1101, Unknown=0, NotChecked=0, Total=1482 [2018-11-07 22:11:32,964 INFO L87 Difference]: Start difference. First operand 187 states and 188 transitions. Second operand 39 states. [2018-11-07 22:11:34,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:34,042 INFO L93 Difference]: Finished difference Result 270 states and 289 transitions. [2018-11-07 22:11:34,043 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-11-07 22:11:34,043 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 184 [2018-11-07 22:11:34,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:34,044 INFO L225 Difference]: With dead ends: 270 [2018-11-07 22:11:34,044 INFO L226 Difference]: Without dead ends: 189 [2018-11-07 22:11:34,045 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 333 SyntacticMatches, 36 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1088 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=799, Invalid=2507, Unknown=0, NotChecked=0, Total=3306 [2018-11-07 22:11:34,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2018-11-07 22:11:34,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 189. [2018-11-07 22:11:34,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-11-07 22:11:34,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 190 transitions. [2018-11-07 22:11:34,056 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 190 transitions. Word has length 184 [2018-11-07 22:11:34,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:34,056 INFO L480 AbstractCegarLoop]: Abstraction has 189 states and 190 transitions. [2018-11-07 22:11:34,056 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-11-07 22:11:34,056 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 190 transitions. [2018-11-07 22:11:34,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-11-07 22:11:34,058 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:34,059 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:34,059 INFO L423 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:34,059 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:34,059 INFO L82 PathProgramCache]: Analyzing trace with hash 311216381, now seen corresponding path program 34 times [2018-11-07 22:11:34,059 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:34,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:34,060 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:11:34,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:34,060 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:34,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:34,943 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 375 proven. 644 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-11-07 22:11:34,943 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:34,943 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:34,943 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:34,943 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:34,943 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:34,944 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 22:11:34,951 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:34,951 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:11:35,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:35,007 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:35,219 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 376 proven. 595 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-11-07 22:11:35,219 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:35,535 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 376 proven. 595 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-11-07 22:11:35,554 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:35,554 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 26 [2018-11-07 22:11:35,554 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:35,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-07 22:11:35,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-07 22:11:35,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=428, Unknown=0, NotChecked=0, Total=650 [2018-11-07 22:11:35,555 INFO L87 Difference]: Start difference. First operand 189 states and 190 transitions. Second operand 26 states. [2018-11-07 22:11:35,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:35,829 INFO L93 Difference]: Finished difference Result 199 states and 200 transitions. [2018-11-07 22:11:35,829 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-07 22:11:35,829 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 186 [2018-11-07 22:11:35,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:35,832 INFO L225 Difference]: With dead ends: 199 [2018-11-07 22:11:35,832 INFO L226 Difference]: Without dead ends: 197 [2018-11-07 22:11:35,833 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 353 SyntacticMatches, 37 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 472 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=235, Invalid=521, Unknown=0, NotChecked=0, Total=756 [2018-11-07 22:11:35,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-11-07 22:11:35,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 197. [2018-11-07 22:11:35,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2018-11-07 22:11:35,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 198 transitions. [2018-11-07 22:11:35,841 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 198 transitions. Word has length 186 [2018-11-07 22:11:35,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:35,841 INFO L480 AbstractCegarLoop]: Abstraction has 197 states and 198 transitions. [2018-11-07 22:11:35,841 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-07 22:11:35,842 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 198 transitions. [2018-11-07 22:11:35,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-11-07 22:11:35,843 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:35,843 INFO L375 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 19, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:35,843 INFO L423 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:35,843 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:35,843 INFO L82 PathProgramCache]: Analyzing trace with hash -477047232, now seen corresponding path program 35 times [2018-11-07 22:11:35,843 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:35,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:35,844 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:35,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:35,844 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:35,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:36,583 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-11-07 22:11:36,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:36,584 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:36,584 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:36,584 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:36,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:36,584 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 22:11:36,594 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:11:36,594 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:11:36,662 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-11-07 22:11:36,662 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:11:36,667 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:36,710 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-11-07 22:11:36,710 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:37,441 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-11-07 22:11:37,461 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:37,462 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 41 [2018-11-07 22:11:37,462 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:37,462 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-11-07 22:11:37,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-11-07 22:11:37,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=421, Invalid=1219, Unknown=0, NotChecked=0, Total=1640 [2018-11-07 22:11:37,463 INFO L87 Difference]: Start difference. First operand 197 states and 198 transitions. Second operand 41 states. [2018-11-07 22:11:38,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:38,543 INFO L93 Difference]: Finished difference Result 284 states and 304 transitions. [2018-11-07 22:11:38,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-11-07 22:11:38,550 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 194 [2018-11-07 22:11:38,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:38,551 INFO L225 Difference]: With dead ends: 284 [2018-11-07 22:11:38,551 INFO L226 Difference]: Without dead ends: 199 [2018-11-07 22:11:38,553 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 448 GetRequests, 351 SyntacticMatches, 38 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1215 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=881, Invalid=2779, Unknown=0, NotChecked=0, Total=3660 [2018-11-07 22:11:38,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-11-07 22:11:38,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 199. [2018-11-07 22:11:38,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2018-11-07 22:11:38,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 200 transitions. [2018-11-07 22:11:38,564 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 200 transitions. Word has length 194 [2018-11-07 22:11:38,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:38,564 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 200 transitions. [2018-11-07 22:11:38,564 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-11-07 22:11:38,564 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 200 transitions. [2018-11-07 22:11:38,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2018-11-07 22:11:38,566 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:38,567 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:38,567 INFO L423 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:38,567 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:38,567 INFO L82 PathProgramCache]: Analyzing trace with hash 581280570, now seen corresponding path program 36 times [2018-11-07 22:11:38,567 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:38,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:38,568 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:11:38,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:38,568 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:38,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:39,063 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 415 proven. 718 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-11-07 22:11:39,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:39,063 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:39,063 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:39,063 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:39,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:39,064 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 22:11:39,073 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:11:39,074 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:11:39,122 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:11:39,123 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:11:39,128 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:39,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 416 proven. 666 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-11-07 22:11:39,246 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:39,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 416 proven. 666 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-11-07 22:11:39,904 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:39,904 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 27 [2018-11-07 22:11:39,904 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:39,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-11-07 22:11:39,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-11-07 22:11:39,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=459, Unknown=0, NotChecked=0, Total=702 [2018-11-07 22:11:39,906 INFO L87 Difference]: Start difference. First operand 199 states and 200 transitions. Second operand 27 states. [2018-11-07 22:11:40,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:40,175 INFO L93 Difference]: Finished difference Result 209 states and 210 transitions. [2018-11-07 22:11:40,175 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-07 22:11:40,175 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 196 [2018-11-07 22:11:40,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:40,180 INFO L225 Difference]: With dead ends: 209 [2018-11-07 22:11:40,180 INFO L226 Difference]: Without dead ends: 207 [2018-11-07 22:11:40,181 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 372 SyntacticMatches, 39 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=256, Invalid=556, Unknown=0, NotChecked=0, Total=812 [2018-11-07 22:11:40,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2018-11-07 22:11:40,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2018-11-07 22:11:40,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-11-07 22:11:40,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 208 transitions. [2018-11-07 22:11:40,190 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 208 transitions. Word has length 196 [2018-11-07 22:11:40,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:40,190 INFO L480 AbstractCegarLoop]: Abstraction has 207 states and 208 transitions. [2018-11-07 22:11:40,190 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-11-07 22:11:40,190 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 208 transitions. [2018-11-07 22:11:40,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-11-07 22:11:40,194 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:40,194 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:40,194 INFO L423 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:40,194 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:40,194 INFO L82 PathProgramCache]: Analyzing trace with hash -159505539, now seen corresponding path program 37 times [2018-11-07 22:11:40,195 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:40,195 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:40,195 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:11:40,195 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:40,195 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:40,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:41,003 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-11-07 22:11:41,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:41,004 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:41,004 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:41,004 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:41,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:41,004 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 22:11:41,014 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:41,014 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:11:41,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:41,075 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:41,111 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-11-07 22:11:41,111 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:41,629 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-11-07 22:11:41,648 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:41,648 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 43 [2018-11-07 22:11:41,648 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:41,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-11-07 22:11:41,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-11-07 22:11:41,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1343, Unknown=0, NotChecked=0, Total=1806 [2018-11-07 22:11:41,650 INFO L87 Difference]: Start difference. First operand 207 states and 208 transitions. Second operand 43 states. [2018-11-07 22:11:42,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:42,927 INFO L93 Difference]: Finished difference Result 298 states and 319 transitions. [2018-11-07 22:11:42,927 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-11-07 22:11:42,928 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 204 [2018-11-07 22:11:42,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:42,929 INFO L225 Difference]: With dead ends: 298 [2018-11-07 22:11:42,929 INFO L226 Difference]: Without dead ends: 209 [2018-11-07 22:11:42,930 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 369 SyntacticMatches, 40 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1349 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=967, Invalid=3065, Unknown=0, NotChecked=0, Total=4032 [2018-11-07 22:11:42,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2018-11-07 22:11:42,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 209. [2018-11-07 22:11:42,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2018-11-07 22:11:42,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 210 transitions. [2018-11-07 22:11:42,942 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 210 transitions. Word has length 204 [2018-11-07 22:11:42,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:42,942 INFO L480 AbstractCegarLoop]: Abstraction has 209 states and 210 transitions. [2018-11-07 22:11:42,942 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-11-07 22:11:42,942 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 210 transitions. [2018-11-07 22:11:42,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-11-07 22:11:42,944 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:42,944 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:42,944 INFO L423 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:42,944 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:42,945 INFO L82 PathProgramCache]: Analyzing trace with hash 307920887, now seen corresponding path program 38 times [2018-11-07 22:11:42,945 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:42,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:42,945 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:42,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:42,946 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:42,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:43,399 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 457 proven. 796 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-11-07 22:11:43,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:43,400 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:43,400 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:43,400 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:43,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:43,400 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 22:11:43,408 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:11:43,408 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:11:43,525 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-11-07 22:11:43,525 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:11:43,530 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:44,033 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 458 proven. 741 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-11-07 22:11:44,033 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:44,660 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 458 proven. 741 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-11-07 22:11:44,680 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:44,680 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 28 [2018-11-07 22:11:44,680 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:44,681 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-07 22:11:44,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-07 22:11:44,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=491, Unknown=0, NotChecked=0, Total=756 [2018-11-07 22:11:44,681 INFO L87 Difference]: Start difference. First operand 209 states and 210 transitions. Second operand 28 states. [2018-11-07 22:11:44,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:44,952 INFO L93 Difference]: Finished difference Result 219 states and 220 transitions. [2018-11-07 22:11:44,953 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-11-07 22:11:44,953 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 206 [2018-11-07 22:11:44,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:44,955 INFO L225 Difference]: With dead ends: 219 [2018-11-07 22:11:44,955 INFO L226 Difference]: Without dead ends: 217 [2018-11-07 22:11:44,955 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 391 SyntacticMatches, 41 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 564 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=278, Invalid=592, Unknown=0, NotChecked=0, Total=870 [2018-11-07 22:11:44,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2018-11-07 22:11:44,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 217. [2018-11-07 22:11:44,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2018-11-07 22:11:44,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 218 transitions. [2018-11-07 22:11:44,965 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 218 transitions. Word has length 206 [2018-11-07 22:11:44,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:44,966 INFO L480 AbstractCegarLoop]: Abstraction has 217 states and 218 transitions. [2018-11-07 22:11:44,966 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-07 22:11:44,966 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 218 transitions. [2018-11-07 22:11:44,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2018-11-07 22:11:44,967 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:44,967 INFO L375 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 21, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:44,968 INFO L423 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:44,968 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:44,968 INFO L82 PathProgramCache]: Analyzing trace with hash 941421370, now seen corresponding path program 39 times [2018-11-07 22:11:44,968 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:44,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:44,969 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:11:44,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:44,969 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:44,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:45,640 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-11-07 22:11:45,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:45,640 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:45,640 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:45,640 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:45,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:45,640 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 22:11:45,648 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:11:45,649 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:11:45,700 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:11:45,700 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:11:45,704 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:45,747 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-11-07 22:11:45,747 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:46,424 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-11-07 22:11:46,455 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:46,455 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 45 [2018-11-07 22:11:46,455 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:46,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-11-07 22:11:46,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-11-07 22:11:46,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=507, Invalid=1473, Unknown=0, NotChecked=0, Total=1980 [2018-11-07 22:11:46,457 INFO L87 Difference]: Start difference. First operand 217 states and 218 transitions. Second operand 45 states. [2018-11-07 22:11:47,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:47,942 INFO L93 Difference]: Finished difference Result 312 states and 334 transitions. [2018-11-07 22:11:47,942 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-11-07 22:11:47,942 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 214 [2018-11-07 22:11:47,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:47,943 INFO L225 Difference]: With dead ends: 312 [2018-11-07 22:11:47,944 INFO L226 Difference]: Without dead ends: 219 [2018-11-07 22:11:47,945 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 387 SyntacticMatches, 42 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1490 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1057, Invalid=3365, Unknown=0, NotChecked=0, Total=4422 [2018-11-07 22:11:47,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-11-07 22:11:47,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2018-11-07 22:11:47,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2018-11-07 22:11:47,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 220 transitions. [2018-11-07 22:11:47,956 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 220 transitions. Word has length 214 [2018-11-07 22:11:47,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:47,956 INFO L480 AbstractCegarLoop]: Abstraction has 219 states and 220 transitions. [2018-11-07 22:11:47,956 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-11-07 22:11:47,956 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 220 transitions. [2018-11-07 22:11:47,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2018-11-07 22:11:47,957 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:47,958 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:47,958 INFO L423 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:47,958 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:47,958 INFO L82 PathProgramCache]: Analyzing trace with hash 1446215476, now seen corresponding path program 40 times [2018-11-07 22:11:47,958 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:47,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:47,959 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:11:47,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:47,959 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:47,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:48,457 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 501 proven. 878 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2018-11-07 22:11:48,458 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:48,458 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:48,458 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:48,458 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:48,458 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:48,458 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 22:11:48,466 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:48,466 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:11:48,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:48,523 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:48,610 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 502 proven. 820 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-11-07 22:11:48,610 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:49,038 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 502 proven. 820 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-11-07 22:11:49,057 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:49,057 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 29 [2018-11-07 22:11:49,057 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:49,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-11-07 22:11:49,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-11-07 22:11:49,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=524, Unknown=0, NotChecked=0, Total=812 [2018-11-07 22:11:49,058 INFO L87 Difference]: Start difference. First operand 219 states and 220 transitions. Second operand 29 states. [2018-11-07 22:11:49,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:49,923 INFO L93 Difference]: Finished difference Result 229 states and 230 transitions. [2018-11-07 22:11:49,923 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-07 22:11:49,923 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 216 [2018-11-07 22:11:49,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:49,925 INFO L225 Difference]: With dead ends: 229 [2018-11-07 22:11:49,926 INFO L226 Difference]: Without dead ends: 227 [2018-11-07 22:11:49,926 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 410 SyntacticMatches, 43 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 613 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=301, Invalid=629, Unknown=0, NotChecked=0, Total=930 [2018-11-07 22:11:49,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2018-11-07 22:11:49,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 227. [2018-11-07 22:11:49,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 227 states. [2018-11-07 22:11:49,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 228 transitions. [2018-11-07 22:11:49,936 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 228 transitions. Word has length 216 [2018-11-07 22:11:49,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:49,937 INFO L480 AbstractCegarLoop]: Abstraction has 227 states and 228 transitions. [2018-11-07 22:11:49,937 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-11-07 22:11:49,937 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 228 transitions. [2018-11-07 22:11:49,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2018-11-07 22:11:49,938 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:49,939 INFO L375 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:49,939 INFO L423 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:49,939 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:49,939 INFO L82 PathProgramCache]: Analyzing trace with hash -1563073161, now seen corresponding path program 41 times [2018-11-07 22:11:49,939 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:49,940 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:49,940 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:49,940 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:49,940 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:49,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:52,657 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-11-07 22:11:52,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:52,657 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:52,658 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:52,658 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:52,658 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:52,658 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 22:11:52,678 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:11:52,678 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:11:52,808 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-11-07 22:11:52,809 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:11:52,813 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:52,849 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-11-07 22:11:52,849 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:53,452 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-11-07 22:11:53,471 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:53,472 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 47 [2018-11-07 22:11:53,472 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:53,472 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-11-07 22:11:53,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-11-07 22:11:53,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=553, Invalid=1609, Unknown=0, NotChecked=0, Total=2162 [2018-11-07 22:11:53,473 INFO L87 Difference]: Start difference. First operand 227 states and 228 transitions. Second operand 47 states. [2018-11-07 22:11:55,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:55,219 INFO L93 Difference]: Finished difference Result 326 states and 349 transitions. [2018-11-07 22:11:55,219 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-11-07 22:11:55,220 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 224 [2018-11-07 22:11:55,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:55,221 INFO L225 Difference]: With dead ends: 326 [2018-11-07 22:11:55,221 INFO L226 Difference]: Without dead ends: 229 [2018-11-07 22:11:55,222 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 405 SyntacticMatches, 44 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1638 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1151, Invalid=3679, Unknown=0, NotChecked=0, Total=4830 [2018-11-07 22:11:55,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2018-11-07 22:11:55,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 229. [2018-11-07 22:11:55,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2018-11-07 22:11:55,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 230 transitions. [2018-11-07 22:11:55,232 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 230 transitions. Word has length 224 [2018-11-07 22:11:55,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:55,233 INFO L480 AbstractCegarLoop]: Abstraction has 229 states and 230 transitions. [2018-11-07 22:11:55,233 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-11-07 22:11:55,233 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 230 transitions. [2018-11-07 22:11:55,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2018-11-07 22:11:55,234 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:55,234 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:55,235 INFO L423 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:55,235 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:55,235 INFO L82 PathProgramCache]: Analyzing trace with hash 835764465, now seen corresponding path program 42 times [2018-11-07 22:11:55,235 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:55,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:55,236 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:11:55,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:55,236 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:55,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:56,522 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 547 proven. 964 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2018-11-07 22:11:56,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:56,523 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:56,523 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:56,523 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:56,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:56,523 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 22:11:56,532 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:11:56,532 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:11:56,597 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:11:56,598 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:11:56,601 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:56,689 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 548 proven. 903 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-11-07 22:11:56,689 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:57,140 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 548 proven. 903 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-11-07 22:11:57,160 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:57,161 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27] total 30 [2018-11-07 22:11:57,161 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:57,161 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-11-07 22:11:57,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-11-07 22:11:57,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=558, Unknown=0, NotChecked=0, Total=870 [2018-11-07 22:11:57,162 INFO L87 Difference]: Start difference. First operand 229 states and 230 transitions. Second operand 30 states. [2018-11-07 22:11:57,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:11:57,445 INFO L93 Difference]: Finished difference Result 239 states and 240 transitions. [2018-11-07 22:11:57,445 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-07 22:11:57,446 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 226 [2018-11-07 22:11:57,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:11:57,448 INFO L225 Difference]: With dead ends: 239 [2018-11-07 22:11:57,448 INFO L226 Difference]: Without dead ends: 237 [2018-11-07 22:11:57,449 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 429 SyntacticMatches, 45 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 664 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=325, Invalid=667, Unknown=0, NotChecked=0, Total=992 [2018-11-07 22:11:57,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2018-11-07 22:11:57,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 237. [2018-11-07 22:11:57,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 237 states. [2018-11-07 22:11:57,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 238 transitions. [2018-11-07 22:11:57,459 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 238 transitions. Word has length 226 [2018-11-07 22:11:57,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:11:57,460 INFO L480 AbstractCegarLoop]: Abstraction has 237 states and 238 transitions. [2018-11-07 22:11:57,460 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-11-07 22:11:57,460 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 238 transitions. [2018-11-07 22:11:57,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2018-11-07 22:11:57,461 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:11:57,462 INFO L375 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 23, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:11:57,462 INFO L423 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:11:57,462 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:11:57,462 INFO L82 PathProgramCache]: Analyzing trace with hash 1747425844, now seen corresponding path program 43 times [2018-11-07 22:11:57,462 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:11:57,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:57,463 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:11:57,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:11:57,463 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:11:57,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:58,360 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-11-07 22:11:58,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:58,361 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:11:58,361 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:11:58,361 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:11:58,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:11:58,361 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:11:58,372 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:11:58,372 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:11:58,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:11:58,439 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:11:58,486 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-11-07 22:11:58,486 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:11:59,171 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-11-07 22:11:59,191 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:11:59,192 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 49 [2018-11-07 22:11:59,192 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:11:59,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-11-07 22:11:59,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-11-07 22:11:59,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=1751, Unknown=0, NotChecked=0, Total=2352 [2018-11-07 22:11:59,193 INFO L87 Difference]: Start difference. First operand 237 states and 238 transitions. Second operand 49 states. [2018-11-07 22:12:00,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:00,666 INFO L93 Difference]: Finished difference Result 340 states and 364 transitions. [2018-11-07 22:12:00,666 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-11-07 22:12:00,666 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 234 [2018-11-07 22:12:00,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:00,667 INFO L225 Difference]: With dead ends: 340 [2018-11-07 22:12:00,668 INFO L226 Difference]: Without dead ends: 239 [2018-11-07 22:12:00,669 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 540 GetRequests, 423 SyntacticMatches, 46 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1793 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1249, Invalid=4007, Unknown=0, NotChecked=0, Total=5256 [2018-11-07 22:12:00,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2018-11-07 22:12:00,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 239. [2018-11-07 22:12:00,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2018-11-07 22:12:00,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 240 transitions. [2018-11-07 22:12:00,680 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 240 transitions. Word has length 234 [2018-11-07 22:12:00,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:00,680 INFO L480 AbstractCegarLoop]: Abstraction has 239 states and 240 transitions. [2018-11-07 22:12:00,680 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-11-07 22:12:00,680 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 240 transitions. [2018-11-07 22:12:00,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2018-11-07 22:12:00,682 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:00,682 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:00,682 INFO L423 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:00,682 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:00,683 INFO L82 PathProgramCache]: Analyzing trace with hash -102079186, now seen corresponding path program 44 times [2018-11-07 22:12:00,683 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:00,683 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:00,683 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:00,683 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:00,684 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:00,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:02,128 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 595 proven. 1054 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-11-07 22:12:02,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:02,129 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:02,129 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:02,129 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:02,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:02,129 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:02,136 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:12:02,136 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:12:02,231 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-11-07 22:12:02,231 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:02,235 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:02,334 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 596 proven. 990 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-11-07 22:12:02,334 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:03,472 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 596 proven. 990 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-11-07 22:12:03,493 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:03,493 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 31 [2018-11-07 22:12:03,493 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:03,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-11-07 22:12:03,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-11-07 22:12:03,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=593, Unknown=0, NotChecked=0, Total=930 [2018-11-07 22:12:03,494 INFO L87 Difference]: Start difference. First operand 239 states and 240 transitions. Second operand 31 states. [2018-11-07 22:12:03,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:03,831 INFO L93 Difference]: Finished difference Result 249 states and 250 transitions. [2018-11-07 22:12:03,831 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-11-07 22:12:03,831 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 236 [2018-11-07 22:12:03,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:03,834 INFO L225 Difference]: With dead ends: 249 [2018-11-07 22:12:03,834 INFO L226 Difference]: Without dead ends: 247 [2018-11-07 22:12:03,835 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 448 SyntacticMatches, 47 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 717 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=350, Invalid=706, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 22:12:03,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-11-07 22:12:03,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 247. [2018-11-07 22:12:03,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2018-11-07 22:12:03,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 248 transitions. [2018-11-07 22:12:03,846 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 248 transitions. Word has length 236 [2018-11-07 22:12:03,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:03,846 INFO L480 AbstractCegarLoop]: Abstraction has 247 states and 248 transitions. [2018-11-07 22:12:03,846 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-11-07 22:12:03,846 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 248 transitions. [2018-11-07 22:12:03,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2018-11-07 22:12:03,848 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:03,848 INFO L375 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 24, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:03,848 INFO L423 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:03,848 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:03,848 INFO L82 PathProgramCache]: Analyzing trace with hash 850112881, now seen corresponding path program 45 times [2018-11-07 22:12:03,849 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:03,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:03,849 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:03,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:03,849 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:03,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:04,882 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-11-07 22:12:04,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:04,883 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:04,883 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:04,883 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:04,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:04,883 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:04,891 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:12:04,891 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:12:04,961 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:12:04,962 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:04,965 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:05,013 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-11-07 22:12:05,013 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:06,169 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-11-07 22:12:06,189 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:06,190 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 51 [2018-11-07 22:12:06,190 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:06,190 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-11-07 22:12:06,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-11-07 22:12:06,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=651, Invalid=1899, Unknown=0, NotChecked=0, Total=2550 [2018-11-07 22:12:06,191 INFO L87 Difference]: Start difference. First operand 247 states and 248 transitions. Second operand 51 states. [2018-11-07 22:12:07,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:07,022 INFO L93 Difference]: Finished difference Result 354 states and 379 transitions. [2018-11-07 22:12:07,022 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-11-07 22:12:07,022 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 244 [2018-11-07 22:12:07,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:07,024 INFO L225 Difference]: With dead ends: 354 [2018-11-07 22:12:07,024 INFO L226 Difference]: Without dead ends: 249 [2018-11-07 22:12:07,025 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 563 GetRequests, 441 SyntacticMatches, 48 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1955 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1351, Invalid=4349, Unknown=0, NotChecked=0, Total=5700 [2018-11-07 22:12:07,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2018-11-07 22:12:07,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 249. [2018-11-07 22:12:07,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 249 states. [2018-11-07 22:12:07,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 250 transitions. [2018-11-07 22:12:07,040 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 250 transitions. Word has length 244 [2018-11-07 22:12:07,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:07,040 INFO L480 AbstractCegarLoop]: Abstraction has 249 states and 250 transitions. [2018-11-07 22:12:07,040 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-11-07 22:12:07,040 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 250 transitions. [2018-11-07 22:12:07,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2018-11-07 22:12:07,042 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:07,043 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:07,043 INFO L423 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:07,043 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:07,043 INFO L82 PathProgramCache]: Analyzing trace with hash -699364373, now seen corresponding path program 46 times [2018-11-07 22:12:07,043 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:07,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:07,044 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:07,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:07,044 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:07,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:07,489 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 645 proven. 1148 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2018-11-07 22:12:07,490 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:07,490 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:07,490 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:07,490 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:07,490 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:07,490 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:07,499 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:07,499 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:12:07,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:07,568 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:07,690 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 646 proven. 1081 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-11-07 22:12:07,690 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:08,293 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 646 proven. 1081 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-11-07 22:12:08,313 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:08,313 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 32 [2018-11-07 22:12:08,313 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:08,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-11-07 22:12:08,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-11-07 22:12:08,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=629, Unknown=0, NotChecked=0, Total=992 [2018-11-07 22:12:08,314 INFO L87 Difference]: Start difference. First operand 249 states and 250 transitions. Second operand 32 states. [2018-11-07 22:12:08,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:08,656 INFO L93 Difference]: Finished difference Result 259 states and 260 transitions. [2018-11-07 22:12:08,657 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-11-07 22:12:08,657 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 246 [2018-11-07 22:12:08,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:08,659 INFO L225 Difference]: With dead ends: 259 [2018-11-07 22:12:08,659 INFO L226 Difference]: Without dead ends: 257 [2018-11-07 22:12:08,659 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 467 SyntacticMatches, 49 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 772 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=376, Invalid=746, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 22:12:08,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2018-11-07 22:12:08,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 257. [2018-11-07 22:12:08,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 257 states. [2018-11-07 22:12:08,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 258 transitions. [2018-11-07 22:12:08,670 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 258 transitions. Word has length 246 [2018-11-07 22:12:08,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:08,670 INFO L480 AbstractCegarLoop]: Abstraction has 257 states and 258 transitions. [2018-11-07 22:12:08,670 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-11-07 22:12:08,670 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 258 transitions. [2018-11-07 22:12:08,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2018-11-07 22:12:08,672 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:08,672 INFO L375 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 25, 24, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:08,672 INFO L423 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:08,672 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:08,673 INFO L82 PathProgramCache]: Analyzing trace with hash -401487058, now seen corresponding path program 47 times [2018-11-07 22:12:08,673 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:08,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:08,673 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:08,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:08,674 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:08,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:09,548 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-11-07 22:12:09,548 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:09,548 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:09,548 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:09,548 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:09,548 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:09,549 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:09,558 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:12:09,558 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:12:09,661 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-11-07 22:12:09,661 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:09,666 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:09,712 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-11-07 22:12:09,712 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:10,829 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-11-07 22:12:10,848 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:10,849 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 53 [2018-11-07 22:12:10,849 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:10,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-11-07 22:12:10,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-11-07 22:12:10,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=2053, Unknown=0, NotChecked=0, Total=2756 [2018-11-07 22:12:10,850 INFO L87 Difference]: Start difference. First operand 257 states and 258 transitions. Second operand 53 states. [2018-11-07 22:12:12,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:12,694 INFO L93 Difference]: Finished difference Result 368 states and 394 transitions. [2018-11-07 22:12:12,694 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-11-07 22:12:12,694 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 254 [2018-11-07 22:12:12,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:12,696 INFO L225 Difference]: With dead ends: 368 [2018-11-07 22:12:12,696 INFO L226 Difference]: Without dead ends: 259 [2018-11-07 22:12:12,697 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 459 SyntacticMatches, 50 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2124 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1457, Invalid=4705, Unknown=0, NotChecked=0, Total=6162 [2018-11-07 22:12:12,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2018-11-07 22:12:12,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 259. [2018-11-07 22:12:12,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2018-11-07 22:12:12,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 260 transitions. [2018-11-07 22:12:12,708 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 260 transitions. Word has length 254 [2018-11-07 22:12:12,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:12,708 INFO L480 AbstractCegarLoop]: Abstraction has 259 states and 260 transitions. [2018-11-07 22:12:12,708 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-11-07 22:12:12,708 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 260 transitions. [2018-11-07 22:12:12,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 257 [2018-11-07 22:12:12,710 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:12,710 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:12,710 INFO L423 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:12,710 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:12,710 INFO L82 PathProgramCache]: Analyzing trace with hash 65754408, now seen corresponding path program 48 times [2018-11-07 22:12:12,711 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:12,711 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:12,711 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:12,711 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:12,711 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:12,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:13,364 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 697 proven. 1246 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2018-11-07 22:12:13,364 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:13,364 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:13,365 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:13,365 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:13,365 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:13,365 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:13,373 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:12:13,373 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:12:13,446 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:12:13,446 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:13,450 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:14,351 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 698 proven. 1176 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-11-07 22:12:14,351 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:15,736 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 698 proven. 1176 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-11-07 22:12:15,756 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:15,757 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 33 [2018-11-07 22:12:15,757 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:15,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-11-07 22:12:15,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-11-07 22:12:15,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=390, Invalid=666, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 22:12:15,758 INFO L87 Difference]: Start difference. First operand 259 states and 260 transitions. Second operand 33 states. [2018-11-07 22:12:16,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:16,083 INFO L93 Difference]: Finished difference Result 269 states and 270 transitions. [2018-11-07 22:12:16,083 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-11-07 22:12:16,083 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 256 [2018-11-07 22:12:16,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:16,086 INFO L225 Difference]: With dead ends: 269 [2018-11-07 22:12:16,086 INFO L226 Difference]: Without dead ends: 267 [2018-11-07 22:12:16,087 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 486 SyntacticMatches, 51 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 829 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=403, Invalid=787, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 22:12:16,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2018-11-07 22:12:16,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 267. [2018-11-07 22:12:16,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 267 states. [2018-11-07 22:12:16,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 268 transitions. [2018-11-07 22:12:16,096 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 268 transitions. Word has length 256 [2018-11-07 22:12:16,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:16,096 INFO L480 AbstractCegarLoop]: Abstraction has 267 states and 268 transitions. [2018-11-07 22:12:16,096 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-11-07 22:12:16,097 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 268 transitions. [2018-11-07 22:12:16,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2018-11-07 22:12:16,099 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:16,099 INFO L375 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 26, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:16,099 INFO L423 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:16,100 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:16,100 INFO L82 PathProgramCache]: Analyzing trace with hash -350091413, now seen corresponding path program 49 times [2018-11-07 22:12:16,100 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:16,100 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:16,100 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:16,100 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:16,101 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:16,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:17,317 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-11-07 22:12:17,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:17,317 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:17,318 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:17,318 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:17,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:17,318 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:17,325 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:17,325 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:12:17,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:17,400 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:17,448 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-11-07 22:12:17,448 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:18,445 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-11-07 22:12:18,466 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:18,466 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 55 [2018-11-07 22:12:18,466 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:18,467 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-11-07 22:12:18,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-11-07 22:12:18,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=757, Invalid=2213, Unknown=0, NotChecked=0, Total=2970 [2018-11-07 22:12:18,468 INFO L87 Difference]: Start difference. First operand 267 states and 268 transitions. Second operand 55 states. [2018-11-07 22:12:20,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:20,027 INFO L93 Difference]: Finished difference Result 382 states and 409 transitions. [2018-11-07 22:12:20,027 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-11-07 22:12:20,027 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 264 [2018-11-07 22:12:20,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:20,028 INFO L225 Difference]: With dead ends: 382 [2018-11-07 22:12:20,028 INFO L226 Difference]: Without dead ends: 269 [2018-11-07 22:12:20,030 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 609 GetRequests, 477 SyntacticMatches, 52 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2300 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1567, Invalid=5075, Unknown=0, NotChecked=0, Total=6642 [2018-11-07 22:12:20,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2018-11-07 22:12:20,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 269. [2018-11-07 22:12:20,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2018-11-07 22:12:20,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 270 transitions. [2018-11-07 22:12:20,040 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 270 transitions. Word has length 264 [2018-11-07 22:12:20,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:20,040 INFO L480 AbstractCegarLoop]: Abstraction has 269 states and 270 transitions. [2018-11-07 22:12:20,040 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-11-07 22:12:20,040 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 270 transitions. [2018-11-07 22:12:20,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2018-11-07 22:12:20,042 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:20,042 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:20,042 INFO L423 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:20,042 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:20,042 INFO L82 PathProgramCache]: Analyzing trace with hash -1766137627, now seen corresponding path program 50 times [2018-11-07 22:12:20,042 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:20,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:20,043 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:20,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:20,043 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:20,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:20,793 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 751 proven. 1348 refuted. 0 times theorem prover too weak. 1128 trivial. 0 not checked. [2018-11-07 22:12:20,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:20,793 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:20,794 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:20,794 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:20,794 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:20,794 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:20,803 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:12:20,803 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:12:20,903 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-11-07 22:12:20,903 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:20,907 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:21,011 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 752 proven. 1275 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-11-07 22:12:21,011 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:21,828 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 752 proven. 1275 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-11-07 22:12:21,848 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:21,848 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 34 [2018-11-07 22:12:21,848 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:21,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-11-07 22:12:21,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-11-07 22:12:21,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=418, Invalid=704, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 22:12:21,849 INFO L87 Difference]: Start difference. First operand 269 states and 270 transitions. Second operand 34 states. [2018-11-07 22:12:22,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:22,205 INFO L93 Difference]: Finished difference Result 279 states and 280 transitions. [2018-11-07 22:12:22,205 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-11-07 22:12:22,206 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 266 [2018-11-07 22:12:22,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:22,208 INFO L225 Difference]: With dead ends: 279 [2018-11-07 22:12:22,208 INFO L226 Difference]: Without dead ends: 277 [2018-11-07 22:12:22,208 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 505 SyntacticMatches, 53 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 888 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=431, Invalid=829, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 22:12:22,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2018-11-07 22:12:22,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 277. [2018-11-07 22:12:22,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 277 states. [2018-11-07 22:12:22,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 278 transitions. [2018-11-07 22:12:22,219 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 278 transitions. Word has length 266 [2018-11-07 22:12:22,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:22,219 INFO L480 AbstractCegarLoop]: Abstraction has 277 states and 278 transitions. [2018-11-07 22:12:22,220 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-11-07 22:12:22,220 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 278 transitions. [2018-11-07 22:12:22,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2018-11-07 22:12:22,221 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:22,221 INFO L375 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 27, 26, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:22,222 INFO L423 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:22,222 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:22,222 INFO L82 PathProgramCache]: Analyzing trace with hash -574847448, now seen corresponding path program 51 times [2018-11-07 22:12:22,222 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:22,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:22,223 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:22,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:22,223 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:22,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:23,283 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-11-07 22:12:23,284 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:23,284 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:23,284 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:23,284 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:23,284 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:23,284 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:23,292 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:12:23,292 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:12:23,370 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:12:23,370 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:23,375 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:23,447 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-11-07 22:12:23,448 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:24,620 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-11-07 22:12:24,640 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:24,640 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 57 [2018-11-07 22:12:24,640 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:24,641 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-11-07 22:12:24,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-11-07 22:12:24,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=813, Invalid=2379, Unknown=0, NotChecked=0, Total=3192 [2018-11-07 22:12:24,641 INFO L87 Difference]: Start difference. First operand 277 states and 278 transitions. Second operand 57 states. [2018-11-07 22:12:26,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:26,400 INFO L93 Difference]: Finished difference Result 396 states and 424 transitions. [2018-11-07 22:12:26,400 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-11-07 22:12:26,400 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 274 [2018-11-07 22:12:26,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:26,401 INFO L225 Difference]: With dead ends: 396 [2018-11-07 22:12:26,401 INFO L226 Difference]: Without dead ends: 279 [2018-11-07 22:12:26,402 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 632 GetRequests, 495 SyntacticMatches, 54 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2483 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1681, Invalid=5459, Unknown=0, NotChecked=0, Total=7140 [2018-11-07 22:12:26,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2018-11-07 22:12:26,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 279. [2018-11-07 22:12:26,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 279 states. [2018-11-07 22:12:26,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 280 transitions. [2018-11-07 22:12:26,414 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 280 transitions. Word has length 274 [2018-11-07 22:12:26,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:26,414 INFO L480 AbstractCegarLoop]: Abstraction has 279 states and 280 transitions. [2018-11-07 22:12:26,414 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-11-07 22:12:26,414 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 280 transitions. [2018-11-07 22:12:26,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2018-11-07 22:12:26,416 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:26,416 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:26,416 INFO L423 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:26,416 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:26,417 INFO L82 PathProgramCache]: Analyzing trace with hash -1143517406, now seen corresponding path program 52 times [2018-11-07 22:12:26,417 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:26,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:26,417 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:26,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:26,418 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:26,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:27,286 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 807 proven. 1454 refuted. 0 times theorem prover too weak. 1225 trivial. 0 not checked. [2018-11-07 22:12:27,286 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:27,286 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:27,286 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:27,286 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:27,286 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:27,286 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:27,295 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:27,295 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:12:27,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:27,375 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:27,480 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 808 proven. 1378 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-11-07 22:12:27,480 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:28,173 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 808 proven. 1378 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-11-07 22:12:28,192 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:28,192 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 35 [2018-11-07 22:12:28,193 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:28,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-11-07 22:12:28,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-11-07 22:12:28,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=447, Invalid=743, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 22:12:28,194 INFO L87 Difference]: Start difference. First operand 279 states and 280 transitions. Second operand 35 states. [2018-11-07 22:12:28,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:28,632 INFO L93 Difference]: Finished difference Result 289 states and 290 transitions. [2018-11-07 22:12:28,632 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-11-07 22:12:28,632 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 276 [2018-11-07 22:12:28,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:28,634 INFO L225 Difference]: With dead ends: 289 [2018-11-07 22:12:28,634 INFO L226 Difference]: Without dead ends: 287 [2018-11-07 22:12:28,635 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 614 GetRequests, 524 SyntacticMatches, 55 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 949 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=460, Invalid=872, Unknown=0, NotChecked=0, Total=1332 [2018-11-07 22:12:28,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2018-11-07 22:12:28,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 287. [2018-11-07 22:12:28,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2018-11-07 22:12:28,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 288 transitions. [2018-11-07 22:12:28,646 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 288 transitions. Word has length 276 [2018-11-07 22:12:28,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:28,647 INFO L480 AbstractCegarLoop]: Abstraction has 287 states and 288 transitions. [2018-11-07 22:12:28,647 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-11-07 22:12:28,647 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 288 transitions. [2018-11-07 22:12:28,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2018-11-07 22:12:28,648 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:28,649 INFO L375 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 28, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:28,649 INFO L423 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:28,649 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:28,649 INFO L82 PathProgramCache]: Analyzing trace with hash -489068699, now seen corresponding path program 53 times [2018-11-07 22:12:28,649 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:28,650 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:28,650 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:28,650 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:28,650 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:28,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:29,880 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-11-07 22:12:29,880 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:29,880 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:29,881 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:29,881 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:29,881 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:29,881 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:29,891 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:12:29,892 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:12:29,999 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-11-07 22:12:29,999 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:30,006 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:30,062 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-11-07 22:12:30,063 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:31,427 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-11-07 22:12:31,447 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:31,447 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 59 [2018-11-07 22:12:31,447 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:31,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-11-07 22:12:31,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-11-07 22:12:31,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=871, Invalid=2551, Unknown=0, NotChecked=0, Total=3422 [2018-11-07 22:12:31,449 INFO L87 Difference]: Start difference. First operand 287 states and 288 transitions. Second operand 59 states. [2018-11-07 22:12:32,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:32,764 INFO L93 Difference]: Finished difference Result 410 states and 439 transitions. [2018-11-07 22:12:32,765 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-11-07 22:12:32,765 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 284 [2018-11-07 22:12:32,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:32,766 INFO L225 Difference]: With dead ends: 410 [2018-11-07 22:12:32,766 INFO L226 Difference]: Without dead ends: 289 [2018-11-07 22:12:32,768 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 655 GetRequests, 513 SyntacticMatches, 56 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2673 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1799, Invalid=5857, Unknown=0, NotChecked=0, Total=7656 [2018-11-07 22:12:32,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2018-11-07 22:12:32,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2018-11-07 22:12:32,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 289 states. [2018-11-07 22:12:32,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 290 transitions. [2018-11-07 22:12:32,781 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 290 transitions. Word has length 284 [2018-11-07 22:12:32,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:32,781 INFO L480 AbstractCegarLoop]: Abstraction has 289 states and 290 transitions. [2018-11-07 22:12:32,781 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-11-07 22:12:32,781 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 290 transitions. [2018-11-07 22:12:32,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2018-11-07 22:12:32,783 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:32,783 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 28, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:32,784 INFO L423 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:32,784 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:32,784 INFO L82 PathProgramCache]: Analyzing trace with hash 2070986719, now seen corresponding path program 54 times [2018-11-07 22:12:32,784 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:32,784 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:32,785 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:32,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:32,785 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:32,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:33,417 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 865 proven. 1564 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2018-11-07 22:12:33,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:33,418 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:33,418 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:33,418 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:33,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:33,418 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:33,428 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:12:33,428 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:12:33,502 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:12:33,502 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:33,507 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:33,620 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 866 proven. 1485 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-11-07 22:12:33,621 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:34,332 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 866 proven. 1485 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-11-07 22:12:34,352 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:34,352 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33] total 36 [2018-11-07 22:12:34,352 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:34,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-11-07 22:12:34,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-11-07 22:12:34,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=783, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 22:12:34,353 INFO L87 Difference]: Start difference. First operand 289 states and 290 transitions. Second operand 36 states. [2018-11-07 22:12:34,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:34,749 INFO L93 Difference]: Finished difference Result 299 states and 300 transitions. [2018-11-07 22:12:34,749 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-11-07 22:12:34,749 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 286 [2018-11-07 22:12:34,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:34,751 INFO L225 Difference]: With dead ends: 299 [2018-11-07 22:12:34,751 INFO L226 Difference]: Without dead ends: 297 [2018-11-07 22:12:34,751 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 636 GetRequests, 543 SyntacticMatches, 57 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1012 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=490, Invalid=916, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 22:12:34,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2018-11-07 22:12:34,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 297. [2018-11-07 22:12:34,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 297 states. [2018-11-07 22:12:34,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 298 transitions. [2018-11-07 22:12:34,763 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 298 transitions. Word has length 286 [2018-11-07 22:12:34,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:34,763 INFO L480 AbstractCegarLoop]: Abstraction has 297 states and 298 transitions. [2018-11-07 22:12:34,763 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-11-07 22:12:34,763 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 298 transitions. [2018-11-07 22:12:34,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2018-11-07 22:12:34,765 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:34,765 INFO L375 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 29, 28, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:34,765 INFO L423 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:34,765 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:34,766 INFO L82 PathProgramCache]: Analyzing trace with hash 1619577634, now seen corresponding path program 55 times [2018-11-07 22:12:34,766 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:34,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:34,766 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:34,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:34,767 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:34,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:36,481 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-11-07 22:12:36,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:36,482 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:36,482 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:36,482 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:36,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:36,482 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:36,491 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:36,491 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:12:36,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:36,575 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:36,653 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-11-07 22:12:36,654 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:37,712 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-11-07 22:12:37,731 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:37,731 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 61 [2018-11-07 22:12:37,731 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:37,732 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-11-07 22:12:37,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-11-07 22:12:37,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=931, Invalid=2729, Unknown=0, NotChecked=0, Total=3660 [2018-11-07 22:12:37,732 INFO L87 Difference]: Start difference. First operand 297 states and 298 transitions. Second operand 61 states. [2018-11-07 22:12:40,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:40,009 INFO L93 Difference]: Finished difference Result 424 states and 454 transitions. [2018-11-07 22:12:40,009 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-11-07 22:12:40,009 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 294 [2018-11-07 22:12:40,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:40,010 INFO L225 Difference]: With dead ends: 424 [2018-11-07 22:12:40,010 INFO L226 Difference]: Without dead ends: 299 [2018-11-07 22:12:40,012 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 678 GetRequests, 531 SyntacticMatches, 58 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2870 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1921, Invalid=6269, Unknown=0, NotChecked=0, Total=8190 [2018-11-07 22:12:40,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2018-11-07 22:12:40,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 299. [2018-11-07 22:12:40,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 299 states. [2018-11-07 22:12:40,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 300 transitions. [2018-11-07 22:12:40,025 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 300 transitions. Word has length 294 [2018-11-07 22:12:40,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:40,025 INFO L480 AbstractCegarLoop]: Abstraction has 299 states and 300 transitions. [2018-11-07 22:12:40,025 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-11-07 22:12:40,025 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 300 transitions. [2018-11-07 22:12:40,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2018-11-07 22:12:40,027 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:40,027 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:40,028 INFO L423 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:40,028 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:40,028 INFO L82 PathProgramCache]: Analyzing trace with hash -87076068, now seen corresponding path program 56 times [2018-11-07 22:12:40,028 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:40,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:40,029 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:40,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:40,029 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:40,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:40,695 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 925 proven. 1678 refuted. 0 times theorem prover too weak. 1431 trivial. 0 not checked. [2018-11-07 22:12:40,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:40,696 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:40,696 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:40,696 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:40,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:40,696 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:40,704 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:12:40,705 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:12:40,824 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-11-07 22:12:40,824 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:40,829 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:41,047 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 926 proven. 1596 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-11-07 22:12:41,047 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:41,788 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 926 proven. 1596 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-11-07 22:12:41,808 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:41,808 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 37 [2018-11-07 22:12:41,808 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:41,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-11-07 22:12:41,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-11-07 22:12:41,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=508, Invalid=824, Unknown=0, NotChecked=0, Total=1332 [2018-11-07 22:12:41,809 INFO L87 Difference]: Start difference. First operand 299 states and 300 transitions. Second operand 37 states. [2018-11-07 22:12:42,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:42,282 INFO L93 Difference]: Finished difference Result 309 states and 310 transitions. [2018-11-07 22:12:42,283 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-11-07 22:12:42,283 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 296 [2018-11-07 22:12:42,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:42,285 INFO L225 Difference]: With dead ends: 309 [2018-11-07 22:12:42,285 INFO L226 Difference]: Without dead ends: 307 [2018-11-07 22:12:42,285 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 658 GetRequests, 562 SyntacticMatches, 59 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1077 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=521, Invalid=961, Unknown=0, NotChecked=0, Total=1482 [2018-11-07 22:12:42,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2018-11-07 22:12:42,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 307. [2018-11-07 22:12:42,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 307 states. [2018-11-07 22:12:42,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 308 transitions. [2018-11-07 22:12:42,294 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 308 transitions. Word has length 296 [2018-11-07 22:12:42,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:42,294 INFO L480 AbstractCegarLoop]: Abstraction has 307 states and 308 transitions. [2018-11-07 22:12:42,294 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-11-07 22:12:42,294 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 308 transitions. [2018-11-07 22:12:42,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2018-11-07 22:12:42,296 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:42,296 INFO L375 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 30, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:42,296 INFO L423 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:42,296 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:42,296 INFO L82 PathProgramCache]: Analyzing trace with hash 1106432351, now seen corresponding path program 57 times [2018-11-07 22:12:42,296 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:42,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:42,297 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:42,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:42,297 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:42,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:43,577 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-11-07 22:12:43,578 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:43,578 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:43,578 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:43,578 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:43,578 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:43,578 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:43,588 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:12:43,588 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:12:43,676 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:12:43,676 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:43,682 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:43,740 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-11-07 22:12:43,740 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:44,851 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-11-07 22:12:44,871 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:44,871 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 63 [2018-11-07 22:12:44,872 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:44,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-11-07 22:12:44,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-11-07 22:12:44,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=993, Invalid=2913, Unknown=0, NotChecked=0, Total=3906 [2018-11-07 22:12:44,873 INFO L87 Difference]: Start difference. First operand 307 states and 308 transitions. Second operand 63 states. [2018-11-07 22:12:46,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:46,969 INFO L93 Difference]: Finished difference Result 438 states and 469 transitions. [2018-11-07 22:12:46,969 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-11-07 22:12:46,969 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 304 [2018-11-07 22:12:46,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:46,970 INFO L225 Difference]: With dead ends: 438 [2018-11-07 22:12:46,970 INFO L226 Difference]: Without dead ends: 309 [2018-11-07 22:12:46,972 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 701 GetRequests, 549 SyntacticMatches, 60 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3074 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2047, Invalid=6695, Unknown=0, NotChecked=0, Total=8742 [2018-11-07 22:12:46,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2018-11-07 22:12:46,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 309. [2018-11-07 22:12:46,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 309 states. [2018-11-07 22:12:46,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 310 transitions. [2018-11-07 22:12:46,985 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 310 transitions. Word has length 304 [2018-11-07 22:12:46,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:46,985 INFO L480 AbstractCegarLoop]: Abstraction has 309 states and 310 transitions. [2018-11-07 22:12:46,985 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-11-07 22:12:46,985 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 310 transitions. [2018-11-07 22:12:46,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2018-11-07 22:12:46,987 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:46,987 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 30, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:46,987 INFO L423 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:46,987 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:46,988 INFO L82 PathProgramCache]: Analyzing trace with hash 1045637337, now seen corresponding path program 58 times [2018-11-07 22:12:46,988 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:46,988 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:46,988 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:46,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:46,989 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:47,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:47,800 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 987 proven. 1796 refuted. 0 times theorem prover too weak. 1540 trivial. 0 not checked. [2018-11-07 22:12:47,801 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:47,801 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:47,801 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:47,801 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:47,801 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:47,801 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:47,812 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:47,812 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:12:47,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:47,901 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:48,020 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 988 proven. 1711 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-11-07 22:12:48,020 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:48,799 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 988 proven. 1711 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-11-07 22:12:48,818 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:48,818 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 38 [2018-11-07 22:12:48,819 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:48,819 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-11-07 22:12:48,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-11-07 22:12:48,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=866, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 22:12:48,820 INFO L87 Difference]: Start difference. First operand 309 states and 310 transitions. Second operand 38 states. [2018-11-07 22:12:49,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:49,260 INFO L93 Difference]: Finished difference Result 319 states and 320 transitions. [2018-11-07 22:12:49,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-11-07 22:12:49,261 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 306 [2018-11-07 22:12:49,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:49,263 INFO L225 Difference]: With dead ends: 319 [2018-11-07 22:12:49,263 INFO L226 Difference]: Without dead ends: 317 [2018-11-07 22:12:49,264 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 680 GetRequests, 581 SyntacticMatches, 61 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1144 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=553, Invalid=1007, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 22:12:49,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2018-11-07 22:12:49,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 317. [2018-11-07 22:12:49,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 317 states. [2018-11-07 22:12:49,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 318 transitions. [2018-11-07 22:12:49,273 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 318 transitions. Word has length 306 [2018-11-07 22:12:49,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:49,273 INFO L480 AbstractCegarLoop]: Abstraction has 317 states and 318 transitions. [2018-11-07 22:12:49,273 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-11-07 22:12:49,273 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 318 transitions. [2018-11-07 22:12:49,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2018-11-07 22:12:49,275 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:49,275 INFO L375 BasicCegarLoop]: trace histogram [31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:49,275 INFO L423 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:49,275 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:49,276 INFO L82 PathProgramCache]: Analyzing trace with hash -1185441252, now seen corresponding path program 59 times [2018-11-07 22:12:49,276 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:49,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:49,276 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:49,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:49,277 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:49,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:50,554 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-11-07 22:12:50,554 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:50,554 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:50,554 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:50,554 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:50,554 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:50,555 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:50,566 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:12:50,567 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:12:50,686 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2018-11-07 22:12:50,686 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:50,692 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:50,760 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-11-07 22:12:50,760 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:52,217 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-11-07 22:12:52,239 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:52,239 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 65 [2018-11-07 22:12:52,239 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:52,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-11-07 22:12:52,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-11-07 22:12:52,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1057, Invalid=3103, Unknown=0, NotChecked=0, Total=4160 [2018-11-07 22:12:52,240 INFO L87 Difference]: Start difference. First operand 317 states and 318 transitions. Second operand 65 states. [2018-11-07 22:12:53,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:53,548 INFO L93 Difference]: Finished difference Result 452 states and 484 transitions. [2018-11-07 22:12:53,548 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-11-07 22:12:53,548 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 314 [2018-11-07 22:12:53,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:53,549 INFO L225 Difference]: With dead ends: 452 [2018-11-07 22:12:53,549 INFO L226 Difference]: Without dead ends: 319 [2018-11-07 22:12:53,551 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 724 GetRequests, 567 SyntacticMatches, 62 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3285 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2177, Invalid=7135, Unknown=0, NotChecked=0, Total=9312 [2018-11-07 22:12:53,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2018-11-07 22:12:53,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 319. [2018-11-07 22:12:53,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 319 states. [2018-11-07 22:12:53,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 320 transitions. [2018-11-07 22:12:53,565 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 320 transitions. Word has length 314 [2018-11-07 22:12:53,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:53,565 INFO L480 AbstractCegarLoop]: Abstraction has 319 states and 320 transitions. [2018-11-07 22:12:53,565 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-11-07 22:12:53,566 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 320 transitions. [2018-11-07 22:12:53,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2018-11-07 22:12:53,567 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:53,568 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 31, 31, 31, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:53,568 INFO L423 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:53,568 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:53,568 INFO L82 PathProgramCache]: Analyzing trace with hash 1802789142, now seen corresponding path program 60 times [2018-11-07 22:12:53,568 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:53,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:53,569 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:53,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:53,569 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:53,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:54,150 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1051 proven. 1918 refuted. 0 times theorem prover too weak. 1653 trivial. 0 not checked. [2018-11-07 22:12:54,150 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:54,151 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:54,151 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:54,151 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:54,151 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:54,151 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:54,177 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:12:54,177 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:12:54,265 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:12:54,265 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:54,271 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:54,389 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1052 proven. 1830 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-11-07 22:12:54,389 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:55,223 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1052 proven. 1830 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-11-07 22:12:55,242 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:55,242 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36, 36] total 39 [2018-11-07 22:12:55,242 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:55,243 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-11-07 22:12:55,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-11-07 22:12:55,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=909, Unknown=0, NotChecked=0, Total=1482 [2018-11-07 22:12:55,244 INFO L87 Difference]: Start difference. First operand 319 states and 320 transitions. Second operand 39 states. [2018-11-07 22:12:55,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:55,702 INFO L93 Difference]: Finished difference Result 329 states and 330 transitions. [2018-11-07 22:12:55,703 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-11-07 22:12:55,703 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 316 [2018-11-07 22:12:55,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:55,705 INFO L225 Difference]: With dead ends: 329 [2018-11-07 22:12:55,705 INFO L226 Difference]: Without dead ends: 327 [2018-11-07 22:12:55,706 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 702 GetRequests, 600 SyntacticMatches, 63 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1213 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=586, Invalid=1054, Unknown=0, NotChecked=0, Total=1640 [2018-11-07 22:12:55,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2018-11-07 22:12:55,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 327. [2018-11-07 22:12:55,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 327 states. [2018-11-07 22:12:55,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 328 transitions. [2018-11-07 22:12:55,716 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 328 transitions. Word has length 316 [2018-11-07 22:12:55,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:55,717 INFO L480 AbstractCegarLoop]: Abstraction has 327 states and 328 transitions. [2018-11-07 22:12:55,717 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-11-07 22:12:55,717 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 328 transitions. [2018-11-07 22:12:55,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2018-11-07 22:12:55,719 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:55,719 INFO L375 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 32, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:55,719 INFO L423 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:55,720 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:55,720 INFO L82 PathProgramCache]: Analyzing trace with hash -2112928423, now seen corresponding path program 61 times [2018-11-07 22:12:55,720 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:55,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:55,721 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:55,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:55,721 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:55,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:57,524 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-11-07 22:12:57,524 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:57,525 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:57,525 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:57,525 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:57,525 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:57,525 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:57,533 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:57,533 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:12:57,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:57,628 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:57,716 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-11-07 22:12:57,716 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:59,000 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-11-07 22:12:59,021 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:59,021 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 67 [2018-11-07 22:12:59,021 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:59,024 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-11-07 22:12:59,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-11-07 22:12:59,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1123, Invalid=3299, Unknown=0, NotChecked=0, Total=4422 [2018-11-07 22:12:59,024 INFO L87 Difference]: Start difference. First operand 327 states and 328 transitions. Second operand 67 states. [2018-11-07 22:13:01,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:01,024 INFO L93 Difference]: Finished difference Result 466 states and 499 transitions. [2018-11-07 22:13:01,024 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-11-07 22:13:01,025 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 324 [2018-11-07 22:13:01,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:01,026 INFO L225 Difference]: With dead ends: 466 [2018-11-07 22:13:01,026 INFO L226 Difference]: Without dead ends: 329 [2018-11-07 22:13:01,027 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 747 GetRequests, 585 SyntacticMatches, 64 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3503 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2311, Invalid=7589, Unknown=0, NotChecked=0, Total=9900 [2018-11-07 22:13:01,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2018-11-07 22:13:01,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 329. [2018-11-07 22:13:01,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 329 states. [2018-11-07 22:13:01,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 330 transitions. [2018-11-07 22:13:01,039 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 330 transitions. Word has length 324 [2018-11-07 22:13:01,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:01,039 INFO L480 AbstractCegarLoop]: Abstraction has 329 states and 330 transitions. [2018-11-07 22:13:01,039 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-11-07 22:13:01,040 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 330 transitions. [2018-11-07 22:13:01,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2018-11-07 22:13:01,041 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:01,042 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:01,042 INFO L423 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:01,042 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:01,042 INFO L82 PathProgramCache]: Analyzing trace with hash -1966924845, now seen corresponding path program 62 times [2018-11-07 22:13:01,042 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:01,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:01,043 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:13:01,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:01,043 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:01,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:01,923 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1117 proven. 2044 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2018-11-07 22:13:01,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:01,923 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:01,923 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:01,923 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:01,924 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:01,924 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:01,950 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:13:01,950 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:13:02,086 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-11-07 22:13:02,086 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:02,091 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:02,248 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1118 proven. 1953 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-11-07 22:13:02,248 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:03,124 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1118 proven. 1953 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-11-07 22:13:03,144 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:03,144 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37] total 40 [2018-11-07 22:13:03,144 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:03,145 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-11-07 22:13:03,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-11-07 22:13:03,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=607, Invalid=953, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 22:13:03,145 INFO L87 Difference]: Start difference. First operand 329 states and 330 transitions. Second operand 40 states. [2018-11-07 22:13:03,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:03,583 INFO L93 Difference]: Finished difference Result 339 states and 340 transitions. [2018-11-07 22:13:03,584 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-11-07 22:13:03,584 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 326 [2018-11-07 22:13:03,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:03,586 INFO L225 Difference]: With dead ends: 339 [2018-11-07 22:13:03,587 INFO L226 Difference]: Without dead ends: 337 [2018-11-07 22:13:03,587 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 724 GetRequests, 619 SyntacticMatches, 65 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1284 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=620, Invalid=1102, Unknown=0, NotChecked=0, Total=1722 [2018-11-07 22:13:03,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2018-11-07 22:13:03,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 337. [2018-11-07 22:13:03,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 337 states. [2018-11-07 22:13:03,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 338 transitions. [2018-11-07 22:13:03,603 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 338 transitions. Word has length 326 [2018-11-07 22:13:03,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:03,603 INFO L480 AbstractCegarLoop]: Abstraction has 337 states and 338 transitions. [2018-11-07 22:13:03,603 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-11-07 22:13:03,603 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 338 transitions. [2018-11-07 22:13:03,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2018-11-07 22:13:03,605 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:03,605 INFO L375 BasicCegarLoop]: trace histogram [33, 33, 33, 33, 33, 32, 32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:03,606 INFO L423 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:03,606 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:03,606 INFO L82 PathProgramCache]: Analyzing trace with hash -1568017642, now seen corresponding path program 63 times [2018-11-07 22:13:03,606 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:03,607 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:03,607 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:13:03,607 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:03,607 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:03,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:05,108 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-11-07 22:13:05,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:05,108 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:05,108 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:05,109 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:05,109 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:05,109 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:05,136 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:13:05,137 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:13:05,227 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:13:05,227 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:05,233 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:05,311 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-11-07 22:13:05,311 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:07,040 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-11-07 22:13:07,061 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:07,061 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 69 [2018-11-07 22:13:07,061 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:07,062 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-11-07 22:13:07,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-11-07 22:13:07,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1191, Invalid=3501, Unknown=0, NotChecked=0, Total=4692 [2018-11-07 22:13:07,062 INFO L87 Difference]: Start difference. First operand 337 states and 338 transitions. Second operand 69 states. [2018-11-07 22:13:09,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:09,114 INFO L93 Difference]: Finished difference Result 480 states and 514 transitions. [2018-11-07 22:13:09,115 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-11-07 22:13:09,115 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 334 [2018-11-07 22:13:09,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:09,116 INFO L225 Difference]: With dead ends: 480 [2018-11-07 22:13:09,116 INFO L226 Difference]: Without dead ends: 339 [2018-11-07 22:13:09,118 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 770 GetRequests, 603 SyntacticMatches, 66 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3728 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=2449, Invalid=8057, Unknown=0, NotChecked=0, Total=10506 [2018-11-07 22:13:09,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2018-11-07 22:13:09,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 339. [2018-11-07 22:13:09,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 339 states. [2018-11-07 22:13:09,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 339 states to 339 states and 340 transitions. [2018-11-07 22:13:09,132 INFO L78 Accepts]: Start accepts. Automaton has 339 states and 340 transitions. Word has length 334 [2018-11-07 22:13:09,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:09,132 INFO L480 AbstractCegarLoop]: Abstraction has 339 states and 340 transitions. [2018-11-07 22:13:09,132 INFO L481 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-11-07 22:13:09,132 INFO L276 IsEmpty]: Start isEmpty. Operand 339 states and 340 transitions. [2018-11-07 22:13:09,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2018-11-07 22:13:09,134 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:09,134 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 33, 33, 33, 32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:09,134 INFO L423 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:09,134 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:09,134 INFO L82 PathProgramCache]: Analyzing trace with hash -907577072, now seen corresponding path program 64 times [2018-11-07 22:13:09,134 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:09,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:09,135 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:13:09,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:09,135 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:09,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:09,807 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1185 proven. 2174 refuted. 0 times theorem prover too weak. 1891 trivial. 0 not checked. [2018-11-07 22:13:09,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:09,807 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:09,807 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:09,807 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:09,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:09,808 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:09,816 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:13:09,816 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:13:09,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:09,914 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:10,047 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1186 proven. 2080 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-11-07 22:13:10,047 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:11,015 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1186 proven. 2080 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-11-07 22:13:11,035 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:11,036 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 41 [2018-11-07 22:13:11,036 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:11,036 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-11-07 22:13:11,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-11-07 22:13:11,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=642, Invalid=998, Unknown=0, NotChecked=0, Total=1640 [2018-11-07 22:13:11,037 INFO L87 Difference]: Start difference. First operand 339 states and 340 transitions. Second operand 41 states. [2018-11-07 22:13:11,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:11,617 INFO L93 Difference]: Finished difference Result 349 states and 350 transitions. [2018-11-07 22:13:11,617 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-11-07 22:13:11,617 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 336 [2018-11-07 22:13:11,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:11,619 INFO L225 Difference]: With dead ends: 349 [2018-11-07 22:13:11,619 INFO L226 Difference]: Without dead ends: 347 [2018-11-07 22:13:11,620 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 746 GetRequests, 638 SyntacticMatches, 67 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1357 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=655, Invalid=1151, Unknown=0, NotChecked=0, Total=1806 [2018-11-07 22:13:11,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2018-11-07 22:13:11,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 347. [2018-11-07 22:13:11,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 347 states. [2018-11-07 22:13:11,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 347 states to 347 states and 348 transitions. [2018-11-07 22:13:11,631 INFO L78 Accepts]: Start accepts. Automaton has 347 states and 348 transitions. Word has length 336 [2018-11-07 22:13:11,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:11,631 INFO L480 AbstractCegarLoop]: Abstraction has 347 states and 348 transitions. [2018-11-07 22:13:11,631 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-11-07 22:13:11,631 INFO L276 IsEmpty]: Start isEmpty. Operand 347 states and 348 transitions. [2018-11-07 22:13:11,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2018-11-07 22:13:11,633 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:11,633 INFO L375 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 34, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:11,634 INFO L423 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:11,634 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:11,634 INFO L82 PathProgramCache]: Analyzing trace with hash -1370504365, now seen corresponding path program 65 times [2018-11-07 22:13:11,634 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:11,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:11,635 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:13:11,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:11,635 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:11,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:13,193 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-11-07 22:13:13,193 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:13,193 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:13,193 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:13,193 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:13,193 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:13,194 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:13,202 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:13:13,203 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:13:13,341 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-11-07 22:13:13,341 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:13,347 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:13,423 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-11-07 22:13:13,423 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:14,793 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-11-07 22:13:14,813 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:14,813 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 71 [2018-11-07 22:13:14,813 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:14,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-11-07 22:13:14,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-11-07 22:13:14,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1261, Invalid=3709, Unknown=0, NotChecked=0, Total=4970 [2018-11-07 22:13:14,815 INFO L87 Difference]: Start difference. First operand 347 states and 348 transitions. Second operand 71 states. [2018-11-07 22:13:16,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:16,497 INFO L93 Difference]: Finished difference Result 494 states and 529 transitions. [2018-11-07 22:13:16,497 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-11-07 22:13:16,497 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 344 [2018-11-07 22:13:16,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:16,498 INFO L225 Difference]: With dead ends: 494 [2018-11-07 22:13:16,498 INFO L226 Difference]: Without dead ends: 349 [2018-11-07 22:13:16,500 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 793 GetRequests, 621 SyntacticMatches, 68 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3960 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=2591, Invalid=8539, Unknown=0, NotChecked=0, Total=11130 [2018-11-07 22:13:16,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2018-11-07 22:13:16,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 349. [2018-11-07 22:13:16,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 349 states. [2018-11-07 22:13:16,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 350 transitions. [2018-11-07 22:13:16,514 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 350 transitions. Word has length 344 [2018-11-07 22:13:16,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:16,514 INFO L480 AbstractCegarLoop]: Abstraction has 349 states and 350 transitions. [2018-11-07 22:13:16,514 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-11-07 22:13:16,515 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 350 transitions. [2018-11-07 22:13:16,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2018-11-07 22:13:16,517 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:16,518 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 34, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:16,518 INFO L423 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:16,518 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:16,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1034000589, now seen corresponding path program 66 times [2018-11-07 22:13:16,518 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:16,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:16,519 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:13:16,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:16,519 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:16,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:17,392 INFO L134 CoverageAnalysis]: Checked inductivity of 5579 backedges. 1255 proven. 2308 refuted. 0 times theorem prover too weak. 2016 trivial. 0 not checked. [2018-11-07 22:13:17,392 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:17,392 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:17,392 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:17,393 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:17,393 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:17,393 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:17,401 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:13:17,401 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:13:17,500 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:13:17,500 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:17,507 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:17,646 INFO L134 CoverageAnalysis]: Checked inductivity of 5579 backedges. 1256 proven. 2211 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-11-07 22:13:17,646 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:18,692 INFO L134 CoverageAnalysis]: Checked inductivity of 5579 backedges. 1256 proven. 2211 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-11-07 22:13:18,712 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:18,713 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39] total 42 [2018-11-07 22:13:18,713 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:18,713 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-11-07 22:13:18,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-11-07 22:13:18,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=678, Invalid=1044, Unknown=0, NotChecked=0, Total=1722 [2018-11-07 22:13:18,714 INFO L87 Difference]: Start difference. First operand 349 states and 350 transitions. Second operand 42 states. [2018-11-07 22:13:19,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:19,227 INFO L93 Difference]: Finished difference Result 359 states and 360 transitions. [2018-11-07 22:13:19,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-11-07 22:13:19,228 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 346 [2018-11-07 22:13:19,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:19,230 INFO L225 Difference]: With dead ends: 359 [2018-11-07 22:13:19,230 INFO L226 Difference]: Without dead ends: 357 [2018-11-07 22:13:19,230 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 768 GetRequests, 657 SyntacticMatches, 69 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1432 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=691, Invalid=1201, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 22:13:19,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2018-11-07 22:13:19,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 357. [2018-11-07 22:13:19,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 357 states. [2018-11-07 22:13:19,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 357 states to 357 states and 358 transitions. [2018-11-07 22:13:19,242 INFO L78 Accepts]: Start accepts. Automaton has 357 states and 358 transitions. Word has length 346 [2018-11-07 22:13:19,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:19,242 INFO L480 AbstractCegarLoop]: Abstraction has 357 states and 358 transitions. [2018-11-07 22:13:19,243 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-11-07 22:13:19,243 INFO L276 IsEmpty]: Start isEmpty. Operand 357 states and 358 transitions. [2018-11-07 22:13:19,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 355 [2018-11-07 22:13:19,244 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:19,244 INFO L375 BasicCegarLoop]: trace histogram [35, 35, 35, 35, 35, 34, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:19,245 INFO L423 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:19,245 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:19,245 INFO L82 PathProgramCache]: Analyzing trace with hash -2013211120, now seen corresponding path program 67 times [2018-11-07 22:13:19,245 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:19,245 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:19,245 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:13:19,246 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:19,246 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:19,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:20,949 INFO L134 CoverageAnalysis]: Checked inductivity of 5848 backedges. 2414 proven. 1190 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-11-07 22:13:20,950 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:20,950 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:20,950 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:20,950 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:20,950 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:20,950 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:20,959 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:13:20,959 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:13:21,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:21,062 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:21,158 INFO L134 CoverageAnalysis]: Checked inductivity of 5848 backedges. 2414 proven. 1190 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-11-07 22:13:21,159 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:23,004 INFO L134 CoverageAnalysis]: Checked inductivity of 5848 backedges. 2414 proven. 1190 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-11-07 22:13:23,023 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:23,024 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 73 [2018-11-07 22:13:23,024 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:23,024 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-11-07 22:13:23,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-11-07 22:13:23,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1333, Invalid=3923, Unknown=0, NotChecked=0, Total=5256 [2018-11-07 22:13:23,025 INFO L87 Difference]: Start difference. First operand 357 states and 358 transitions. Second operand 73 states. [2018-11-07 22:13:24,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:24,657 INFO L93 Difference]: Finished difference Result 508 states and 544 transitions. [2018-11-07 22:13:24,657 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-11-07 22:13:24,657 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 354 [2018-11-07 22:13:24,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:24,659 INFO L225 Difference]: With dead ends: 508 [2018-11-07 22:13:24,659 INFO L226 Difference]: Without dead ends: 359 [2018-11-07 22:13:24,660 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 816 GetRequests, 639 SyntacticMatches, 70 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4199 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=2737, Invalid=9035, Unknown=0, NotChecked=0, Total=11772 [2018-11-07 22:13:24,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2018-11-07 22:13:24,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 359. [2018-11-07 22:13:24,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 359 states. [2018-11-07 22:13:24,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 360 transitions. [2018-11-07 22:13:24,673 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 360 transitions. Word has length 354 [2018-11-07 22:13:24,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:24,673 INFO L480 AbstractCegarLoop]: Abstraction has 359 states and 360 transitions. [2018-11-07 22:13:24,673 INFO L481 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-11-07 22:13:24,673 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 360 transitions. [2018-11-07 22:13:24,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 357 [2018-11-07 22:13:24,675 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:24,675 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 35, 35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:24,675 INFO L423 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:24,675 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:24,675 INFO L82 PathProgramCache]: Analyzing trace with hash 600414986, now seen corresponding path program 68 times [2018-11-07 22:13:24,676 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:24,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:24,676 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:13:24,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:24,676 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:24,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:25,377 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 1327 proven. 2446 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-11-07 22:13:25,378 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:25,378 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:25,378 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:25,378 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:25,378 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:25,378 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:25,386 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:13:25,387 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:13:25,549 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-11-07 22:13:25,549 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:25,555 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:25,691 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 1328 proven. 2346 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-11-07 22:13:25,691 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:26,768 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 1328 proven. 2346 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-11-07 22:13:26,788 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:26,789 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40, 40] total 43 [2018-11-07 22:13:26,789 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:26,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-11-07 22:13:26,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-11-07 22:13:26,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=715, Invalid=1091, Unknown=0, NotChecked=0, Total=1806 [2018-11-07 22:13:26,790 INFO L87 Difference]: Start difference. First operand 359 states and 360 transitions. Second operand 43 states. [2018-11-07 22:13:27,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:27,493 INFO L93 Difference]: Finished difference Result 369 states and 370 transitions. [2018-11-07 22:13:27,493 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-11-07 22:13:27,493 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 356 [2018-11-07 22:13:27,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:27,496 INFO L225 Difference]: With dead ends: 369 [2018-11-07 22:13:27,496 INFO L226 Difference]: Without dead ends: 367 [2018-11-07 22:13:27,496 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 790 GetRequests, 676 SyntacticMatches, 71 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1509 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=728, Invalid=1252, Unknown=0, NotChecked=0, Total=1980 [2018-11-07 22:13:27,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2018-11-07 22:13:27,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 367. [2018-11-07 22:13:27,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 367 states. [2018-11-07 22:13:27,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 368 transitions. [2018-11-07 22:13:27,508 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 368 transitions. Word has length 356 [2018-11-07 22:13:27,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:27,508 INFO L480 AbstractCegarLoop]: Abstraction has 367 states and 368 transitions. [2018-11-07 22:13:27,508 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-11-07 22:13:27,508 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 368 transitions. [2018-11-07 22:13:27,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 365 [2018-11-07 22:13:27,510 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:27,510 INFO L375 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 36, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:27,510 INFO L423 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:27,510 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:27,510 INFO L82 PathProgramCache]: Analyzing trace with hash -1554691251, now seen corresponding path program 69 times [2018-11-07 22:13:27,510 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:27,511 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:27,511 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:13:27,511 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:27,511 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:27,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:29,115 INFO L134 CoverageAnalysis]: Checked inductivity of 6195 backedges. 2555 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-11-07 22:13:29,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:29,115 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:29,115 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:29,115 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:29,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:29,115 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:29,124 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:13:29,124 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:13:29,229 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:13:29,230 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:29,236 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:29,319 INFO L134 CoverageAnalysis]: Checked inductivity of 6195 backedges. 2555 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-11-07 22:13:29,319 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:31,119 INFO L134 CoverageAnalysis]: Checked inductivity of 6195 backedges. 2555 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-11-07 22:13:31,140 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:31,140 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 75 [2018-11-07 22:13:31,140 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:31,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-11-07 22:13:31,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-11-07 22:13:31,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1407, Invalid=4143, Unknown=0, NotChecked=0, Total=5550 [2018-11-07 22:13:31,142 INFO L87 Difference]: Start difference. First operand 367 states and 368 transitions. Second operand 75 states. [2018-11-07 22:13:33,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:33,913 INFO L93 Difference]: Finished difference Result 522 states and 559 transitions. [2018-11-07 22:13:33,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-11-07 22:13:33,913 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 364 [2018-11-07 22:13:33,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:33,915 INFO L225 Difference]: With dead ends: 522 [2018-11-07 22:13:33,915 INFO L226 Difference]: Without dead ends: 369 [2018-11-07 22:13:33,916 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 839 GetRequests, 657 SyntacticMatches, 72 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4445 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=2887, Invalid=9545, Unknown=0, NotChecked=0, Total=12432 [2018-11-07 22:13:33,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2018-11-07 22:13:33,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 369. [2018-11-07 22:13:33,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 369 states. [2018-11-07 22:13:33,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 369 states to 369 states and 370 transitions. [2018-11-07 22:13:33,934 INFO L78 Accepts]: Start accepts. Automaton has 369 states and 370 transitions. Word has length 364 [2018-11-07 22:13:33,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:33,935 INFO L480 AbstractCegarLoop]: Abstraction has 369 states and 370 transitions. [2018-11-07 22:13:33,935 INFO L481 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-11-07 22:13:33,935 INFO L276 IsEmpty]: Start isEmpty. Operand 369 states and 370 transitions. [2018-11-07 22:13:33,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 367 [2018-11-07 22:13:33,937 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:33,937 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 36, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:33,938 INFO L423 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:33,938 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:33,938 INFO L82 PathProgramCache]: Analyzing trace with hash -1521508409, now seen corresponding path program 70 times [2018-11-07 22:13:33,938 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:33,939 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:33,939 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:13:33,939 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:33,939 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:33,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:34,723 INFO L134 CoverageAnalysis]: Checked inductivity of 6267 backedges. 1401 proven. 2588 refuted. 0 times theorem prover too weak. 2278 trivial. 0 not checked. [2018-11-07 22:13:34,723 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:34,724 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:34,724 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:34,724 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:34,724 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:34,724 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:34,732 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:13:34,732 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:13:34,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:34,842 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:34,989 INFO L134 CoverageAnalysis]: Checked inductivity of 6267 backedges. 1402 proven. 2485 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-11-07 22:13:34,989 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:36,092 INFO L134 CoverageAnalysis]: Checked inductivity of 6267 backedges. 1402 proven. 2485 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-11-07 22:13:36,113 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:36,113 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 44 [2018-11-07 22:13:36,114 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:36,114 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-11-07 22:13:36,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-11-07 22:13:36,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=753, Invalid=1139, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 22:13:36,115 INFO L87 Difference]: Start difference. First operand 369 states and 370 transitions. Second operand 44 states. [2018-11-07 22:13:36,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:36,712 INFO L93 Difference]: Finished difference Result 379 states and 380 transitions. [2018-11-07 22:13:36,713 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-11-07 22:13:36,713 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 366 [2018-11-07 22:13:36,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:36,715 INFO L225 Difference]: With dead ends: 379 [2018-11-07 22:13:36,715 INFO L226 Difference]: Without dead ends: 377 [2018-11-07 22:13:36,715 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 812 GetRequests, 695 SyntacticMatches, 73 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1588 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=766, Invalid=1304, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 22:13:36,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2018-11-07 22:13:36,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 377. [2018-11-07 22:13:36,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 377 states. [2018-11-07 22:13:36,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 378 transitions. [2018-11-07 22:13:36,731 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 378 transitions. Word has length 366 [2018-11-07 22:13:36,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:36,731 INFO L480 AbstractCegarLoop]: Abstraction has 377 states and 378 transitions. [2018-11-07 22:13:36,732 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-11-07 22:13:36,732 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 378 transitions. [2018-11-07 22:13:36,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2018-11-07 22:13:36,733 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:36,733 INFO L375 BasicCegarLoop]: trace histogram [37, 37, 37, 37, 37, 36, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:36,733 INFO L423 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:36,734 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:36,734 INFO L82 PathProgramCache]: Analyzing trace with hash -954383606, now seen corresponding path program 71 times [2018-11-07 22:13:36,734 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:36,734 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:36,734 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:13:36,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:36,735 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:36,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:38,701 INFO L134 CoverageAnalysis]: Checked inductivity of 6552 backedges. 2700 proven. 1332 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-11-07 22:13:38,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:38,702 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:38,702 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:38,702 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:38,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:38,702 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:38,711 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:13:38,711 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:13:38,858 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2018-11-07 22:13:38,859 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:38,865 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:38,970 INFO L134 CoverageAnalysis]: Checked inductivity of 6552 backedges. 2700 proven. 1332 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-11-07 22:13:38,970 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:40,608 INFO L134 CoverageAnalysis]: Checked inductivity of 6552 backedges. 2700 proven. 1332 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-11-07 22:13:40,628 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:40,628 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 77 [2018-11-07 22:13:40,628 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:40,629 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-11-07 22:13:40,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-11-07 22:13:40,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4369, Unknown=0, NotChecked=0, Total=5852 [2018-11-07 22:13:40,630 INFO L87 Difference]: Start difference. First operand 377 states and 378 transitions. Second operand 77 states. [2018-11-07 22:13:43,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:43,503 INFO L93 Difference]: Finished difference Result 536 states and 574 transitions. [2018-11-07 22:13:43,503 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-11-07 22:13:43,504 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 374 [2018-11-07 22:13:43,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:43,505 INFO L225 Difference]: With dead ends: 536 [2018-11-07 22:13:43,505 INFO L226 Difference]: Without dead ends: 379 [2018-11-07 22:13:43,506 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 862 GetRequests, 675 SyntacticMatches, 74 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4698 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3041, Invalid=10069, Unknown=0, NotChecked=0, Total=13110 [2018-11-07 22:13:43,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2018-11-07 22:13:43,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 379. [2018-11-07 22:13:43,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 379 states. [2018-11-07 22:13:43,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 380 transitions. [2018-11-07 22:13:43,519 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 380 transitions. Word has length 374 [2018-11-07 22:13:43,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:43,520 INFO L480 AbstractCegarLoop]: Abstraction has 379 states and 380 transitions. [2018-11-07 22:13:43,520 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-11-07 22:13:43,520 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 380 transitions. [2018-11-07 22:13:43,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 377 [2018-11-07 22:13:43,521 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:43,522 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 37, 37, 37, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:43,522 INFO L423 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:43,522 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:43,522 INFO L82 PathProgramCache]: Analyzing trace with hash 406570756, now seen corresponding path program 72 times [2018-11-07 22:13:43,522 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:43,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:43,523 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:13:43,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:43,523 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:43,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:44,286 INFO L134 CoverageAnalysis]: Checked inductivity of 6626 backedges. 1477 proven. 2734 refuted. 0 times theorem prover too weak. 2415 trivial. 0 not checked. [2018-11-07 22:13:44,287 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:44,287 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:44,287 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:44,287 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:44,287 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:44,287 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:44,295 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:13:44,296 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:13:44,407 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:13:44,407 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:44,414 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:44,571 INFO L134 CoverageAnalysis]: Checked inductivity of 6626 backedges. 1478 proven. 2628 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-11-07 22:13:44,571 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:45,781 INFO L134 CoverageAnalysis]: Checked inductivity of 6626 backedges. 1478 proven. 2628 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-11-07 22:13:45,803 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:45,803 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 45 [2018-11-07 22:13:45,803 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:45,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-11-07 22:13:45,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-11-07 22:13:45,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=792, Invalid=1188, Unknown=0, NotChecked=0, Total=1980 [2018-11-07 22:13:45,804 INFO L87 Difference]: Start difference. First operand 379 states and 380 transitions. Second operand 45 states. [2018-11-07 22:13:46,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:46,279 INFO L93 Difference]: Finished difference Result 389 states and 390 transitions. [2018-11-07 22:13:46,279 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-11-07 22:13:46,280 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 376 [2018-11-07 22:13:46,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:46,282 INFO L225 Difference]: With dead ends: 389 [2018-11-07 22:13:46,282 INFO L226 Difference]: Without dead ends: 387 [2018-11-07 22:13:46,283 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 834 GetRequests, 714 SyntacticMatches, 75 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1669 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=805, Invalid=1357, Unknown=0, NotChecked=0, Total=2162 [2018-11-07 22:13:46,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2018-11-07 22:13:46,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 387. [2018-11-07 22:13:46,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 387 states. [2018-11-07 22:13:46,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 388 transitions. [2018-11-07 22:13:46,295 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 388 transitions. Word has length 376 [2018-11-07 22:13:46,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:46,295 INFO L480 AbstractCegarLoop]: Abstraction has 387 states and 388 transitions. [2018-11-07 22:13:46,295 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-11-07 22:13:46,296 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 388 transitions. [2018-11-07 22:13:46,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 385 [2018-11-07 22:13:46,297 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:46,297 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 38, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:46,298 INFO L423 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:46,298 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:46,298 INFO L82 PathProgramCache]: Analyzing trace with hash 1329651015, now seen corresponding path program 73 times [2018-11-07 22:13:46,298 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:46,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:46,299 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:13:46,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:46,299 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:46,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:48,383 INFO L134 CoverageAnalysis]: Checked inductivity of 6919 backedges. 2849 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-11-07 22:13:48,383 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:48,383 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:48,384 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:48,384 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:48,384 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:48,384 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:48,392 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:13:48,392 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:13:48,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:48,508 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:48,600 INFO L134 CoverageAnalysis]: Checked inductivity of 6919 backedges. 2849 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-11-07 22:13:48,600 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:50,314 INFO L134 CoverageAnalysis]: Checked inductivity of 6919 backedges. 2849 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-11-07 22:13:50,334 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:50,334 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 79 [2018-11-07 22:13:50,334 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:50,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-11-07 22:13:50,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-11-07 22:13:50,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1561, Invalid=4601, Unknown=0, NotChecked=0, Total=6162 [2018-11-07 22:13:50,336 INFO L87 Difference]: Start difference. First operand 387 states and 388 transitions. Second operand 79 states. [2018-11-07 22:13:53,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:53,327 INFO L93 Difference]: Finished difference Result 550 states and 589 transitions. [2018-11-07 22:13:53,335 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-11-07 22:13:53,335 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 384 [2018-11-07 22:13:53,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:53,337 INFO L225 Difference]: With dead ends: 550 [2018-11-07 22:13:53,337 INFO L226 Difference]: Without dead ends: 389 [2018-11-07 22:13:53,339 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 885 GetRequests, 693 SyntacticMatches, 76 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4958 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3199, Invalid=10607, Unknown=0, NotChecked=0, Total=13806 [2018-11-07 22:13:53,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2018-11-07 22:13:53,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 389. [2018-11-07 22:13:53,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 389 states. [2018-11-07 22:13:53,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 389 states to 389 states and 390 transitions. [2018-11-07 22:13:53,358 INFO L78 Accepts]: Start accepts. Automaton has 389 states and 390 transitions. Word has length 384 [2018-11-07 22:13:53,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:53,358 INFO L480 AbstractCegarLoop]: Abstraction has 389 states and 390 transitions. [2018-11-07 22:13:53,358 INFO L481 AbstractCegarLoop]: Interpolant automaton has 79 states. [2018-11-07 22:13:53,358 INFO L276 IsEmpty]: Start isEmpty. Operand 389 states and 390 transitions. [2018-11-07 22:13:53,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2018-11-07 22:13:53,360 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:53,361 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 38, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:53,361 INFO L423 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:53,361 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:53,361 INFO L82 PathProgramCache]: Analyzing trace with hash -1045548863, now seen corresponding path program 74 times [2018-11-07 22:13:53,361 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:53,362 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:53,362 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:13:53,362 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:53,362 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:53,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:54,175 INFO L134 CoverageAnalysis]: Checked inductivity of 6995 backedges. 1555 proven. 2884 refuted. 0 times theorem prover too weak. 2556 trivial. 0 not checked. [2018-11-07 22:13:54,175 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:54,175 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:54,175 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:54,175 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:54,175 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:54,175 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:54,184 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:13:54,184 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:13:54,357 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-11-07 22:13:54,358 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:54,363 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:54,507 INFO L134 CoverageAnalysis]: Checked inductivity of 6995 backedges. 1556 proven. 2775 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-11-07 22:13:54,507 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:55,761 INFO L134 CoverageAnalysis]: Checked inductivity of 6995 backedges. 1556 proven. 2775 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-11-07 22:13:55,781 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:55,782 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43, 43] total 46 [2018-11-07 22:13:55,782 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:55,782 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-11-07 22:13:55,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-11-07 22:13:55,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=832, Invalid=1238, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 22:13:55,783 INFO L87 Difference]: Start difference. First operand 389 states and 390 transitions. Second operand 46 states. [2018-11-07 22:13:56,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:56,387 INFO L93 Difference]: Finished difference Result 399 states and 400 transitions. [2018-11-07 22:13:56,387 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-11-07 22:13:56,387 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 386 [2018-11-07 22:13:56,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:56,390 INFO L225 Difference]: With dead ends: 399 [2018-11-07 22:13:56,390 INFO L226 Difference]: Without dead ends: 397 [2018-11-07 22:13:56,390 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 856 GetRequests, 733 SyntacticMatches, 77 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1752 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=845, Invalid=1411, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 22:13:56,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2018-11-07 22:13:56,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 397. [2018-11-07 22:13:56,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 397 states. [2018-11-07 22:13:56,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 398 transitions. [2018-11-07 22:13:56,403 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 398 transitions. Word has length 386 [2018-11-07 22:13:56,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:56,404 INFO L480 AbstractCegarLoop]: Abstraction has 397 states and 398 transitions. [2018-11-07 22:13:56,404 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-11-07 22:13:56,404 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 398 transitions. [2018-11-07 22:13:56,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 395 [2018-11-07 22:13:56,405 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:56,405 INFO L375 BasicCegarLoop]: trace histogram [39, 39, 39, 39, 39, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:56,405 INFO L423 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:56,406 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:56,406 INFO L82 PathProgramCache]: Analyzing trace with hash -289392124, now seen corresponding path program 75 times [2018-11-07 22:13:56,406 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:56,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:56,407 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:13:56,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:56,407 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:56,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:58,614 INFO L134 CoverageAnalysis]: Checked inductivity of 7296 backedges. 3002 proven. 1482 refuted. 0 times theorem prover too weak. 2812 trivial. 0 not checked. [2018-11-07 22:13:58,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:58,615 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:58,615 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:58,615 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:58,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:58,615 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:58,623 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:13:58,624 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:13:58,739 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:13:58,740 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:58,747 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:58,844 INFO L134 CoverageAnalysis]: Checked inductivity of 7296 backedges. 3002 proven. 1482 refuted. 0 times theorem prover too weak. 2812 trivial. 0 not checked. [2018-11-07 22:13:58,845 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:00,673 INFO L134 CoverageAnalysis]: Checked inductivity of 7296 backedges. 3002 proven. 1482 refuted. 0 times theorem prover too weak. 2812 trivial. 0 not checked. [2018-11-07 22:14:00,692 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:00,693 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 81 [2018-11-07 22:14:00,693 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:00,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 81 states [2018-11-07 22:14:00,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2018-11-07 22:14:00,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1641, Invalid=4839, Unknown=0, NotChecked=0, Total=6480 [2018-11-07 22:14:00,694 INFO L87 Difference]: Start difference. First operand 397 states and 398 transitions. Second operand 81 states. [2018-11-07 22:14:03,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:03,845 INFO L93 Difference]: Finished difference Result 564 states and 604 transitions. [2018-11-07 22:14:03,846 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-11-07 22:14:03,846 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 394 [2018-11-07 22:14:03,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:03,848 INFO L225 Difference]: With dead ends: 564 [2018-11-07 22:14:03,848 INFO L226 Difference]: Without dead ends: 399 [2018-11-07 22:14:03,850 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 908 GetRequests, 711 SyntacticMatches, 78 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5225 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=3361, Invalid=11159, Unknown=0, NotChecked=0, Total=14520 [2018-11-07 22:14:03,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2018-11-07 22:14:03,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 399. [2018-11-07 22:14:03,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 399 states. [2018-11-07 22:14:03,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 400 transitions. [2018-11-07 22:14:03,863 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 400 transitions. Word has length 394 [2018-11-07 22:14:03,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:03,863 INFO L480 AbstractCegarLoop]: Abstraction has 399 states and 400 transitions. [2018-11-07 22:14:03,863 INFO L481 AbstractCegarLoop]: Interpolant automaton has 81 states. [2018-11-07 22:14:03,863 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 400 transitions. [2018-11-07 22:14:03,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 397 [2018-11-07 22:14:03,865 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:03,865 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 39, 39, 39, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:03,865 INFO L423 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:03,866 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:03,866 INFO L82 PathProgramCache]: Analyzing trace with hash 400489726, now seen corresponding path program 76 times [2018-11-07 22:14:03,866 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:03,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:03,866 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:14:03,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:03,867 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:03,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:04,696 INFO L134 CoverageAnalysis]: Checked inductivity of 7374 backedges. 1635 proven. 3038 refuted. 0 times theorem prover too weak. 2701 trivial. 0 not checked. [2018-11-07 22:14:04,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:04,697 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:04,697 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:04,697 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:04,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:04,697 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:14:04,706 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:04,706 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:14:04,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:04,825 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:04,990 INFO L134 CoverageAnalysis]: Checked inductivity of 7374 backedges. 1636 proven. 2926 refuted. 0 times theorem prover too weak. 2812 trivial. 0 not checked. [2018-11-07 22:14:04,990 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:06,282 INFO L134 CoverageAnalysis]: Checked inductivity of 7374 backedges. 1636 proven. 2926 refuted. 0 times theorem prover too weak. 2812 trivial. 0 not checked. [2018-11-07 22:14:06,302 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:06,302 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44, 44] total 47 [2018-11-07 22:14:06,302 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:06,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-11-07 22:14:06,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-11-07 22:14:06,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=873, Invalid=1289, Unknown=0, NotChecked=0, Total=2162 [2018-11-07 22:14:06,304 INFO L87 Difference]: Start difference. First operand 399 states and 400 transitions. Second operand 47 states. [2018-11-07 22:14:06,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:06,900 INFO L93 Difference]: Finished difference Result 409 states and 410 transitions. [2018-11-07 22:14:06,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-11-07 22:14:06,901 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 396 [2018-11-07 22:14:06,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:06,903 INFO L225 Difference]: With dead ends: 409 [2018-11-07 22:14:06,904 INFO L226 Difference]: Without dead ends: 407 [2018-11-07 22:14:06,904 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 878 GetRequests, 752 SyntacticMatches, 79 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1837 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=886, Invalid=1466, Unknown=0, NotChecked=0, Total=2352 [2018-11-07 22:14:06,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 407 states. [2018-11-07 22:14:06,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 407 to 407. [2018-11-07 22:14:06,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 407 states. [2018-11-07 22:14:06,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 408 transitions. [2018-11-07 22:14:06,917 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 408 transitions. Word has length 396 [2018-11-07 22:14:06,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:06,918 INFO L480 AbstractCegarLoop]: Abstraction has 407 states and 408 transitions. [2018-11-07 22:14:06,918 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-11-07 22:14:06,918 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 408 transitions. [2018-11-07 22:14:06,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 405 [2018-11-07 22:14:06,920 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:06,920 INFO L375 BasicCegarLoop]: trace histogram [40, 40, 40, 40, 40, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:06,920 INFO L423 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:06,920 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:06,920 INFO L82 PathProgramCache]: Analyzing trace with hash -239896255, now seen corresponding path program 77 times [2018-11-07 22:14:06,920 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:06,921 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:06,921 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:06,921 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:06,921 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:06,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:09,234 INFO L134 CoverageAnalysis]: Checked inductivity of 7683 backedges. 3159 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2018-11-07 22:14:09,234 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:09,234 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:09,234 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:09,234 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:09,234 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:09,235 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:14:09,242 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:14:09,242 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:14:09,412 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-11-07 22:14:09,412 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:14:09,419 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:09,511 INFO L134 CoverageAnalysis]: Checked inductivity of 7683 backedges. 3159 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2018-11-07 22:14:09,511 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:11,431 INFO L134 CoverageAnalysis]: Checked inductivity of 7683 backedges. 3159 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2018-11-07 22:14:11,451 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:11,452 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 83 [2018-11-07 22:14:11,452 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:11,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-11-07 22:14:11,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-11-07 22:14:11,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1723, Invalid=5083, Unknown=0, NotChecked=0, Total=6806 [2018-11-07 22:14:11,453 INFO L87 Difference]: Start difference. First operand 407 states and 408 transitions. Second operand 83 states. [2018-11-07 22:14:14,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:14,985 INFO L93 Difference]: Finished difference Result 578 states and 619 transitions. [2018-11-07 22:14:14,985 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-11-07 22:14:14,985 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 404 [2018-11-07 22:14:14,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:14,987 INFO L225 Difference]: With dead ends: 578 [2018-11-07 22:14:14,987 INFO L226 Difference]: Without dead ends: 409 [2018-11-07 22:14:14,989 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 931 GetRequests, 729 SyntacticMatches, 80 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5499 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=3527, Invalid=11725, Unknown=0, NotChecked=0, Total=15252 [2018-11-07 22:14:14,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 409 states. [2018-11-07 22:14:15,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 409 to 409. [2018-11-07 22:14:15,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 409 states. [2018-11-07 22:14:15,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 410 transitions. [2018-11-07 22:14:15,006 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 410 transitions. Word has length 404 [2018-11-07 22:14:15,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:15,006 INFO L480 AbstractCegarLoop]: Abstraction has 409 states and 410 transitions. [2018-11-07 22:14:15,007 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-11-07 22:14:15,007 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 410 transitions. [2018-11-07 22:14:15,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 407 [2018-11-07 22:14:15,008 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:15,009 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 40, 40, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:15,009 INFO L423 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:15,009 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:15,009 INFO L82 PathProgramCache]: Analyzing trace with hash -2078389317, now seen corresponding path program 78 times [2018-11-07 22:14:15,009 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:15,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:15,010 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:14:15,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:15,010 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:15,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:16,009 INFO L134 CoverageAnalysis]: Checked inductivity of 7763 backedges. 1717 proven. 3196 refuted. 0 times theorem prover too weak. 2850 trivial. 0 not checked. [2018-11-07 22:14:16,009 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:16,009 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:16,009 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:16,010 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:16,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:16,010 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:14:16,018 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:14:16,019 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:14:16,135 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:14:16,135 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:14:16,143 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:16,289 INFO L134 CoverageAnalysis]: Checked inductivity of 7763 backedges. 1718 proven. 3081 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2018-11-07 22:14:16,290 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:17,710 INFO L134 CoverageAnalysis]: Checked inductivity of 7763 backedges. 1718 proven. 3081 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2018-11-07 22:14:17,730 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:17,731 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45, 45] total 48 [2018-11-07 22:14:17,731 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:17,731 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-11-07 22:14:17,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-11-07 22:14:17,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=915, Invalid=1341, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 22:14:17,732 INFO L87 Difference]: Start difference. First operand 409 states and 410 transitions. Second operand 48 states. [2018-11-07 22:14:18,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:18,452 INFO L93 Difference]: Finished difference Result 419 states and 420 transitions. [2018-11-07 22:14:18,452 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-11-07 22:14:18,452 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 406 [2018-11-07 22:14:18,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:18,455 INFO L225 Difference]: With dead ends: 419 [2018-11-07 22:14:18,455 INFO L226 Difference]: Without dead ends: 417 [2018-11-07 22:14:18,456 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 900 GetRequests, 771 SyntacticMatches, 81 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1924 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=928, Invalid=1522, Unknown=0, NotChecked=0, Total=2450 [2018-11-07 22:14:18,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2018-11-07 22:14:18,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 417. [2018-11-07 22:14:18,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 417 states. [2018-11-07 22:14:18,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 417 states to 417 states and 418 transitions. [2018-11-07 22:14:18,470 INFO L78 Accepts]: Start accepts. Automaton has 417 states and 418 transitions. Word has length 406 [2018-11-07 22:14:18,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:18,470 INFO L480 AbstractCegarLoop]: Abstraction has 417 states and 418 transitions. [2018-11-07 22:14:18,470 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-11-07 22:14:18,470 INFO L276 IsEmpty]: Start isEmpty. Operand 417 states and 418 transitions. [2018-11-07 22:14:18,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 415 [2018-11-07 22:14:18,472 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:18,472 INFO L375 BasicCegarLoop]: trace histogram [41, 41, 41, 41, 41, 40, 40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:18,473 INFO L423 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:18,473 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:18,473 INFO L82 PathProgramCache]: Analyzing trace with hash -11879682, now seen corresponding path program 79 times [2018-11-07 22:14:18,473 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:18,473 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:18,474 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:14:18,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:18,474 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:18,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:20,585 INFO L134 CoverageAnalysis]: Checked inductivity of 8080 backedges. 3320 proven. 1640 refuted. 0 times theorem prover too weak. 3120 trivial. 0 not checked. [2018-11-07 22:14:20,585 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:20,585 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:20,585 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:20,585 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:20,586 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:20,586 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:14:20,594 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:20,594 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:14:20,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:20,713 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:20,819 INFO L134 CoverageAnalysis]: Checked inductivity of 8080 backedges. 3320 proven. 1640 refuted. 0 times theorem prover too weak. 3120 trivial. 0 not checked. [2018-11-07 22:14:20,820 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:22,784 INFO L134 CoverageAnalysis]: Checked inductivity of 8080 backedges. 3320 proven. 1640 refuted. 0 times theorem prover too weak. 3120 trivial. 0 not checked. [2018-11-07 22:14:22,804 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:22,804 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 85 [2018-11-07 22:14:22,804 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:22,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 85 states [2018-11-07 22:14:22,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2018-11-07 22:14:22,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1807, Invalid=5333, Unknown=0, NotChecked=0, Total=7140 [2018-11-07 22:14:22,806 INFO L87 Difference]: Start difference. First operand 417 states and 418 transitions. Second operand 85 states. [2018-11-07 22:14:26,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:26,127 INFO L93 Difference]: Finished difference Result 592 states and 634 transitions. [2018-11-07 22:14:26,128 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-11-07 22:14:26,128 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 414 [2018-11-07 22:14:26,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:26,130 INFO L225 Difference]: With dead ends: 592 [2018-11-07 22:14:26,130 INFO L226 Difference]: Without dead ends: 419 [2018-11-07 22:14:26,132 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 954 GetRequests, 747 SyntacticMatches, 82 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5780 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=3697, Invalid=12305, Unknown=0, NotChecked=0, Total=16002 [2018-11-07 22:14:26,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2018-11-07 22:14:26,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 419. [2018-11-07 22:14:26,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 419 states. [2018-11-07 22:14:26,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 419 states to 419 states and 420 transitions. [2018-11-07 22:14:26,147 INFO L78 Accepts]: Start accepts. Automaton has 419 states and 420 transitions. Word has length 414 [2018-11-07 22:14:26,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:26,147 INFO L480 AbstractCegarLoop]: Abstraction has 419 states and 420 transitions. [2018-11-07 22:14:26,147 INFO L481 AbstractCegarLoop]: Interpolant automaton has 85 states. [2018-11-07 22:14:26,147 INFO L276 IsEmpty]: Start isEmpty. Operand 419 states and 420 transitions. [2018-11-07 22:14:26,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 417 [2018-11-07 22:14:26,149 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:26,149 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 41, 41, 41, 40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:26,149 INFO L423 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:26,149 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:26,150 INFO L82 PathProgramCache]: Analyzing trace with hash -1529594632, now seen corresponding path program 80 times [2018-11-07 22:14:26,150 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:26,150 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:26,150 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:26,150 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:26,150 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:26,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:27,059 INFO L134 CoverageAnalysis]: Checked inductivity of 8162 backedges. 1801 proven. 3358 refuted. 0 times theorem prover too weak. 3003 trivial. 0 not checked. [2018-11-07 22:14:27,059 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:27,060 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:27,060 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:27,060 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:27,060 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:27,060 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:14:27,069 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:14:27,069 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:14:27,249 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-11-07 22:14:27,250 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:14:27,257 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:27,425 INFO L134 CoverageAnalysis]: Checked inductivity of 8162 backedges. 1802 proven. 3240 refuted. 0 times theorem prover too weak. 3120 trivial. 0 not checked. [2018-11-07 22:14:27,425 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:29,075 INFO L134 CoverageAnalysis]: Checked inductivity of 8162 backedges. 1802 proven. 3240 refuted. 0 times theorem prover too weak. 3120 trivial. 0 not checked. [2018-11-07 22:14:29,097 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:29,097 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 49 [2018-11-07 22:14:29,098 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:29,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-11-07 22:14:29,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-11-07 22:14:29,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=958, Invalid=1394, Unknown=0, NotChecked=0, Total=2352 [2018-11-07 22:14:29,099 INFO L87 Difference]: Start difference. First operand 419 states and 420 transitions. Second operand 49 states. [2018-11-07 22:14:29,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:29,717 INFO L93 Difference]: Finished difference Result 429 states and 430 transitions. [2018-11-07 22:14:29,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-11-07 22:14:29,717 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 416 [2018-11-07 22:14:29,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:29,720 INFO L225 Difference]: With dead ends: 429 [2018-11-07 22:14:29,720 INFO L226 Difference]: Without dead ends: 427 [2018-11-07 22:14:29,720 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 922 GetRequests, 790 SyntacticMatches, 83 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2013 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=971, Invalid=1579, Unknown=0, NotChecked=0, Total=2550 [2018-11-07 22:14:29,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 427 states. [2018-11-07 22:14:29,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 427 to 427. [2018-11-07 22:14:29,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 427 states. [2018-11-07 22:14:29,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 427 states to 427 states and 428 transitions. [2018-11-07 22:14:29,733 INFO L78 Accepts]: Start accepts. Automaton has 427 states and 428 transitions. Word has length 416 [2018-11-07 22:14:29,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:29,734 INFO L480 AbstractCegarLoop]: Abstraction has 427 states and 428 transitions. [2018-11-07 22:14:29,734 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-11-07 22:14:29,734 INFO L276 IsEmpty]: Start isEmpty. Operand 427 states and 428 transitions. [2018-11-07 22:14:29,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 425 [2018-11-07 22:14:29,736 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:29,736 INFO L375 BasicCegarLoop]: trace histogram [42, 42, 42, 42, 42, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:29,736 INFO L423 AbstractCegarLoop]: === Iteration 84 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:29,736 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:29,736 INFO L82 PathProgramCache]: Analyzing trace with hash 1540235067, now seen corresponding path program 81 times [2018-11-07 22:14:29,736 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:29,737 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:29,737 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:14:29,737 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:29,737 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:29,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:31,869 INFO L134 CoverageAnalysis]: Checked inductivity of 8487 backedges. 3485 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2018-11-07 22:14:31,869 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:31,870 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:31,870 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:31,870 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:31,870 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:31,870 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:14:31,878 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:14:31,878 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:14:32,001 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:14:32,001 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:14:32,009 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:32,127 INFO L134 CoverageAnalysis]: Checked inductivity of 8487 backedges. 3485 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2018-11-07 22:14:32,127 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:34,557 INFO L134 CoverageAnalysis]: Checked inductivity of 8487 backedges. 3485 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2018-11-07 22:14:34,577 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:34,577 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 87 [2018-11-07 22:14:34,577 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:34,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-11-07 22:14:34,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-11-07 22:14:34,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1893, Invalid=5589, Unknown=0, NotChecked=0, Total=7482 [2018-11-07 22:14:34,579 INFO L87 Difference]: Start difference. First operand 427 states and 428 transitions. Second operand 87 states. Received shutdown request... [2018-11-07 22:14:36,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2018-11-07 22:14:36,934 WARN L549 AbstractCegarLoop]: Verification canceled [2018-11-07 22:14:36,940 WARN L205 ceAbstractionStarter]: Timeout [2018-11-07 22:14:36,940 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 10:14:36 BoogieIcfgContainer [2018-11-07 22:14:36,940 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-07 22:14:36,941 INFO L168 Benchmark]: Toolchain (without parser) took 228943.81 ms. Allocated memory was 1.5 GB in the beginning and 2.5 GB in the end (delta: 939.5 MB). Free memory was 1.4 GB in the beginning and 1.6 GB in the end (delta: -145.5 MB). Peak memory consumption was 794.0 MB. Max. memory is 7.1 GB. [2018-11-07 22:14:36,942 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 22:14:36,942 INFO L168 Benchmark]: CACSL2BoogieTranslator took 320.38 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-11-07 22:14:36,942 INFO L168 Benchmark]: Boogie Procedure Inliner took 25.96 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 22:14:36,943 INFO L168 Benchmark]: Boogie Preprocessor took 26.90 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 22:14:36,943 INFO L168 Benchmark]: RCFGBuilder took 364.97 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 733.0 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -783.3 MB). Peak memory consumption was 26.3 MB. Max. memory is 7.1 GB. [2018-11-07 22:14:36,944 INFO L168 Benchmark]: TraceAbstraction took 228200.88 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 206.6 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 627.2 MB). Peak memory consumption was 833.8 MB. Max. memory is 7.1 GB. [2018-11-07 22:14:36,946 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 320.38 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 25.96 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 26.90 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 364.97 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 733.0 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -783.3 MB). Peak memory consumption was 26.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 228200.88 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 206.6 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 627.2 MB). Peak memory consumption was 833.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was constructing difference of abstraction (427states) and FLOYD_HOARE automaton (currently 74 states, 87 states before enhancement),while ReachableStatesComputation was computing reachable states (322 states constructedinput type IntersectNwa). - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 23 locations, 1 error locations. TIMEOUT Result, 228.1s OverallTime, 84 OverallIterations, 42 TraceHistogramMax, 75.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 4511 SDtfs, 3612 SDslu, 45750 SDs, 0 SdLazy, 58903 SolverSat, 4284 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 37.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 40920 GetRequests, 33391 SyntacticMatches, 3564 SemanticMatches, 3965 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118045 ImplicationChecksByTransitivity, 149.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=427occurred in iteration=83, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.8s AutomataMinimizationTime, 83 MinimizatonAttempts, 5 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 1.0s SsaConstructionTime, 6.3s SatisfiabilityAnalysisTime, 138.1s InterpolantComputationTime, 36091 NumberOfCodeBlocks, 36091 NumberOfCodeBlocksAsserted, 766 NumberOfCheckSat, 53869 ConstructedInterpolants, 0 QuantifiedInterpolants, 33546233 SizeOfPredicates, 244 NumberOfNonLiveVariables, 38214 ConjunctsInSsa, 3846 ConjunctsInUnsatCore, 246 InterpolantComputations, 3 PerfectInterpolantSequences, 492937/704663 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown