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-new/count_by_2_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 22:14:54,488 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 22:14:54,490 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 22:14:54,503 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 22:14:54,503 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 22:14:54,504 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 22:14:54,505 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 22:14:54,507 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 22:14:54,509 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 22:14:54,510 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 22:14:54,511 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 22:14:54,511 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 22:14:54,512 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 22:14:54,513 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 22:14:54,514 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 22:14:54,515 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 22:14:54,515 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 22:14:54,517 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 22:14:54,519 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 22:14:54,521 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 22:14:54,522 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 22:14:54,523 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 22:14:54,525 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 22:14:54,525 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 22:14:54,525 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 22:14:54,526 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 22:14:54,527 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 22:14:54,528 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 22:14:54,529 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 22:14:54,530 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 22:14:54,530 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 22:14:54,531 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-07 22:14:54,531 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-07 22:14:54,531 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-07 22:14:54,532 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-07 22:14:54,533 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-07 22:14:54,533 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 22:14:54,553 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 22:14:54,554 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 22:14:54,554 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 22:14:54,557 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 22:14:54,558 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 22:14:54,558 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 22:14:54,558 INFO L133 SettingsManager]: * Maximum recursion depth of evaluation operations=6 [2018-11-07 22:14:54,558 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 22:14:54,558 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 22:14:54,559 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 22:14:54,559 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 22:14:54,559 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 22:14:54,559 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 22:14:54,560 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 22:14:54,561 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 22:14:54,561 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 22:14:54,561 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 22:14:54,562 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 22:14:54,562 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 22:14:54,562 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 22:14:54,562 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 22:14:54,564 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 22:14:54,564 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 22:14:54,564 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 22:14:54,564 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 22:14:54,564 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 22:14:54,565 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 22:14:54,565 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 22:14:54,565 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 22:14:54,565 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 22:14:54,565 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 22:14:54,566 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 22:14:54,566 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 22:14:54,566 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 22:14:54,566 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 22:14:54,636 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 22:14:54,653 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 22:14:54,658 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 22:14:54,660 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 22:14:54,661 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 22:14:54,661 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/count_by_2_true-unreach-call_true-termination.i [2018-11-07 22:14:54,729 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/eb4bfc1f9/56aa9ddc77214fd0afea2275eaa35960/FLAG6cf3e81be [2018-11-07 22:14:55,198 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 22:14:55,199 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_2_true-unreach-call_true-termination.i [2018-11-07 22:14:55,205 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/eb4bfc1f9/56aa9ddc77214fd0afea2275eaa35960/FLAG6cf3e81be [2018-11-07 22:14:55,222 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/eb4bfc1f9/56aa9ddc77214fd0afea2275eaa35960 [2018-11-07 22:14:55,233 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 22:14:55,235 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 22:14:55,238 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 22:14:55,238 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 22:14:55,243 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 22:14:55,244 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:14:55" (1/1) ... [2018-11-07 22:14:55,247 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@21253a37 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:55, skipping insertion in model container [2018-11-07 22:14:55,248 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:14:55" (1/1) ... [2018-11-07 22:14:55,258 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 22:14:55,284 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 22:14:55,506 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:14:55,511 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 22:14:55,530 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:14:55,548 INFO L193 MainTranslator]: Completed translation [2018-11-07 22:14:55,549 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:55 WrapperNode [2018-11-07 22:14:55,549 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 22:14:55,551 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 22:14:55,551 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 22:14:55,551 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 22:14:55,561 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:55" (1/1) ... [2018-11-07 22:14:55,569 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:55" (1/1) ... [2018-11-07 22:14:55,576 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 22:14:55,576 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 22:14:55,577 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 22:14:55,577 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 22:14:55,592 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:55" (1/1) ... [2018-11-07 22:14:55,592 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:55" (1/1) ... [2018-11-07 22:14:55,593 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:55" (1/1) ... [2018-11-07 22:14:55,593 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:55" (1/1) ... [2018-11-07 22:14:55,597 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:55" (1/1) ... [2018-11-07 22:14:55,605 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:55" (1/1) ... [2018-11-07 22:14:55,607 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:55" (1/1) ... [2018-11-07 22:14:55,608 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 22:14:55,609 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 22:14:55,609 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 22:14:55,609 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 22:14:55,610 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:55" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 22:14:55,766 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 22:14:55,766 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 22:14:55,766 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 22:14:55,767 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 22:14:55,767 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 22:14:55,767 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 22:14:55,768 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 22:14:55,768 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 22:14:55,962 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 22:14:55,963 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:14:55 BoogieIcfgContainer [2018-11-07 22:14:55,963 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 22:14:55,964 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 22:14:55,964 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 22:14:55,967 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 22:14:55,967 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 10:14:55" (1/3) ... [2018-11-07 22:14:55,968 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@290deb75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:14:55, skipping insertion in model container [2018-11-07 22:14:55,968 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:55" (2/3) ... [2018-11-07 22:14:55,969 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@290deb75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:14:55, skipping insertion in model container [2018-11-07 22:14:55,969 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:14:55" (3/3) ... [2018-11-07 22:14:55,971 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_2_true-unreach-call_true-termination.i [2018-11-07 22:14:55,979 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 22:14:55,986 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 22:14:56,001 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 22:14:56,034 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 22:14:56,035 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 22:14:56,035 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 22:14:56,035 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 22:14:56,035 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 22:14:56,035 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 22:14:56,036 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 22:14:56,036 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 22:14:56,056 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-11-07 22:14:56,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-07 22:14:56,063 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:56,064 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:56,066 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:56,073 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:56,073 INFO L82 PathProgramCache]: Analyzing trace with hash 563245249, now seen corresponding path program 1 times [2018-11-07 22:14:56,076 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:56,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:56,134 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:56,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:56,135 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:56,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:56,201 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 22:14:56,204 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:14:56,204 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 22:14:56,205 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:14:56,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 22:14:56,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 22:14:56,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 22:14:56,227 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2018-11-07 22:14:56,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:56,249 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2018-11-07 22:14:56,249 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 22:14:56,251 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-11-07 22:14:56,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:56,261 INFO L225 Difference]: With dead ends: 32 [2018-11-07 22:14:56,261 INFO L226 Difference]: Without dead ends: 13 [2018-11-07 22:14:56,265 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 22:14:56,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-11-07 22:14:56,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-11-07 22:14:56,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-11-07 22:14:56,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-11-07 22:14:56,314 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-11-07 22:14:56,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:56,315 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-11-07 22:14:56,315 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 22:14:56,315 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-11-07 22:14:56,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-07 22:14:56,317 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:56,317 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:56,317 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:56,319 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:56,319 INFO L82 PathProgramCache]: Analyzing trace with hash -496423, now seen corresponding path program 1 times [2018-11-07 22:14:56,319 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:56,321 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:56,322 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:56,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:56,322 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:56,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:56,378 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 22:14:56,379 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:14:56,379 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-07 22:14:56,379 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:14:56,381 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 22:14:56,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 22:14:56,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 22:14:56,382 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 3 states. [2018-11-07 22:14:56,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:56,464 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-11-07 22:14:56,465 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 22:14:56,465 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-11-07 22:14:56,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:56,466 INFO L225 Difference]: With dead ends: 21 [2018-11-07 22:14:56,467 INFO L226 Difference]: Without dead ends: 16 [2018-11-07 22:14:56,468 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 22:14:56,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-11-07 22:14:56,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-11-07 22:14:56,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-11-07 22:14:56,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-11-07 22:14:56,473 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2018-11-07 22:14:56,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:56,473 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-11-07 22:14:56,474 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 22:14:56,474 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-11-07 22:14:56,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-11-07 22:14:56,475 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:56,475 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:56,475 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:56,475 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:56,476 INFO L82 PathProgramCache]: Analyzing trace with hash -1177044387, now seen corresponding path program 1 times [2018-11-07 22:14:56,476 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:56,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:56,477 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:56,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:56,478 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:56,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:56,567 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:56,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:56,568 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:56,569 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-11-07 22:14:56,578 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [11], [13], [15], [22], [25], [27], [33], [34], [35], [37] [2018-11-07 22:14:56,611 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 22:14:56,611 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 22:14:56,767 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 22:14:56,769 INFO L272 AbstractInterpreter]: Visited 13 different actions 40 times. Merged at 4 different actions 18 times. Widened at 1 different actions 2 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-11-07 22:14:56,783 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:56,784 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 22:14:56,785 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:56,785 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 22:14:56,801 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:56,802 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:14:56,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:56,822 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:56,841 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:56,841 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:56,912 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:56,934 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:56,934 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-11-07 22:14:56,934 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:56,935 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-07 22:14:56,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-07 22:14:56,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-11-07 22:14:56,936 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 4 states. [2018-11-07 22:14:56,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:56,991 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-11-07 22:14:56,991 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-07 22:14:56,991 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-11-07 22:14:56,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:56,992 INFO L225 Difference]: With dead ends: 24 [2018-11-07 22:14:56,992 INFO L226 Difference]: Without dead ends: 19 [2018-11-07 22:14:56,993 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-11-07 22:14:56,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-11-07 22:14:56,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2018-11-07 22:14:56,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-11-07 22:14:56,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-11-07 22:14:56,998 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 14 [2018-11-07 22:14:56,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:56,999 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-11-07 22:14:56,999 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-07 22:14:57,000 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-11-07 22:14:57,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-11-07 22:14:57,000 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:57,001 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:57,001 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:57,001 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:57,001 INFO L82 PathProgramCache]: Analyzing trace with hash -489337255, now seen corresponding path program 2 times [2018-11-07 22:14:57,001 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:57,003 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:57,003 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:57,003 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:57,003 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:57,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:57,091 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:57,092 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:57,092 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:57,092 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:57,092 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:57,092 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:57,092 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 22:14:57,103 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:14:57,104 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:14:57,125 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 22:14:57,126 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:14:57,130 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:57,136 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:57,136 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:57,312 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:57,343 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:57,344 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-11-07 22:14:57,344 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:57,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-07 22:14:57,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-07 22:14:57,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-11-07 22:14:57,347 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 5 states. [2018-11-07 22:14:57,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:57,513 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-11-07 22:14:57,514 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 22:14:57,515 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-11-07 22:14:57,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:57,516 INFO L225 Difference]: With dead ends: 27 [2018-11-07 22:14:57,516 INFO L226 Difference]: Without dead ends: 22 [2018-11-07 22:14:57,518 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-11-07 22:14:57,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-11-07 22:14:57,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-11-07 22:14:57,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-07 22:14:57,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-11-07 22:14:57,526 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 17 [2018-11-07 22:14:57,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:57,527 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-11-07 22:14:57,527 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-07 22:14:57,527 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-11-07 22:14:57,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-11-07 22:14:57,529 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:57,529 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:57,530 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:57,530 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:57,530 INFO L82 PathProgramCache]: Analyzing trace with hash -169763, now seen corresponding path program 3 times [2018-11-07 22:14:57,531 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:57,532 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:57,532 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:14:57,533 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:57,533 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:57,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:57,649 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:57,650 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:57,650 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:57,650 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:57,651 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:57,651 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:57,651 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 22:14:57,664 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:14:57,665 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:14:57,691 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:14:57,691 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:14:57,693 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:57,703 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:57,704 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:57,835 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:57,855 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:57,856 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-11-07 22:14:57,856 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:57,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 22:14:57,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 22:14:57,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-11-07 22:14:57,857 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 6 states. [2018-11-07 22:14:57,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:57,899 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-11-07 22:14:57,901 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 22:14:57,902 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-11-07 22:14:57,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:57,903 INFO L225 Difference]: With dead ends: 30 [2018-11-07 22:14:57,903 INFO L226 Difference]: Without dead ends: 25 [2018-11-07 22:14:57,904 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-11-07 22:14:57,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-11-07 22:14:57,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2018-11-07 22:14:57,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-07 22:14:57,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-11-07 22:14:57,909 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 20 [2018-11-07 22:14:57,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:57,910 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-11-07 22:14:57,910 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 22:14:57,910 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-11-07 22:14:57,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-11-07 22:14:57,911 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:57,911 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:57,912 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:57,912 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:57,912 INFO L82 PathProgramCache]: Analyzing trace with hash -35450919, now seen corresponding path program 4 times [2018-11-07 22:14:57,912 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:57,913 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:57,913 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:14:57,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:57,914 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:57,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:58,106 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:58,107 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:58,107 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:58,107 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:58,107 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:58,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:58,108 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 22:14:58,119 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:58,119 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:14:58,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:58,139 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:58,147 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:58,147 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:58,269 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:58,295 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:58,295 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-11-07 22:14:58,295 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:58,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-07 22:14:58,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-07 22:14:58,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-11-07 22:14:58,296 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 7 states. [2018-11-07 22:14:58,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:58,463 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-11-07 22:14:58,463 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-07 22:14:58,463 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-11-07 22:14:58,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:58,465 INFO L225 Difference]: With dead ends: 33 [2018-11-07 22:14:58,465 INFO L226 Difference]: Without dead ends: 28 [2018-11-07 22:14:58,465 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-11-07 22:14:58,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-11-07 22:14:58,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2018-11-07 22:14:58,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-11-07 22:14:58,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-11-07 22:14:58,471 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 23 [2018-11-07 22:14:58,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:58,471 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-11-07 22:14:58,472 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-07 22:14:58,472 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-11-07 22:14:58,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-11-07 22:14:58,473 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:58,473 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:58,473 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:58,474 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:58,474 INFO L82 PathProgramCache]: Analyzing trace with hash 1170618205, now seen corresponding path program 5 times [2018-11-07 22:14:58,474 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:58,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:58,475 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:58,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:58,476 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:58,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:58,799 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:58,799 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:58,799 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:58,800 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:58,800 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:58,800 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:58,800 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 22:14:58,812 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:14:58,812 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:14:58,824 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 22:14:58,825 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:14:58,828 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:58,839 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:58,839 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:59,025 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:59,054 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:59,055 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-11-07 22:14:59,055 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:59,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-07 22:14:59,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-07 22:14:59,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-11-07 22:14:59,056 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 8 states. [2018-11-07 22:14:59,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:59,102 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-11-07 22:14:59,103 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-07 22:14:59,103 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-11-07 22:14:59,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:59,104 INFO L225 Difference]: With dead ends: 36 [2018-11-07 22:14:59,105 INFO L226 Difference]: Without dead ends: 31 [2018-11-07 22:14:59,105 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-11-07 22:14:59,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-11-07 22:14:59,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2018-11-07 22:14:59,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-07 22:14:59,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-11-07 22:14:59,111 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 26 [2018-11-07 22:14:59,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:59,111 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-11-07 22:14:59,111 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-07 22:14:59,112 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-11-07 22:14:59,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-11-07 22:14:59,112 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:59,113 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:59,113 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:59,113 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:59,113 INFO L82 PathProgramCache]: Analyzing trace with hash -520507047, now seen corresponding path program 6 times [2018-11-07 22:14:59,113 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:59,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:59,114 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:14:59,115 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:59,115 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:59,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:59,270 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:59,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:59,271 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:59,271 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:59,271 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:59,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:59,272 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 22:14:59,280 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:14:59,281 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:14:59,291 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:14:59,291 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:14:59,294 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:59,302 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:59,303 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:59,475 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:59,495 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:59,495 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-11-07 22:14:59,495 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:59,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 22:14:59,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 22:14:59,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-11-07 22:14:59,497 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 9 states. [2018-11-07 22:14:59,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:59,584 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-11-07 22:14:59,585 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-07 22:14:59,585 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-11-07 22:14:59,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:59,586 INFO L225 Difference]: With dead ends: 39 [2018-11-07 22:14:59,586 INFO L226 Difference]: Without dead ends: 34 [2018-11-07 22:14:59,587 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-11-07 22:14:59,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-11-07 22:14:59,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-11-07 22:14:59,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-11-07 22:14:59,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-11-07 22:14:59,592 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 29 [2018-11-07 22:14:59,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:59,592 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-11-07 22:14:59,592 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 22:14:59,593 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-11-07 22:14:59,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-11-07 22:14:59,593 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:59,594 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:59,594 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:59,594 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:59,594 INFO L82 PathProgramCache]: Analyzing trace with hash -866507299, now seen corresponding path program 7 times [2018-11-07 22:14:59,594 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:59,595 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:59,595 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:14:59,595 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:59,596 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:59,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:59,783 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:59,784 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:59,784 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:59,784 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:59,785 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:59,785 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:59,785 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 22:14:59,797 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:59,798 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:14:59,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:59,812 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:59,821 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:59,822 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:00,018 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:00,038 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:00,038 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-11-07 22:15:00,038 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:00,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 22:15:00,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 22:15:00,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-11-07 22:15:00,040 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 10 states. [2018-11-07 22:15:00,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:00,095 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-11-07 22:15:00,097 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 22:15:00,097 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-11-07 22:15:00,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:00,098 INFO L225 Difference]: With dead ends: 42 [2018-11-07 22:15:00,098 INFO L226 Difference]: Without dead ends: 37 [2018-11-07 22:15:00,099 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-11-07 22:15:00,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-11-07 22:15:00,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2018-11-07 22:15:00,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-11-07 22:15:00,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-11-07 22:15:00,105 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 32 [2018-11-07 22:15:00,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:00,105 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-11-07 22:15:00,105 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 22:15:00,106 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-11-07 22:15:00,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-11-07 22:15:00,107 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:00,107 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:00,107 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:00,107 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:00,107 INFO L82 PathProgramCache]: Analyzing trace with hash -638504231, now seen corresponding path program 8 times [2018-11-07 22:15:00,108 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:00,108 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:00,109 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:00,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:00,109 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:00,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:00,294 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:00,295 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:00,295 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:00,295 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:00,296 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:00,296 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:00,296 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 22:15:00,307 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:15:00,307 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:15:00,318 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 22:15:00,319 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:00,323 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:00,336 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:00,336 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:00,559 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:00,579 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:00,580 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-11-07 22:15:00,580 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:00,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-07 22:15:00,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-07 22:15:00,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-11-07 22:15:00,582 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 11 states. [2018-11-07 22:15:00,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:00,725 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-11-07 22:15:00,728 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 22:15:00,728 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-11-07 22:15:00,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:00,729 INFO L225 Difference]: With dead ends: 45 [2018-11-07 22:15:00,729 INFO L226 Difference]: Without dead ends: 40 [2018-11-07 22:15:00,730 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-11-07 22:15:00,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-11-07 22:15:00,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2018-11-07 22:15:00,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-11-07 22:15:00,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-11-07 22:15:00,735 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 35 [2018-11-07 22:15:00,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:00,736 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-11-07 22:15:00,736 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-07 22:15:00,736 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-11-07 22:15:00,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-11-07 22:15:00,737 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:00,737 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:00,737 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:00,737 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:00,738 INFO L82 PathProgramCache]: Analyzing trace with hash 1457599581, now seen corresponding path program 9 times [2018-11-07 22:15:00,738 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:00,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:00,739 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:00,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:00,739 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:00,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:00,894 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:00,895 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:00,895 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:00,895 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:00,895 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:00,895 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:00,896 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 22:15:00,904 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:15:00,904 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:15:00,915 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:15:00,915 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:00,918 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:00,928 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:00,929 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:01,200 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:01,221 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:01,221 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-11-07 22:15:01,221 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:01,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-07 22:15:01,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-07 22:15:01,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-11-07 22:15:01,223 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 12 states. [2018-11-07 22:15:01,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:01,270 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-11-07 22:15:01,271 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-07 22:15:01,271 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-11-07 22:15:01,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:01,273 INFO L225 Difference]: With dead ends: 48 [2018-11-07 22:15:01,273 INFO L226 Difference]: Without dead ends: 43 [2018-11-07 22:15:01,274 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-11-07 22:15:01,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-11-07 22:15:01,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2018-11-07 22:15:01,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-11-07 22:15:01,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-11-07 22:15:01,279 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 38 [2018-11-07 22:15:01,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:01,279 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-11-07 22:15:01,280 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-07 22:15:01,280 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-11-07 22:15:01,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-11-07 22:15:01,281 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:01,281 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:01,281 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:01,281 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:01,281 INFO L82 PathProgramCache]: Analyzing trace with hash 1956746329, now seen corresponding path program 10 times [2018-11-07 22:15:01,282 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:01,282 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:01,283 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:01,283 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:01,283 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:01,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:01,432 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:01,432 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:01,432 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:01,433 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:01,433 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:01,433 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:01,433 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 22:15:01,442 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:01,442 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:15:01,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:01,461 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:01,472 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:01,472 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:01,936 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:01,956 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:01,957 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-11-07 22:15:01,957 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:01,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 22:15:01,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 22:15:01,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:15:01,958 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 13 states. [2018-11-07 22:15:02,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:02,015 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-11-07 22:15:02,016 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 22:15:02,016 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-11-07 22:15:02,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:02,017 INFO L225 Difference]: With dead ends: 51 [2018-11-07 22:15:02,018 INFO L226 Difference]: Without dead ends: 46 [2018-11-07 22:15:02,019 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:15:02,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-11-07 22:15:02,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2018-11-07 22:15:02,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-11-07 22:15:02,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-11-07 22:15:02,025 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 41 [2018-11-07 22:15:02,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:02,025 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-11-07 22:15:02,026 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 22:15:02,026 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-11-07 22:15:02,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-11-07 22:15:02,026 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:02,027 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:02,027 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:02,027 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:02,027 INFO L82 PathProgramCache]: Analyzing trace with hash -1434230051, now seen corresponding path program 11 times [2018-11-07 22:15:02,027 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:02,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:02,028 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:02,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:02,028 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:02,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:02,300 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:02,301 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:02,301 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:02,301 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:02,301 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:02,301 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:02,301 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 22:15:02,311 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:15:02,312 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:15:02,326 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-07 22:15:02,326 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:02,329 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:02,340 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:02,341 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:02,675 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:02,696 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:02,696 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-11-07 22:15:02,696 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:02,701 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 22:15:02,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 22:15:02,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-11-07 22:15:02,702 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 14 states. [2018-11-07 22:15:02,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:02,822 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-11-07 22:15:02,823 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 22:15:02,823 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-11-07 22:15:02,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:02,824 INFO L225 Difference]: With dead ends: 54 [2018-11-07 22:15:02,824 INFO L226 Difference]: Without dead ends: 49 [2018-11-07 22:15:02,825 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-11-07 22:15:02,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-11-07 22:15:02,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2018-11-07 22:15:02,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-11-07 22:15:02,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-11-07 22:15:02,831 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 44 [2018-11-07 22:15:02,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:02,832 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-11-07 22:15:02,832 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 22:15:02,832 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-11-07 22:15:02,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-11-07 22:15:02,833 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:02,833 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:02,833 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:02,833 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:02,834 INFO L82 PathProgramCache]: Analyzing trace with hash -85797415, now seen corresponding path program 12 times [2018-11-07 22:15:02,834 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:02,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:02,835 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:02,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:02,835 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:02,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:03,033 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:03,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:03,033 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:03,033 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:03,033 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:03,034 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:03,034 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 22:15:03,044 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:15:03,044 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:15:03,073 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:15:03,073 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:03,076 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:03,088 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:03,089 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:03,471 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:03,491 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:03,491 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-11-07 22:15:03,491 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:03,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-07 22:15:03,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-07 22:15:03,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-11-07 22:15:03,492 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 15 states. [2018-11-07 22:15:03,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:03,537 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-11-07 22:15:03,538 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-07 22:15:03,538 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-11-07 22:15:03,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:03,539 INFO L225 Difference]: With dead ends: 57 [2018-11-07 22:15:03,539 INFO L226 Difference]: Without dead ends: 52 [2018-11-07 22:15:03,539 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-11-07 22:15:03,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-11-07 22:15:03,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2018-11-07 22:15:03,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-11-07 22:15:03,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-11-07 22:15:03,544 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 47 [2018-11-07 22:15:03,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:03,544 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-11-07 22:15:03,544 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-07 22:15:03,545 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-11-07 22:15:03,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-11-07 22:15:03,545 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:03,546 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:03,546 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:03,546 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:03,546 INFO L82 PathProgramCache]: Analyzing trace with hash 241742173, now seen corresponding path program 13 times [2018-11-07 22:15:03,546 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:03,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:03,547 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:03,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:03,547 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:03,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:03,700 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:03,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:03,700 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:03,700 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:03,701 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:03,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:03,701 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 22:15:03,712 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:03,713 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:15:03,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:03,738 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:03,755 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:03,755 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:04,576 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:04,596 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:04,596 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-11-07 22:15:04,596 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:04,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 22:15:04,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 22:15:04,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-11-07 22:15:04,598 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 16 states. [2018-11-07 22:15:04,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:04,648 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-11-07 22:15:04,649 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 22:15:04,649 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-11-07 22:15:04,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:04,650 INFO L225 Difference]: With dead ends: 60 [2018-11-07 22:15:04,650 INFO L226 Difference]: Without dead ends: 55 [2018-11-07 22:15:04,651 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-11-07 22:15:04,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-11-07 22:15:04,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2018-11-07 22:15:04,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-11-07 22:15:04,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-11-07 22:15:04,656 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 50 [2018-11-07 22:15:04,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:04,656 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-11-07 22:15:04,656 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 22:15:04,656 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-11-07 22:15:04,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-11-07 22:15:04,657 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:04,657 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:04,658 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:04,658 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:04,658 INFO L82 PathProgramCache]: Analyzing trace with hash -192088231, now seen corresponding path program 14 times [2018-11-07 22:15:04,658 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:04,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:04,659 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:04,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:04,659 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:04,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:04,835 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:04,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:04,836 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:04,836 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:04,836 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:04,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:04,836 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 22:15:04,846 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:15:04,846 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:15:04,863 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-07 22:15:04,863 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:04,865 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:04,875 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:04,875 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:05,269 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:05,290 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:05,290 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-11-07 22:15:05,290 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:05,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-07 22:15:05,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-07 22:15:05,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-11-07 22:15:05,291 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 17 states. [2018-11-07 22:15:05,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:05,367 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-11-07 22:15:05,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 22:15:05,368 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-11-07 22:15:05,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:05,369 INFO L225 Difference]: With dead ends: 63 [2018-11-07 22:15:05,369 INFO L226 Difference]: Without dead ends: 58 [2018-11-07 22:15:05,370 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-11-07 22:15:05,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-11-07 22:15:05,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2018-11-07 22:15:05,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-11-07 22:15:05,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-11-07 22:15:05,376 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 53 [2018-11-07 22:15:05,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:05,376 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-11-07 22:15:05,376 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-07 22:15:05,376 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-11-07 22:15:05,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-11-07 22:15:05,377 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:05,378 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:05,378 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:05,378 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:05,378 INFO L82 PathProgramCache]: Analyzing trace with hash -877060131, now seen corresponding path program 15 times [2018-11-07 22:15:05,378 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:05,379 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:05,379 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:05,379 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:05,379 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:05,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:05,592 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:05,592 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:05,592 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:05,592 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:05,593 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:05,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:05,593 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 22:15:05,601 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:15:05,601 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:15:05,636 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:15:05,636 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:05,638 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:05,650 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:05,650 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:06,291 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:06,323 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:06,323 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-11-07 22:15:06,323 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:06,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-07 22:15:06,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-07 22:15:06,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 22:15:06,325 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 18 states. [2018-11-07 22:15:06,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:06,457 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-11-07 22:15:06,458 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-07 22:15:06,458 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-11-07 22:15:06,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:06,459 INFO L225 Difference]: With dead ends: 66 [2018-11-07 22:15:06,459 INFO L226 Difference]: Without dead ends: 61 [2018-11-07 22:15:06,460 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 22:15:06,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-11-07 22:15:06,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2018-11-07 22:15:06,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-11-07 22:15:06,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-11-07 22:15:06,466 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 56 [2018-11-07 22:15:06,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:06,466 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-11-07 22:15:06,466 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-07 22:15:06,466 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-11-07 22:15:06,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-11-07 22:15:06,467 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:06,467 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:06,468 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:06,468 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:06,468 INFO L82 PathProgramCache]: Analyzing trace with hash -1485309735, now seen corresponding path program 16 times [2018-11-07 22:15:06,468 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:06,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:06,469 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:06,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:06,469 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:06,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:06,994 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:06,994 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:06,994 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:06,994 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:06,995 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:06,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:06,995 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 22:15:07,003 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:07,003 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:15:07,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:07,029 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:07,042 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:07,043 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:07,829 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:07,849 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:07,849 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-11-07 22:15:07,850 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:07,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 22:15:07,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 22:15:07,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 22:15:07,851 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 19 states. [2018-11-07 22:15:07,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:07,908 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-11-07 22:15:07,916 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 22:15:07,916 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-11-07 22:15:07,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:07,917 INFO L225 Difference]: With dead ends: 69 [2018-11-07 22:15:07,917 INFO L226 Difference]: Without dead ends: 64 [2018-11-07 22:15:07,918 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 22:15:07,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-11-07 22:15:07,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2018-11-07 22:15:07,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-11-07 22:15:07,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-11-07 22:15:07,928 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 59 [2018-11-07 22:15:07,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:07,928 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-11-07 22:15:07,928 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 22:15:07,929 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-11-07 22:15:07,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-11-07 22:15:07,929 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:07,932 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:07,932 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:07,932 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:07,932 INFO L82 PathProgramCache]: Analyzing trace with hash -1382240675, now seen corresponding path program 17 times [2018-11-07 22:15:07,932 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:07,933 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:07,933 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:07,933 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:07,937 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:07,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:08,168 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:08,169 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:08,169 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:08,169 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:08,169 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:08,169 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:08,170 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 22:15:08,187 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:15:08,187 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:15:08,214 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-11-07 22:15:08,214 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:08,216 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:08,227 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:08,227 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:09,047 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:09,067 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:09,067 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-11-07 22:15:09,067 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:09,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-07 22:15:09,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-07 22:15:09,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 22:15:09,069 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 20 states. [2018-11-07 22:15:09,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:09,196 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-11-07 22:15:09,196 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-07 22:15:09,196 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-11-07 22:15:09,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:09,197 INFO L225 Difference]: With dead ends: 72 [2018-11-07 22:15:09,197 INFO L226 Difference]: Without dead ends: 67 [2018-11-07 22:15:09,198 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 22:15:09,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-11-07 22:15:09,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2018-11-07 22:15:09,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-11-07 22:15:09,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-11-07 22:15:09,206 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 62 [2018-11-07 22:15:09,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:09,206 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-11-07 22:15:09,206 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-07 22:15:09,207 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-11-07 22:15:09,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-11-07 22:15:09,207 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:09,207 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:09,208 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:09,208 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:09,208 INFO L82 PathProgramCache]: Analyzing trace with hash -1753490855, now seen corresponding path program 18 times [2018-11-07 22:15:09,208 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:09,212 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:09,212 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:09,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:09,213 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:09,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:10,166 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:10,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:10,166 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:10,166 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:10,166 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:10,167 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:10,167 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 22:15:10,176 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:15:10,177 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:15:10,189 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:15:10,190 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:10,192 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:10,205 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:10,205 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:10,632 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:10,651 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:10,651 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-11-07 22:15:10,652 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:10,652 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-07 22:15:10,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-07 22:15:10,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 22:15:10,653 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 21 states. [2018-11-07 22:15:10,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:10,721 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-11-07 22:15:10,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-07 22:15:10,721 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-11-07 22:15:10,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:10,722 INFO L225 Difference]: With dead ends: 75 [2018-11-07 22:15:10,722 INFO L226 Difference]: Without dead ends: 70 [2018-11-07 22:15:10,723 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 22:15:10,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-11-07 22:15:10,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2018-11-07 22:15:10,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-11-07 22:15:10,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-11-07 22:15:10,728 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 65 [2018-11-07 22:15:10,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:10,728 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-11-07 22:15:10,728 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-07 22:15:10,728 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-11-07 22:15:10,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-11-07 22:15:10,729 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:10,729 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:10,729 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:10,730 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:10,730 INFO L82 PathProgramCache]: Analyzing trace with hash -2126816035, now seen corresponding path program 19 times [2018-11-07 22:15:10,730 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:10,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:10,731 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:10,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:10,731 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:10,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:11,027 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:11,027 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:11,027 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:11,027 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:11,027 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:11,027 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:11,027 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 22:15:11,036 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:11,036 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:15:11,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:11,052 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:11,064 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:11,065 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:11,507 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:11,527 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:11,527 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-11-07 22:15:11,527 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:11,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-07 22:15:11,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-07 22:15:11,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-11-07 22:15:11,529 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 22 states. [2018-11-07 22:15:11,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:11,666 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2018-11-07 22:15:11,667 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-07 22:15:11,667 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-11-07 22:15:11,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:11,668 INFO L225 Difference]: With dead ends: 78 [2018-11-07 22:15:11,668 INFO L226 Difference]: Without dead ends: 73 [2018-11-07 22:15:11,669 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-11-07 22:15:11,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-11-07 22:15:11,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2018-11-07 22:15:11,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-11-07 22:15:11,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2018-11-07 22:15:11,673 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 68 [2018-11-07 22:15:11,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:11,673 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2018-11-07 22:15:11,673 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-07 22:15:11,673 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2018-11-07 22:15:11,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-11-07 22:15:11,674 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:11,674 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:11,675 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:11,675 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:11,675 INFO L82 PathProgramCache]: Analyzing trace with hash 108043225, now seen corresponding path program 20 times [2018-11-07 22:15:11,675 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:11,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:11,676 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:11,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:11,676 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:11,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:11,961 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:11,961 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:11,961 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:11,961 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:11,961 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:11,961 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:11,961 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 22:15:11,970 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:15:11,970 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:15:12,000 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-11-07 22:15:12,000 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:12,002 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:12,012 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:12,012 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:12,502 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:12,521 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:12,522 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-11-07 22:15:12,522 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:12,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-07 22:15:12,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-07 22:15:12,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 22:15:12,523 INFO L87 Difference]: Start difference. First operand 72 states and 72 transitions. Second operand 23 states. [2018-11-07 22:15:12,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:12,619 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-11-07 22:15:12,622 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-07 22:15:12,622 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 71 [2018-11-07 22:15:12,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:12,623 INFO L225 Difference]: With dead ends: 81 [2018-11-07 22:15:12,624 INFO L226 Difference]: Without dead ends: 76 [2018-11-07 22:15:12,625 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 22:15:12,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-11-07 22:15:12,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2018-11-07 22:15:12,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-11-07 22:15:12,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-11-07 22:15:12,628 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 71 [2018-11-07 22:15:12,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:12,628 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-11-07 22:15:12,628 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-07 22:15:12,628 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-11-07 22:15:12,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-11-07 22:15:12,629 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:12,629 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:12,630 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:12,630 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:12,630 INFO L82 PathProgramCache]: Analyzing trace with hash -1782764707, now seen corresponding path program 21 times [2018-11-07 22:15:12,630 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:12,631 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:12,631 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:12,631 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:12,631 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:12,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:13,029 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:13,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:13,029 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:13,029 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:13,029 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:13,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:13,029 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 22:15:13,038 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:15:13,038 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:15:13,054 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:15:13,054 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:13,056 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:13,070 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:13,071 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:13,629 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:13,649 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:13,649 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-11-07 22:15:13,649 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:13,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-07 22:15:13,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-07 22:15:13,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 22:15:13,651 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 24 states. [2018-11-07 22:15:13,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:13,844 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2018-11-07 22:15:13,844 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-07 22:15:13,844 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 74 [2018-11-07 22:15:13,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:13,846 INFO L225 Difference]: With dead ends: 84 [2018-11-07 22:15:13,846 INFO L226 Difference]: Without dead ends: 79 [2018-11-07 22:15:13,848 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 22:15:13,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-11-07 22:15:13,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2018-11-07 22:15:13,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-11-07 22:15:13,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 78 transitions. [2018-11-07 22:15:13,851 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 78 transitions. Word has length 74 [2018-11-07 22:15:13,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:13,852 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 78 transitions. [2018-11-07 22:15:13,852 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-07 22:15:13,852 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 78 transitions. [2018-11-07 22:15:13,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-11-07 22:15:13,853 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:13,853 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:13,853 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:13,854 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:13,854 INFO L82 PathProgramCache]: Analyzing trace with hash 1949187417, now seen corresponding path program 22 times [2018-11-07 22:15:13,854 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:13,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:13,855 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:13,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:13,855 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:13,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:14,330 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:14,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:14,331 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:14,331 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:14,331 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:14,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:14,331 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 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 22:15:14,339 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:14,339 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:15:14,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:14,360 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:14,378 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:14,378 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:15,211 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:15,230 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:15,230 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-11-07 22:15:15,231 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:15,231 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-07 22:15:15,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-07 22:15:15,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 22:15:15,232 INFO L87 Difference]: Start difference. First operand 78 states and 78 transitions. Second operand 25 states. [2018-11-07 22:15:15,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:15,322 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2018-11-07 22:15:15,328 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-07 22:15:15,328 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 77 [2018-11-07 22:15:15,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:15,329 INFO L225 Difference]: With dead ends: 87 [2018-11-07 22:15:15,329 INFO L226 Difference]: Without dead ends: 82 [2018-11-07 22:15:15,330 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 22:15:15,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-11-07 22:15:15,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2018-11-07 22:15:15,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-11-07 22:15:15,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2018-11-07 22:15:15,333 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 77 [2018-11-07 22:15:15,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:15,334 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2018-11-07 22:15:15,334 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-07 22:15:15,334 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2018-11-07 22:15:15,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-11-07 22:15:15,334 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:15,335 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:15,335 INFO L423 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:15,335 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:15,335 INFO L82 PathProgramCache]: Analyzing trace with hash 1011489245, now seen corresponding path program 23 times [2018-11-07 22:15:15,335 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:15,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:15,336 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:15,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:15,336 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:15,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:15,625 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:15,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:15,625 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:15,625 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:15,625 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:15,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:15,626 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 22:15:15,634 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:15:15,634 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:15:15,653 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-11-07 22:15:15,654 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:15,655 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:15,666 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:15,667 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:16,335 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:16,355 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:16,355 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2018-11-07 22:15:16,355 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:16,356 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-07 22:15:16,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-07 22:15:16,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-11-07 22:15:16,357 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 26 states. [2018-11-07 22:15:16,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:16,438 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2018-11-07 22:15:16,438 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-07 22:15:16,438 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 80 [2018-11-07 22:15:16,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:16,439 INFO L225 Difference]: With dead ends: 90 [2018-11-07 22:15:16,439 INFO L226 Difference]: Without dead ends: 85 [2018-11-07 22:15:16,441 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-11-07 22:15:16,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-11-07 22:15:16,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 84. [2018-11-07 22:15:16,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-11-07 22:15:16,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 84 transitions. [2018-11-07 22:15:16,445 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 84 transitions. Word has length 80 [2018-11-07 22:15:16,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:16,445 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 84 transitions. [2018-11-07 22:15:16,445 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-07 22:15:16,445 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 84 transitions. [2018-11-07 22:15:16,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-11-07 22:15:16,446 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:16,446 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:16,446 INFO L423 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:16,446 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:16,447 INFO L82 PathProgramCache]: Analyzing trace with hash 512540377, now seen corresponding path program 24 times [2018-11-07 22:15:16,447 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:16,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:16,448 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:16,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:16,448 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:16,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:16,759 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:16,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:16,760 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:16,760 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:16,760 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:16,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:16,760 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 22:15:16,769 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:15:16,769 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:15:16,808 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:15:16,808 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:16,810 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:16,823 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:16,824 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:17,550 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:17,570 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:17,570 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2018-11-07 22:15:17,570 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:17,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-11-07 22:15:17,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-11-07 22:15:17,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-07 22:15:17,572 INFO L87 Difference]: Start difference. First operand 84 states and 84 transitions. Second operand 27 states. [2018-11-07 22:15:17,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:17,664 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2018-11-07 22:15:17,664 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-11-07 22:15:17,664 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 83 [2018-11-07 22:15:17,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:17,665 INFO L225 Difference]: With dead ends: 93 [2018-11-07 22:15:17,665 INFO L226 Difference]: Without dead ends: 88 [2018-11-07 22:15:17,666 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-11-07 22:15:17,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-11-07 22:15:17,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2018-11-07 22:15:17,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-11-07 22:15:17,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2018-11-07 22:15:17,669 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 83 [2018-11-07 22:15:17,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:17,669 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2018-11-07 22:15:17,669 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-11-07 22:15:17,669 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2018-11-07 22:15:17,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-11-07 22:15:17,670 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:17,670 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:17,670 INFO L423 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:17,670 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:17,670 INFO L82 PathProgramCache]: Analyzing trace with hash 1208625245, now seen corresponding path program 25 times [2018-11-07 22:15:17,670 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:17,671 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:17,671 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:17,671 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:17,671 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:17,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:18,658 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:18,659 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:18,659 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:18,659 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:18,659 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:18,659 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:18,659 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 22:15:18,671 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:18,672 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:15:18,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:18,688 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:18,701 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:18,702 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:20,767 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:20,789 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:20,789 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 54 [2018-11-07 22:15:20,789 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:20,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-07 22:15:20,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-07 22:15:20,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-11-07 22:15:20,791 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 28 states. [2018-11-07 22:15:20,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:20,875 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2018-11-07 22:15:20,876 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-07 22:15:20,876 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 86 [2018-11-07 22:15:20,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:20,877 INFO L225 Difference]: With dead ends: 96 [2018-11-07 22:15:20,878 INFO L226 Difference]: Without dead ends: 91 [2018-11-07 22:15:20,879 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-11-07 22:15:20,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-11-07 22:15:20,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2018-11-07 22:15:20,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-11-07 22:15:20,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 90 transitions. [2018-11-07 22:15:20,883 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 90 transitions. Word has length 86 [2018-11-07 22:15:20,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:20,883 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 90 transitions. [2018-11-07 22:15:20,883 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-07 22:15:20,883 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 90 transitions. [2018-11-07 22:15:20,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-11-07 22:15:20,884 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:20,884 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:20,884 INFO L423 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:20,885 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:20,885 INFO L82 PathProgramCache]: Analyzing trace with hash -2124144551, now seen corresponding path program 26 times [2018-11-07 22:15:20,885 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:20,886 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:20,886 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:20,886 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:20,886 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:20,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:21,340 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:21,340 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:21,340 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:21,340 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:21,340 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:21,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:21,341 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 22:15:21,349 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:15:21,349 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:15:21,372 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-11-07 22:15:21,373 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:21,374 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:21,388 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:21,388 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:22,218 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:22,237 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:22,238 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-11-07 22:15:22,238 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:22,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-11-07 22:15:22,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-11-07 22:15:22,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2018-11-07 22:15:22,240 INFO L87 Difference]: Start difference. First operand 90 states and 90 transitions. Second operand 29 states. [2018-11-07 22:15:22,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:22,322 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2018-11-07 22:15:22,323 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-07 22:15:22,323 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 89 [2018-11-07 22:15:22,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:22,324 INFO L225 Difference]: With dead ends: 99 [2018-11-07 22:15:22,324 INFO L226 Difference]: Without dead ends: 94 [2018-11-07 22:15:22,326 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2018-11-07 22:15:22,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-11-07 22:15:22,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2018-11-07 22:15:22,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-11-07 22:15:22,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2018-11-07 22:15:22,329 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 89 [2018-11-07 22:15:22,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:22,329 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2018-11-07 22:15:22,329 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-11-07 22:15:22,329 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2018-11-07 22:15:22,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-11-07 22:15:22,330 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:22,330 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:22,330 INFO L423 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:22,330 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:22,330 INFO L82 PathProgramCache]: Analyzing trace with hash -1910155555, now seen corresponding path program 27 times [2018-11-07 22:15:22,330 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:22,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:22,331 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:22,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:22,331 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:22,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:22,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:22,950 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:22,950 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:22,950 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:22,950 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:22,950 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:22,950 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 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 22:15:22,960 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:15:22,961 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:15:22,975 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:15:22,975 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:22,977 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:22,992 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:22,992 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:23,932 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:23,951 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:23,951 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 58 [2018-11-07 22:15:23,952 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:23,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-11-07 22:15:23,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-11-07 22:15:23,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1653, Invalid=1653, Unknown=0, NotChecked=0, Total=3306 [2018-11-07 22:15:23,954 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 30 states. [2018-11-07 22:15:24,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:24,044 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2018-11-07 22:15:24,044 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-11-07 22:15:24,044 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 92 [2018-11-07 22:15:24,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:24,045 INFO L225 Difference]: With dead ends: 102 [2018-11-07 22:15:24,046 INFO L226 Difference]: Without dead ends: 97 [2018-11-07 22:15:24,047 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1653, Invalid=1653, Unknown=0, NotChecked=0, Total=3306 [2018-11-07 22:15:24,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-11-07 22:15:24,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2018-11-07 22:15:24,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-11-07 22:15:24,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 96 transitions. [2018-11-07 22:15:24,050 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 96 transitions. Word has length 92 [2018-11-07 22:15:24,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:24,050 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 96 transitions. [2018-11-07 22:15:24,050 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-11-07 22:15:24,050 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 96 transitions. [2018-11-07 22:15:24,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-11-07 22:15:24,051 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:24,051 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:24,051 INFO L423 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:24,052 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:24,052 INFO L82 PathProgramCache]: Analyzing trace with hash -695442983, now seen corresponding path program 28 times [2018-11-07 22:15:24,052 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:24,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:24,053 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:24,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:24,053 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:24,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:25,184 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:25,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:25,184 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:25,185 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:25,185 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:25,185 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:25,185 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 22:15:25,194 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:25,194 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:15:25,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:25,215 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:25,240 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:25,240 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:26,445 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:26,464 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:26,464 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 60 [2018-11-07 22:15:26,464 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:26,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-11-07 22:15:26,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-11-07 22:15:26,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1770, Invalid=1770, Unknown=0, NotChecked=0, Total=3540 [2018-11-07 22:15:26,466 INFO L87 Difference]: Start difference. First operand 96 states and 96 transitions. Second operand 31 states. [2018-11-07 22:15:26,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:26,602 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2018-11-07 22:15:26,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-11-07 22:15:26,605 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 95 [2018-11-07 22:15:26,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:26,606 INFO L225 Difference]: With dead ends: 105 [2018-11-07 22:15:26,606 INFO L226 Difference]: Without dead ends: 100 [2018-11-07 22:15:26,607 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1770, Invalid=1770, Unknown=0, NotChecked=0, Total=3540 [2018-11-07 22:15:26,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-11-07 22:15:26,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2018-11-07 22:15:26,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-11-07 22:15:26,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2018-11-07 22:15:26,610 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 95 [2018-11-07 22:15:26,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:26,610 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2018-11-07 22:15:26,610 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-11-07 22:15:26,610 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2018-11-07 22:15:26,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-11-07 22:15:26,611 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:26,611 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:26,611 INFO L423 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:26,611 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:26,612 INFO L82 PathProgramCache]: Analyzing trace with hash 1707320669, now seen corresponding path program 29 times [2018-11-07 22:15:26,612 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:26,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:26,612 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:26,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:26,612 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:26,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:27,685 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:27,686 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:27,686 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:27,686 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:27,686 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:27,686 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:27,686 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 22:15:27,701 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:15:27,701 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:15:27,726 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-11-07 22:15:27,726 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:27,728 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:27,745 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:27,745 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:28,840 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:28,861 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:28,861 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2018-11-07 22:15:28,861 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:28,862 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-11-07 22:15:28,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-11-07 22:15:28,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1891, Invalid=1891, Unknown=0, NotChecked=0, Total=3782 [2018-11-07 22:15:28,863 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 32 states. [2018-11-07 22:15:29,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:29,113 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2018-11-07 22:15:29,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-11-07 22:15:29,114 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 98 [2018-11-07 22:15:29,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:29,115 INFO L225 Difference]: With dead ends: 108 [2018-11-07 22:15:29,115 INFO L226 Difference]: Without dead ends: 103 [2018-11-07 22:15:29,116 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1891, Invalid=1891, Unknown=0, NotChecked=0, Total=3782 [2018-11-07 22:15:29,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-11-07 22:15:29,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2018-11-07 22:15:29,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-11-07 22:15:29,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 102 transitions. [2018-11-07 22:15:29,120 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 102 transitions. Word has length 98 [2018-11-07 22:15:29,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:29,120 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 102 transitions. [2018-11-07 22:15:29,120 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-11-07 22:15:29,120 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 102 transitions. [2018-11-07 22:15:29,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-11-07 22:15:29,121 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:29,121 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:29,121 INFO L423 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:29,121 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:29,121 INFO L82 PathProgramCache]: Analyzing trace with hash -1780645031, now seen corresponding path program 30 times [2018-11-07 22:15:29,121 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:29,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:29,122 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:29,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:29,122 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:29,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:30,064 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:30,065 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:30,065 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:30,065 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:30,065 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:30,065 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:30,065 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 22:15:30,075 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:15:30,075 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:15:30,092 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:15:30,093 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:30,095 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:30,112 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:30,112 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:31,190 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:31,210 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:31,210 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 64 [2018-11-07 22:15:31,210 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:31,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-11-07 22:15:31,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-11-07 22:15:31,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2016, Invalid=2016, Unknown=0, NotChecked=0, Total=4032 [2018-11-07 22:15:31,211 INFO L87 Difference]: Start difference. First operand 102 states and 102 transitions. Second operand 33 states. [2018-11-07 22:15:31,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:31,354 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2018-11-07 22:15:31,354 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-11-07 22:15:31,354 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 101 [2018-11-07 22:15:31,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:31,355 INFO L225 Difference]: With dead ends: 111 [2018-11-07 22:15:31,355 INFO L226 Difference]: Without dead ends: 106 [2018-11-07 22:15:31,356 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2016, Invalid=2016, Unknown=0, NotChecked=0, Total=4032 [2018-11-07 22:15:31,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-11-07 22:15:31,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2018-11-07 22:15:31,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-11-07 22:15:31,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2018-11-07 22:15:31,359 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 101 [2018-11-07 22:15:31,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:31,360 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2018-11-07 22:15:31,360 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-11-07 22:15:31,360 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2018-11-07 22:15:31,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-11-07 22:15:31,361 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:31,361 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:31,361 INFO L423 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:31,361 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:31,361 INFO L82 PathProgramCache]: Analyzing trace with hash 671945693, now seen corresponding path program 31 times [2018-11-07 22:15:31,361 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:31,362 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:31,362 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:31,362 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:31,362 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:31,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:31,840 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:31,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:31,841 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:31,841 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:31,841 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:31,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:31,841 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 22:15:31,851 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:31,851 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:15:31,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:31,870 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:31,884 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:31,885 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:32,978 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:32,998 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:32,998 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 66 [2018-11-07 22:15:32,998 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:32,999 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-11-07 22:15:32,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-11-07 22:15:33,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2145, Invalid=2145, Unknown=0, NotChecked=0, Total=4290 [2018-11-07 22:15:33,000 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 34 states. [2018-11-07 22:15:33,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:33,114 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2018-11-07 22:15:33,114 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-11-07 22:15:33,114 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 104 [2018-11-07 22:15:33,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:33,115 INFO L225 Difference]: With dead ends: 114 [2018-11-07 22:15:33,116 INFO L226 Difference]: Without dead ends: 109 [2018-11-07 22:15:33,117 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 177 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2145, Invalid=2145, Unknown=0, NotChecked=0, Total=4290 [2018-11-07 22:15:33,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-11-07 22:15:33,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 108. [2018-11-07 22:15:33,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-11-07 22:15:33,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 108 transitions. [2018-11-07 22:15:33,120 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 108 transitions. Word has length 104 [2018-11-07 22:15:33,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:33,121 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 108 transitions. [2018-11-07 22:15:33,121 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-11-07 22:15:33,121 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 108 transitions. [2018-11-07 22:15:33,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-11-07 22:15:33,121 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:33,122 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:33,122 INFO L423 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:33,122 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:33,122 INFO L82 PathProgramCache]: Analyzing trace with hash -181435175, now seen corresponding path program 32 times [2018-11-07 22:15:33,122 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:33,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:33,123 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:33,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:33,123 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:33,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:33,656 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:33,656 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:33,657 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:33,657 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:33,657 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:33,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:33,657 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 22:15:33,666 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:15:33,666 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:15:33,695 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-11-07 22:15:33,695 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:33,698 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:33,718 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:33,718 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:35,262 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:35,282 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:35,282 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 68 [2018-11-07 22:15:35,282 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:35,282 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-11-07 22:15:35,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-11-07 22:15:35,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2278, Invalid=2278, Unknown=0, NotChecked=0, Total=4556 [2018-11-07 22:15:35,284 INFO L87 Difference]: Start difference. First operand 108 states and 108 transitions. Second operand 35 states. [2018-11-07 22:15:35,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:35,432 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2018-11-07 22:15:35,433 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-11-07 22:15:35,433 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 107 [2018-11-07 22:15:35,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:35,434 INFO L225 Difference]: With dead ends: 117 [2018-11-07 22:15:35,435 INFO L226 Difference]: Without dead ends: 112 [2018-11-07 22:15:35,436 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2278, Invalid=2278, Unknown=0, NotChecked=0, Total=4556 [2018-11-07 22:15:35,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-11-07 22:15:35,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2018-11-07 22:15:35,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-11-07 22:15:35,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2018-11-07 22:15:35,439 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 107 [2018-11-07 22:15:35,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:35,439 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2018-11-07 22:15:35,439 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-11-07 22:15:35,439 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2018-11-07 22:15:35,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-11-07 22:15:35,440 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:35,440 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:35,440 INFO L423 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:35,440 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:35,440 INFO L82 PathProgramCache]: Analyzing trace with hash -1339448739, now seen corresponding path program 33 times [2018-11-07 22:15:35,440 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:35,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:35,441 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:35,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:35,441 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:35,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:36,146 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:36,146 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:36,146 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:36,146 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:36,147 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:36,147 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:36,147 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 22:15:36,155 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:15:36,156 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:15:36,173 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:15:36,173 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:36,176 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:36,192 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:36,192 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:37,433 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:37,453 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:37,453 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 70 [2018-11-07 22:15:37,453 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:37,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-11-07 22:15:37,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-11-07 22:15:37,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2415, Invalid=2415, Unknown=0, NotChecked=0, Total=4830 [2018-11-07 22:15:37,455 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 36 states. [2018-11-07 22:15:37,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:37,608 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2018-11-07 22:15:37,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-11-07 22:15:37,608 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 110 [2018-11-07 22:15:37,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:37,609 INFO L225 Difference]: With dead ends: 120 [2018-11-07 22:15:37,609 INFO L226 Difference]: Without dead ends: 115 [2018-11-07 22:15:37,610 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 187 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2415, Invalid=2415, Unknown=0, NotChecked=0, Total=4830 [2018-11-07 22:15:37,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-11-07 22:15:37,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 114. [2018-11-07 22:15:37,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-11-07 22:15:37,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 114 transitions. [2018-11-07 22:15:37,614 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 114 transitions. Word has length 110 [2018-11-07 22:15:37,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:37,615 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 114 transitions. [2018-11-07 22:15:37,615 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-11-07 22:15:37,615 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 114 transitions. [2018-11-07 22:15:37,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-11-07 22:15:37,615 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:37,616 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:37,616 INFO L423 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:37,616 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:37,616 INFO L82 PathProgramCache]: Analyzing trace with hash 1750754905, now seen corresponding path program 34 times [2018-11-07 22:15:37,616 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:37,617 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:37,617 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:37,617 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:37,617 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:37,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:38,176 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:38,176 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:38,176 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:38,176 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:38,176 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:38,177 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:38,177 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 22:15:38,185 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:38,185 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:15:38,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:38,207 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:38,223 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:38,223 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:39,549 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:39,569 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:39,569 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 72 [2018-11-07 22:15:39,570 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:39,570 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-11-07 22:15:39,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-11-07 22:15:39,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2556, Invalid=2556, Unknown=0, NotChecked=0, Total=5112 [2018-11-07 22:15:39,571 INFO L87 Difference]: Start difference. First operand 114 states and 114 transitions. Second operand 37 states. [2018-11-07 22:15:39,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:39,688 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2018-11-07 22:15:39,688 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-11-07 22:15:39,688 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 113 [2018-11-07 22:15:39,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:39,689 INFO L225 Difference]: With dead ends: 123 [2018-11-07 22:15:39,689 INFO L226 Difference]: Without dead ends: 118 [2018-11-07 22:15:39,690 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 192 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2556, Invalid=2556, Unknown=0, NotChecked=0, Total=5112 [2018-11-07 22:15:39,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-11-07 22:15:39,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2018-11-07 22:15:39,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-11-07 22:15:39,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2018-11-07 22:15:39,693 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 113 [2018-11-07 22:15:39,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:39,694 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2018-11-07 22:15:39,694 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-11-07 22:15:39,694 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2018-11-07 22:15:39,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-11-07 22:15:39,695 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:39,695 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:39,695 INFO L423 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:39,695 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:39,695 INFO L82 PathProgramCache]: Analyzing trace with hash -616476451, now seen corresponding path program 35 times [2018-11-07 22:15:39,695 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:39,696 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:39,696 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:39,696 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:39,696 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:39,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:40,642 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:40,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:40,643 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:40,643 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:40,643 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:40,643 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:40,643 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 22:15:40,651 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:15:40,651 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:15:40,685 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-11-07 22:15:40,685 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:40,688 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:40,709 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:40,709 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:42,149 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:42,168 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:42,168 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 74 [2018-11-07 22:15:42,168 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:42,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-11-07 22:15:42,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-11-07 22:15:42,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2701, Invalid=2701, Unknown=0, NotChecked=0, Total=5402 [2018-11-07 22:15:42,169 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 38 states. [2018-11-07 22:15:42,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:42,300 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2018-11-07 22:15:42,303 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-11-07 22:15:42,303 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 116 [2018-11-07 22:15:42,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:42,304 INFO L225 Difference]: With dead ends: 126 [2018-11-07 22:15:42,304 INFO L226 Difference]: Without dead ends: 121 [2018-11-07 22:15:42,305 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 197 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2701, Invalid=2701, Unknown=0, NotChecked=0, Total=5402 [2018-11-07 22:15:42,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-11-07 22:15:42,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 120. [2018-11-07 22:15:42,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-11-07 22:15:42,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 120 transitions. [2018-11-07 22:15:42,308 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 120 transitions. Word has length 116 [2018-11-07 22:15:42,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:42,309 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 120 transitions. [2018-11-07 22:15:42,309 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-11-07 22:15:42,309 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 120 transitions. [2018-11-07 22:15:42,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-11-07 22:15:42,309 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:42,313 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:42,313 INFO L423 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:42,313 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:42,313 INFO L82 PathProgramCache]: Analyzing trace with hash 557197273, now seen corresponding path program 36 times [2018-11-07 22:15:42,314 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:42,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:42,314 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:42,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:42,314 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:42,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:43,701 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:43,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:43,701 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:43,702 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:43,702 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:43,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:43,702 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 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 22:15:43,711 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:15:43,711 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:15:43,729 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:15:43,729 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:43,733 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:43,755 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:43,755 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:45,746 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:45,765 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:45,765 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 76 [2018-11-07 22:15:45,765 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:45,766 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-11-07 22:15:45,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-11-07 22:15:45,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2850, Invalid=2850, Unknown=0, NotChecked=0, Total=5700 [2018-11-07 22:15:45,767 INFO L87 Difference]: Start difference. First operand 120 states and 120 transitions. Second operand 39 states. [2018-11-07 22:15:45,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:45,913 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2018-11-07 22:15:45,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-11-07 22:15:45,913 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 119 [2018-11-07 22:15:45,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:45,914 INFO L225 Difference]: With dead ends: 129 [2018-11-07 22:15:45,914 INFO L226 Difference]: Without dead ends: 124 [2018-11-07 22:15:45,915 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 202 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2850, Invalid=2850, Unknown=0, NotChecked=0, Total=5700 [2018-11-07 22:15:45,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-11-07 22:15:45,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2018-11-07 22:15:45,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-11-07 22:15:45,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2018-11-07 22:15:45,918 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 119 [2018-11-07 22:15:45,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:45,919 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2018-11-07 22:15:45,919 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-11-07 22:15:45,919 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2018-11-07 22:15:45,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-11-07 22:15:45,919 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:45,920 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:45,920 INFO L423 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:45,920 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:45,920 INFO L82 PathProgramCache]: Analyzing trace with hash 142352221, now seen corresponding path program 37 times [2018-11-07 22:15:45,920 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:45,921 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:45,921 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:45,921 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:45,921 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:45,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:47,349 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:47,350 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:47,350 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:47,350 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:47,350 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:47,350 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:47,350 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 22:15:47,362 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:47,362 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:15:47,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:47,382 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:47,402 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:47,402 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:48,930 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:48,949 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:48,949 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 78 [2018-11-07 22:15:48,949 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:48,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-11-07 22:15:48,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-11-07 22:15:48,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3003, Invalid=3003, Unknown=0, NotChecked=0, Total=6006 [2018-11-07 22:15:48,951 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 40 states. [2018-11-07 22:15:49,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:49,071 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2018-11-07 22:15:49,074 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-11-07 22:15:49,074 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 122 [2018-11-07 22:15:49,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:49,075 INFO L225 Difference]: With dead ends: 132 [2018-11-07 22:15:49,075 INFO L226 Difference]: Without dead ends: 127 [2018-11-07 22:15:49,075 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 207 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3003, Invalid=3003, Unknown=0, NotChecked=0, Total=6006 [2018-11-07 22:15:49,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-11-07 22:15:49,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 126. [2018-11-07 22:15:49,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-11-07 22:15:49,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 126 transitions. [2018-11-07 22:15:49,079 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 126 transitions. Word has length 122 [2018-11-07 22:15:49,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:49,079 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 126 transitions. [2018-11-07 22:15:49,080 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-11-07 22:15:49,080 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 126 transitions. [2018-11-07 22:15:49,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-11-07 22:15:49,080 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:49,081 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:49,081 INFO L423 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:49,081 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:49,081 INFO L82 PathProgramCache]: Analyzing trace with hash -1885681319, now seen corresponding path program 38 times [2018-11-07 22:15:49,081 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:49,082 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:49,082 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:49,082 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:49,082 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:49,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:49,712 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:49,712 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:49,713 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:49,713 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:49,713 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:49,713 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:49,713 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 22:15:49,721 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:15:49,721 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:15:49,754 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-11-07 22:15:49,755 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:49,757 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:49,781 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:49,781 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:51,722 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:51,742 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:51,743 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 80 [2018-11-07 22:15:51,743 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:51,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-11-07 22:15:51,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-11-07 22:15:51,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2018-11-07 22:15:51,744 INFO L87 Difference]: Start difference. First operand 126 states and 126 transitions. Second operand 41 states. [2018-11-07 22:15:51,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:51,950 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2018-11-07 22:15:51,950 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-11-07 22:15:51,951 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 125 [2018-11-07 22:15:51,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:51,952 INFO L225 Difference]: With dead ends: 135 [2018-11-07 22:15:51,952 INFO L226 Difference]: Without dead ends: 130 [2018-11-07 22:15:51,953 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 212 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2018-11-07 22:15:51,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-11-07 22:15:51,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2018-11-07 22:15:51,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-11-07 22:15:51,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2018-11-07 22:15:51,957 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 125 [2018-11-07 22:15:51,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:51,957 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2018-11-07 22:15:51,957 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-11-07 22:15:51,958 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2018-11-07 22:15:51,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-11-07 22:15:51,958 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:51,958 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:51,959 INFO L423 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:51,959 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:51,959 INFO L82 PathProgramCache]: Analyzing trace with hash -1727918627, now seen corresponding path program 39 times [2018-11-07 22:15:51,959 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:51,960 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:51,960 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:51,960 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:51,960 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:51,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:53,071 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:53,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:53,071 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:53,071 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:53,072 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:53,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:53,072 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 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 22:15:53,081 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:15:53,081 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:15:53,099 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:15:53,099 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:53,102 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:53,121 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:53,121 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:54,794 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:54,823 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:54,823 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 82 [2018-11-07 22:15:54,823 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:54,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-11-07 22:15:54,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-11-07 22:15:54,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3321, Invalid=3321, Unknown=0, NotChecked=0, Total=6642 [2018-11-07 22:15:54,825 INFO L87 Difference]: Start difference. First operand 129 states and 129 transitions. Second operand 42 states. [2018-11-07 22:15:55,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:55,282 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2018-11-07 22:15:55,287 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-11-07 22:15:55,287 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 128 [2018-11-07 22:15:55,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:55,288 INFO L225 Difference]: With dead ends: 138 [2018-11-07 22:15:55,288 INFO L226 Difference]: Without dead ends: 133 [2018-11-07 22:15:55,289 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 217 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=3321, Invalid=3321, Unknown=0, NotChecked=0, Total=6642 [2018-11-07 22:15:55,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-11-07 22:15:55,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 132. [2018-11-07 22:15:55,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-11-07 22:15:55,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 132 transitions. [2018-11-07 22:15:55,293 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 132 transitions. Word has length 128 [2018-11-07 22:15:55,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:55,293 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 132 transitions. [2018-11-07 22:15:55,293 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-11-07 22:15:55,293 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 132 transitions. [2018-11-07 22:15:55,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-11-07 22:15:55,294 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:55,294 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:55,295 INFO L423 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:55,295 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:55,295 INFO L82 PathProgramCache]: Analyzing trace with hash -513783079, now seen corresponding path program 40 times [2018-11-07 22:15:55,295 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:55,296 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:55,296 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:55,296 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:55,296 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:55,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:56,275 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:56,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:56,275 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:56,275 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:56,275 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:56,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:56,276 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 22:15:56,286 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:56,286 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:15:56,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:56,309 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:56,334 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:56,334 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:58,539 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:58,571 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:58,571 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 84 [2018-11-07 22:15:58,571 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:58,572 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-11-07 22:15:58,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-11-07 22:15:58,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3486, Invalid=3486, Unknown=0, NotChecked=0, Total=6972 [2018-11-07 22:15:58,573 INFO L87 Difference]: Start difference. First operand 132 states and 132 transitions. Second operand 43 states. [2018-11-07 22:15:58,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:58,784 INFO L93 Difference]: Finished difference Result 141 states and 141 transitions. [2018-11-07 22:15:58,784 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-11-07 22:15:58,785 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 131 [2018-11-07 22:15:58,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:58,786 INFO L225 Difference]: With dead ends: 141 [2018-11-07 22:15:58,786 INFO L226 Difference]: Without dead ends: 136 [2018-11-07 22:15:58,787 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 222 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3486, Invalid=3486, Unknown=0, NotChecked=0, Total=6972 [2018-11-07 22:15:58,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-11-07 22:15:58,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2018-11-07 22:15:58,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-11-07 22:15:58,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 135 transitions. [2018-11-07 22:15:58,791 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 135 transitions. Word has length 131 [2018-11-07 22:15:58,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:58,791 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 135 transitions. [2018-11-07 22:15:58,791 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-11-07 22:15:58,791 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 135 transitions. [2018-11-07 22:15:58,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-11-07 22:15:58,792 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:58,792 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:58,793 INFO L423 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:58,793 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:58,793 INFO L82 PathProgramCache]: Analyzing trace with hash 1878727773, now seen corresponding path program 41 times [2018-11-07 22:15:58,793 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:58,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:58,794 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:58,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:58,794 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:58,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:59,585 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:59,585 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:59,585 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:59,586 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:59,586 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:59,586 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:59,586 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 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 22:15:59,596 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:15:59,596 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:15:59,785 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-11-07 22:15:59,785 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:59,788 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:59,807 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:59,807 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:16:01,948 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:01,968 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:16:01,968 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 86 [2018-11-07 22:16:01,968 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:16:01,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-11-07 22:16:01,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-11-07 22:16:01,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2018-11-07 22:16:01,969 INFO L87 Difference]: Start difference. First operand 135 states and 135 transitions. Second operand 44 states. [2018-11-07 22:16:02,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:16:02,640 INFO L93 Difference]: Finished difference Result 144 states and 144 transitions. [2018-11-07 22:16:02,640 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-11-07 22:16:02,640 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 134 [2018-11-07 22:16:02,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:16:02,641 INFO L225 Difference]: With dead ends: 144 [2018-11-07 22:16:02,641 INFO L226 Difference]: Without dead ends: 139 [2018-11-07 22:16:02,642 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 311 GetRequests, 227 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2018-11-07 22:16:02,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-11-07 22:16:02,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 138. [2018-11-07 22:16:02,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-11-07 22:16:02,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 138 transitions. [2018-11-07 22:16:02,646 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 138 transitions. Word has length 134 [2018-11-07 22:16:02,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:16:02,646 INFO L480 AbstractCegarLoop]: Abstraction has 138 states and 138 transitions. [2018-11-07 22:16:02,646 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-11-07 22:16:02,646 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 138 transitions. [2018-11-07 22:16:02,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-11-07 22:16:02,647 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:16:02,647 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:16:02,648 INFO L423 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:16:02,648 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:16:02,648 INFO L82 PathProgramCache]: Analyzing trace with hash -2107724711, now seen corresponding path program 42 times [2018-11-07 22:16:02,648 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:16:02,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:02,649 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:16:02,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:02,649 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:16:02,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:03,447 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:03,448 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:03,448 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:16:03,448 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:16:03,448 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:16:03,448 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:03,448 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 22:16:03,457 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:16:03,458 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:16:03,478 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:16:03,478 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:16:03,483 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:16:03,510 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:03,510 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:16:05,955 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:05,976 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:16:05,977 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 88 [2018-11-07 22:16:05,977 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:16:05,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-11-07 22:16:05,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-11-07 22:16:05,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3828, Invalid=3828, Unknown=0, NotChecked=0, Total=7656 [2018-11-07 22:16:05,978 INFO L87 Difference]: Start difference. First operand 138 states and 138 transitions. Second operand 45 states. [2018-11-07 22:16:06,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:16:06,105 INFO L93 Difference]: Finished difference Result 147 states and 147 transitions. [2018-11-07 22:16:06,105 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-11-07 22:16:06,106 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 137 [2018-11-07 22:16:06,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:16:06,107 INFO L225 Difference]: With dead ends: 147 [2018-11-07 22:16:06,107 INFO L226 Difference]: Without dead ends: 142 [2018-11-07 22:16:06,108 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 232 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3828, Invalid=3828, Unknown=0, NotChecked=0, Total=7656 [2018-11-07 22:16:06,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-11-07 22:16:06,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 141. [2018-11-07 22:16:06,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-11-07 22:16:06,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 141 transitions. [2018-11-07 22:16:06,112 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 141 transitions. Word has length 137 [2018-11-07 22:16:06,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:16:06,112 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 141 transitions. [2018-11-07 22:16:06,112 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-11-07 22:16:06,112 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 141 transitions. [2018-11-07 22:16:06,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-11-07 22:16:06,113 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:16:06,113 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:16:06,114 INFO L423 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:16:06,114 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:16:06,114 INFO L82 PathProgramCache]: Analyzing trace with hash 1921993437, now seen corresponding path program 43 times [2018-11-07 22:16:06,114 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:16:06,115 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:06,115 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:16:06,115 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:06,115 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:16:06,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:06,912 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:06,912 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:06,913 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:16:06,913 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:16:06,913 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:16:06,913 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:06,913 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 22:16:06,924 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:16:06,924 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:16:06,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:06,950 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:16:06,979 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:06,980 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:16:10,306 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:10,326 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:16:10,326 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 90 [2018-11-07 22:16:10,326 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:16:10,327 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-11-07 22:16:10,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-11-07 22:16:10,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4005, Invalid=4005, Unknown=0, NotChecked=0, Total=8010 [2018-11-07 22:16:10,328 INFO L87 Difference]: Start difference. First operand 141 states and 141 transitions. Second operand 46 states. [2018-11-07 22:16:10,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:16:10,466 INFO L93 Difference]: Finished difference Result 150 states and 150 transitions. [2018-11-07 22:16:10,466 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-11-07 22:16:10,466 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 140 [2018-11-07 22:16:10,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:16:10,468 INFO L225 Difference]: With dead ends: 150 [2018-11-07 22:16:10,468 INFO L226 Difference]: Without dead ends: 145 [2018-11-07 22:16:10,469 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 237 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=4005, Invalid=4005, Unknown=0, NotChecked=0, Total=8010 [2018-11-07 22:16:10,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-11-07 22:16:10,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 144. [2018-11-07 22:16:10,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-11-07 22:16:10,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 144 transitions. [2018-11-07 22:16:10,472 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 144 transitions. Word has length 140 [2018-11-07 22:16:10,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:16:10,472 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 144 transitions. [2018-11-07 22:16:10,472 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-11-07 22:16:10,472 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 144 transitions. [2018-11-07 22:16:10,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-11-07 22:16:10,473 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:16:10,473 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:16:10,473 INFO L423 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:16:10,473 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:16:10,473 INFO L82 PathProgramCache]: Analyzing trace with hash -1670517287, now seen corresponding path program 44 times [2018-11-07 22:16:10,473 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:16:10,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:10,474 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:16:10,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:10,474 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:16:10,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:11,662 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:11,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:11,663 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:16:11,663 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:16:11,663 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:16:11,663 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:11,663 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 22:16:11,672 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:16:11,672 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:16:11,717 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-11-07 22:16:11,717 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:16:11,720 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:16:11,742 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:11,743 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:16:13,856 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:13,875 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:16:13,875 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 92 [2018-11-07 22:16:13,875 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:16:13,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-11-07 22:16:13,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-11-07 22:16:13,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2018-11-07 22:16:13,877 INFO L87 Difference]: Start difference. First operand 144 states and 144 transitions. Second operand 47 states. [2018-11-07 22:16:14,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:16:14,005 INFO L93 Difference]: Finished difference Result 153 states and 153 transitions. [2018-11-07 22:16:14,005 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-11-07 22:16:14,006 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 143 [2018-11-07 22:16:14,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:16:14,007 INFO L225 Difference]: With dead ends: 153 [2018-11-07 22:16:14,007 INFO L226 Difference]: Without dead ends: 148 [2018-11-07 22:16:14,008 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 242 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2018-11-07 22:16:14,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-11-07 22:16:14,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2018-11-07 22:16:14,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-11-07 22:16:14,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 147 transitions. [2018-11-07 22:16:14,012 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 147 transitions. Word has length 143 [2018-11-07 22:16:14,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:16:14,012 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 147 transitions. [2018-11-07 22:16:14,012 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-11-07 22:16:14,013 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 147 transitions. [2018-11-07 22:16:14,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-11-07 22:16:14,013 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:16:14,013 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:16:14,014 INFO L423 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:16:14,014 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:16:14,014 INFO L82 PathProgramCache]: Analyzing trace with hash 132553053, now seen corresponding path program 45 times [2018-11-07 22:16:14,014 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:16:14,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:14,015 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:16:14,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:14,015 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:16:14,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:14,981 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:14,981 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:14,981 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:16:14,981 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:16:14,981 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:16:14,982 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:14,982 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 22:16:14,992 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:16:14,992 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:16:15,016 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:16:15,016 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:16:15,019 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:16:15,040 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:15,041 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:16:17,567 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:17,587 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:16:17,588 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 94 [2018-11-07 22:16:17,588 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:16:17,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-11-07 22:16:17,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-11-07 22:16:17,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4371, Invalid=4371, Unknown=0, NotChecked=0, Total=8742 [2018-11-07 22:16:17,590 INFO L87 Difference]: Start difference. First operand 147 states and 147 transitions. Second operand 48 states. [2018-11-07 22:16:17,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:16:17,726 INFO L93 Difference]: Finished difference Result 156 states and 156 transitions. [2018-11-07 22:16:17,726 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-11-07 22:16:17,726 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 146 [2018-11-07 22:16:17,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:16:17,727 INFO L225 Difference]: With dead ends: 156 [2018-11-07 22:16:17,728 INFO L226 Difference]: Without dead ends: 151 [2018-11-07 22:16:17,728 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 247 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4371, Invalid=4371, Unknown=0, NotChecked=0, Total=8742 [2018-11-07 22:16:17,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-11-07 22:16:17,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 150. [2018-11-07 22:16:17,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-11-07 22:16:17,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 150 transitions. [2018-11-07 22:16:17,732 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 150 transitions. Word has length 146 [2018-11-07 22:16:17,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:16:17,732 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 150 transitions. [2018-11-07 22:16:17,732 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-11-07 22:16:17,732 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 150 transitions. [2018-11-07 22:16:17,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-11-07 22:16:17,733 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:16:17,733 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:16:17,734 INFO L423 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:16:17,734 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:16:17,734 INFO L82 PathProgramCache]: Analyzing trace with hash -1754919079, now seen corresponding path program 46 times [2018-11-07 22:16:17,734 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:16:17,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:17,735 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:16:17,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:17,735 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:16:17,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:18,803 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:18,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:18,803 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:16:18,803 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:16:18,803 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:16:18,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:18,803 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 22:16:18,815 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:16:18,815 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:16:18,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:18,840 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:16:18,862 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:18,862 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:16:21,466 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:21,485 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:16:21,486 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 96 [2018-11-07 22:16:21,486 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:16:21,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-11-07 22:16:21,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-11-07 22:16:21,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2018-11-07 22:16:21,487 INFO L87 Difference]: Start difference. First operand 150 states and 150 transitions. Second operand 49 states. [2018-11-07 22:16:21,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:16:21,655 INFO L93 Difference]: Finished difference Result 159 states and 159 transitions. [2018-11-07 22:16:21,656 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-11-07 22:16:21,656 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 149 [2018-11-07 22:16:21,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:16:21,657 INFO L225 Difference]: With dead ends: 159 [2018-11-07 22:16:21,657 INFO L226 Difference]: Without dead ends: 154 [2018-11-07 22:16:21,658 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 252 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2018-11-07 22:16:21,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-11-07 22:16:21,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 153. [2018-11-07 22:16:21,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2018-11-07 22:16:21,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 153 transitions. [2018-11-07 22:16:21,662 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 153 transitions. Word has length 149 [2018-11-07 22:16:21,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:16:21,662 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 153 transitions. [2018-11-07 22:16:21,662 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-11-07 22:16:21,662 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 153 transitions. [2018-11-07 22:16:21,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2018-11-07 22:16:21,663 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:16:21,663 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:16:21,664 INFO L423 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:16:21,664 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:16:21,664 INFO L82 PathProgramCache]: Analyzing trace with hash -1725364259, now seen corresponding path program 47 times [2018-11-07 22:16:21,664 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:16:21,665 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:21,665 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:16:21,665 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:21,665 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:16:21,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:26,314 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:26,314 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:26,314 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:16:26,314 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:16:26,314 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:16:26,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:26,315 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 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 22:16:26,323 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:16:26,323 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:16:26,382 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-11-07 22:16:26,382 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:16:26,384 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:16:26,414 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:26,415 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:16:28,836 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:28,855 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:16:28,855 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 98 [2018-11-07 22:16:28,855 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:16:28,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-11-07 22:16:28,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-11-07 22:16:28,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2018-11-07 22:16:28,857 INFO L87 Difference]: Start difference. First operand 153 states and 153 transitions. Second operand 50 states. [2018-11-07 22:16:29,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:16:29,045 INFO L93 Difference]: Finished difference Result 162 states and 162 transitions. [2018-11-07 22:16:29,045 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-11-07 22:16:29,045 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 152 [2018-11-07 22:16:29,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:16:29,046 INFO L225 Difference]: With dead ends: 162 [2018-11-07 22:16:29,046 INFO L226 Difference]: Without dead ends: 157 [2018-11-07 22:16:29,047 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 257 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2018-11-07 22:16:29,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-11-07 22:16:29,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 156. [2018-11-07 22:16:29,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-11-07 22:16:29,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 156 transitions. [2018-11-07 22:16:29,051 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 156 transitions. Word has length 152 [2018-11-07 22:16:29,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:16:29,051 INFO L480 AbstractCegarLoop]: Abstraction has 156 states and 156 transitions. [2018-11-07 22:16:29,051 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-11-07 22:16:29,051 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 156 transitions. [2018-11-07 22:16:29,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-11-07 22:16:29,052 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:16:29,052 INFO L375 BasicCegarLoop]: trace histogram [49, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:16:29,053 INFO L423 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:16:29,053 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:16:29,053 INFO L82 PathProgramCache]: Analyzing trace with hash -1726017319, now seen corresponding path program 48 times [2018-11-07 22:16:29,053 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:16:29,054 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:29,054 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:16:29,054 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:29,054 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:16:29,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:30,250 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:30,250 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:30,250 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:16:30,250 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:16:30,250 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:16:30,250 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:30,250 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 22:16:30,259 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:16:30,259 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:16:30,283 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:16:30,283 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:16:30,286 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:16:30,309 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:30,310 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:16:32,976 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:32,996 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:16:32,996 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 100 [2018-11-07 22:16:32,996 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:16:32,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-11-07 22:16:32,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-11-07 22:16:32,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4950, Invalid=4950, Unknown=0, NotChecked=0, Total=9900 [2018-11-07 22:16:32,998 INFO L87 Difference]: Start difference. First operand 156 states and 156 transitions. Second operand 51 states. [2018-11-07 22:16:33,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:16:33,175 INFO L93 Difference]: Finished difference Result 165 states and 165 transitions. [2018-11-07 22:16:33,176 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-11-07 22:16:33,176 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 155 [2018-11-07 22:16:33,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:16:33,177 INFO L225 Difference]: With dead ends: 165 [2018-11-07 22:16:33,177 INFO L226 Difference]: Without dead ends: 160 [2018-11-07 22:16:33,177 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 262 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=4950, Invalid=4950, Unknown=0, NotChecked=0, Total=9900 [2018-11-07 22:16:33,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-11-07 22:16:33,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2018-11-07 22:16:33,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-11-07 22:16:33,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 159 transitions. [2018-11-07 22:16:33,180 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 159 transitions. Word has length 155 [2018-11-07 22:16:33,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:16:33,180 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 159 transitions. [2018-11-07 22:16:33,180 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-11-07 22:16:33,180 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 159 transitions. [2018-11-07 22:16:33,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-11-07 22:16:33,181 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:16:33,181 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:16:33,181 INFO L423 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:16:33,181 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:16:33,181 INFO L82 PathProgramCache]: Analyzing trace with hash 293508701, now seen corresponding path program 49 times [2018-11-07 22:16:33,181 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:16:33,182 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:33,182 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:16:33,182 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:33,182 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:16:33,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:34,189 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:34,190 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:34,190 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:16:34,190 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:16:34,190 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:16:34,190 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:34,190 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 22:16:34,199 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:16:34,199 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:16:34,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:34,228 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:16:34,252 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:34,252 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:16:37,170 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:37,189 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:16:37,190 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 102 [2018-11-07 22:16:37,190 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:16:37,190 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-11-07 22:16:37,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-11-07 22:16:37,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-11-07 22:16:37,192 INFO L87 Difference]: Start difference. First operand 159 states and 159 transitions. Second operand 52 states. [2018-11-07 22:16:37,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:16:37,341 INFO L93 Difference]: Finished difference Result 168 states and 168 transitions. [2018-11-07 22:16:37,341 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-11-07 22:16:37,342 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 158 [2018-11-07 22:16:37,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:16:37,343 INFO L225 Difference]: With dead ends: 168 [2018-11-07 22:16:37,344 INFO L226 Difference]: Without dead ends: 163 [2018-11-07 22:16:37,344 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 267 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-11-07 22:16:37,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-11-07 22:16:37,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 162. [2018-11-07 22:16:37,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-11-07 22:16:37,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 162 transitions. [2018-11-07 22:16:37,347 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 162 transitions. Word has length 158 [2018-11-07 22:16:37,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:16:37,348 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 162 transitions. [2018-11-07 22:16:37,348 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-11-07 22:16:37,348 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 162 transitions. [2018-11-07 22:16:37,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-11-07 22:16:37,349 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:16:37,349 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:16:37,349 INFO L423 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:16:37,349 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:16:37,350 INFO L82 PathProgramCache]: Analyzing trace with hash 91288153, now seen corresponding path program 50 times [2018-11-07 22:16:37,350 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:16:37,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:37,350 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:16:37,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:37,351 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:16:37,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:39,124 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:39,125 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:39,125 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:16:39,125 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:16:39,125 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:16:39,125 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:39,125 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 22:16:39,135 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:16:39,135 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:16:39,182 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2018-11-07 22:16:39,182 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:16:39,184 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:16:39,219 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:39,219 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:16:42,483 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:42,502 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:16:42,502 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 104 [2018-11-07 22:16:42,503 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:16:42,503 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-11-07 22:16:42,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-11-07 22:16:42,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5356, Invalid=5356, Unknown=0, NotChecked=0, Total=10712 [2018-11-07 22:16:42,505 INFO L87 Difference]: Start difference. First operand 162 states and 162 transitions. Second operand 53 states. [2018-11-07 22:16:42,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:16:42,696 INFO L93 Difference]: Finished difference Result 171 states and 171 transitions. [2018-11-07 22:16:42,697 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-11-07 22:16:42,697 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 161 [2018-11-07 22:16:42,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:16:42,698 INFO L225 Difference]: With dead ends: 171 [2018-11-07 22:16:42,699 INFO L226 Difference]: Without dead ends: 166 [2018-11-07 22:16:42,700 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 272 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=5356, Invalid=5356, Unknown=0, NotChecked=0, Total=10712 [2018-11-07 22:16:42,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-11-07 22:16:42,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 165. [2018-11-07 22:16:42,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-11-07 22:16:42,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 165 transitions. [2018-11-07 22:16:42,703 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 165 transitions. Word has length 161 [2018-11-07 22:16:42,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:16:42,704 INFO L480 AbstractCegarLoop]: Abstraction has 165 states and 165 transitions. [2018-11-07 22:16:42,704 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-11-07 22:16:42,704 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 165 transitions. [2018-11-07 22:16:42,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-11-07 22:16:42,704 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:16:42,705 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:16:42,705 INFO L423 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:16:42,705 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:16:42,705 INFO L82 PathProgramCache]: Analyzing trace with hash 1578058973, now seen corresponding path program 51 times [2018-11-07 22:16:42,705 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:16:42,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:42,706 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:16:42,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:42,706 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:16:42,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:44,057 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:44,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:44,058 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:16:44,058 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:16:44,058 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:16:44,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:44,059 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 22:16:44,067 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:16:44,067 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:16:44,090 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:16:44,090 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:16:44,094 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:16:44,127 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:44,127 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:16:47,199 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:47,218 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:16:47,218 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 106 [2018-11-07 22:16:47,218 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:16:47,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-11-07 22:16:47,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-11-07 22:16:47,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5565, Invalid=5565, Unknown=0, NotChecked=0, Total=11130 [2018-11-07 22:16:47,220 INFO L87 Difference]: Start difference. First operand 165 states and 165 transitions. Second operand 54 states. [2018-11-07 22:16:47,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:16:47,397 INFO L93 Difference]: Finished difference Result 174 states and 174 transitions. [2018-11-07 22:16:47,397 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-11-07 22:16:47,397 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 164 [2018-11-07 22:16:47,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:16:47,398 INFO L225 Difference]: With dead ends: 174 [2018-11-07 22:16:47,398 INFO L226 Difference]: Without dead ends: 169 [2018-11-07 22:16:47,399 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 277 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=5565, Invalid=5565, Unknown=0, NotChecked=0, Total=11130 [2018-11-07 22:16:47,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-11-07 22:16:47,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 168. [2018-11-07 22:16:47,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-11-07 22:16:47,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 168 transitions. [2018-11-07 22:16:47,401 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 168 transitions. Word has length 164 [2018-11-07 22:16:47,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:16:47,401 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 168 transitions. [2018-11-07 22:16:47,402 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-11-07 22:16:47,402 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 168 transitions. [2018-11-07 22:16:47,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-11-07 22:16:47,402 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:16:47,402 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:16:47,403 INFO L423 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:16:47,403 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:16:47,403 INFO L82 PathProgramCache]: Analyzing trace with hash -30166055, now seen corresponding path program 52 times [2018-11-07 22:16:47,403 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:16:47,403 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:47,404 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:16:47,404 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:47,404 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:16:47,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:49,154 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:49,155 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:49,155 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:16:49,155 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:16:49,155 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:16:49,155 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:49,155 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 22:16:49,163 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:16:49,163 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:16:49,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:49,192 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:16:49,228 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:49,229 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:16:52,435 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:52,455 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:16:52,456 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 108 [2018-11-07 22:16:52,456 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:16:52,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-11-07 22:16:52,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-11-07 22:16:52,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5778, Invalid=5778, Unknown=0, NotChecked=0, Total=11556 [2018-11-07 22:16:52,458 INFO L87 Difference]: Start difference. First operand 168 states and 168 transitions. Second operand 55 states. [2018-11-07 22:16:52,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:16:52,656 INFO L93 Difference]: Finished difference Result 177 states and 177 transitions. [2018-11-07 22:16:52,656 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-11-07 22:16:52,656 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 167 [2018-11-07 22:16:52,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:16:52,657 INFO L225 Difference]: With dead ends: 177 [2018-11-07 22:16:52,657 INFO L226 Difference]: Without dead ends: 172 [2018-11-07 22:16:52,658 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 282 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=5778, Invalid=5778, Unknown=0, NotChecked=0, Total=11556 [2018-11-07 22:16:52,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-11-07 22:16:52,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 171. [2018-11-07 22:16:52,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-11-07 22:16:52,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 171 transitions. [2018-11-07 22:16:52,660 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 171 transitions. Word has length 167 [2018-11-07 22:16:52,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:16:52,661 INFO L480 AbstractCegarLoop]: Abstraction has 171 states and 171 transitions. [2018-11-07 22:16:52,661 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-11-07 22:16:52,661 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 171 transitions. [2018-11-07 22:16:52,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-11-07 22:16:52,662 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:16:52,662 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:16:52,662 INFO L423 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:16:52,662 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:16:52,663 INFO L82 PathProgramCache]: Analyzing trace with hash -301788323, now seen corresponding path program 53 times [2018-11-07 22:16:52,663 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:16:52,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:52,663 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:16:52,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:52,664 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:16:52,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:56,497 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:56,497 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:56,497 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:16:56,498 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:16:56,498 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:16:56,498 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:56,498 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 22:16:56,506 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:16:56,506 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:16:56,558 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2018-11-07 22:16:56,559 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:16:56,561 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:16:56,589 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:56,589 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:16:59,850 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:59,870 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:16:59,870 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 110 [2018-11-07 22:16:59,870 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:16:59,871 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-11-07 22:16:59,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-11-07 22:16:59,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5995, Invalid=5995, Unknown=0, NotChecked=0, Total=11990 [2018-11-07 22:16:59,872 INFO L87 Difference]: Start difference. First operand 171 states and 171 transitions. Second operand 56 states. [2018-11-07 22:17:00,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:00,035 INFO L93 Difference]: Finished difference Result 180 states and 180 transitions. [2018-11-07 22:17:00,035 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-11-07 22:17:00,035 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 170 [2018-11-07 22:17:00,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:00,037 INFO L225 Difference]: With dead ends: 180 [2018-11-07 22:17:00,037 INFO L226 Difference]: Without dead ends: 175 [2018-11-07 22:17:00,038 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 287 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=5995, Invalid=5995, Unknown=0, NotChecked=0, Total=11990 [2018-11-07 22:17:00,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-11-07 22:17:00,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 174. [2018-11-07 22:17:00,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-11-07 22:17:00,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 174 transitions. [2018-11-07 22:17:00,041 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 174 transitions. Word has length 170 [2018-11-07 22:17:00,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:00,041 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 174 transitions. [2018-11-07 22:17:00,041 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-11-07 22:17:00,041 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 174 transitions. [2018-11-07 22:17:00,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-11-07 22:17:00,042 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:00,042 INFO L375 BasicCegarLoop]: trace histogram [55, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:00,042 INFO L423 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:00,042 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:00,043 INFO L82 PathProgramCache]: Analyzing trace with hash -482388647, now seen corresponding path program 54 times [2018-11-07 22:17:00,043 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:00,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:00,043 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:00,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:00,043 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:00,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:03,179 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:03,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:03,180 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:03,180 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:03,180 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:03,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:03,180 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 22:17:03,189 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:17:03,189 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:17:03,231 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:17:03,231 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:03,235 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:03,276 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:03,276 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:06,592 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:06,612 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:06,612 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 112 [2018-11-07 22:17:06,613 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:06,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-11-07 22:17:06,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-11-07 22:17:06,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6216, Invalid=6216, Unknown=0, NotChecked=0, Total=12432 [2018-11-07 22:17:06,614 INFO L87 Difference]: Start difference. First operand 174 states and 174 transitions. Second operand 57 states. [2018-11-07 22:17:06,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:06,813 INFO L93 Difference]: Finished difference Result 183 states and 183 transitions. [2018-11-07 22:17:06,814 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-11-07 22:17:06,814 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 173 [2018-11-07 22:17:06,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:06,815 INFO L225 Difference]: With dead ends: 183 [2018-11-07 22:17:06,815 INFO L226 Difference]: Without dead ends: 178 [2018-11-07 22:17:06,816 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 292 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=6216, Invalid=6216, Unknown=0, NotChecked=0, Total=12432 [2018-11-07 22:17:06,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-11-07 22:17:06,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 177. [2018-11-07 22:17:06,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-11-07 22:17:06,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 177 transitions. [2018-11-07 22:17:06,820 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 177 transitions. Word has length 173 [2018-11-07 22:17:06,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:06,820 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 177 transitions. [2018-11-07 22:17:06,820 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-11-07 22:17:06,820 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 177 transitions. [2018-11-07 22:17:06,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-11-07 22:17:06,821 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:06,821 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:06,821 INFO L423 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:06,821 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:06,821 INFO L82 PathProgramCache]: Analyzing trace with hash 847380957, now seen corresponding path program 55 times [2018-11-07 22:17:06,821 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:06,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:06,822 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:06,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:06,822 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:06,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:09,827 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:09,827 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:09,827 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:09,828 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:09,828 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:09,828 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:09,828 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 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 22:17:09,835 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:09,836 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:17:09,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:09,867 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:09,907 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:09,908 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:13,450 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:13,470 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:13,471 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 114 [2018-11-07 22:17:13,471 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:13,471 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-11-07 22:17:13,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-11-07 22:17:13,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6441, Invalid=6441, Unknown=0, NotChecked=0, Total=12882 [2018-11-07 22:17:13,472 INFO L87 Difference]: Start difference. First operand 177 states and 177 transitions. Second operand 58 states. [2018-11-07 22:17:13,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:13,701 INFO L93 Difference]: Finished difference Result 186 states and 186 transitions. [2018-11-07 22:17:13,701 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-11-07 22:17:13,701 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 176 [2018-11-07 22:17:13,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:13,702 INFO L225 Difference]: With dead ends: 186 [2018-11-07 22:17:13,702 INFO L226 Difference]: Without dead ends: 181 [2018-11-07 22:17:13,703 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 297 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=6441, Invalid=6441, Unknown=0, NotChecked=0, Total=12882 [2018-11-07 22:17:13,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-11-07 22:17:13,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 180. [2018-11-07 22:17:13,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-11-07 22:17:13,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 180 transitions. [2018-11-07 22:17:13,707 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 180 transitions. Word has length 176 [2018-11-07 22:17:13,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:13,707 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 180 transitions. [2018-11-07 22:17:13,707 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-11-07 22:17:13,707 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 180 transitions. [2018-11-07 22:17:13,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-11-07 22:17:13,708 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:13,708 INFO L375 BasicCegarLoop]: trace histogram [57, 56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:13,709 INFO L423 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:13,709 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:13,709 INFO L82 PathProgramCache]: Analyzing trace with hash -764684583, now seen corresponding path program 56 times [2018-11-07 22:17:13,709 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:13,709 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:13,710 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:13,710 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:13,710 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:13,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:15,521 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:15,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:15,522 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:15,522 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:15,522 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:15,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:15,522 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 22:17:15,530 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:17:15,531 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:17:15,582 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2018-11-07 22:17:15,583 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:15,585 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:15,614 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:15,615 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:19,267 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:19,286 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:19,286 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 116 [2018-11-07 22:17:19,286 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:19,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-11-07 22:17:19,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-11-07 22:17:19,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6670, Invalid=6670, Unknown=0, NotChecked=0, Total=13340 [2018-11-07 22:17:19,288 INFO L87 Difference]: Start difference. First operand 180 states and 180 transitions. Second operand 59 states. [2018-11-07 22:17:19,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:19,518 INFO L93 Difference]: Finished difference Result 189 states and 189 transitions. [2018-11-07 22:17:19,518 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-11-07 22:17:19,518 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 179 [2018-11-07 22:17:19,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:19,519 INFO L225 Difference]: With dead ends: 189 [2018-11-07 22:17:19,520 INFO L226 Difference]: Without dead ends: 184 [2018-11-07 22:17:19,521 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 302 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=6670, Invalid=6670, Unknown=0, NotChecked=0, Total=13340 [2018-11-07 22:17:19,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-11-07 22:17:19,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 183. [2018-11-07 22:17:19,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-11-07 22:17:19,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 183 transitions. [2018-11-07 22:17:19,525 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 183 transitions. Word has length 179 [2018-11-07 22:17:19,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:19,525 INFO L480 AbstractCegarLoop]: Abstraction has 183 states and 183 transitions. [2018-11-07 22:17:19,525 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-11-07 22:17:19,525 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 183 transitions. [2018-11-07 22:17:19,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-11-07 22:17:19,526 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:19,526 INFO L375 BasicCegarLoop]: trace histogram [58, 57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:19,527 INFO L423 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:19,527 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:19,527 INFO L82 PathProgramCache]: Analyzing trace with hash 515117149, now seen corresponding path program 57 times [2018-11-07 22:17:19,527 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:19,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:19,528 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:19,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:19,528 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:19,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:20,850 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:20,850 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:20,851 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:20,851 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:20,851 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:20,851 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:20,851 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 22:17:20,859 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:17:20,859 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:17:20,895 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:17:20,895 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:20,897 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:20,942 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:20,942 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:24,716 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:24,735 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:24,735 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 118 [2018-11-07 22:17:24,735 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:24,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-11-07 22:17:24,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-11-07 22:17:24,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6903, Invalid=6903, Unknown=0, NotChecked=0, Total=13806 [2018-11-07 22:17:24,737 INFO L87 Difference]: Start difference. First operand 183 states and 183 transitions. Second operand 60 states. [2018-11-07 22:17:24,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:24,959 INFO L93 Difference]: Finished difference Result 192 states and 192 transitions. [2018-11-07 22:17:24,960 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-11-07 22:17:24,960 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 182 [2018-11-07 22:17:24,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:24,964 INFO L225 Difference]: With dead ends: 192 [2018-11-07 22:17:24,964 INFO L226 Difference]: Without dead ends: 187 [2018-11-07 22:17:24,965 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 307 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=6903, Invalid=6903, Unknown=0, NotChecked=0, Total=13806 [2018-11-07 22:17:24,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-11-07 22:17:24,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 186. [2018-11-07 22:17:24,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-11-07 22:17:24,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 186 transitions. [2018-11-07 22:17:24,968 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 186 transitions. Word has length 182 [2018-11-07 22:17:24,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:24,969 INFO L480 AbstractCegarLoop]: Abstraction has 186 states and 186 transitions. [2018-11-07 22:17:24,969 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-11-07 22:17:24,969 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 186 transitions. [2018-11-07 22:17:24,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-11-07 22:17:24,970 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:24,970 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:24,970 INFO L423 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:24,970 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:24,970 INFO L82 PathProgramCache]: Analyzing trace with hash 663828569, now seen corresponding path program 58 times [2018-11-07 22:17:24,971 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:24,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:24,971 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:24,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:24,971 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:24,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:26,442 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:26,443 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:26,443 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:26,443 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:26,443 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:26,443 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:26,443 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 22:17:26,452 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:26,452 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:17:26,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:26,493 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:26,535 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:26,536 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:30,746 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:30,766 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:30,766 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 120 [2018-11-07 22:17:30,766 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:30,766 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-11-07 22:17:30,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-11-07 22:17:30,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7140, Invalid=7140, Unknown=0, NotChecked=0, Total=14280 [2018-11-07 22:17:30,767 INFO L87 Difference]: Start difference. First operand 186 states and 186 transitions. Second operand 61 states. [2018-11-07 22:17:30,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:30,977 INFO L93 Difference]: Finished difference Result 195 states and 195 transitions. [2018-11-07 22:17:30,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-11-07 22:17:30,978 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 185 [2018-11-07 22:17:30,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:30,979 INFO L225 Difference]: With dead ends: 195 [2018-11-07 22:17:30,980 INFO L226 Difference]: Without dead ends: 190 [2018-11-07 22:17:30,981 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 312 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=7140, Invalid=7140, Unknown=0, NotChecked=0, Total=14280 [2018-11-07 22:17:30,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-11-07 22:17:30,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 189. [2018-11-07 22:17:30,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-11-07 22:17:30,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 189 transitions. [2018-11-07 22:17:30,984 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 189 transitions. Word has length 185 [2018-11-07 22:17:30,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:30,984 INFO L480 AbstractCegarLoop]: Abstraction has 189 states and 189 transitions. [2018-11-07 22:17:30,985 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-11-07 22:17:30,985 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 189 transitions. [2018-11-07 22:17:30,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-11-07 22:17:30,986 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:30,986 INFO L375 BasicCegarLoop]: trace histogram [60, 59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:30,986 INFO L423 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:30,986 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:30,986 INFO L82 PathProgramCache]: Analyzing trace with hash -1480507683, now seen corresponding path program 59 times [2018-11-07 22:17:30,987 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:30,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:30,987 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:30,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:30,987 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:30,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:32,350 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:32,350 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:32,350 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:32,350 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:32,350 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:32,350 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:32,350 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 22:17:32,358 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:17:32,358 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:17:32,413 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2018-11-07 22:17:32,414 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:32,418 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:32,462 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:32,463 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:36,707 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:36,727 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:36,727 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 122 [2018-11-07 22:17:36,727 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:36,727 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-11-07 22:17:36,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-11-07 22:17:36,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7381, Invalid=7381, Unknown=0, NotChecked=0, Total=14762 [2018-11-07 22:17:36,729 INFO L87 Difference]: Start difference. First operand 189 states and 189 transitions. Second operand 62 states. [2018-11-07 22:17:36,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:36,973 INFO L93 Difference]: Finished difference Result 198 states and 198 transitions. [2018-11-07 22:17:36,973 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-11-07 22:17:36,974 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 188 [2018-11-07 22:17:36,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:36,975 INFO L225 Difference]: With dead ends: 198 [2018-11-07 22:17:36,975 INFO L226 Difference]: Without dead ends: 193 [2018-11-07 22:17:36,976 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 317 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=7381, Invalid=7381, Unknown=0, NotChecked=0, Total=14762 [2018-11-07 22:17:36,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-11-07 22:17:36,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 192. [2018-11-07 22:17:36,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-11-07 22:17:36,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 192 transitions. [2018-11-07 22:17:36,979 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 192 transitions. Word has length 188 [2018-11-07 22:17:36,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:36,979 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 192 transitions. [2018-11-07 22:17:36,979 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-11-07 22:17:36,979 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 192 transitions. [2018-11-07 22:17:36,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-11-07 22:17:36,980 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:36,980 INFO L375 BasicCegarLoop]: trace histogram [61, 60, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:36,980 INFO L423 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:36,980 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:36,980 INFO L82 PathProgramCache]: Analyzing trace with hash -58230311, now seen corresponding path program 60 times [2018-11-07 22:17:36,980 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:36,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:36,981 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:36,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:36,981 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:36,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:38,647 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:38,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:38,647 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:38,647 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:38,647 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:38,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:38,648 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 22:17:38,657 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:17:38,657 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:17:38,684 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:17:38,684 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:38,688 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:38,721 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:38,721 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:42,485 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:42,505 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:42,505 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 124 [2018-11-07 22:17:42,506 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:42,506 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-11-07 22:17:42,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-11-07 22:17:42,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7626, Invalid=7626, Unknown=0, NotChecked=0, Total=15252 [2018-11-07 22:17:42,507 INFO L87 Difference]: Start difference. First operand 192 states and 192 transitions. Second operand 63 states. [2018-11-07 22:17:43,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:43,725 INFO L93 Difference]: Finished difference Result 201 states and 201 transitions. [2018-11-07 22:17:43,726 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-11-07 22:17:43,726 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 191 [2018-11-07 22:17:43,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:43,727 INFO L225 Difference]: With dead ends: 201 [2018-11-07 22:17:43,727 INFO L226 Difference]: Without dead ends: 196 [2018-11-07 22:17:43,728 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 322 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=7626, Invalid=7626, Unknown=0, NotChecked=0, Total=15252 [2018-11-07 22:17:43,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-11-07 22:17:43,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 195. [2018-11-07 22:17:43,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2018-11-07 22:17:43,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 195 transitions. [2018-11-07 22:17:43,734 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 195 transitions. Word has length 191 [2018-11-07 22:17:43,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:43,734 INFO L480 AbstractCegarLoop]: Abstraction has 195 states and 195 transitions. [2018-11-07 22:17:43,734 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-11-07 22:17:43,735 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 195 transitions. [2018-11-07 22:17:43,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-11-07 22:17:43,736 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:43,736 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:43,736 INFO L423 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:43,736 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:43,736 INFO L82 PathProgramCache]: Analyzing trace with hash 1154583901, now seen corresponding path program 61 times [2018-11-07 22:17:43,737 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:43,737 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:43,737 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:43,737 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:43,737 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:43,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:45,443 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:45,443 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:45,443 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:45,444 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:45,444 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:45,444 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:45,444 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 22:17:45,453 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:45,453 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:17:45,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:45,487 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:45,520 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:45,520 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:49,679 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:49,698 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:49,698 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 126 [2018-11-07 22:17:49,698 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:49,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-11-07 22:17:49,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-11-07 22:17:49,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7875, Invalid=7875, Unknown=0, NotChecked=0, Total=15750 [2018-11-07 22:17:49,700 INFO L87 Difference]: Start difference. First operand 195 states and 195 transitions. Second operand 64 states. [2018-11-07 22:17:49,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:49,970 INFO L93 Difference]: Finished difference Result 204 states and 204 transitions. [2018-11-07 22:17:49,970 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-11-07 22:17:49,970 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 194 [2018-11-07 22:17:49,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:49,971 INFO L225 Difference]: With dead ends: 204 [2018-11-07 22:17:49,971 INFO L226 Difference]: Without dead ends: 199 [2018-11-07 22:17:49,972 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 451 GetRequests, 327 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=7875, Invalid=7875, Unknown=0, NotChecked=0, Total=15750 [2018-11-07 22:17:49,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-11-07 22:17:49,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 198. [2018-11-07 22:17:49,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-11-07 22:17:49,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 198 transitions. [2018-11-07 22:17:49,975 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 198 transitions. Word has length 194 [2018-11-07 22:17:49,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:49,976 INFO L480 AbstractCegarLoop]: Abstraction has 198 states and 198 transitions. [2018-11-07 22:17:49,976 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-11-07 22:17:49,976 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 198 transitions. [2018-11-07 22:17:49,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-11-07 22:17:49,977 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:49,977 INFO L375 BasicCegarLoop]: trace histogram [63, 62, 62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:49,977 INFO L423 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:49,978 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:49,978 INFO L82 PathProgramCache]: Analyzing trace with hash -1457087655, now seen corresponding path program 62 times [2018-11-07 22:17:49,978 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:49,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:49,979 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:49,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:49,979 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:49,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:51,433 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:51,433 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:51,434 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:51,434 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:51,434 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:51,434 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:51,434 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 22:17:51,443 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:17:51,443 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:17:51,503 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 63 check-sat command(s) [2018-11-07 22:17:51,503 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:51,506 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:51,550 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:51,551 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:55,855 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:55,874 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:55,874 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 128 [2018-11-07 22:17:55,874 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:55,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-11-07 22:17:55,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-11-07 22:17:55,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8128, Invalid=8128, Unknown=0, NotChecked=0, Total=16256 [2018-11-07 22:17:55,876 INFO L87 Difference]: Start difference. First operand 198 states and 198 transitions. Second operand 65 states. [2018-11-07 22:17:56,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:56,160 INFO L93 Difference]: Finished difference Result 207 states and 207 transitions. [2018-11-07 22:17:56,160 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-11-07 22:17:56,161 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 197 [2018-11-07 22:17:56,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:56,162 INFO L225 Difference]: With dead ends: 207 [2018-11-07 22:17:56,162 INFO L226 Difference]: Without dead ends: 202 [2018-11-07 22:17:56,163 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 332 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=8128, Invalid=8128, Unknown=0, NotChecked=0, Total=16256 [2018-11-07 22:17:56,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2018-11-07 22:17:56,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 201. [2018-11-07 22:17:56,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2018-11-07 22:17:56,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 201 transitions. [2018-11-07 22:17:56,167 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 201 transitions. Word has length 197 [2018-11-07 22:17:56,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:56,167 INFO L480 AbstractCegarLoop]: Abstraction has 201 states and 201 transitions. [2018-11-07 22:17:56,167 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-11-07 22:17:56,168 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 201 transitions. [2018-11-07 22:17:56,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2018-11-07 22:17:56,170 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:56,170 INFO L375 BasicCegarLoop]: trace histogram [64, 63, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:56,171 INFO L423 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:56,171 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:56,171 INFO L82 PathProgramCache]: Analyzing trace with hash 1863121885, now seen corresponding path program 63 times [2018-11-07 22:17:56,171 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:56,172 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:56,172 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:56,172 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:56,172 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:56,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:57,728 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:57,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:57,728 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:57,728 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:57,728 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:57,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:57,729 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 22:17:57,737 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:17:57,737 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:17:57,767 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:17:57,767 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:57,771 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:57,819 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:57,820 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:02,860 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:02,878 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:02,879 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 130 [2018-11-07 22:18:02,879 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:02,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-11-07 22:18:02,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-11-07 22:18:02,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8385, Invalid=8385, Unknown=0, NotChecked=0, Total=16770 [2018-11-07 22:18:02,880 INFO L87 Difference]: Start difference. First operand 201 states and 201 transitions. Second operand 66 states. [2018-11-07 22:18:03,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:03,151 INFO L93 Difference]: Finished difference Result 210 states and 210 transitions. [2018-11-07 22:18:03,151 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-11-07 22:18:03,151 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 200 [2018-11-07 22:18:03,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:03,152 INFO L225 Difference]: With dead ends: 210 [2018-11-07 22:18:03,152 INFO L226 Difference]: Without dead ends: 205 [2018-11-07 22:18:03,153 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 337 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=8385, Invalid=8385, Unknown=0, NotChecked=0, Total=16770 [2018-11-07 22:18:03,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-11-07 22:18:03,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 204. [2018-11-07 22:18:03,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2018-11-07 22:18:03,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 204 transitions. [2018-11-07 22:18:03,156 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 204 transitions. Word has length 200 [2018-11-07 22:18:03,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:03,157 INFO L480 AbstractCegarLoop]: Abstraction has 204 states and 204 transitions. [2018-11-07 22:18:03,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-11-07 22:18:03,157 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 204 transitions. [2018-11-07 22:18:03,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2018-11-07 22:18:03,158 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:03,158 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:03,158 INFO L423 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:03,158 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:03,159 INFO L82 PathProgramCache]: Analyzing trace with hash 1128701145, now seen corresponding path program 64 times [2018-11-07 22:18:03,159 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:03,159 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:03,159 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:18:03,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:03,160 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:03,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:05,015 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:05,015 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:05,015 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:05,015 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:05,015 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:05,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:05,016 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 22:18:05,024 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:05,024 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:18:05,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:05,059 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:05,108 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:05,108 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:09,661 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:09,680 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:09,680 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 132 [2018-11-07 22:18:09,680 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:09,681 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-11-07 22:18:09,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-11-07 22:18:09,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8646, Invalid=8646, Unknown=0, NotChecked=0, Total=17292 [2018-11-07 22:18:09,682 INFO L87 Difference]: Start difference. First operand 204 states and 204 transitions. Second operand 67 states. [2018-11-07 22:18:09,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:09,895 INFO L93 Difference]: Finished difference Result 213 states and 213 transitions. [2018-11-07 22:18:09,895 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-11-07 22:18:09,895 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 203 [2018-11-07 22:18:09,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:09,896 INFO L225 Difference]: With dead ends: 213 [2018-11-07 22:18:09,896 INFO L226 Difference]: Without dead ends: 208 [2018-11-07 22:18:09,897 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=8646, Invalid=8646, Unknown=0, NotChecked=0, Total=17292 [2018-11-07 22:18:09,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2018-11-07 22:18:09,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 207. [2018-11-07 22:18:09,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-11-07 22:18:09,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 207 transitions. [2018-11-07 22:18:09,901 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 207 transitions. Word has length 203 [2018-11-07 22:18:09,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:09,901 INFO L480 AbstractCegarLoop]: Abstraction has 207 states and 207 transitions. [2018-11-07 22:18:09,901 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-11-07 22:18:09,902 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 207 transitions. [2018-11-07 22:18:09,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-11-07 22:18:09,903 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:09,903 INFO L375 BasicCegarLoop]: trace histogram [66, 65, 65, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:09,903 INFO L423 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:09,903 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:09,903 INFO L82 PathProgramCache]: Analyzing trace with hash 563841629, now seen corresponding path program 65 times [2018-11-07 22:18:09,903 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:09,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:09,904 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:09,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:09,904 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:09,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:11,466 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:11,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:11,466 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:11,466 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:11,466 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:11,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:11,467 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 22:18:11,475 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:18:11,475 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:18:11,550 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 66 check-sat command(s) [2018-11-07 22:18:11,550 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:18:11,553 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:11,590 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:11,590 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:16,202 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:16,221 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:16,221 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 134 [2018-11-07 22:18:16,221 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:16,221 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-11-07 22:18:16,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-11-07 22:18:16,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8911, Invalid=8911, Unknown=0, NotChecked=0, Total=17822 [2018-11-07 22:18:16,223 INFO L87 Difference]: Start difference. First operand 207 states and 207 transitions. Second operand 68 states. [2018-11-07 22:18:16,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:16,437 INFO L93 Difference]: Finished difference Result 216 states and 216 transitions. [2018-11-07 22:18:16,437 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-11-07 22:18:16,437 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 206 [2018-11-07 22:18:16,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:16,439 INFO L225 Difference]: With dead ends: 216 [2018-11-07 22:18:16,439 INFO L226 Difference]: Without dead ends: 211 [2018-11-07 22:18:16,440 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 347 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=8911, Invalid=8911, Unknown=0, NotChecked=0, Total=17822 [2018-11-07 22:18:16,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2018-11-07 22:18:16,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 210. [2018-11-07 22:18:16,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-11-07 22:18:16,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 210 transitions. [2018-11-07 22:18:16,444 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 210 transitions. Word has length 206 [2018-11-07 22:18:16,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:16,444 INFO L480 AbstractCegarLoop]: Abstraction has 210 states and 210 transitions. [2018-11-07 22:18:16,444 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-11-07 22:18:16,445 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 210 transitions. [2018-11-07 22:18:16,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-11-07 22:18:16,446 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:16,446 INFO L375 BasicCegarLoop]: trace histogram [67, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:16,446 INFO L423 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:16,446 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:16,446 INFO L82 PathProgramCache]: Analyzing trace with hash 515866201, now seen corresponding path program 66 times [2018-11-07 22:18:16,446 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:16,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:16,447 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:18:16,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:16,447 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:16,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:18,061 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:18,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:18,061 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:18,061 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:18,061 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:18,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:18,062 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 22:18:18,069 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:18:18,069 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:18:18,102 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:18:18,102 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:18:18,106 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:18,144 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:18,145 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:22,995 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:23,016 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:23,016 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 136 [2018-11-07 22:18:23,016 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:23,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-11-07 22:18:23,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-11-07 22:18:23,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9180, Invalid=9180, Unknown=0, NotChecked=0, Total=18360 [2018-11-07 22:18:23,018 INFO L87 Difference]: Start difference. First operand 210 states and 210 transitions. Second operand 69 states. [2018-11-07 22:18:23,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:23,268 INFO L93 Difference]: Finished difference Result 219 states and 219 transitions. [2018-11-07 22:18:23,268 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-11-07 22:18:23,268 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 209 [2018-11-07 22:18:23,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:23,269 INFO L225 Difference]: With dead ends: 219 [2018-11-07 22:18:23,269 INFO L226 Difference]: Without dead ends: 214 [2018-11-07 22:18:23,270 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 352 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=9180, Invalid=9180, Unknown=0, NotChecked=0, Total=18360 [2018-11-07 22:18:23,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-11-07 22:18:23,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 213. [2018-11-07 22:18:23,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2018-11-07 22:18:23,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 213 transitions. [2018-11-07 22:18:23,273 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 213 transitions. Word has length 209 [2018-11-07 22:18:23,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:23,274 INFO L480 AbstractCegarLoop]: Abstraction has 213 states and 213 transitions. [2018-11-07 22:18:23,274 INFO L481 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-11-07 22:18:23,274 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 213 transitions. [2018-11-07 22:18:23,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2018-11-07 22:18:23,275 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:23,275 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:23,275 INFO L423 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:23,275 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:23,276 INFO L82 PathProgramCache]: Analyzing trace with hash 1504000221, now seen corresponding path program 67 times [2018-11-07 22:18:23,276 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:23,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:23,276 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:18:23,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:23,277 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:23,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:25,451 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:25,452 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:25,452 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:25,452 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:25,452 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:25,452 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:25,452 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 22:18:25,462 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:25,462 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:18:25,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:25,496 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:25,548 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:25,548 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:30,408 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:30,427 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:30,428 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 138 [2018-11-07 22:18:30,428 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:30,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-11-07 22:18:30,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-11-07 22:18:30,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9453, Invalid=9453, Unknown=0, NotChecked=0, Total=18906 [2018-11-07 22:18:30,430 INFO L87 Difference]: Start difference. First operand 213 states and 213 transitions. Second operand 70 states. [2018-11-07 22:18:30,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:30,721 INFO L93 Difference]: Finished difference Result 222 states and 222 transitions. [2018-11-07 22:18:30,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-11-07 22:18:30,721 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 212 [2018-11-07 22:18:30,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:30,722 INFO L225 Difference]: With dead ends: 222 [2018-11-07 22:18:30,722 INFO L226 Difference]: Without dead ends: 217 [2018-11-07 22:18:30,723 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 357 SyntacticMatches, 0 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=9453, Invalid=9453, Unknown=0, NotChecked=0, Total=18906 [2018-11-07 22:18:30,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2018-11-07 22:18:30,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 216. [2018-11-07 22:18:30,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2018-11-07 22:18:30,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 216 transitions. [2018-11-07 22:18:30,727 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 216 transitions. Word has length 212 [2018-11-07 22:18:30,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:30,727 INFO L480 AbstractCegarLoop]: Abstraction has 216 states and 216 transitions. [2018-11-07 22:18:30,727 INFO L481 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-11-07 22:18:30,727 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 216 transitions. [2018-11-07 22:18:30,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2018-11-07 22:18:30,728 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:30,729 INFO L375 BasicCegarLoop]: trace histogram [69, 68, 68, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:30,729 INFO L423 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:30,729 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:30,729 INFO L82 PathProgramCache]: Analyzing trace with hash 1298743257, now seen corresponding path program 68 times [2018-11-07 22:18:30,729 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:30,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:30,730 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:30,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:30,730 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:30,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:32,478 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:32,478 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:32,478 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:32,478 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:32,479 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:32,479 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:32,479 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 22:18:32,487 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:18:32,488 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:18:32,555 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2018-11-07 22:18:32,556 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:18:32,559 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:32,599 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:32,600 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:37,786 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:37,805 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:37,806 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 140 [2018-11-07 22:18:37,806 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:37,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-11-07 22:18:37,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-11-07 22:18:37,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9730, Invalid=9730, Unknown=0, NotChecked=0, Total=19460 [2018-11-07 22:18:37,807 INFO L87 Difference]: Start difference. First operand 216 states and 216 transitions. Second operand 71 states. [2018-11-07 22:18:38,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:38,057 INFO L93 Difference]: Finished difference Result 225 states and 225 transitions. [2018-11-07 22:18:38,057 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-11-07 22:18:38,057 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 215 [2018-11-07 22:18:38,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:38,058 INFO L225 Difference]: With dead ends: 225 [2018-11-07 22:18:38,058 INFO L226 Difference]: Without dead ends: 220 [2018-11-07 22:18:38,059 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 362 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=9730, Invalid=9730, Unknown=0, NotChecked=0, Total=19460 [2018-11-07 22:18:38,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-11-07 22:18:38,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 219. [2018-11-07 22:18:38,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2018-11-07 22:18:38,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 219 transitions. [2018-11-07 22:18:38,063 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 219 transitions. Word has length 215 [2018-11-07 22:18:38,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:38,063 INFO L480 AbstractCegarLoop]: Abstraction has 219 states and 219 transitions. [2018-11-07 22:18:38,063 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-11-07 22:18:38,064 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 219 transitions. [2018-11-07 22:18:38,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2018-11-07 22:18:38,064 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:38,064 INFO L375 BasicCegarLoop]: trace histogram [70, 69, 69, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:38,065 INFO L423 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:38,065 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:38,065 INFO L82 PathProgramCache]: Analyzing trace with hash -1773009059, now seen corresponding path program 69 times [2018-11-07 22:18:38,065 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:38,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:38,066 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:18:38,066 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:38,066 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:38,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:40,169 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:40,169 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:40,170 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:40,170 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:40,170 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:40,170 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:40,170 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 22:18:40,179 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:18:40,179 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:18:40,210 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:18:40,210 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:18:40,215 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:40,254 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:40,254 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-11-07 22:18:42,974 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-11-07 22:18:43,175 WARN L521 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:18:43,175 WARN L549 AbstractCegarLoop]: Verification canceled [2018-11-07 22:18:43,181 WARN L205 ceAbstractionStarter]: Timeout [2018-11-07 22:18:43,181 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 10:18:43 BoogieIcfgContainer [2018-11-07 22:18:43,181 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-07 22:18:43,182 INFO L168 Benchmark]: Toolchain (without parser) took 227948.39 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 758.6 MB). Free memory was 1.4 GB in the beginning and 1.8 GB in the end (delta: -383.3 MB). Peak memory consumption was 375.4 MB. Max. memory is 7.1 GB. [2018-11-07 22:18:43,183 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 22:18:43,183 INFO L168 Benchmark]: CACSL2BoogieTranslator took 311.78 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 22:18:43,184 INFO L168 Benchmark]: Boogie Procedure Inliner took 25.64 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 22:18:43,184 INFO L168 Benchmark]: Boogie Preprocessor took 31.99 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 22:18:43,184 INFO L168 Benchmark]: RCFGBuilder took 354.09 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 765.5 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -818.1 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. [2018-11-07 22:18:43,185 INFO L168 Benchmark]: TraceAbstraction took 227217.54 ms. Allocated memory was 2.3 GB in the beginning and 2.3 GB in the end (delta: -6.8 MB). Free memory was 2.2 GB in the beginning and 1.8 GB in the end (delta: 424.2 MB). Peak memory consumption was 417.4 MB. Max. memory is 7.1 GB. [2018-11-07 22:18:43,187 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 311.78 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 25.64 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 31.99 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 354.09 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 765.5 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -818.1 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 227217.54 ms. Allocated memory was 2.3 GB in the beginning and 2.3 GB in the end (delta: -6.8 MB). Free memory was 2.2 GB in the beginning and 1.8 GB in the end (delta: 424.2 MB). Peak memory consumption was 417.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 219 with TraceHistMax 70,while TraceCheckSpWp was constructing backward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 115 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. TIMEOUT Result, 227.1s OverallTime, 71 OverallIterations, 70 TraceHistogramMax, 12.4s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 779 SDtfs, 2415 SDslu, 16575 SDs, 0 SdLazy, 6738 SolverSat, 102 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 8.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 18059 GetRequests, 13230 SyntacticMatches, 0 SemanticMatches, 4829 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 197.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=219occurred in iteration=70, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 70 MinimizatonAttempts, 69 StatesRemovedByMinimization, 69 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 2.4s SatisfiabilityAnalysisTime, 202.9s InterpolantComputationTime, 15593 NumberOfCodeBlocks, 15593 NumberOfCodeBlocksAsserted, 965 NumberOfCheckSat, 23173 ConstructedInterpolants, 0 QuantifiedInterpolants, 9635651 SizeOfPredicates, 68 NumberOfNonLiveVariables, 10948 ConjunctsInSsa, 2482 ConjunctsInUnsatCore, 206 InterpolantComputations, 2 PerfectInterpolantSequences, 0/485622 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown