java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:09:38,449 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:09:38,450 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:09:38,465 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:09:38,466 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:09:38,467 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:09:38,468 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:09:38,469 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:09:38,471 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:09:38,472 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:09:38,473 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:09:38,473 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:09:38,474 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:09:38,475 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:09:38,476 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:09:38,478 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:09:38,479 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:09:38,481 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:09:38,489 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:09:38,490 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:09:38,491 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:09:38,492 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:09:38,500 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-22 16:09:38,500 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-22 16:09:38,501 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-22 16:09:38,501 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-22 16:09:38,505 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-22 16:09:38,506 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-22 16:09:38,506 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-22 16:09:38,510 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-22 16:09:38,510 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-22 16:09:38,514 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-22 16:09:38,514 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-22 16:09:38,514 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-22 16:09:38,515 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-22 16:09:38,516 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-22 16:09:38,516 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-22 16:09:38,531 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:09:38,531 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:09:38,532 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:09:38,532 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:09:38,532 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:09:38,532 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:09:38,532 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:09:38,533 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:09:38,533 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:09:38,533 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:09:38,533 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:09:38,533 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:09:38,534 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:09:38,534 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:09:38,534 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:09:38,534 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:09:38,535 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:09:38,535 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:09:38,535 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:09:38,535 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:09:38,535 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:09:38,536 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:09:38,536 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:09:38,536 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:09:38,536 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:09:38,536 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:09:38,537 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:09:38,537 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:09:38,537 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:09:38,537 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:09:38,537 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:09:38,538 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:09:38,538 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:09:38,538 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:09:38,580 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:09:38,593 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:09:38,597 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:09:38,599 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:09:38,599 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:09:38,600 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i [2018-10-22 16:09:38,667 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/07f88af31/61292a0990264c1dac52d27395af6de0/FLAG835138a24 [2018-10-22 16:09:39,131 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:09:39,133 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i [2018-10-22 16:09:39,141 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/07f88af31/61292a0990264c1dac52d27395af6de0/FLAG835138a24 [2018-10-22 16:09:39,153 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/07f88af31/61292a0990264c1dac52d27395af6de0 [2018-10-22 16:09:39,165 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:09:39,167 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:09:39,167 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:09:39,168 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:09:39,170 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:09:39,171 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,173 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@619cc6bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39, skipping insertion in model container [2018-10-22 16:09:39,174 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,183 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:09:39,201 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:09:39,376 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:09:39,380 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:09:39,397 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:09:39,412 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:09:39,412 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39 WrapperNode [2018-10-22 16:09:39,412 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:09:39,413 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:09:39,413 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:09:39,414 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:09:39,423 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,429 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,434 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:09:39,435 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:09:39,435 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:09:39,435 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:09:39,445 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,445 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,446 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,446 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,449 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,454 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,455 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,456 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:09:39,457 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:09:39,457 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:09:39,457 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:09:39,458 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:09:39,517 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:09:39,517 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:09:39,517 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:09:39,517 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:09:39,518 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:09:39,518 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:09:39,518 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:09:39,518 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:09:39,788 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:09:39,789 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:09:39 BoogieIcfgContainer [2018-10-22 16:09:39,789 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:09:39,790 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:09:39,790 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:09:39,793 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:09:39,793 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:09:39" (1/3) ... [2018-10-22 16:09:39,794 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6045088c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:09:39, skipping insertion in model container [2018-10-22 16:09:39,794 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (2/3) ... [2018-10-22 16:09:39,795 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6045088c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:09:39, skipping insertion in model container [2018-10-22 16:09:39,795 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:09:39" (3/3) ... [2018-10-22 16:09:39,797 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_k_true-unreach-call_true-termination.i [2018-10-22 16:09:39,807 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:09:39,815 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:09:39,836 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:09:39,892 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:09:39,893 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:09:39,893 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:09:39,893 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:09:39,893 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:09:39,893 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:09:39,894 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:09:39,894 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:09:39,894 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:09:39,939 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-10-22 16:09:39,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-22 16:09:39,945 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:39,946 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:39,949 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:39,955 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:39,955 INFO L82 PathProgramCache]: Analyzing trace with hash 1152414567, now seen corresponding path program 1 times [2018-10-22 16:09:39,957 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:40,003 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:40,003 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:40,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:40,004 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:40,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:40,068 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:40,070 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:09:40,070 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:09:40,071 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:09:40,074 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:09:40,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:09:40,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:09:40,089 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-10-22 16:09:40,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:40,109 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2018-10-22 16:09:40,109 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:09:40,110 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2018-10-22 16:09:40,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:40,120 INFO L225 Difference]: With dead ends: 33 [2018-10-22 16:09:40,120 INFO L226 Difference]: Without dead ends: 14 [2018-10-22 16:09:40,123 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:09:40,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-22 16:09:40,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-22 16:09:40,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-22 16:09:40,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-22 16:09:40,163 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-22 16:09:40,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:40,163 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-22 16:09:40,163 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:09:40,164 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-22 16:09:40,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-22 16:09:40,165 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:40,165 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:40,165 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:40,166 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:40,166 INFO L82 PathProgramCache]: Analyzing trace with hash 1083883255, now seen corresponding path program 1 times [2018-10-22 16:09:40,166 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:40,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:40,167 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:40,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:40,168 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:40,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:40,391 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 9 DAG size of output: 5 [2018-10-22 16:09:40,627 WARN L179 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 7 [2018-10-22 16:09:40,677 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:40,677 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:09:40,678 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-10-22 16:09:40,678 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:09:40,680 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 16:09:40,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 16:09:40,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:09:40,683 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2018-10-22 16:09:40,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:40,809 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-22 16:09:40,809 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 16:09:40,809 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2018-10-22 16:09:40,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:40,810 INFO L225 Difference]: With dead ends: 21 [2018-10-22 16:09:40,811 INFO L226 Difference]: Without dead ends: 16 [2018-10-22 16:09:40,812 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-10-22 16:09:40,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-22 16:09:40,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-22 16:09:40,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-22 16:09:40,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-22 16:09:40,817 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 12 [2018-10-22 16:09:40,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:40,817 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-22 16:09:40,818 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 16:09:40,818 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-22 16:09:40,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-22 16:09:40,819 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:40,819 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:40,819 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:40,819 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:40,820 INFO L82 PathProgramCache]: Analyzing trace with hash 1128913667, now seen corresponding path program 1 times [2018-10-22 16:09:40,820 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:40,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:40,821 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:40,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:40,821 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:40,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:40,934 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:40,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:40,935 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:40,936 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-10-22 16:09:40,938 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [15], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-22 16:09:40,984 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:09:40,985 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:09:41,300 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:09:41,302 INFO L272 AbstractInterpreter]: Visited 14 different actions 102 times. Merged at 4 different actions 44 times. Widened at 1 different actions 7 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-22 16:09:41,315 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:41,316 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:09:41,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:41,316 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:41,337 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:41,337 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:41,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:41,377 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:41,665 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:41,665 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:41,787 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:41,817 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:41,818 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:41,835 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:41,836 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:41,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:41,853 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:41,859 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:41,860 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:41,929 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:41,932 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:41,932 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-10-22 16:09:41,932 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:41,933 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 16:09:41,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 16:09:41,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:09:41,935 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 7 states. [2018-10-22 16:09:42,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:42,082 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-10-22 16:09:42,082 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 16:09:42,082 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-10-22 16:09:42,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:42,083 INFO L225 Difference]: With dead ends: 30 [2018-10-22 16:09:42,084 INFO L226 Difference]: Without dead ends: 25 [2018-10-22 16:09:42,084 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 53 SyntacticMatches, 4 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-10-22 16:09:42,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-22 16:09:42,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-22 16:09:42,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-22 16:09:42,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-10-22 16:09:42,091 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 15 [2018-10-22 16:09:42,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:42,091 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-10-22 16:09:42,091 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 16:09:42,091 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-10-22 16:09:42,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-22 16:09:42,092 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:42,092 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:42,093 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:42,093 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:42,093 INFO L82 PathProgramCache]: Analyzing trace with hash 1437681655, now seen corresponding path program 2 times [2018-10-22 16:09:42,093 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:42,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:42,095 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:42,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:42,095 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:42,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:42,226 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:42,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:42,227 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:42,227 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:42,228 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:42,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:42,228 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:42,248 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:42,248 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:42,263 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:42,263 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:42,269 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:42,440 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:42,441 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:42,695 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:42,715 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:42,715 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:42,731 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:42,731 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:42,749 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:42,750 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:42,754 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:42,765 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:42,765 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:42,834 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:42,835 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:42,836 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-10-22 16:09:42,836 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:42,837 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:09:42,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:09:42,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:09:42,838 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2018-10-22 16:09:43,170 WARN L179 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 12 DAG size of output: 8 [2018-10-22 16:09:43,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:43,543 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2018-10-22 16:09:43,544 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:09:43,544 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2018-10-22 16:09:43,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:43,545 INFO L225 Difference]: With dead ends: 39 [2018-10-22 16:09:43,545 INFO L226 Difference]: Without dead ends: 34 [2018-10-22 16:09:43,546 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 86 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=127, Invalid=253, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:09:43,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-22 16:09:43,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-22 16:09:43,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-22 16:09:43,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-22 16:09:43,553 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 24 [2018-10-22 16:09:43,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:43,554 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-22 16:09:43,554 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:09:43,554 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-22 16:09:43,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-22 16:09:43,555 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:43,555 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:43,555 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:43,556 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:43,556 INFO L82 PathProgramCache]: Analyzing trace with hash -656200317, now seen corresponding path program 3 times [2018-10-22 16:09:43,556 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:43,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:43,557 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:43,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:43,558 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:43,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:43,827 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:43,828 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:43,828 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:43,828 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:43,829 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:43,829 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:43,829 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:43,839 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:43,840 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:43,872 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-22 16:09:43,872 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:43,875 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:43,986 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:43,987 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:44,285 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:44,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:44,315 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:44,333 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:44,333 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:44,380 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-22 16:09:44,380 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:44,384 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:44,396 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:44,396 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:44,520 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:44,522 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:44,522 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 20 [2018-10-22 16:09:44,522 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:44,523 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 16:09:44,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 16:09:44,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=261, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:09:44,525 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 13 states. [2018-10-22 16:09:44,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:44,957 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2018-10-22 16:09:44,958 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 16:09:44,958 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2018-10-22 16:09:44,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:44,960 INFO L225 Difference]: With dead ends: 48 [2018-10-22 16:09:44,961 INFO L226 Difference]: Without dead ends: 43 [2018-10-22 16:09:44,962 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 119 SyntacticMatches, 4 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=277, Invalid=535, Unknown=0, NotChecked=0, Total=812 [2018-10-22 16:09:44,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-22 16:09:44,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-10-22 16:09:44,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-22 16:09:44,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-10-22 16:09:44,969 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 33 [2018-10-22 16:09:44,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:44,970 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-10-22 16:09:44,970 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 16:09:44,970 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-10-22 16:09:44,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-10-22 16:09:44,971 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:44,972 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:44,972 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:44,972 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:44,972 INFO L82 PathProgramCache]: Analyzing trace with hash -1490238089, now seen corresponding path program 4 times [2018-10-22 16:09:44,972 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:44,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:44,973 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:44,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:44,974 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:44,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:45,462 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:45,463 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:45,463 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:45,463 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:45,464 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:45,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:45,464 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:45,472 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:45,472 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:45,485 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:45,485 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:45,488 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:45,597 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:45,598 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:46,056 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:46,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:46,077 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:46,093 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:46,093 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:46,121 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:46,122 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:46,126 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:46,140 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:46,141 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:46,698 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:46,701 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:46,701 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 26 [2018-10-22 16:09:46,701 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:46,702 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:09:46,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:09:46,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=441, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:09:46,705 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 16 states. [2018-10-22 16:09:47,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:47,480 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2018-10-22 16:09:47,480 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 16:09:47,480 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 42 [2018-10-22 16:09:47,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:47,481 INFO L225 Difference]: With dead ends: 57 [2018-10-22 16:09:47,481 INFO L226 Difference]: Without dead ends: 52 [2018-10-22 16:09:47,483 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 152 SyntacticMatches, 4 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=490, Invalid=916, Unknown=0, NotChecked=0, Total=1406 [2018-10-22 16:09:47,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-22 16:09:47,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-10-22 16:09:47,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-22 16:09:47,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-10-22 16:09:47,490 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 42 [2018-10-22 16:09:47,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:47,491 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-10-22 16:09:47,491 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:09:47,491 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-10-22 16:09:47,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-22 16:09:47,493 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:47,493 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:47,493 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:47,493 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:47,493 INFO L82 PathProgramCache]: Analyzing trace with hash 45932547, now seen corresponding path program 5 times [2018-10-22 16:09:47,494 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:47,495 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:47,495 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:47,495 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:47,495 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:47,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:47,952 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:47,953 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:47,953 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:47,953 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:47,953 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:47,953 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:47,953 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:47,962 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:47,962 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:47,996 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2018-10-22 16:09:47,997 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:48,001 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:48,113 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:48,113 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:48,580 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:48,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:48,601 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:48,616 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:48,617 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:48,684 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2018-10-22 16:09:48,684 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:48,688 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:48,704 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:48,705 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:48,962 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:48,965 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:48,965 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 32 [2018-10-22 16:09:48,965 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:48,966 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-22 16:09:48,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-22 16:09:48,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=666, Unknown=0, NotChecked=0, Total=992 [2018-10-22 16:09:48,967 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 19 states. [2018-10-22 16:09:49,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:49,696 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2018-10-22 16:09:49,698 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 16:09:49,698 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 51 [2018-10-22 16:09:49,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:49,699 INFO L225 Difference]: With dead ends: 66 [2018-10-22 16:09:49,699 INFO L226 Difference]: Without dead ends: 61 [2018-10-22 16:09:49,701 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 185 SyntacticMatches, 4 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=766, Invalid=1396, Unknown=0, NotChecked=0, Total=2162 [2018-10-22 16:09:49,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-22 16:09:49,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-10-22 16:09:49,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-10-22 16:09:49,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-10-22 16:09:49,708 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 51 [2018-10-22 16:09:49,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:49,709 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-10-22 16:09:49,709 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-22 16:09:49,709 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-10-22 16:09:49,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-10-22 16:09:49,711 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:49,711 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:49,711 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:49,711 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:49,712 INFO L82 PathProgramCache]: Analyzing trace with hash -1227627785, now seen corresponding path program 6 times [2018-10-22 16:09:49,712 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:49,713 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:49,713 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:49,713 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:49,713 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:49,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:50,403 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:50,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:50,403 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:50,403 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:50,403 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:50,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:50,404 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:50,411 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:50,411 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:50,446 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 17 check-sat command(s) [2018-10-22 16:09:50,446 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:50,448 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:50,577 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:50,578 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:51,198 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:51,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:51,228 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:51,245 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:51,245 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:51,341 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 17 check-sat command(s) [2018-10-22 16:09:51,341 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:51,345 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:51,362 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:51,362 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:51,498 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (13)] Exception during sending of exit command (exit): Broken pipe [2018-10-22 16:09:51,500 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:51,500 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 38 [2018-10-22 16:09:51,500 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:51,501 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 16:09:51,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 16:09:51,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=936, Unknown=0, NotChecked=0, Total=1406 [2018-10-22 16:09:51,502 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 22 states. [2018-10-22 16:09:52,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:52,571 INFO L93 Difference]: Finished difference Result 75 states and 77 transitions. [2018-10-22 16:09:52,572 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 16:09:52,572 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 60 [2018-10-22 16:09:52,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:52,573 INFO L225 Difference]: With dead ends: 75 [2018-10-22 16:09:52,573 INFO L226 Difference]: Without dead ends: 70 [2018-10-22 16:09:52,574 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 218 SyntacticMatches, 4 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1105, Invalid=1975, Unknown=0, NotChecked=0, Total=3080 [2018-10-22 16:09:52,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-22 16:09:52,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-10-22 16:09:52,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-10-22 16:09:52,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2018-10-22 16:09:52,584 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 60 [2018-10-22 16:09:52,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:52,584 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2018-10-22 16:09:52,584 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 16:09:52,585 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2018-10-22 16:09:52,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-22 16:09:52,588 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:52,588 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:52,589 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:52,589 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:52,589 INFO L82 PathProgramCache]: Analyzing trace with hash 360641155, now seen corresponding path program 7 times [2018-10-22 16:09:52,589 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:52,590 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:52,590 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:52,590 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:52,590 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:52,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:53,076 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:53,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:53,077 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:53,077 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:53,077 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:53,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:53,077 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:53,085 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:53,085 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:53,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:53,120 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:53,205 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:53,205 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:54,041 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:54,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:54,061 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:54,076 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:54,076 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:54,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:54,131 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:54,160 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:54,160 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:54,466 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:54,468 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:54,469 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 44 [2018-10-22 16:09:54,469 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:54,469 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-22 16:09:54,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-22 16:09:54,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=641, Invalid=1251, Unknown=0, NotChecked=0, Total=1892 [2018-10-22 16:09:54,471 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand 25 states. [2018-10-22 16:09:55,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:55,720 INFO L93 Difference]: Finished difference Result 84 states and 86 transitions. [2018-10-22 16:09:55,723 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-22 16:09:55,723 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 69 [2018-10-22 16:09:55,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:55,725 INFO L225 Difference]: With dead ends: 84 [2018-10-22 16:09:55,725 INFO L226 Difference]: Without dead ends: 79 [2018-10-22 16:09:55,727 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 251 SyntacticMatches, 4 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1507, Invalid=2653, Unknown=0, NotChecked=0, Total=4160 [2018-10-22 16:09:55,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-22 16:09:55,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-10-22 16:09:55,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-22 16:09:55,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2018-10-22 16:09:55,735 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 69 [2018-10-22 16:09:55,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:55,736 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2018-10-22 16:09:55,736 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-22 16:09:55,736 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2018-10-22 16:09:55,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-10-22 16:09:55,737 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:55,737 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:55,738 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:55,738 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:55,738 INFO L82 PathProgramCache]: Analyzing trace with hash -318857097, now seen corresponding path program 8 times [2018-10-22 16:09:55,738 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:55,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:55,739 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:55,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:55,739 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:55,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:56,219 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:56,220 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:56,220 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:56,220 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:56,220 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:56,220 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:56,220 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:56,228 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:56,228 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:56,265 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:56,265 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:56,278 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:56,445 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:56,445 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:57,638 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:57,660 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:57,660 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:57,676 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:57,676 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:57,722 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:57,722 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:57,726 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:57,850 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:57,850 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:58,002 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:58,003 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:58,003 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 26, 26] total 55 [2018-10-22 16:09:58,003 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:58,004 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-22 16:09:58,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-22 16:09:58,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=982, Invalid=1988, Unknown=0, NotChecked=0, Total=2970 [2018-10-22 16:09:58,005 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 28 states. [2018-10-22 16:09:58,775 WARN L179 SmtUtils]: Spent 311.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 11 [2018-10-22 16:09:59,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:59,863 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2018-10-22 16:09:59,864 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-22 16:09:59,864 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 78 [2018-10-22 16:09:59,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:59,865 INFO L225 Difference]: With dead ends: 93 [2018-10-22 16:09:59,866 INFO L226 Difference]: Without dead ends: 88 [2018-10-22 16:09:59,868 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 278 SyntacticMatches, 6 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 794 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2153, Invalid=3853, Unknown=0, NotChecked=0, Total=6006 [2018-10-22 16:09:59,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-10-22 16:09:59,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-10-22 16:09:59,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-10-22 16:09:59,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 88 transitions. [2018-10-22 16:09:59,876 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 88 transitions. Word has length 78 [2018-10-22 16:09:59,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:59,877 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 88 transitions. [2018-10-22 16:09:59,877 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-22 16:09:59,877 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 88 transitions. [2018-10-22 16:09:59,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-10-22 16:09:59,878 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:59,879 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:59,879 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:59,879 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:59,879 INFO L82 PathProgramCache]: Analyzing trace with hash -1949211389, now seen corresponding path program 9 times [2018-10-22 16:09:59,879 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:59,880 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:59,880 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:59,880 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:59,880 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:59,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:00,796 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:00,796 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:00,797 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:00,797 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:00,797 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:00,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:00,797 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:00,805 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:00,805 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:00,834 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2018-10-22 16:10:00,834 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:00,837 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:00,947 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:00,947 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:03,027 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:03,048 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:03,048 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:03,063 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:03,063 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:03,239 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2018-10-22 16:10:03,239 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:03,242 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:03,262 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:03,262 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:03,370 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (19)] Exception during sending of exit command (exit): Broken pipe [2018-10-22 16:10:03,374 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:03,374 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29] total 56 [2018-10-22 16:10:03,374 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:03,375 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-22 16:10:03,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-22 16:10:03,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1064, Invalid=2016, Unknown=0, NotChecked=0, Total=3080 [2018-10-22 16:10:03,377 INFO L87 Difference]: Start difference. First operand 88 states and 88 transitions. Second operand 31 states. [2018-10-22 16:10:04,208 WARN L179 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 11 [2018-10-22 16:10:04,571 WARN L179 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 11 [2018-10-22 16:10:05,726 WARN L179 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2018-10-22 16:10:06,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:06,178 INFO L93 Difference]: Finished difference Result 102 states and 104 transitions. [2018-10-22 16:10:06,179 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-22 16:10:06,179 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 87 [2018-10-22 16:10:06,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:06,180 INFO L225 Difference]: With dead ends: 102 [2018-10-22 16:10:06,181 INFO L226 Difference]: Without dead ends: 97 [2018-10-22 16:10:06,183 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 317 SyntacticMatches, 4 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=2500, Invalid=4306, Unknown=0, NotChecked=0, Total=6806 [2018-10-22 16:10:06,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-10-22 16:10:06,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-10-22 16:10:06,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-10-22 16:10:06,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2018-10-22 16:10:06,196 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 87 [2018-10-22 16:10:06,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:06,196 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2018-10-22 16:10:06,196 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-22 16:10:06,196 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2018-10-22 16:10:06,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-22 16:10:06,198 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:06,198 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:06,198 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:06,199 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:06,199 INFO L82 PathProgramCache]: Analyzing trace with hash 1275395575, now seen corresponding path program 10 times [2018-10-22 16:10:06,199 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:06,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:06,200 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:06,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:06,200 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:06,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:06,813 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:06,813 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:06,813 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:06,814 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:06,814 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:06,814 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:06,814 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:06,822 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:06,823 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:06,863 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:06,863 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:06,876 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:07,002 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:07,003 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:08,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:08,290 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:08,290 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:08,309 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:08,309 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:08,350 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:08,351 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:08,365 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:09,343 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:09,343 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:10,096 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:10,099 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:10,099 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32, 32, 32] total 81 [2018-10-22 16:10:10,099 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:10,100 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-22 16:10:10,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-22 16:10:10,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1909, Invalid=4571, Unknown=0, NotChecked=0, Total=6480 [2018-10-22 16:10:10,102 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 34 states. [2018-10-22 16:10:12,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:12,397 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2018-10-22 16:10:12,397 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-22 16:10:12,398 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 96 [2018-10-22 16:10:12,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:12,399 INFO L225 Difference]: With dead ends: 111 [2018-10-22 16:10:12,399 INFO L226 Difference]: Without dead ends: 106 [2018-10-22 16:10:12,402 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 330 SyntacticMatches, 6 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2255 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=3944, Invalid=8046, Unknown=0, NotChecked=0, Total=11990 [2018-10-22 16:10:12,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-10-22 16:10:12,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2018-10-22 16:10:12,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-10-22 16:10:12,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 106 transitions. [2018-10-22 16:10:12,410 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 106 transitions. Word has length 96 [2018-10-22 16:10:12,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:12,410 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 106 transitions. [2018-10-22 16:10:12,410 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-22 16:10:12,410 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 106 transitions. [2018-10-22 16:10:12,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-10-22 16:10:12,412 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:12,412 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:12,412 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:12,412 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:12,413 INFO L82 PathProgramCache]: Analyzing trace with hash -2040776829, now seen corresponding path program 11 times [2018-10-22 16:10:12,413 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:12,413 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:12,414 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:12,414 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:12,414 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:12,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:13,169 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:13,169 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:13,169 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:13,169 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:13,169 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:13,169 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:13,170 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:13,176 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:13,177 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:13,247 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 32 check-sat command(s) [2018-10-22 16:10:13,247 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:13,258 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:13,376 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:13,376 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:15,362 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:15,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:15,382 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:15,397 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:15,397 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:15,589 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 32 check-sat command(s) [2018-10-22 16:10:15,589 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:15,594 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:15,621 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:15,621 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:15,848 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:15,849 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:15,849 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35, 35, 35] total 68 [2018-10-22 16:10:15,849 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:15,850 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-22 16:10:15,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-22 16:10:15,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1595, Invalid=2961, Unknown=0, NotChecked=0, Total=4556 [2018-10-22 16:10:15,852 INFO L87 Difference]: Start difference. First operand 106 states and 106 transitions. Second operand 37 states. [2018-10-22 16:10:18,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:18,379 INFO L93 Difference]: Finished difference Result 120 states and 122 transitions. [2018-10-22 16:10:18,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-22 16:10:18,380 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 105 [2018-10-22 16:10:18,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:18,381 INFO L225 Difference]: With dead ends: 120 [2018-10-22 16:10:18,381 INFO L226 Difference]: Without dead ends: 115 [2018-10-22 16:10:18,384 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 383 SyntacticMatches, 4 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 820 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=3745, Invalid=6355, Unknown=0, NotChecked=0, Total=10100 [2018-10-22 16:10:18,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-22 16:10:18,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2018-10-22 16:10:18,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-22 16:10:18,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2018-10-22 16:10:18,391 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 105 [2018-10-22 16:10:18,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:18,392 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2018-10-22 16:10:18,392 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-22 16:10:18,392 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2018-10-22 16:10:18,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-10-22 16:10:18,394 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:18,394 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:18,394 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:18,394 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:18,394 INFO L82 PathProgramCache]: Analyzing trace with hash -264307849, now seen corresponding path program 12 times [2018-10-22 16:10:18,394 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:18,395 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:18,395 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:18,395 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:18,396 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:18,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:20,019 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:20,019 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:20,019 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:20,019 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:20,019 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:20,020 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:20,020 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:20,028 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:20,029 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:20,110 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 35 check-sat command(s) [2018-10-22 16:10:20,110 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:20,114 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:20,263 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:20,264 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:22,045 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:22,065 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:22,065 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:22,080 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:22,080 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:22,337 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 35 check-sat command(s) [2018-10-22 16:10:22,338 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:22,342 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:22,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:22,371 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:22,543 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:22,545 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:22,545 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38, 38, 38] total 74 [2018-10-22 16:10:22,545 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:22,545 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-22 16:10:22,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-22 16:10:22,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1901, Invalid=3501, Unknown=0, NotChecked=0, Total=5402 [2018-10-22 16:10:22,547 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 40 states. [2018-10-22 16:10:25,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:25,718 INFO L93 Difference]: Finished difference Result 129 states and 131 transitions. [2018-10-22 16:10:25,718 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-22 16:10:25,718 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 114 [2018-10-22 16:10:25,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:25,720 INFO L225 Difference]: With dead ends: 129 [2018-10-22 16:10:25,720 INFO L226 Difference]: Without dead ends: 124 [2018-10-22 16:10:25,722 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 416 SyntacticMatches, 4 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 949 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=4462, Invalid=7528, Unknown=0, NotChecked=0, Total=11990 [2018-10-22 16:10:25,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-22 16:10:25,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2018-10-22 16:10:25,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-10-22 16:10:25,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 124 transitions. [2018-10-22 16:10:25,727 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 124 transitions. Word has length 114 [2018-10-22 16:10:25,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:25,728 INFO L481 AbstractCegarLoop]: Abstraction has 124 states and 124 transitions. [2018-10-22 16:10:25,728 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-22 16:10:25,728 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 124 transitions. [2018-10-22 16:10:25,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-10-22 16:10:25,730 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:25,730 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:25,730 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:25,730 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:25,731 INFO L82 PathProgramCache]: Analyzing trace with hash 1271360003, now seen corresponding path program 13 times [2018-10-22 16:10:25,731 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:25,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:25,731 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:25,732 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:25,732 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:25,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:26,751 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:26,751 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:26,751 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:26,751 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:26,752 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:26,752 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:26,752 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:26,760 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:26,760 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:26,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:26,900 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:27,034 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:27,035 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:29,332 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:29,351 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:29,352 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:29,367 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:29,367 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:29,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:29,443 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:29,476 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:29,476 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:29,695 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:29,696 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:29,696 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41, 41, 41] total 80 [2018-10-22 16:10:29,697 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:29,697 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-22 16:10:29,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-22 16:10:29,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2234, Invalid=4086, Unknown=0, NotChecked=0, Total=6320 [2018-10-22 16:10:29,698 INFO L87 Difference]: Start difference. First operand 124 states and 124 transitions. Second operand 43 states. [2018-10-22 16:10:33,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:33,547 INFO L93 Difference]: Finished difference Result 138 states and 140 transitions. [2018-10-22 16:10:33,548 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-22 16:10:33,548 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 123 [2018-10-22 16:10:33,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:33,549 INFO L225 Difference]: With dead ends: 138 [2018-10-22 16:10:33,550 INFO L226 Difference]: Without dead ends: 133 [2018-10-22 16:10:33,552 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 449 SyntacticMatches, 4 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1087 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=5242, Invalid=8800, Unknown=0, NotChecked=0, Total=14042 [2018-10-22 16:10:33,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-10-22 16:10:33,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2018-10-22 16:10:33,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-10-22 16:10:33,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 133 transitions. [2018-10-22 16:10:33,558 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 133 transitions. Word has length 123 [2018-10-22 16:10:33,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:33,559 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 133 transitions. [2018-10-22 16:10:33,559 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-22 16:10:33,559 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 133 transitions. [2018-10-22 16:10:33,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-10-22 16:10:33,560 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:33,560 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:33,560 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:33,560 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:33,561 INFO L82 PathProgramCache]: Analyzing trace with hash -1878746889, now seen corresponding path program 14 times [2018-10-22 16:10:33,561 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:33,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:33,561 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:33,562 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:33,562 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:33,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:34,657 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:34,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:34,658 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:34,658 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:34,658 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:34,658 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:34,658 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:34,665 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:34,666 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:34,778 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:34,778 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:34,840 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:35,111 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:35,111 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:37,668 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:37,688 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:37,688 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:37,702 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:37,703 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:37,783 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:37,783 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:37,788 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:37,983 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:37,983 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:38,226 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:38,229 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:38,229 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44, 44, 44] total 91 [2018-10-22 16:10:38,229 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:38,229 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-22 16:10:38,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-22 16:10:38,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2827, Invalid=5363, Unknown=0, NotChecked=0, Total=8190 [2018-10-22 16:10:38,231 INFO L87 Difference]: Start difference. First operand 133 states and 133 transitions. Second operand 46 states. [2018-10-22 16:10:42,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:42,791 INFO L93 Difference]: Finished difference Result 147 states and 149 transitions. [2018-10-22 16:10:42,792 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-22 16:10:42,792 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 132 [2018-10-22 16:10:42,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:42,793 INFO L225 Difference]: With dead ends: 147 [2018-10-22 16:10:42,794 INFO L226 Difference]: Without dead ends: 142 [2018-10-22 16:10:42,796 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 612 GetRequests, 476 SyntacticMatches, 6 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1757 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=6392, Invalid=10900, Unknown=0, NotChecked=0, Total=17292 [2018-10-22 16:10:42,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-10-22 16:10:42,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2018-10-22 16:10:42,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-10-22 16:10:42,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 142 transitions. [2018-10-22 16:10:42,803 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 142 transitions. Word has length 132 [2018-10-22 16:10:42,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:42,803 INFO L481 AbstractCegarLoop]: Abstraction has 142 states and 142 transitions. [2018-10-22 16:10:42,803 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-22 16:10:42,804 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 142 transitions. [2018-10-22 16:10:42,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2018-10-22 16:10:42,805 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:42,805 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:42,805 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:42,805 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:42,806 INFO L82 PathProgramCache]: Analyzing trace with hash -927269757, now seen corresponding path program 15 times [2018-10-22 16:10:42,806 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:42,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:42,807 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:42,807 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:42,807 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:42,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:43,975 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:43,975 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:43,975 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:43,975 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:43,976 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:43,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:43,976 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:43,983 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:43,983 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:44,031 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 44 check-sat command(s) [2018-10-22 16:10:44,031 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:44,037 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:44,231 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:44,231 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:47,274 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:47,296 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:47,296 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:47,311 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:47,311 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:47,661 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 44 check-sat command(s) [2018-10-22 16:10:47,661 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:47,666 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:47,706 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:47,706 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:47,918 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:47,919 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:47,920 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47, 47, 47] total 92 [2018-10-22 16:10:47,920 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:47,920 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-22 16:10:47,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-22 16:10:47,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2981, Invalid=5391, Unknown=0, NotChecked=0, Total=8372 [2018-10-22 16:10:47,921 INFO L87 Difference]: Start difference. First operand 142 states and 142 transitions. Second operand 49 states. [2018-10-22 16:10:53,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:53,147 INFO L93 Difference]: Finished difference Result 156 states and 158 transitions. [2018-10-22 16:10:53,147 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-22 16:10:53,148 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 141 [2018-10-22 16:10:53,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:53,149 INFO L225 Difference]: With dead ends: 156 [2018-10-22 16:10:53,149 INFO L226 Difference]: Without dead ends: 151 [2018-10-22 16:10:53,151 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 654 GetRequests, 515 SyntacticMatches, 4 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1390 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=6991, Invalid=11641, Unknown=0, NotChecked=0, Total=18632 [2018-10-22 16:10:53,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-10-22 16:10:53,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2018-10-22 16:10:53,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-10-22 16:10:53,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 151 transitions. [2018-10-22 16:10:53,158 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 151 transitions. Word has length 141 [2018-10-22 16:10:53,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:53,159 INFO L481 AbstractCegarLoop]: Abstraction has 151 states and 151 transitions. [2018-10-22 16:10:53,159 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-22 16:10:53,159 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 151 transitions. [2018-10-22 16:10:53,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-10-22 16:10:53,160 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:53,160 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:53,160 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:53,161 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:53,161 INFO L82 PathProgramCache]: Analyzing trace with hash -72493449, now seen corresponding path program 16 times [2018-10-22 16:10:53,161 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:53,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:53,162 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:53,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:53,162 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:53,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:54,520 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:54,520 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:54,520 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:54,520 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:54,521 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:54,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:54,521 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:54,529 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:54,529 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:54,593 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:54,593 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:54,610 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:54,769 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:54,769 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:58,163 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:58,183 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:58,183 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:58,198 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:58,198 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:58,264 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:58,264 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:58,269 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:58,706 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:58,707 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:59,217 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:59,222 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:59,222 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50, 50, 50] total 109 [2018-10-22 16:10:59,222 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:59,225 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-22 16:10:59,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-22 16:10:59,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3868, Invalid=7904, Unknown=0, NotChecked=0, Total=11772 [2018-10-22 16:10:59,226 INFO L87 Difference]: Start difference. First operand 151 states and 151 transitions. Second operand 52 states. [2018-10-22 16:10:59,781 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 9 [2018-10-22 16:10:59,920 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-22 16:11:00,658 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 131 DAG size of output: 11 [2018-10-22 16:11:05,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:05,453 INFO L93 Difference]: Finished difference Result 165 states and 167 transitions. [2018-10-22 16:11:05,453 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-22 16:11:05,453 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 150 [2018-10-22 16:11:05,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:05,455 INFO L225 Difference]: With dead ends: 165 [2018-10-22 16:11:05,455 INFO L226 Difference]: Without dead ends: 160 [2018-10-22 16:11:05,456 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 696 GetRequests, 536 SyntacticMatches, 6 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2906 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=8657, Invalid=15523, Unknown=0, NotChecked=0, Total=24180 [2018-10-22 16:11:05,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-10-22 16:11:05,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2018-10-22 16:11:05,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-10-22 16:11:05,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 160 transitions. [2018-10-22 16:11:05,462 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 160 transitions. Word has length 150 [2018-10-22 16:11:05,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:05,463 INFO L481 AbstractCegarLoop]: Abstraction has 160 states and 160 transitions. [2018-10-22 16:11:05,463 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-22 16:11:05,463 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 160 transitions. [2018-10-22 16:11:05,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-10-22 16:11:05,464 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:05,464 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:05,464 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:05,464 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:05,464 INFO L82 PathProgramCache]: Analyzing trace with hash 266268419, now seen corresponding path program 17 times [2018-10-22 16:11:05,464 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:05,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:05,465 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:05,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:05,465 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:05,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:07,098 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:07,098 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:07,098 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:07,098 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:07,098 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:07,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:07,099 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:07,115 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:11:07,115 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:07,384 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 50 check-sat command(s) [2018-10-22 16:11:07,384 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:07,405 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:07,624 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:07,624 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:11,693 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:11,722 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:11,722 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:11,744 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:11:11,744 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:12,165 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 50 check-sat command(s) [2018-10-22 16:11:12,165 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:12,170 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:12,209 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:12,210 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:12,380 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:12,382 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:12,382 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53, 53, 53] total 104 [2018-10-22 16:11:12,382 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:12,383 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-22 16:11:12,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-22 16:11:12,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3836, Invalid=6876, Unknown=0, NotChecked=0, Total=10712 [2018-10-22 16:11:12,384 INFO L87 Difference]: Start difference. First operand 160 states and 160 transitions. Second operand 55 states. [2018-10-22 16:11:12,565 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 8 [2018-10-22 16:11:12,803 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 9 [2018-10-22 16:11:12,936 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-22 16:11:13,078 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-22 16:11:13,355 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-22 16:11:13,502 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-10-22 16:11:19,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:19,059 INFO L93 Difference]: Finished difference Result 174 states and 176 transitions. [2018-10-22 16:11:19,060 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-22 16:11:19,060 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 159 [2018-10-22 16:11:19,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:19,061 INFO L225 Difference]: With dead ends: 174 [2018-10-22 16:11:19,061 INFO L226 Difference]: Without dead ends: 169 [2018-10-22 16:11:19,063 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 738 GetRequests, 581 SyntacticMatches, 4 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1729 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=8992, Invalid=14878, Unknown=0, NotChecked=0, Total=23870 [2018-10-22 16:11:19,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-10-22 16:11:19,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-10-22 16:11:19,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-10-22 16:11:19,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 169 transitions. [2018-10-22 16:11:19,070 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 169 transitions. Word has length 159 [2018-10-22 16:11:19,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:19,071 INFO L481 AbstractCegarLoop]: Abstraction has 169 states and 169 transitions. [2018-10-22 16:11:19,071 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-22 16:11:19,071 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 169 transitions. [2018-10-22 16:11:19,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-10-22 16:11:19,071 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:19,072 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:19,072 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:19,072 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:19,072 INFO L82 PathProgramCache]: Analyzing trace with hash -1651330057, now seen corresponding path program 18 times [2018-10-22 16:11:19,072 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:19,073 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:19,073 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:19,073 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:19,073 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:19,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:20,956 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:20,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:20,957 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:20,957 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:20,957 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:20,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:20,957 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:20,967 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:11:20,967 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:11:21,039 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 53 check-sat command(s) [2018-10-22 16:11:21,039 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:21,046 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:21,364 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:21,364 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:25,296 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:25,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:25,316 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:25,331 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:11:25,331 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:11:25,816 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 53 check-sat command(s) [2018-10-22 16:11:25,816 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:25,821 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:25,876 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:25,876 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:26,807 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:26,808 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:26,808 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56, 56, 56] total 110 [2018-10-22 16:11:26,809 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:26,809 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-10-22 16:11:26,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-10-22 16:11:26,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4304, Invalid=7686, Unknown=0, NotChecked=0, Total=11990 [2018-10-22 16:11:26,810 INFO L87 Difference]: Start difference. First operand 169 states and 169 transitions. Second operand 58 states. [2018-10-22 16:11:26,993 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 8 [2018-10-22 16:11:27,113 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 8 [2018-10-22 16:11:27,258 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 9 [2018-10-22 16:11:27,406 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-22 16:11:27,553 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-22 16:11:27,710 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-22 16:11:27,862 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-22 16:11:28,020 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-22 16:11:28,172 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-22 16:11:28,365 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-22 16:11:28,694 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-10-22 16:11:34,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:34,522 INFO L93 Difference]: Finished difference Result 183 states and 185 transitions. [2018-10-22 16:11:34,522 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-22 16:11:34,522 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 168 [2018-10-22 16:11:34,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:34,524 INFO L225 Difference]: With dead ends: 183 [2018-10-22 16:11:34,525 INFO L226 Difference]: Without dead ends: 178 [2018-10-22 16:11:34,527 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 780 GetRequests, 614 SyntacticMatches, 4 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1912 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=10087, Invalid=16645, Unknown=0, NotChecked=0, Total=26732 [2018-10-22 16:11:34,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-10-22 16:11:34,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2018-10-22 16:11:34,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-10-22 16:11:34,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 178 transitions. [2018-10-22 16:11:34,534 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 178 transitions. Word has length 168 [2018-10-22 16:11:34,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:34,534 INFO L481 AbstractCegarLoop]: Abstraction has 178 states and 178 transitions. [2018-10-22 16:11:34,535 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-10-22 16:11:34,535 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 178 transitions. [2018-10-22 16:11:34,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-10-22 16:11:34,536 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:34,536 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:34,536 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:34,536 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:34,536 INFO L82 PathProgramCache]: Analyzing trace with hash -639942269, now seen corresponding path program 19 times [2018-10-22 16:11:34,537 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:34,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:34,537 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:34,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:34,538 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:34,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:36,383 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:36,383 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:36,383 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:36,383 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:36,384 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:36,384 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:36,384 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:36,391 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:36,391 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:11:36,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:36,944 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:37,156 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:37,156 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:41,715 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:41,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:41,735 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:41,750 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:41,750 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:11:41,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:41,894 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:41,953 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:41,954 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:42,232 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:42,233 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:42,234 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59, 59, 59] total 116 [2018-10-22 16:11:42,234 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:42,234 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-10-22 16:11:42,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-10-22 16:11:42,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4799, Invalid=8541, Unknown=0, NotChecked=0, Total=13340 [2018-10-22 16:11:42,236 INFO L87 Difference]: Start difference. First operand 178 states and 178 transitions. Second operand 61 states. [2018-10-22 16:11:42,453 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 8 [2018-10-22 16:11:42,582 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 168 DAG size of output: 8 [2018-10-22 16:11:42,738 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 9 [2018-10-22 16:11:42,895 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-22 16:11:43,062 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-22 16:11:43,234 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-22 16:11:43,402 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-22 16:11:43,578 WARN L179 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-22 16:11:43,749 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-22 16:11:43,930 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-22 16:11:44,101 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-22 16:11:44,274 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-22 16:11:44,456 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-22 16:11:44,634 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-10-22 16:11:51,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:51,051 INFO L93 Difference]: Finished difference Result 192 states and 194 transitions. [2018-10-22 16:11:51,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-22 16:11:51,052 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 177 [2018-10-22 16:11:51,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:51,054 INFO L225 Difference]: With dead ends: 192 [2018-10-22 16:11:51,054 INFO L226 Difference]: Without dead ends: 187 [2018-10-22 16:11:51,056 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 822 GetRequests, 647 SyntacticMatches, 4 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2104 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=11245, Invalid=18511, Unknown=0, NotChecked=0, Total=29756 [2018-10-22 16:11:51,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-22 16:11:51,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2018-10-22 16:11:51,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-10-22 16:11:51,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 187 transitions. [2018-10-22 16:11:51,064 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 187 transitions. Word has length 177 [2018-10-22 16:11:51,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:51,065 INFO L481 AbstractCegarLoop]: Abstraction has 187 states and 187 transitions. [2018-10-22 16:11:51,065 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-10-22 16:11:51,065 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 187 transitions. [2018-10-22 16:11:51,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-10-22 16:11:51,066 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:51,066 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:51,066 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:51,067 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:51,067 INFO L82 PathProgramCache]: Analyzing trace with hash -99929737, now seen corresponding path program 20 times [2018-10-22 16:11:51,067 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:51,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:51,068 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:51,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:51,068 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:51,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:53,118 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:53,118 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:53,119 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:53,119 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:53,119 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:53,119 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:53,119 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:53,129 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:11:53,129 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:53,417 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:11:53,417 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:53,592 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:53,789 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:53,789 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:58,540 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:58,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:58,561 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:58,576 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:11:58,576 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:58,733 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:11:58,733 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:58,739 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:59,130 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:59,130 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:59,501 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:59,503 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:59,503 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62, 62, 62] total 127 [2018-10-22 16:11:59,503 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:59,504 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-10-22 16:11:59,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-10-22 16:11:59,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5644, Invalid=10358, Unknown=0, NotChecked=0, Total=16002 [2018-10-22 16:11:59,504 INFO L87 Difference]: Start difference. First operand 187 states and 187 transitions. Second operand 64 states. [2018-10-22 16:11:59,718 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 8 [2018-10-22 16:11:59,866 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 8 [2018-10-22 16:12:00,040 WARN L179 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 9 [2018-10-22 16:12:00,214 WARN L179 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-22 16:12:00,392 WARN L179 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-22 16:12:00,579 WARN L179 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-22 16:12:00,765 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-22 16:12:00,956 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-22 16:12:01,141 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-22 16:12:01,337 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-22 16:12:01,543 WARN L179 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-22 16:12:01,740 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-22 16:12:01,932 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-22 16:12:02,122 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-22 16:12:02,313 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-22 16:12:02,502 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-22 16:12:02,702 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-10-22 16:12:09,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:09,540 INFO L93 Difference]: Finished difference Result 201 states and 203 transitions. [2018-10-22 16:12:09,542 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-10-22 16:12:09,543 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 186 [2018-10-22 16:12:09,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:09,544 INFO L225 Difference]: With dead ends: 201 [2018-10-22 16:12:09,545 INFO L226 Difference]: Without dead ends: 196 [2018-10-22 16:12:09,546 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 864 GetRequests, 674 SyntacticMatches, 6 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3044 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=12899, Invalid=21511, Unknown=0, NotChecked=0, Total=34410 [2018-10-22 16:12:09,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-10-22 16:12:09,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2018-10-22 16:12:09,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-10-22 16:12:09,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 196 transitions. [2018-10-22 16:12:09,554 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 196 transitions. Word has length 186 [2018-10-22 16:12:09,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:09,555 INFO L481 AbstractCegarLoop]: Abstraction has 196 states and 196 transitions. [2018-10-22 16:12:09,555 INFO L482 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-10-22 16:12:09,555 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 196 transitions. [2018-10-22 16:12:09,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-10-22 16:12:09,556 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:09,556 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:09,556 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:09,556 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:09,557 INFO L82 PathProgramCache]: Analyzing trace with hash 89650179, now seen corresponding path program 21 times [2018-10-22 16:12:09,557 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:09,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:09,557 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:12:09,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:09,558 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:09,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:12,102 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:12,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:12,102 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:12:12,103 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:12:12,103 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:12:12,103 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:12,103 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:12:12,110 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:12:12,110 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:12:12,186 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 62 check-sat command(s) [2018-10-22 16:12:12,186 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:12,193 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:12,497 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:12,497 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:17,818 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:17,838 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:17,838 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:17,855 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:12:17,856 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:12:18,457 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 62 check-sat command(s) [2018-10-22 16:12:18,457 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:18,462 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:18,512 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:18,512 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:18,723 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:18,726 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:12:18,726 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65, 65, 65] total 128 [2018-10-22 16:12:18,726 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:12:18,727 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-10-22 16:12:18,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-10-22 16:12:18,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5870, Invalid=10386, Unknown=0, NotChecked=0, Total=16256 [2018-10-22 16:12:18,728 INFO L87 Difference]: Start difference. First operand 196 states and 196 transitions. Second operand 67 states. [2018-10-22 16:12:18,959 WARN L179 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 8 [2018-10-22 16:12:19,111 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 186 DAG size of output: 8 [2018-10-22 16:12:19,287 WARN L179 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 9 [2018-10-22 16:12:19,465 WARN L179 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-22 16:12:19,651 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-22 16:12:19,844 WARN L179 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-22 16:12:20,031 WARN L179 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-22 16:12:20,228 WARN L179 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-22 16:12:20,420 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-22 16:12:20,623 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-22 16:12:20,832 WARN L179 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-22 16:12:21,036 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-22 16:12:21,240 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-22 16:12:21,453 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-22 16:12:21,661 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-22 16:12:21,866 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-22 16:12:22,071 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-22 16:12:22,422 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-22 16:12:22,626 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-22 16:12:22,834 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-10-22 16:12:29,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:29,938 INFO L93 Difference]: Finished difference Result 210 states and 212 transitions. [2018-10-22 16:12:29,939 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-22 16:12:29,939 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 195 [2018-10-22 16:12:29,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:29,940 INFO L225 Difference]: With dead ends: 210 [2018-10-22 16:12:29,940 INFO L226 Difference]: Without dead ends: 205 [2018-10-22 16:12:29,942 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 713 SyntacticMatches, 4 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2515 ImplicationChecksByTransitivity, 18.5s TimeCoverageRelationStatistics Valid=13750, Invalid=22540, Unknown=0, NotChecked=0, Total=36290 [2018-10-22 16:12:29,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-10-22 16:12:29,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2018-10-22 16:12:29,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-10-22 16:12:29,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 205 transitions. [2018-10-22 16:12:29,950 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 205 transitions. Word has length 195 [2018-10-22 16:12:29,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:29,950 INFO L481 AbstractCegarLoop]: Abstraction has 205 states and 205 transitions. [2018-10-22 16:12:29,950 INFO L482 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-10-22 16:12:29,951 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 205 transitions. [2018-10-22 16:12:29,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-10-22 16:12:29,952 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:29,952 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:29,952 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:29,952 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:29,952 INFO L82 PathProgramCache]: Analyzing trace with hash 795823863, now seen corresponding path program 22 times [2018-10-22 16:12:29,952 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:29,953 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:29,953 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:12:29,953 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:29,953 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:30,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:32,470 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:32,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:32,470 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:12:32,470 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:12:32,471 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:12:32,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:32,471 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-22 16:12:32,479 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:12:32,479 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:12:32,753 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:12:32,753 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:32,895 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:33,147 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:33,147 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:39,004 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:39,024 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:39,024 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:39,039 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:12:39,039 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:12:39,122 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:12:39,122 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:39,128 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:41,514 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:41,514 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:43,561 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:43,562 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:12:43,562 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68, 68, 68] total 181 [2018-10-22 16:12:43,562 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:12:43,563 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-10-22 16:12:43,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-10-22 16:12:43,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9403, Invalid=23177, Unknown=0, NotChecked=0, Total=32580 [2018-10-22 16:12:43,564 INFO L87 Difference]: Start difference. First operand 205 states and 205 transitions. Second operand 70 states. [2018-10-22 16:12:43,850 WARN L179 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 8 [2018-10-22 16:12:44,018 WARN L179 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 8 [2018-10-22 16:12:44,281 WARN L179 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 9 [2018-10-22 16:12:44,541 WARN L179 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-10-22 16:12:44,811 WARN L179 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-10-22 16:12:45,086 WARN L179 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-10-22 16:12:45,353 WARN L179 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-22 16:12:45,627 WARN L179 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-22 16:12:45,908 WARN L179 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-22 16:12:46,183 WARN L179 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-22 16:12:46,472 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-22 16:12:46,756 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-22 16:12:47,034 WARN L179 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-22 16:12:47,317 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-22 16:12:47,594 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-22 16:12:47,869 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-22 16:12:48,151 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-22 16:12:48,424 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-22 16:12:48,699 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-22 16:12:48,979 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-22 16:12:49,254 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-22 16:12:49,792 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-10-22 16:12:50,067 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-10-22 16:12:57,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:57,662 INFO L93 Difference]: Finished difference Result 219 states and 221 transitions. [2018-10-22 16:12:57,662 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-10-22 16:12:57,662 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 204 [2018-10-22 16:12:57,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:57,664 INFO L225 Difference]: With dead ends: 219 [2018-10-22 16:12:57,664 INFO L226 Difference]: Without dead ends: 214 [2018-10-22 16:12:57,665 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 948 GetRequests, 698 SyntacticMatches, 6 SemanticMatches, 244 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11294 ImplicationChecksByTransitivity, 25.8s TimeCoverageRelationStatistics Valid=19709, Invalid=40561, Unknown=0, NotChecked=0, Total=60270 [2018-10-22 16:12:57,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-10-22 16:12:57,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 214. [2018-10-22 16:12:57,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2018-10-22 16:12:57,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 214 transitions. [2018-10-22 16:12:57,674 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 214 transitions. Word has length 204 [2018-10-22 16:12:57,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:57,674 INFO L481 AbstractCegarLoop]: Abstraction has 214 states and 214 transitions. [2018-10-22 16:12:57,674 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-10-22 16:12:57,674 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 214 transitions. [2018-10-22 16:12:57,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2018-10-22 16:12:57,675 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:57,676 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:57,676 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:57,676 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:57,676 INFO L82 PathProgramCache]: Analyzing trace with hash 385681027, now seen corresponding path program 23 times [2018-10-22 16:12:57,676 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:57,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:57,677 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:12:57,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:57,677 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:57,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:13:00,481 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:00,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:00,482 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:13:00,482 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:13:00,482 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:13:00,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:00,482 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-22 16:13:00,490 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:13:00,490 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:13:00,917 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 68 check-sat command(s) [2018-10-22 16:13:00,917 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:00,969 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:01,193 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:01,194 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:07,568 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:07,588 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:07,588 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:13:07,604 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:13:07,605 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:13:08,454 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 68 check-sat command(s) [2018-10-22 16:13:08,454 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:08,461 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:08,527 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:08,528 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:08,780 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:08,781 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:13:08,782 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71, 71, 71] total 140 [2018-10-22 16:13:08,782 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:13:08,782 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-10-22 16:13:08,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-10-22 16:13:08,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7049, Invalid=12411, Unknown=0, NotChecked=0, Total=19460 [2018-10-22 16:13:08,783 INFO L87 Difference]: Start difference. First operand 214 states and 214 transitions. Second operand 73 states. [2018-10-22 16:13:09,598 WARN L179 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 8 [2018-10-22 16:13:09,771 WARN L179 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 8 [2018-10-22 16:13:09,987 WARN L179 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 210 DAG size of output: 9 [2018-10-22 16:13:10,192 WARN L179 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-10-22 16:13:10,411 WARN L179 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-10-22 16:13:10,625 WARN L179 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-10-22 16:13:10,840 WARN L179 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-10-22 16:13:11,066 WARN L179 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-10-22 16:13:11,285 WARN L179 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-10-22 16:13:11,598 WARN L179 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-22 16:13:11,827 WARN L179 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-22 16:13:12,063 WARN L179 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-22 16:13:12,303 WARN L179 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-22 16:13:12,540 WARN L179 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-22 16:13:12,783 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-22 16:13:13,031 WARN L179 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-22 16:13:13,286 WARN L179 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-22 16:13:13,522 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-22 16:13:13,761 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-22 16:13:14,007 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-22 16:13:14,255 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-22 16:13:14,501 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-22 16:13:14,745 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-22 16:13:14,984 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-22 16:13:15,222 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-22 16:13:15,466 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-10-22 16:13:24,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:13:24,547 INFO L93 Difference]: Finished difference Result 228 states and 230 transitions. [2018-10-22 16:13:24,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-10-22 16:13:24,550 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 213 [2018-10-22 16:13:24,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:13:24,552 INFO L225 Difference]: With dead ends: 228 [2018-10-22 16:13:24,552 INFO L226 Difference]: Without dead ends: 223 [2018-10-22 16:13:24,553 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 990 GetRequests, 779 SyntacticMatches, 4 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2962 ImplicationChecksByTransitivity, 23.5s TimeCoverageRelationStatistics Valid=16507, Invalid=26965, Unknown=0, NotChecked=0, Total=43472 [2018-10-22 16:13:24,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-10-22 16:13:24,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 223. [2018-10-22 16:13:24,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2018-10-22 16:13:24,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 223 transitions. [2018-10-22 16:13:24,562 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 223 transitions. Word has length 213 [2018-10-22 16:13:24,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:13:24,563 INFO L481 AbstractCegarLoop]: Abstraction has 223 states and 223 transitions. [2018-10-22 16:13:24,563 INFO L482 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-10-22 16:13:24,563 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 223 transitions. [2018-10-22 16:13:24,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-10-22 16:13:24,564 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:13:24,564 INFO L375 BasicCegarLoop]: trace histogram [71, 70, 70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:13:24,565 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:13:24,565 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:13:24,565 INFO L82 PathProgramCache]: Analyzing trace with hash 1981222007, now seen corresponding path program 24 times [2018-10-22 16:13:24,565 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:13:24,566 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:24,566 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:13:24,566 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:24,566 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:13:24,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:13:28,539 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:28,539 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:28,539 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:13:28,540 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:13:28,540 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:13:28,540 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:28,540 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-22 16:13:28,547 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:13:28,547 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:13:28,627 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 71 check-sat command(s) [2018-10-22 16:13:28,627 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:28,635 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:28,872 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:28,872 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:35,787 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:35,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:35,807 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:13:35,823 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:13:35,823 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:13:36,589 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 71 check-sat command(s) [2018-10-22 16:13:36,589 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:36,595 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:36,668 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:36,669 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:36,931 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:36,932 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:13:36,933 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74, 74, 74] total 146 [2018-10-22 16:13:36,933 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:13:36,934 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2018-10-22 16:13:36,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2018-10-22 16:13:36,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7679, Invalid=13491, Unknown=0, NotChecked=0, Total=21170 [2018-10-22 16:13:36,935 INFO L87 Difference]: Start difference. First operand 223 states and 223 transitions. Second operand 76 states. [2018-10-22 16:13:37,212 WARN L179 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 210 DAG size of output: 8 [2018-10-22 16:13:37,398 WARN L179 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 8 [2018-10-22 16:13:37,617 WARN L179 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 9 [2018-10-22 16:13:37,844 WARN L179 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-10-22 16:13:38,082 WARN L179 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-10-22 16:13:38,317 WARN L179 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-10-22 16:13:38,545 WARN L179 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-10-22 16:13:38,784 WARN L179 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-10-22 16:13:39,018 WARN L179 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-10-22 16:13:39,258 WARN L179 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-10-22 16:13:39,497 WARN L179 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-10-22 16:13:39,738 WARN L179 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-10-22 16:13:39,974 WARN L179 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-22 16:13:40,213 WARN L179 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-22 16:13:40,455 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-22 16:13:40,706 WARN L179 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-22 16:13:40,973 WARN L179 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-22 16:13:41,214 WARN L179 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-22 16:13:41,462 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-22 16:13:41,711 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-22 16:13:41,964 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-22 16:13:42,223 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-22 16:13:42,474 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-22 16:13:42,720 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-22 16:13:42,972 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-22 16:13:43,216 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 Received shutdown request... [2018-10-22 16:13:44,707 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-22 16:13:44,707 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-22 16:13:44,711 WARN L205 ceAbstractionStarter]: Timeout [2018-10-22 16:13:44,711 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 04:13:44 BoogieIcfgContainer [2018-10-22 16:13:44,711 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-22 16:13:44,712 INFO L168 Benchmark]: Toolchain (without parser) took 245546.36 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 661.1 MB). Free memory was 1.4 GB in the beginning and 2.0 GB in the end (delta: -628.3 MB). Peak memory consumption was 32.8 MB. Max. memory is 7.1 GB. [2018-10-22 16:13:44,712 INFO L168 Benchmark]: CDTParser took 0.22 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. [2018-10-22 16:13:44,713 INFO L168 Benchmark]: CACSL2BoogieTranslator took 245.43 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. [2018-10-22 16:13:44,713 INFO L168 Benchmark]: Boogie Procedure Inliner took 21.48 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. [2018-10-22 16:13:44,713 INFO L168 Benchmark]: Boogie Preprocessor took 21.64 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. [2018-10-22 16:13:44,714 INFO L168 Benchmark]: RCFGBuilder took 332.31 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 719.3 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -771.3 MB). Peak memory consumption was 26.9 MB. Max. memory is 7.1 GB. [2018-10-22 16:13:44,714 INFO L168 Benchmark]: TraceAbstraction took 244921.19 ms. Allocated memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: -58.2 MB). Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 132.4 MB). Peak memory consumption was 74.2 MB. Max. memory is 7.1 GB. [2018-10-22 16:13:44,716 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 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. * CACSL2BoogieTranslator took 245.43 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 21.48 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 21.64 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. * RCFGBuilder took 332.31 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 719.3 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -771.3 MB). Peak memory consumption was 26.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 244921.19 ms. Allocated memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: -58.2 MB). Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 132.4 MB). Peak memory consumption was 74.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was constructing difference of abstraction (223states) and FLOYD_HOARE automaton (currently 34 states, 76 states before enhancement),while PredicateComparison was comparing new predicate (quantifier-free) to 178 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. TIMEOUT Result, 244.8s OverallTime, 26 OverallIterations, 71 TraceHistogramMax, 119.9s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 339 SDtfs, 3630 SDslu, 7976 SDs, 0 SdLazy, 3733 SolverSat, 2309 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 6.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 13144 GetRequests, 10286 SyntacticMatches, 108 SemanticMatches, 2749 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40426 ImplicationChecksByTransitivity, 215.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=223occurred in iteration=25, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 25 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 9.9s SatisfiabilityAnalysisTime, 112.0s InterpolantComputationTime, 8555 NumberOfCodeBlocks, 8555 NumberOfCodeBlocksAsserted, 1026 NumberOfCheckSat, 14121 ConstructedInterpolants, 142 QuantifiedInterpolants, 13440723 SizeOfPredicates, 144 NumberOfNonLiveVariables, 8208 ConjunctsInSsa, 1848 ConjunctsInUnsatCore, 122 InterpolantComputations, 2 PerfectInterpolantSequences, 0/306600 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown