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-lit/mcmillan2006_true-unreach-call_true-termination.c.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:09:24,475 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:09:24,477 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:09:24,494 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:09:24,495 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:09:24,496 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:09:24,498 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:09:24,501 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:09:24,508 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:09:24,509 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:09:24,514 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:09:24,514 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:09:24,515 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:09:24,518 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:09:24,521 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:09:24,522 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:09:24,523 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:09:24,524 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:09:24,529 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:09:24,533 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:09:24,535 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:09:24,536 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:09:24,542 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-22 16:09:24,542 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-22 16:09:24,542 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-22 16:09:24,543 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-22 16:09:24,545 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-22 16:09:24,545 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-22 16:09:24,548 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-22 16:09:24,550 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-22 16:09:24,550 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-22 16:09:24,551 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-22 16:09:24,553 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 16:09:24,572 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:09:24,572 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:09:24,573 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:09:24,573 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:09:24,573 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:09:24,573 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:09:24,574 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:09:24,574 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:09:24,574 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:09:24,574 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:09:24,574 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:09:24,575 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:09:24,575 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:09:24,576 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:09:24,576 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:09:24,576 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:09:24,576 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:09:24,576 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:09:24,577 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:09:24,577 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:09:24,577 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:09:24,577 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:09:24,577 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:09:24,578 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:09:24,578 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:09:24,578 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:09:24,578 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:09:24,579 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:09:24,579 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:09:24,579 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:09:24,579 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:09:24,579 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:09:24,580 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:09:24,580 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:09:24,620 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:09:24,635 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:09:24,639 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:09:24,641 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:09:24,641 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:09:24,642 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-lit/mcmillan2006_true-unreach-call_true-termination.c.i [2018-10-22 16:09:24,709 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/82ed3d65f/2b0b2f58544149429e160de4ec18e0b6/FLAG5d66d563d [2018-10-22 16:09:25,212 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:09:25,212 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/mcmillan2006_true-unreach-call_true-termination.c.i [2018-10-22 16:09:25,218 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/82ed3d65f/2b0b2f58544149429e160de4ec18e0b6/FLAG5d66d563d [2018-10-22 16:09:25,232 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/82ed3d65f/2b0b2f58544149429e160de4ec18e0b6 [2018-10-22 16:09:25,243 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:09:25,244 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:09:25,245 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:09:25,245 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:09:25,249 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:09:25,250 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:09:25" (1/1) ... [2018-10-22 16:09:25,253 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@436ba03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:25, skipping insertion in model container [2018-10-22 16:09:25,253 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:09:25" (1/1) ... [2018-10-22 16:09:25,263 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:09:25,285 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:09:25,464 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:09:25,475 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:09:25,494 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:09:25,509 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:09:25,510 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:25 WrapperNode [2018-10-22 16:09:25,510 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:09:25,511 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:09:25,511 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:09:25,511 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:09:25,520 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:25" (1/1) ... [2018-10-22 16:09:25,529 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:25" (1/1) ... [2018-10-22 16:09:25,550 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:09:25,550 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:09:25,550 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:09:25,551 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:09:25,558 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:25" (1/1) ... [2018-10-22 16:09:25,559 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:25" (1/1) ... [2018-10-22 16:09:25,560 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:25" (1/1) ... [2018-10-22 16:09:25,560 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:25" (1/1) ... [2018-10-22 16:09:25,565 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:25" (1/1) ... [2018-10-22 16:09:25,570 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:25" (1/1) ... [2018-10-22 16:09:25,571 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:25" (1/1) ... [2018-10-22 16:09:25,573 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:09:25,574 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:09:25,574 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:09:25,574 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:09:25,575 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:25" (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 16:09:25,702 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:09:25,702 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:09:25,702 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:09:25,702 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:09:25,702 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:09:25,702 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:09:25,703 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:09:25,703 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:09:26,074 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:09:26,075 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:09:26 BoogieIcfgContainer [2018-10-22 16:09:26,075 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:09:26,076 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:09:26,077 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:09:26,080 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:09:26,080 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:09:25" (1/3) ... [2018-10-22 16:09:26,081 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28df15a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:09:26, skipping insertion in model container [2018-10-22 16:09:26,081 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:25" (2/3) ... [2018-10-22 16:09:26,082 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28df15a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:09:26, skipping insertion in model container [2018-10-22 16:09:26,082 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:09:26" (3/3) ... [2018-10-22 16:09:26,084 INFO L112 eAbstractionObserver]: Analyzing ICFG mcmillan2006_true-unreach-call_true-termination.c.i [2018-10-22 16:09:26,094 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:09:26,102 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:09:26,120 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:09:26,153 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:09:26,154 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:09:26,154 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:09:26,154 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:09:26,155 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:09:26,155 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:09:26,155 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:09:26,155 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:09:26,155 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:09:26,175 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2018-10-22 16:09:26,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-22 16:09:26,182 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:26,183 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:26,185 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:26,191 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:26,194 INFO L82 PathProgramCache]: Analyzing trace with hash 235483989, now seen corresponding path program 1 times [2018-10-22 16:09:26,196 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:26,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:26,254 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:26,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:26,255 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:26,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:26,366 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 16:09:26,368 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:09:26,368 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:09:26,369 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:09:26,373 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:09:26,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:09:26,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:09:26,389 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2018-10-22 16:09:26,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:26,415 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2018-10-22 16:09:26,415 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:09:26,417 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-10-22 16:09:26,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:26,426 INFO L225 Difference]: With dead ends: 44 [2018-10-22 16:09:26,426 INFO L226 Difference]: Without dead ends: 22 [2018-10-22 16:09:26,430 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 16:09:26,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-22 16:09:26,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-22 16:09:26,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-22 16:09:26,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2018-10-22 16:09:26,466 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 15 [2018-10-22 16:09:26,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:26,466 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2018-10-22 16:09:26,467 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:09:26,467 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2018-10-22 16:09:26,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-22 16:09:26,468 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:26,468 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:26,468 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:26,469 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:26,469 INFO L82 PathProgramCache]: Analyzing trace with hash 1613839314, now seen corresponding path program 1 times [2018-10-22 16:09:26,469 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:26,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:26,471 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:26,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:26,471 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:26,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:26,632 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 16:09:26,632 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:09:26,633 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-22 16:09:26,633 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:09:26,634 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 16:09:26,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 16:09:26,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-10-22 16:09:26,635 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 5 states. [2018-10-22 16:09:26,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:26,770 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2018-10-22 16:09:26,773 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 16:09:26,773 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2018-10-22 16:09:26,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:26,774 INFO L225 Difference]: With dead ends: 39 [2018-10-22 16:09:26,774 INFO L226 Difference]: Without dead ends: 25 [2018-10-22 16:09:26,775 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2018-10-22 16:09:26,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-22 16:09:26,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2018-10-22 16:09:26,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-22 16:09:26,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-10-22 16:09:26,782 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 16 [2018-10-22 16:09:26,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:26,783 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-10-22 16:09:26,783 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 16:09:26,783 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-10-22 16:09:26,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-22 16:09:26,784 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:26,784 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:26,784 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:26,785 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:26,785 INFO L82 PathProgramCache]: Analyzing trace with hash -1557204615, now seen corresponding path program 1 times [2018-10-22 16:09:26,785 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:26,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:26,786 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:26,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:26,787 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:26,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:27,052 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 11 [2018-10-22 16:09:27,216 WARN L179 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 9 [2018-10-22 16:09:27,289 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 16:09:27,290 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:27,290 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:27,291 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-10-22 16:09:27,293 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [13], [16], [18], [20], [24], [28], [33], [43], [46], [48], [54], [55], [56], [58] [2018-10-22 16:09:27,344 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:09:27,344 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:09:28,360 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:09:28,367 INFO L272 AbstractInterpreter]: Visited 18 different actions 91 times. Merged at 7 different actions 48 times. Widened at 2 different actions 6 times. Found 1 fixpoints after 1 different actions. Largest state had 34 variables. [2018-10-22 16:09:28,401 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:28,402 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:09:28,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:28,403 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 16:09:28,418 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:28,418 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:28,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:28,468 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:28,563 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 8 [2018-10-22 16:09:28,574 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2018-10-22 16:09:28,574 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:09:28,579 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:28,583 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:28,583 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:11, output treesize:7 [2018-10-22 16:09:28,727 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2018-10-22 16:09:28,741 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2018-10-22 16:09:28,742 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:09:28,744 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:28,746 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:28,746 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:15, output treesize:3 [2018-10-22 16:09:28,802 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 16:09:28,802 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:28,973 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2018-10-22 16:09:28,995 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2018-10-22 16:09:28,996 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:09:29,001 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:29,003 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:29,003 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:14, output treesize:5 [2018-10-22 16:09:29,090 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 16:09:29,123 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:29,124 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 16:09:29,153 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:29,153 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:29,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:29,220 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:29,263 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 8 [2018-10-22 16:09:29,282 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2018-10-22 16:09:29,282 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:09:29,306 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:29,330 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:29,330 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:11, output treesize:7 [2018-10-22 16:09:29,347 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2018-10-22 16:09:29,363 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2018-10-22 16:09:29,363 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:09:29,389 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:29,411 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:29,411 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:15, output treesize:3 [2018-10-22 16:09:29,462 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 16:09:29,462 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:29,516 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2018-10-22 16:09:29,532 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2018-10-22 16:09:29,533 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:09:29,535 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:29,537 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:29,537 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:14, output treesize:5 [2018-10-22 16:09:29,560 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 16:09:29,563 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:29,563 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8, 8, 8] total 15 [2018-10-22 16:09:29,563 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:29,564 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 16:09:29,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 16:09:29,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2018-10-22 16:09:29,566 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 12 states. [2018-10-22 16:09:29,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:29,818 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2018-10-22 16:09:29,819 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 16:09:29,819 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2018-10-22 16:09:29,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:29,821 INFO L225 Difference]: With dead ends: 36 [2018-10-22 16:09:29,821 INFO L226 Difference]: Without dead ends: 34 [2018-10-22 16:09:29,822 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 62 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2018-10-22 16:09:29,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-22 16:09:29,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 31. [2018-10-22 16:09:29,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-22 16:09:29,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2018-10-22 16:09:29,830 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 19 [2018-10-22 16:09:29,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:29,830 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2018-10-22 16:09:29,830 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 16:09:29,830 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2018-10-22 16:09:29,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-22 16:09:29,831 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:29,832 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:29,832 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:29,832 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:29,833 INFO L82 PathProgramCache]: Analyzing trace with hash -1892261924, now seen corresponding path program 1 times [2018-10-22 16:09:29,833 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:29,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:29,834 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:29,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:29,834 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:29,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:29,955 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:29,956 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:29,956 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:29,956 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 29 with the following transitions: [2018-10-22 16:09:29,957 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [13], [16], [18], [20], [24], [28], [33], [35], [37], [43], [46], [48], [51], [53], [54], [55], [56], [58], [59] [2018-10-22 16:09:29,959 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:09:29,959 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:09:30,796 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:09:30,796 INFO L272 AbstractInterpreter]: Visited 23 different actions 194 times. Merged at 10 different actions 92 times. Widened at 3 different actions 12 times. Found 8 fixpoints after 3 different actions. Largest state had 35 variables. [2018-10-22 16:09:30,800 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:30,800 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:09:30,801 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:30,801 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 16:09:30,810 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:30,810 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:30,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:30,851 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:30,975 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:30,975 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:31,067 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:31,087 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:31,088 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 16:09:31,105 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:31,105 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:31,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:31,149 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:31,155 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:31,155 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:31,233 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:31,239 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:31,239 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 11 [2018-10-22 16:09:31,240 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:31,240 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:09:31,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:09:31,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2018-10-22 16:09:31,241 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2018-10-22 16:09:31,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:31,449 INFO L93 Difference]: Finished difference Result 54 states and 57 transitions. [2018-10-22 16:09:31,449 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 16:09:31,449 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2018-10-22 16:09:31,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:31,452 INFO L225 Difference]: With dead ends: 54 [2018-10-22 16:09:31,452 INFO L226 Difference]: Without dead ends: 35 [2018-10-22 16:09:31,453 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 102 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:09:31,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-10-22 16:09:31,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2018-10-22 16:09:31,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-22 16:09:31,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2018-10-22 16:09:31,464 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 28 [2018-10-22 16:09:31,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:31,465 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2018-10-22 16:09:31,465 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:09:31,465 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2018-10-22 16:09:31,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-22 16:09:31,466 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:31,466 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:31,466 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:31,467 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:31,467 INFO L82 PathProgramCache]: Analyzing trace with hash 2043007747, now seen corresponding path program 2 times [2018-10-22 16:09:31,467 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:31,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:31,468 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:31,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:31,469 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:31,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:31,675 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:31,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:31,675 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:31,676 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:31,676 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:31,676 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:31,676 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 16:09:31,685 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:31,685 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:31,712 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:31,713 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:31,716 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:31,727 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 12 [2018-10-22 16:09:31,729 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2018-10-22 16:09:31,730 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:09:31,732 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:31,739 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:09:31,740 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:22, output treesize:18 [2018-10-22 16:09:34,019 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2018-10-22 16:09:34,023 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 3 [2018-10-22 16:09:34,023 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:09:34,026 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:34,028 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:34,029 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:19, output treesize:3 [2018-10-22 16:09:34,085 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:34,085 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:36,244 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2018-10-22 16:09:36,258 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2018-10-22 16:09:36,259 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:09:36,262 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:36,263 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:36,263 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:16, output treesize:5 [2018-10-22 16:09:36,272 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:36,292 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:36,292 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 16:09:36,308 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:36,308 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:36,361 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:36,362 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:36,366 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:36,459 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 12 [2018-10-22 16:09:36,465 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2018-10-22 16:09:36,466 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:09:36,468 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:36,473 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:36,474 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:19, output treesize:15 [2018-10-22 16:09:51,275 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2018-10-22 16:09:51,292 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:09:51,293 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2018-10-22 16:09:51,294 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:09:51,297 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:51,303 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:51,304 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 5 variables, input treesize:32, output treesize:3 [2018-10-22 16:09:51,315 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:51,316 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:53,929 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2018-10-22 16:09:54,163 WARN L179 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 15 [2018-10-22 16:09:54,181 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 3 [2018-10-22 16:09:54,182 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:09:54,213 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:54,242 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:54,243 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:24, output treesize:7 [2018-10-22 16:09:54,316 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:54,320 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:54,320 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 13, 10, 13, 12] total 31 [2018-10-22 16:09:54,320 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:54,320 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 16:09:54,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 16:09:54,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=810, Unknown=8, NotChecked=0, Total=930 [2018-10-22 16:09:54,322 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 17 states. [2018-10-22 16:09:56,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:56,893 INFO L93 Difference]: Finished difference Result 48 states and 49 transitions. [2018-10-22 16:09:56,893 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 16:09:56,893 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2018-10-22 16:09:56,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:56,894 INFO L225 Difference]: With dead ends: 48 [2018-10-22 16:09:56,894 INFO L226 Difference]: Without dead ends: 46 [2018-10-22 16:09:56,896 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 90 SyntacticMatches, 16 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 386 ImplicationChecksByTransitivity, 22.2s TimeCoverageRelationStatistics Valid=177, Invalid=1221, Unknown=8, NotChecked=0, Total=1406 [2018-10-22 16:09:56,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-22 16:09:56,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2018-10-22 16:09:56,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-22 16:09:56,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2018-10-22 16:09:56,905 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 31 [2018-10-22 16:09:56,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:56,905 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2018-10-22 16:09:56,905 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 16:09:56,905 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2018-10-22 16:09:56,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-22 16:09:56,907 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:56,907 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:56,907 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:56,907 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:56,908 INFO L82 PathProgramCache]: Analyzing trace with hash -43804270, now seen corresponding path program 3 times [2018-10-22 16:09:56,908 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:56,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:56,909 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:56,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:56,909 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:56,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:57,034 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:09:57,035 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:57,035 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:57,035 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:57,035 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:57,036 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:57,036 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 16:09:57,047 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:57,048 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:57,105 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-22 16:09:57,106 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:57,111 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:57,209 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:09:57,209 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:57,274 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:09:57,295 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:57,295 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 16:09:57,311 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:57,311 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:57,392 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-22 16:09:57,392 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:57,398 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:57,408 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:09:57,409 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:57,760 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:09:57,762 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:57,762 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 14 [2018-10-22 16:09:57,762 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:57,763 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 16:09:57,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 16:09:57,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:09:57,764 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 13 states. [2018-10-22 16:09:57,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:57,902 INFO L93 Difference]: Finished difference Result 71 states and 75 transitions. [2018-10-22 16:09:57,903 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 16:09:57,903 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 40 [2018-10-22 16:09:57,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:57,904 INFO L225 Difference]: With dead ends: 71 [2018-10-22 16:09:57,904 INFO L226 Difference]: Without dead ends: 47 [2018-10-22 16:09:57,905 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 145 SyntacticMatches, 10 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=82, Invalid=224, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:09:57,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-10-22 16:09:57,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2018-10-22 16:09:57,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-22 16:09:57,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2018-10-22 16:09:57,913 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 40 [2018-10-22 16:09:57,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:57,913 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2018-10-22 16:09:57,913 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 16:09:57,913 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2018-10-22 16:09:57,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-22 16:09:57,915 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:57,915 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:57,915 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:57,915 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:57,916 INFO L82 PathProgramCache]: Analyzing trace with hash -1152087495, now seen corresponding path program 4 times [2018-10-22 16:09:57,916 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:57,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:57,917 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:57,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:57,917 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:57,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:59,233 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 3 proven. 30 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:09:59,234 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:59,234 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:59,234 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:59,234 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:59,234 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:59,235 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 16:09:59,246 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:59,246 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:59,292 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:59,293 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:59,297 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:59,486 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 12 [2018-10-22 16:09:59,500 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2018-10-22 16:09:59,501 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:09:59,526 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:09:59,607 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:09:59,608 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:26, output treesize:22 [2018-10-22 16:10:08,080 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2018-10-22 16:10:08,104 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:10:08,105 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2018-10-22 16:10:08,106 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:10:08,117 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:08,119 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:08,119 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:21, output treesize:3 [2018-10-22 16:10:08,157 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:10:08,157 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:10,226 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2018-10-22 16:10:10,242 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 3 [2018-10-22 16:10:10,242 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:10:10,245 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:10,246 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:10,246 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:18, output treesize:5 [2018-10-22 16:10:10,410 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 26 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:10:10,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:10,431 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 16:10:10,447 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:10,448 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:10,529 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:10,529 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:10,538 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:10,653 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 12 [2018-10-22 16:10:10,655 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2018-10-22 16:10:10,655 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:10:10,657 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:10,662 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:10:10,662 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:26, output treesize:22 [2018-10-22 16:10:18,985 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2018-10-22 16:10:18,986 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:10:18,987 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2018-10-22 16:10:18,987 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:10:18,989 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:18,991 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:18,991 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:21, output treesize:3 [2018-10-22 16:10:19,006 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:10:19,006 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:19,056 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2018-10-22 16:10:19,067 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 3 [2018-10-22 16:10:19,068 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:10:19,070 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:19,071 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:19,071 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:18, output treesize:5 [2018-10-22 16:10:19,085 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 26 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (11)] Exception during sending of exit command (exit): Broken pipe [2018-10-22 16:10:19,094 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:19,094 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 12, 13, 12] total 19 [2018-10-22 16:10:19,094 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:19,096 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 16:10:19,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 16:10:19,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=292, Unknown=3, NotChecked=0, Total=342 [2018-10-22 16:10:19,097 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 18 states. [2018-10-22 16:10:23,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:23,566 INFO L93 Difference]: Finished difference Result 60 states and 61 transitions. [2018-10-22 16:10:23,566 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 16:10:23,566 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2018-10-22 16:10:23,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:23,567 INFO L225 Difference]: With dead ends: 60 [2018-10-22 16:10:23,567 INFO L226 Difference]: Without dead ends: 58 [2018-10-22 16:10:23,568 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 138 SyntacticMatches, 33 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 20.6s TimeCoverageRelationStatistics Valid=108, Invalid=645, Unknown=3, NotChecked=0, Total=756 [2018-10-22 16:10:23,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-22 16:10:23,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 55. [2018-10-22 16:10:23,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-10-22 16:10:23,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2018-10-22 16:10:23,575 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 43 [2018-10-22 16:10:23,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:23,575 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2018-10-22 16:10:23,575 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 16:10:23,575 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2018-10-22 16:10:23,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-22 16:10:23,576 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:23,577 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:23,577 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:23,577 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:23,577 INFO L82 PathProgramCache]: Analyzing trace with hash -1561288932, now seen corresponding path program 5 times [2018-10-22 16:10:23,577 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:23,578 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:23,578 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:23,579 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:23,579 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:23,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:23,799 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 18 proven. 27 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:10:23,800 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:23,800 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:23,800 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:23,800 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:23,801 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:23,801 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 16:10:23,809 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:23,809 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:23,839 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2018-10-22 16:10:23,839 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:23,843 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:23,953 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 30 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:10:23,953 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:24,028 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 30 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:10:24,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:24,049 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 16:10:24,064 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:24,065 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:24,156 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2018-10-22 16:10:24,157 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:24,161 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:24,170 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 30 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:10:24,171 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:24,270 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 30 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:10:24,272 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:24,272 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 17 [2018-10-22 16:10:24,272 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:24,273 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:10:24,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:10:24,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2018-10-22 16:10:24,274 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 16 states. [2018-10-22 16:10:24,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:24,543 INFO L93 Difference]: Finished difference Result 88 states and 93 transitions. [2018-10-22 16:10:24,544 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 16:10:24,544 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 52 [2018-10-22 16:10:24,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:24,546 INFO L225 Difference]: With dead ends: 88 [2018-10-22 16:10:24,546 INFO L226 Difference]: Without dead ends: 59 [2018-10-22 16:10:24,547 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 188 SyntacticMatches, 14 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=344, Unknown=0, NotChecked=0, Total=462 [2018-10-22 16:10:24,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-10-22 16:10:24,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2018-10-22 16:10:24,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-22 16:10:24,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2018-10-22 16:10:24,561 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 52 [2018-10-22 16:10:24,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:24,562 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2018-10-22 16:10:24,562 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:10:24,562 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2018-10-22 16:10:24,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-22 16:10:24,565 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:24,565 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:24,565 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:24,566 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:24,566 INFO L82 PathProgramCache]: Analyzing trace with hash 1718799683, now seen corresponding path program 6 times [2018-10-22 16:10:24,566 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:24,567 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:24,567 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:24,567 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:24,567 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:24,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:25,090 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 5 proven. 57 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-22 16:10:25,090 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:25,090 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:25,090 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:25,090 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:25,090 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:25,090 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 16:10:25,098 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:25,098 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:25,131 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2018-10-22 16:10:25,131 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:25,134 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:25,207 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 10 [2018-10-22 16:10:25,209 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 9 [2018-10-22 16:10:25,210 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:10:25,211 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:25,215 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:25,216 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:17, output treesize:13 [2018-10-22 16:10:25,608 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2018-10-22 16:10:25,610 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2018-10-22 16:10:25,610 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:10:25,612 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:25,613 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:25,613 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:15, output treesize:3 [2018-10-22 16:10:25,664 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:10:25,665 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:25,786 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2018-10-22 16:10:25,801 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 3 [2018-10-22 16:10:25,802 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:10:25,806 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:25,807 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:25,807 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:18, output treesize:5 [2018-10-22 16:10:25,829 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 6 proven. 50 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:10:25,849 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:25,849 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 16:10:25,864 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:25,864 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:25,991 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2018-10-22 16:10:25,991 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:25,996 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:26,104 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 12 [2018-10-22 16:10:26,108 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2018-10-22 16:10:26,109 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:10:26,111 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:26,115 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:26,115 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:19, output treesize:15 [2018-10-22 16:10:28,184 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2018-10-22 16:10:28,188 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:10:28,188 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2018-10-22 16:10:28,189 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:10:28,191 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:28,198 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:28,198 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 5 variables, input treesize:32, output treesize:3 [2018-10-22 16:10:28,219 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 21 proven. 35 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:10:28,219 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:28,808 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2018-10-22 16:10:28,823 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 3 [2018-10-22 16:10:28,823 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:10:28,825 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:28,831 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:28,831 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:25, output treesize:7 [2018-10-22 16:10:28,975 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 21 proven. 35 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:10:28,976 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:28,977 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 14, 17, 16] total 47 [2018-10-22 16:10:28,977 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:28,977 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-22 16:10:28,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-22 16:10:28,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=1942, Unknown=0, NotChecked=0, Total=2162 [2018-10-22 16:10:28,978 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand 27 states. [2018-10-22 16:10:30,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:30,103 INFO L93 Difference]: Finished difference Result 72 states and 73 transitions. [2018-10-22 16:10:30,103 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 16:10:30,103 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 55 [2018-10-22 16:10:30,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:30,104 INFO L225 Difference]: With dead ends: 72 [2018-10-22 16:10:30,104 INFO L226 Difference]: Without dead ends: 70 [2018-10-22 16:10:30,105 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 164 SyntacticMatches, 29 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1133 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=313, Invalid=2879, Unknown=0, NotChecked=0, Total=3192 [2018-10-22 16:10:30,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-22 16:10:30,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 67. [2018-10-22 16:10:30,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-10-22 16:10:30,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2018-10-22 16:10:30,115 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 55 [2018-10-22 16:10:30,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:30,115 INFO L481 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2018-10-22 16:10:30,116 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-22 16:10:30,116 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2018-10-22 16:10:30,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-22 16:10:30,117 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:30,117 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:30,117 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:30,117 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:30,118 INFO L82 PathProgramCache]: Analyzing trace with hash 1561077586, now seen corresponding path program 7 times [2018-10-22 16:10:30,118 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:30,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:30,119 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:30,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:30,119 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:30,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:30,303 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 33 proven. 43 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:10:30,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:30,304 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:30,304 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:30,304 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:30,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:30,304 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 16:10:30,312 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:30,312 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:30,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:30,352 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:30,538 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 50 proven. 26 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:10:30,538 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:30,633 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 50 proven. 26 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:10:30,655 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:30,655 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 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 16:10:30,670 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:30,670 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:30,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:30,743 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:30,753 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 50 proven. 26 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:10:30,753 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:30,836 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 50 proven. 26 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:10:30,838 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:30,838 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 20 [2018-10-22 16:10:30,838 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:30,839 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-22 16:10:30,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-22 16:10:30,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:10:30,840 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 19 states. [2018-10-22 16:10:31,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:31,056 INFO L93 Difference]: Finished difference Result 105 states and 111 transitions. [2018-10-22 16:10:31,057 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 16:10:31,057 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 64 [2018-10-22 16:10:31,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:31,058 INFO L225 Difference]: With dead ends: 105 [2018-10-22 16:10:31,058 INFO L226 Difference]: Without dead ends: 71 [2018-10-22 16:10:31,059 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 231 SyntacticMatches, 18 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=161, Invalid=489, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:10:31,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2018-10-22 16:10:31,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2018-10-22 16:10:31,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-10-22 16:10:31,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2018-10-22 16:10:31,067 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 64 [2018-10-22 16:10:31,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:31,067 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2018-10-22 16:10:31,067 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-22 16:10:31,068 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2018-10-22 16:10:31,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-22 16:10:31,069 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:31,069 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:31,069 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:31,069 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:31,069 INFO L82 PathProgramCache]: Analyzing trace with hash -827370759, now seen corresponding path program 8 times [2018-10-22 16:10:31,069 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:31,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:31,070 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:31,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:31,070 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:31,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:32,040 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 7 proven. 92 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:10:32,040 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:32,040 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:32,040 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:32,040 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:32,040 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:32,041 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 16:10:32,048 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:32,048 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:32,094 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:32,094 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:32,097 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:32,185 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 12 [2018-10-22 16:10:32,187 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2018-10-22 16:10:32,187 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:10:32,189 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:10:32,194 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:10:32,194 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:22, output treesize:18 [2018-10-22 16:11:04,676 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2018-10-22 16:11:04,678 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 3 [2018-10-22 16:11:04,679 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:11:04,680 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:11:04,680 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:11:04,681 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:19, output treesize:3 [2018-10-22 16:11:04,736 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:11:04,737 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:06,886 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2018-10-22 16:11:06,931 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2018-10-22 16:11:06,931 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:11:06,939 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:11:06,940 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:11:06,940 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:16, output treesize:5 [2018-10-22 16:11:06,955 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 8 proven. 82 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:11:06,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:06,976 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 16:11:06,991 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:11:06,991 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:07,075 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:11:07,076 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:07,082 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:07,125 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 12 [2018-10-22 16:11:07,141 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2018-10-22 16:11:07,142 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:11:07,165 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:11:07,204 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:11:07,204 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:22, output treesize:18 [2018-10-22 16:11:39,601 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2018-10-22 16:11:39,603 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 3 [2018-10-22 16:11:39,603 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:11:39,604 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:11:39,605 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:11:39,605 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:19, output treesize:3 [2018-10-22 16:11:39,624 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:11:39,625 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:39,881 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2018-10-22 16:11:39,895 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 3 [2018-10-22 16:11:39,896 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:11:39,897 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:11:39,898 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:11:39,899 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:15, output treesize:5 [2018-10-22 16:11:39,916 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 8 proven. 82 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:11:39,918 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:39,918 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 19, 16, 17, 16] total 27 [2018-10-22 16:11:39,918 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:39,919 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-22 16:11:39,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-22 16:11:39,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=624, Unknown=5, NotChecked=0, Total=702 [2018-10-22 16:11:39,921 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand 26 states. [2018-10-22 16:11:49,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:49,098 INFO L93 Difference]: Finished difference Result 84 states and 85 transitions. [2018-10-22 16:11:49,099 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-22 16:11:49,099 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 67 [2018-10-22 16:11:49,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:49,100 INFO L225 Difference]: With dead ends: 84 [2018-10-22 16:11:49,100 INFO L226 Difference]: Without dead ends: 82 [2018-10-22 16:11:49,101 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 223 SyntacticMatches, 37 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 469 ImplicationChecksByTransitivity, 68.6s TimeCoverageRelationStatistics Valid=149, Invalid=1178, Unknown=5, NotChecked=0, Total=1332 [2018-10-22 16:11:49,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-10-22 16:11:49,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 79. [2018-10-22 16:11:49,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-22 16:11:49,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-10-22 16:11:49,109 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 67 [2018-10-22 16:11:49,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:49,110 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-10-22 16:11:49,110 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-22 16:11:49,110 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-10-22 16:11:49,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-22 16:11:49,112 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:49,112 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:49,112 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:49,112 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:49,112 INFO L82 PathProgramCache]: Analyzing trace with hash 1280028252, now seen corresponding path program 9 times [2018-10-22 16:11:49,112 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:49,113 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:49,113 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:49,113 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:49,113 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:49,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:49,258 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 53 proven. 62 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:11:49,259 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:49,259 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:49,259 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:49,259 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:49,259 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:49,259 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 16:11:49,267 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:11:49,267 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:11:49,305 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-22 16:11:49,306 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:49,309 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:49,416 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 75 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:11:49,416 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:50,021 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 75 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:11:50,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:50,041 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 16:11:50,060 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:11:50,061 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:11:50,253 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-22 16:11:50,253 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:50,258 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:50,268 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 75 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:11:50,268 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:50,361 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 75 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:11:50,363 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:50,363 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 23 [2018-10-22 16:11:50,363 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:50,363 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 16:11:50,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 16:11:50,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=382, Unknown=0, NotChecked=0, Total=506 [2018-10-22 16:11:50,364 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 22 states. [2018-10-22 16:11:50,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:50,597 INFO L93 Difference]: Finished difference Result 122 states and 129 transitions. [2018-10-22 16:11:50,597 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:11:50,597 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 76 [2018-10-22 16:11:50,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:50,598 INFO L225 Difference]: With dead ends: 122 [2018-10-22 16:11:50,599 INFO L226 Difference]: Without dead ends: 83 [2018-10-22 16:11:50,599 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 324 GetRequests, 274 SyntacticMatches, 22 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 467 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=211, Invalid=659, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:11:50,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-10-22 16:11:50,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2018-10-22 16:11:50,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-10-22 16:11:50,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2018-10-22 16:11:50,608 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 76 [2018-10-22 16:11:50,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:50,608 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2018-10-22 16:11:50,608 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 16:11:50,608 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2018-10-22 16:11:50,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-22 16:11:50,609 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:50,610 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:50,610 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:50,610 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:50,610 INFO L82 PathProgramCache]: Analyzing trace with hash -83912829, now seen corresponding path program 10 times [2018-10-22 16:11:50,610 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:50,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:50,611 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:50,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:50,611 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:50,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:51,000 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 9 proven. 135 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-22 16:11:51,001 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:51,001 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:51,001 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:51,001 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:51,001 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:51,001 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 16:11:51,010 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:11:51,010 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:11:51,056 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:11:51,057 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:51,060 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:51,120 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 12 [2018-10-22 16:11:51,135 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2018-10-22 16:11:51,135 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:11:51,160 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:11:51,254 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:11:51,255 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:22, output treesize:18 [2018-10-22 16:12:41,980 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2018-10-22 16:12:41,984 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 3 [2018-10-22 16:12:41,984 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:12:41,995 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:12:41,995 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:12:41,996 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:19, output treesize:3 [2018-10-22 16:12:42,056 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:12:42,056 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:44,249 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2018-10-22 16:12:44,284 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2018-10-22 16:12:44,285 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:12:44,286 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:12:44,287 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:12:44,287 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:16, output treesize:5 [2018-10-22 16:12:44,307 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 10 proven. 122 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:12:44,327 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:44,328 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 16:12:44,357 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:12:44,357 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:12:44,524 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:12:44,524 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:44,529 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:44,540 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 12 [2018-10-22 16:12:44,550 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2018-10-22 16:12:44,551 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:12:44,552 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:12:44,557 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 16:12:44,557 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:22, output treesize:18 [2018-10-22 16:13:35,012 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2018-10-22 16:13:35,015 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 3 [2018-10-22 16:13:35,015 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:13:35,022 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:13:35,023 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:13:35,023 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:19, output treesize:3 [2018-10-22 16:13:35,048 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:13:35,048 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:35,160 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2018-10-22 16:13:35,172 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2018-10-22 16:13:35,172 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:13:35,174 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:13:35,175 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:13:35,175 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:16, output treesize:5 [2018-10-22 16:13:35,287 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 10 proven. 122 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:13:35,289 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:13:35,290 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 18, 19, 18] total 28 [2018-10-22 16:13:35,290 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:13:35,290 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-22 16:13:35,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-22 16:13:35,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=676, Unknown=6, NotChecked=0, Total=756 [2018-10-22 16:13:35,291 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand 27 states. [2018-10-22 16:13:46,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:13:46,250 INFO L93 Difference]: Finished difference Result 96 states and 97 transitions. [2018-10-22 16:13:46,250 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-22 16:13:46,251 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 79 [2018-10-22 16:13:46,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:13:46,252 INFO L225 Difference]: With dead ends: 96 [2018-10-22 16:13:46,252 INFO L226 Difference]: Without dead ends: 94 [2018-10-22 16:13:46,253 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 265 SyntacticMatches, 45 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 104.0s TimeCoverageRelationStatistics Valid=159, Invalid=1395, Unknown=6, NotChecked=0, Total=1560 [2018-10-22 16:13:46,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-10-22 16:13:46,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 91. [2018-10-22 16:13:46,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-10-22 16:13:46,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2018-10-22 16:13:46,261 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 79 [2018-10-22 16:13:46,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:13:46,261 INFO L481 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2018-10-22 16:13:46,262 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-22 16:13:46,262 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2018-10-22 16:13:46,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-10-22 16:13:46,263 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:13:46,263 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:13:46,263 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:13:46,263 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:13:46,263 INFO L82 PathProgramCache]: Analyzing trace with hash 731833618, now seen corresponding path program 11 times [2018-10-22 16:13:46,263 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:13:46,264 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:46,264 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:13:46,264 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:46,264 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:13:46,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:13:46,456 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 78 proven. 84 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:13:46,456 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:46,456 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:13:46,456 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:13:46,456 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:13:46,456 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:46,456 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 16:13:46,464 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:13:46,464 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:13:46,519 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-10-22 16:13:46,520 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:46,522 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:46,660 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 105 proven. 57 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:13:46,660 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:47,119 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 105 proven. 57 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:13:47,139 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:47,139 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 16:13:47,155 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:13:47,155 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:13:47,348 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-10-22 16:13:47,348 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:47,353 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:47,364 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 105 proven. 57 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:13:47,365 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:47,465 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 105 proven. 57 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:13:47,467 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:13:47,467 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 26 [2018-10-22 16:13:47,467 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:13:47,468 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-22 16:13:47,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-22 16:13:47,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=493, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:13:47,469 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand 25 states. [2018-10-22 16:13:47,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:13:47,734 INFO L93 Difference]: Finished difference Result 139 states and 147 transitions. [2018-10-22 16:13:47,735 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 16:13:47,735 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 88 [2018-10-22 16:13:47,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:13:47,736 INFO L225 Difference]: With dead ends: 139 [2018-10-22 16:13:47,736 INFO L226 Difference]: Without dead ends: 95 [2018-10-22 16:13:47,738 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 375 GetRequests, 317 SyntacticMatches, 26 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 624 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=268, Invalid=854, Unknown=0, NotChecked=0, Total=1122 [2018-10-22 16:13:47,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-10-22 16:13:47,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2018-10-22 16:13:47,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-10-22 16:13:47,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2018-10-22 16:13:47,746 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 88 [2018-10-22 16:13:47,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:13:47,746 INFO L481 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2018-10-22 16:13:47,746 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-22 16:13:47,746 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2018-10-22 16:13:47,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-10-22 16:13:47,747 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:13:47,748 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:13:47,748 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:13:47,748 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:13:47,748 INFO L82 PathProgramCache]: Analyzing trace with hash -55358535, now seen corresponding path program 12 times [2018-10-22 16:13:47,748 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:13:47,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:47,749 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:13:47,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:47,749 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:13:47,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:13:48,223 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 11 proven. 186 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-22 16:13:48,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:48,223 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:13:48,224 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:13:48,224 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:13:48,224 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:48,224 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 16:13:48,242 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:13:48,243 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:13:48,364 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2018-10-22 16:13:48,364 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:48,367 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:48,494 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 12 [2018-10-22 16:13:48,495 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2018-10-22 16:13:48,495 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:13:48,497 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:13:48,502 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:13:48,502 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:19, output treesize:15 [2018-10-22 16:13:51,504 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2018-10-22 16:13:51,507 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:13:51,507 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2018-10-22 16:13:51,508 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:13:51,510 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:13:51,517 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:13:51,517 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 5 variables, input treesize:32, output treesize:3 [2018-10-22 16:13:51,875 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 87 proven. 95 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:13:51,875 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:52,682 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2018-10-22 16:13:52,696 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 3 [2018-10-22 16:13:52,696 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:13:52,698 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:13:52,704 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:13:52,704 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:25, output treesize:7 [2018-10-22 16:13:52,846 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 87 proven. 95 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:13:52,867 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:52,867 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 16:13:52,882 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:13:52,882 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:13:53,249 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2018-10-22 16:13:53,250 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:53,256 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:53,263 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 12 [2018-10-22 16:13:53,264 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2018-10-22 16:13:53,264 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:13:53,266 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:13:53,274 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:13:53,274 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:19, output treesize:15 [2018-10-22 16:13:55,851 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2018-10-22 16:13:55,852 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 16:13:55,853 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2018-10-22 16:13:55,853 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:13:55,855 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:13:55,862 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:13:55,863 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 5 variables, input treesize:32, output treesize:3 [2018-10-22 16:13:55,903 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 87 proven. 95 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:13:55,904 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:56,075 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2018-10-22 16:13:56,113 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 3 [2018-10-22 16:13:56,113 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 16:13:56,115 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:13:56,121 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 16:13:56,121 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:24, output treesize:7 [2018-10-22 16:13:56,304 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 87 proven. 95 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:13:56,306 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:13:56,306 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 23, 22, 23, 22] total 51 [2018-10-22 16:13:56,306 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:13:56,307 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-22 16:13:56,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-22 16:13:56,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=2269, Unknown=0, NotChecked=0, Total=2550 [2018-10-22 16:13:56,309 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand 41 states. Received shutdown request... [2018-10-22 16:14:01,211 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-22 16:14:01,212 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-22 16:14:01,216 WARN L205 ceAbstractionStarter]: Timeout [2018-10-22 16:14:01,216 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 04:14:01 BoogieIcfgContainer [2018-10-22 16:14:01,216 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-22 16:14:01,217 INFO L168 Benchmark]: Toolchain (without parser) took 275974.03 ms. Allocated memory was 1.5 GB in the beginning and 2.5 GB in the end (delta: 965.7 MB). Free memory was 1.4 GB in the beginning and 1.8 GB in the end (delta: -413.0 MB). Peak memory consumption was 552.8 MB. Max. memory is 7.1 GB. [2018-10-22 16:14:01,218 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:14:01,218 INFO L168 Benchmark]: CACSL2BoogieTranslator took 265.05 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 16:14:01,218 INFO L168 Benchmark]: Boogie Procedure Inliner took 39.28 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 16:14:01,218 INFO L168 Benchmark]: Boogie Preprocessor took 23.18 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 16:14:01,218 INFO L168 Benchmark]: RCFGBuilder took 501.80 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 755.0 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -803.3 MB). Peak memory consumption was 15.0 MB. Max. memory is 7.1 GB. [2018-10-22 16:14:01,219 INFO L168 Benchmark]: TraceAbstraction took 275140.10 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 210.8 MB). Free memory was 2.2 GB in the beginning and 1.8 GB in the end (delta: 379.8 MB). Peak memory consumption was 590.5 MB. Max. memory is 7.1 GB. [2018-10-22 16:14:01,220 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 265.05 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 39.28 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 23.18 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 501.80 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 755.0 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -803.3 MB). Peak memory consumption was 15.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 275140.10 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 210.8 MB). Free memory was 2.2 GB in the beginning and 1.8 GB in the end (delta: 379.8 MB). Peak memory consumption was 590.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 6]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 6). Cancelled while BasicCegarLoop was constructing difference of abstraction (94states) and FLOYD_HOARE automaton (currently 37 states, 41 states before enhancement),while PredicateComparison was comparing new predicate (quantified with 0quantifier alternations) to 82 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. TIMEOUT Result, 275.0s OverallTime, 15 OverallIterations, 8 TraceHistogramMax, 35.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 433 SDtfs, 478 SDslu, 4037 SDs, 0 SdLazy, 4088 SolverSat, 315 SolverUnsat, 13 SolverUnknown, 0 SolverNotchecked, 30.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 3226 GetRequests, 2494 SyntacticMatches, 309 SemanticMatches, 422 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6593 ImplicationChecksByTransitivity, 233.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=94occurred in iteration=14, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 1.9s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 14 MinimizatonAttempts, 25 StatesRemovedByMinimization, 13 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 2.2s SatisfiabilityAnalysisTime, 234.4s InterpolantComputationTime, 2230 NumberOfCodeBlocks, 2230 NumberOfCodeBlocksAsserted, 103 NumberOfCheckSat, 3629 ConstructedInterpolants, 364 QuantifiedInterpolants, 1438651 SizeOfPredicates, 299 NumberOfNonLiveVariables, 5442 ConjunctsInSsa, 690 ConjunctsInUnsatCore, 67 InterpolantComputations, 2 PerfectInterpolantSequences, 3141/6055 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown