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-acceleration/phases_true-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:04:57,252 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:04:57,254 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:04:57,265 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:04:57,266 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:04:57,267 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:04:57,268 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:04:57,270 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:04:57,271 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:04:57,272 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:04:57,273 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:04:57,273 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:04:57,274 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:04:57,275 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:04:57,276 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:04:57,277 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:04:57,278 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:04:57,280 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:04:57,282 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:04:57,284 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:04:57,285 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:04:57,286 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:04:57,289 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-22 16:04:57,289 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-22 16:04:57,289 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-22 16:04:57,290 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-22 16:04:57,291 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-22 16:04:57,292 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-22 16:04:57,293 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-22 16:04:57,294 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-22 16:04:57,294 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-22 16:04:57,295 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-22 16:04:57,298 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 16:04:57,313 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:04:57,314 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:04:57,314 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:04:57,315 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:04:57,315 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:04:57,315 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:04:57,315 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:04:57,316 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:04:57,316 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:04:57,316 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:04:57,316 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:04:57,317 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:04:57,317 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:04:57,318 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:04:57,318 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:04:57,318 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:04:57,318 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:04:57,318 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:04:57,319 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:04:57,319 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:04:57,319 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:04:57,321 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:04:57,321 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:04:57,321 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:04:57,321 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:04:57,322 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:04:57,322 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:04:57,322 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:04:57,322 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:04:57,322 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:04:57,323 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:04:57,323 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:04:57,324 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:04:57,324 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:04:57,393 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:04:57,410 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:04:57,415 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:04:57,416 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:04:57,417 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:04:57,417 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/phases_true-unreach-call1.i [2018-10-22 16:04:57,485 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/4564f8dcc/51c0fb22af8549ab983c176822573bfc/FLAG0df59abbc [2018-10-22 16:04:57,917 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:04:57,918 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_true-unreach-call1.i [2018-10-22 16:04:57,925 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/4564f8dcc/51c0fb22af8549ab983c176822573bfc/FLAG0df59abbc [2018-10-22 16:04:57,941 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/4564f8dcc/51c0fb22af8549ab983c176822573bfc [2018-10-22 16:04:57,956 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:04:57,957 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:04:57,959 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:04:57,959 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:04:57,965 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:04:57,966 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:04:57" (1/1) ... [2018-10-22 16:04:57,968 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@48de4ead and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:57, skipping insertion in model container [2018-10-22 16:04:57,969 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:04:57" (1/1) ... [2018-10-22 16:04:57,979 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:04:58,001 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:04:58,158 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:04:58,162 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:04:58,178 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:04:58,193 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:04:58,194 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:58 WrapperNode [2018-10-22 16:04:58,194 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:04:58,195 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:04:58,195 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:04:58,195 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:04:58,204 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:58" (1/1) ... [2018-10-22 16:04:58,210 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:58" (1/1) ... [2018-10-22 16:04:58,215 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:04:58,216 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:04:58,216 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:04:58,216 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:04:58,225 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:58" (1/1) ... [2018-10-22 16:04:58,226 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:58" (1/1) ... [2018-10-22 16:04:58,226 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:58" (1/1) ... [2018-10-22 16:04:58,227 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:58" (1/1) ... [2018-10-22 16:04:58,230 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:58" (1/1) ... [2018-10-22 16:04:58,235 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:58" (1/1) ... [2018-10-22 16:04:58,236 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:58" (1/1) ... [2018-10-22 16:04:58,237 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:04:58,238 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:04:58,238 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:04:58,238 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:04:58,239 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:58" (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 16:04:58,379 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:04:58,379 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:04:58,379 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:04:58,379 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:04:58,380 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:04:58,380 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:04:58,380 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:04:58,380 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:04:58,572 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:04:58,572 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:04:58 BoogieIcfgContainer [2018-10-22 16:04:58,573 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:04:58,573 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:04:58,574 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:04:58,577 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:04:58,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:04:57" (1/3) ... [2018-10-22 16:04:58,578 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3377f00d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:04:58, skipping insertion in model container [2018-10-22 16:04:58,578 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:58" (2/3) ... [2018-10-22 16:04:58,578 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3377f00d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:04:58, skipping insertion in model container [2018-10-22 16:04:58,578 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:04:58" (3/3) ... [2018-10-22 16:04:58,580 INFO L112 eAbstractionObserver]: Analyzing ICFG phases_true-unreach-call1.i [2018-10-22 16:04:58,589 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:04:58,595 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:04:58,612 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:04:58,647 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:04:58,648 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:04:58,648 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:04:58,649 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:04:58,649 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:04:58,649 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:04:58,649 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:04:58,649 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:04:58,650 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:04:58,668 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-10-22 16:04:58,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-22 16:04:58,673 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:58,674 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:58,677 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:58,682 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:58,682 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-10-22 16:04:58,684 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:58,727 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:58,727 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:58,727 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:58,727 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:58,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:58,781 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 16:04:58,783 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:04:58,783 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:04:58,783 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:04:58,787 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:04:58,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:04:58,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:04:58,801 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-10-22 16:04:58,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:58,825 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-22 16:04:58,826 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:04:58,827 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-22 16:04:58,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:58,836 INFO L225 Difference]: With dead ends: 30 [2018-10-22 16:04:58,836 INFO L226 Difference]: Without dead ends: 13 [2018-10-22 16:04:58,841 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 16:04:58,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-22 16:04:58,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-22 16:04:58,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-22 16:04:58,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-10-22 16:04:58,879 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-10-22 16:04:58,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:58,880 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-10-22 16:04:58,880 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:04:58,880 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-10-22 16:04:58,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-22 16:04:58,881 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:58,881 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:58,882 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:58,882 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:58,882 INFO L82 PathProgramCache]: Analyzing trace with hash 1144102878, now seen corresponding path program 1 times [2018-10-22 16:04:58,882 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:58,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:58,884 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:58,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:58,884 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:58,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:59,049 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 16:04:59,050 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:04:59,050 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 16:04:59,050 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:04:59,052 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:04:59,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:04:59,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:04:59,053 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-10-22 16:04:59,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:59,126 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2018-10-22 16:04:59,126 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:04:59,127 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-22 16:04:59,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:59,128 INFO L225 Difference]: With dead ends: 24 [2018-10-22 16:04:59,128 INFO L226 Difference]: Without dead ends: 16 [2018-10-22 16:04:59,129 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:04:59,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-22 16:04:59,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-22 16:04:59,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-22 16:04:59,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2018-10-22 16:04:59,134 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2018-10-22 16:04:59,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:59,134 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2018-10-22 16:04:59,134 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:04:59,134 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2018-10-22 16:04:59,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-22 16:04:59,135 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:59,135 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:59,136 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:59,136 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:59,136 INFO L82 PathProgramCache]: Analyzing trace with hash -2056921797, now seen corresponding path program 1 times [2018-10-22 16:04:59,136 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:59,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:59,141 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:59,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:59,141 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:59,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:59,252 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 16:04:59,253 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:59,253 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:59,254 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-22 16:04:59,257 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [26], [29], [31], [37], [38], [39], [41] [2018-10-22 16:04:59,305 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:04:59,306 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:04:59,413 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:04:59,793 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:04:59,796 INFO L272 AbstractInterpreter]: Visited 13 different actions 93 times. Merged at 4 different actions 42 times. Widened at 1 different actions 7 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-10-22 16:04:59,810 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:59,812 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:04:59,812 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:59,812 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 16:04:59,828 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:59,829 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:04:59,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:59,862 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:59,895 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 16:04:59,895 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:59,986 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 16:05:00,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:00,010 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 16:05:00,031 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:00,031 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:05:00,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:00,050 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:00,077 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 16:05:00,077 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:00,127 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 16:05:00,129 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:00,130 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-10-22 16:05:00,130 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:00,131 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-22 16:05:00,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-22 16:05:00,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:05:00,132 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 4 states. [2018-10-22 16:05:00,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:00,243 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2018-10-22 16:05:00,243 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-22 16:05:00,244 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-22 16:05:00,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:00,244 INFO L225 Difference]: With dead ends: 27 [2018-10-22 16:05:00,245 INFO L226 Difference]: Without dead ends: 19 [2018-10-22 16:05:00,245 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:05:00,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-22 16:05:00,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-22 16:05:00,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-22 16:05:00,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-10-22 16:05:00,250 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2018-10-22 16:05:00,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:00,251 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-10-22 16:05:00,251 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-22 16:05:00,251 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-10-22 16:05:00,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 16:05:00,254 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:00,254 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:00,255 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:00,255 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:00,256 INFO L82 PathProgramCache]: Analyzing trace with hash 1670825662, now seen corresponding path program 2 times [2018-10-22 16:05:00,256 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:00,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:00,257 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:00,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:00,257 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:00,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:00,533 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:00,534 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:00,534 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:00,535 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:00,535 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:00,535 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:00,535 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 16:05:00,555 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:05:00,555 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:00,585 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:05:00,586 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:00,587 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:00,612 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:00,612 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:00,702 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:00,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:00,731 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 16:05:00,746 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:05:00,747 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:00,769 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:05:00,770 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:00,774 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:00,814 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:00,814 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:00,830 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:00,837 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:00,838 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-10-22 16:05:00,838 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:00,838 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 16:05:00,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 16:05:00,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:05:00,839 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 5 states. [2018-10-22 16:05:00,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:00,896 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-22 16:05:00,897 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 16:05:00,897 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-10-22 16:05:00,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:00,900 INFO L225 Difference]: With dead ends: 30 [2018-10-22 16:05:00,900 INFO L226 Difference]: Without dead ends: 22 [2018-10-22 16:05:00,901 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:05:00,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-22 16:05:00,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-22 16:05:00,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-22 16:05:00,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2018-10-22 16:05:00,908 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2018-10-22 16:05:00,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:00,909 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2018-10-22 16:05:00,909 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 16:05:00,909 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2018-10-22 16:05:00,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-22 16:05:00,911 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:00,911 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:00,911 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:00,912 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:00,912 INFO L82 PathProgramCache]: Analyzing trace with hash 26004059, now seen corresponding path program 3 times [2018-10-22 16:05:00,913 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:00,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:00,916 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:00,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:00,916 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:00,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:01,145 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:01,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:01,145 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:01,146 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:01,146 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:01,146 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:01,146 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 16:05:01,159 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:05:01,159 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:05:01,169 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-22 16:05:01,169 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:01,171 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:01,188 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-22 16:05:01,189 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:01,209 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-22 16:05:01,230 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-22 16:05:01,230 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [6] total 8 [2018-10-22 16:05:01,230 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:05:01,231 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:05:01,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:05:01,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:05:01,232 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 3 states. [2018-10-22 16:05:01,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:01,279 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-10-22 16:05:01,280 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:05:01,280 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2018-10-22 16:05:01,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:01,282 INFO L225 Difference]: With dead ends: 30 [2018-10-22 16:05:01,282 INFO L226 Difference]: Without dead ends: 25 [2018-10-22 16:05:01,283 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:05:01,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-22 16:05:01,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2018-10-22 16:05:01,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-22 16:05:01,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-10-22 16:05:01,288 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 20 [2018-10-22 16:05:01,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:01,289 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-10-22 16:05:01,289 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:05:01,289 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-10-22 16:05:01,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-22 16:05:01,290 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:01,290 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:01,290 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:01,290 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:01,291 INFO L82 PathProgramCache]: Analyzing trace with hash -2092450784, now seen corresponding path program 1 times [2018-10-22 16:05:01,291 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:01,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:01,292 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:01,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:01,292 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:01,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:01,468 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:01,469 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:01,469 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:01,469 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 24 with the following transitions: [2018-10-22 16:05:01,469 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-22 16:05:01,471 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:05:01,471 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:05:01,476 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:05:01,731 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:05:01,731 INFO L272 AbstractInterpreter]: Visited 14 different actions 114 times. Merged at 5 different actions 46 times. Widened at 2 different actions 7 times. Found 12 fixpoints after 2 different actions. Largest state had 2 variables. [2018-10-22 16:05:01,776 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:01,776 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:05:01,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:01,777 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:01,791 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:01,791 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:05:01,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:01,818 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:01,996 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:01,996 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:02,811 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:02,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:02,842 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 8 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 8 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:02,871 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:02,872 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:05:02,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:02,899 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:02,950 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:02,951 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:03,109 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:03,111 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:03,111 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 7, 6, 6] total 15 [2018-10-22 16:05:03,111 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:03,112 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 16:05:03,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 16:05:03,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=133, Unknown=0, NotChecked=0, Total=210 [2018-10-22 16:05:03,113 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 7 states. [2018-10-22 16:05:03,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:03,248 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2018-10-22 16:05:03,249 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 16:05:03,249 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-10-22 16:05:03,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:03,250 INFO L225 Difference]: With dead ends: 37 [2018-10-22 16:05:03,250 INFO L226 Difference]: Without dead ends: 27 [2018-10-22 16:05:03,251 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 81 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=77, Invalid=133, Unknown=0, NotChecked=0, Total=210 [2018-10-22 16:05:03,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-22 16:05:03,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-10-22 16:05:03,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-22 16:05:03,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-10-22 16:05:03,255 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 23 [2018-10-22 16:05:03,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:03,256 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-10-22 16:05:03,256 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 16:05:03,256 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-10-22 16:05:03,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-22 16:05:03,257 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:03,257 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:03,257 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:03,257 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:03,258 INFO L82 PathProgramCache]: Analyzing trace with hash 1956763133, now seen corresponding path program 2 times [2018-10-22 16:05:03,258 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:03,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:03,259 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:03,259 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:03,259 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:03,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:03,507 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:03,507 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:03,508 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:03,508 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:03,508 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:03,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:03,508 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:03,518 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:05:03,518 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:03,531 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:05:03,532 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:03,534 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:03,563 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:03,564 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:03,897 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:03,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:03,917 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 10 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 10 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:03,933 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:05:03,933 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:03,958 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:05:03,959 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:03,962 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:03,992 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:03,992 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:04,007 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:04,009 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:04,009 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-10-22 16:05:04,009 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:04,009 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 16:05:04,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 16:05:04,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:05:04,011 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2018-10-22 16:05:04,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:04,159 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2018-10-22 16:05:04,161 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 16:05:04,162 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-10-22 16:05:04,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:04,163 INFO L225 Difference]: With dead ends: 40 [2018-10-22 16:05:04,163 INFO L226 Difference]: Without dead ends: 30 [2018-10-22 16:05:04,163 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:05:04,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-22 16:05:04,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-22 16:05:04,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-22 16:05:04,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-10-22 16:05:04,168 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 26 [2018-10-22 16:05:04,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:04,169 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-10-22 16:05:04,169 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 16:05:04,169 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-10-22 16:05:04,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-22 16:05:04,170 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:04,170 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:04,170 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:04,170 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:04,170 INFO L82 PathProgramCache]: Analyzing trace with hash -657878272, now seen corresponding path program 3 times [2018-10-22 16:05:04,170 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:04,171 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:04,171 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:04,171 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:04,171 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:04,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:04,451 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:04,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:04,451 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:04,451 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:04,452 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:04,452 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:04,452 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:04,463 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:05:04,464 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:05:04,476 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-22 16:05:04,476 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:04,478 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:04,530 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-22 16:05:04,530 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:04,572 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-22 16:05:04,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:04,593 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 12 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 12 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:04,609 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:05:04,609 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:05:04,639 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-22 16:05:04,639 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:04,642 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:04,649 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-22 16:05:04,649 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:04,660 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-22 16:05:04,661 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:04,662 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 4, 4, 4, 4] total 13 [2018-10-22 16:05:04,662 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:04,662 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 16:05:04,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 16:05:04,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2018-10-22 16:05:04,663 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 11 states. [2018-10-22 16:05:05,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:05,094 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2018-10-22 16:05:05,094 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 16:05:05,095 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2018-10-22 16:05:05,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:05,095 INFO L225 Difference]: With dead ends: 50 [2018-10-22 16:05:05,096 INFO L226 Difference]: Without dead ends: 40 [2018-10-22 16:05:05,096 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 112 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:05:05,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-22 16:05:05,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 36. [2018-10-22 16:05:05,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-22 16:05:05,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2018-10-22 16:05:05,102 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 29 [2018-10-22 16:05:05,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:05,102 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2018-10-22 16:05:05,102 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 16:05:05,102 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2018-10-22 16:05:05,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-22 16:05:05,103 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:05,104 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:05,104 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:05,104 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:05,104 INFO L82 PathProgramCache]: Analyzing trace with hash -249977826, now seen corresponding path program 4 times [2018-10-22 16:05:05,104 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:05,105 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:05,105 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:05,105 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:05,106 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:05,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:05,306 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:05,306 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:05,307 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:05,307 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:05,307 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:05,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:05,307 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:05,315 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:05:05,315 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:05:05,335 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:05:05,336 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:05,340 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:05,445 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 35 proven. 63 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:05:05,446 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:05,842 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 35 proven. 63 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:05:05,864 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:05,864 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 14 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 14 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:05,879 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:05:05,880 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:05:05,905 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:05:05,905 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:05,908 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:05,944 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 35 proven. 63 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:05:05,944 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:06,404 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 35 proven. 63 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:05:06,406 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:06,406 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 10, 9, 9] total 25 [2018-10-22 16:05:06,406 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:06,406 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 16:05:06,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 16:05:06,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=399, Unknown=0, NotChecked=0, Total=600 [2018-10-22 16:05:06,407 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 11 states. [2018-10-22 16:05:06,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:06,543 INFO L93 Difference]: Finished difference Result 52 states and 57 transitions. [2018-10-22 16:05:06,544 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 16:05:06,544 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-10-22 16:05:06,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:06,545 INFO L225 Difference]: With dead ends: 52 [2018-10-22 16:05:06,545 INFO L226 Difference]: Without dead ends: 39 [2018-10-22 16:05:06,547 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 123 SyntacticMatches, 4 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=201, Invalid=399, Unknown=0, NotChecked=0, Total=600 [2018-10-22 16:05:06,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-22 16:05:06,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-10-22 16:05:06,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-22 16:05:06,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2018-10-22 16:05:06,552 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 35 [2018-10-22 16:05:06,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:06,552 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2018-10-22 16:05:06,552 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 16:05:06,553 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2018-10-22 16:05:06,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-22 16:05:06,554 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:06,554 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:06,554 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:06,554 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:06,554 INFO L82 PathProgramCache]: Analyzing trace with hash 1580391035, now seen corresponding path program 5 times [2018-10-22 16:05:06,555 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:06,555 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:06,555 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:06,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:06,556 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:06,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:06,738 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:06,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:06,739 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:06,739 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:06,739 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:06,739 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:06,739 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:06,748 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:05:06,748 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:39,135 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2018-10-22 16:05:39,135 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:39,379 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:39,667 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 18 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:39,668 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:40,270 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 18 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:40,273 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:40,273 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 16 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 16 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:40,289 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:05:40,289 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:40,395 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2018-10-22 16:05:40,396 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:40,399 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:40,418 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 40 proven. 84 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:05:40,418 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:40,989 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 40 proven. 84 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (16)] Exception during sending of exit command (exit): Broken pipe [2018-10-22 16:05:40,994 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:40,994 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 12, 10, 10] total 29 [2018-10-22 16:05:40,994 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:40,995 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 16:05:40,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 16:05:40,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=558, Unknown=0, NotChecked=0, Total=812 [2018-10-22 16:05:40,996 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 12 states. [2018-10-22 16:05:41,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:41,339 INFO L93 Difference]: Finished difference Result 55 states and 60 transitions. [2018-10-22 16:05:41,339 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:05:41,339 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-10-22 16:05:41,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:41,340 INFO L225 Difference]: With dead ends: 55 [2018-10-22 16:05:41,340 INFO L226 Difference]: Without dead ends: 42 [2018-10-22 16:05:41,341 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 132 SyntacticMatches, 4 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=254, Invalid=558, Unknown=0, NotChecked=0, Total=812 [2018-10-22 16:05:41,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-22 16:05:41,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-22 16:05:41,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-22 16:05:41,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2018-10-22 16:05:41,347 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 38 [2018-10-22 16:05:41,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:41,347 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2018-10-22 16:05:41,347 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 16:05:41,347 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2018-10-22 16:05:41,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-22 16:05:41,348 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:41,349 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:41,349 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:41,349 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:41,349 INFO L82 PathProgramCache]: Analyzing trace with hash 1194339070, now seen corresponding path program 6 times [2018-10-22 16:05:41,349 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:41,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:41,350 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:41,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:41,350 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:41,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:41,642 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:41,643 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:41,643 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:41,643 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:41,643 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:41,643 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:41,643 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:41,653 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:05:41,653 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:05:41,701 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2018-10-22 16:05:41,702 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:41,703 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:41,782 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 64 proven. 7 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:05:41,783 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:41,850 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 64 proven. 7 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:05:41,870 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:41,870 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 18 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 18 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:41,885 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:05:41,886 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:05:42,007 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2018-10-22 16:05:42,007 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:42,010 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:42,015 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 64 proven. 7 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:05:42,016 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:42,027 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 64 proven. 7 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:05:42,028 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:42,028 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 5, 5, 5, 5] total 19 [2018-10-22 16:05:42,029 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:42,029 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:05:42,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:05:42,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=241, Unknown=0, NotChecked=0, Total=342 [2018-10-22 16:05:42,030 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 16 states. [2018-10-22 16:05:42,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:42,776 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2018-10-22 16:05:42,777 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:05:42,777 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 41 [2018-10-22 16:05:42,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:42,779 INFO L225 Difference]: With dead ends: 65 [2018-10-22 16:05:42,779 INFO L226 Difference]: Without dead ends: 52 [2018-10-22 16:05:42,780 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 159 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=129, Invalid=291, Unknown=0, NotChecked=0, Total=420 [2018-10-22 16:05:42,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-22 16:05:42,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 48. [2018-10-22 16:05:42,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-22 16:05:42,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2018-10-22 16:05:42,786 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 41 [2018-10-22 16:05:42,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:42,787 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2018-10-22 16:05:42,787 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:05:42,787 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2018-10-22 16:05:42,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-22 16:05:42,788 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:42,788 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:42,788 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:42,788 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:42,788 INFO L82 PathProgramCache]: Analyzing trace with hash -565963040, now seen corresponding path program 7 times [2018-10-22 16:05:42,788 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:42,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:42,789 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:42,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:42,790 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:42,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:43,366 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:43,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:43,367 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:43,367 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:43,367 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:43,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:43,367 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:43,376 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:43,376 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:05:43,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:43,391 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:43,429 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 80 proven. 135 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-22 16:05:43,429 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:44,201 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 80 proven. 135 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-22 16:05:44,221 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:44,221 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 20 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 20 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:44,236 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:44,236 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:05:44,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:44,268 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:44,301 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 80 proven. 135 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-22 16:05:44,301 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:44,938 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 80 proven. 135 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-22 16:05:44,939 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:44,940 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 13, 12, 12] total 35 [2018-10-22 16:05:44,940 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:44,940 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 16:05:44,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 16:05:44,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=808, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 16:05:44,942 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 15 states. [2018-10-22 16:05:45,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:45,250 INFO L93 Difference]: Finished difference Result 67 states and 74 transitions. [2018-10-22 16:05:45,250 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 16:05:45,250 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-10-22 16:05:45,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:45,252 INFO L225 Difference]: With dead ends: 67 [2018-10-22 16:05:45,252 INFO L226 Difference]: Without dead ends: 51 [2018-10-22 16:05:45,253 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 165 SyntacticMatches, 4 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=382, Invalid=808, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 16:05:45,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-22 16:05:45,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-10-22 16:05:45,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-22 16:05:45,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2018-10-22 16:05:45,259 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 47 [2018-10-22 16:05:45,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:45,260 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2018-10-22 16:05:45,260 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 16:05:45,260 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2018-10-22 16:05:45,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-22 16:05:45,261 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:45,261 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:45,261 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:45,261 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:45,261 INFO L82 PathProgramCache]: Analyzing trace with hash -1227511363, now seen corresponding path program 8 times [2018-10-22 16:05:45,262 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:45,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:45,262 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:45,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:45,263 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:45,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:45,565 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:45,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:45,565 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:45,565 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:45,566 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:45,566 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:45,566 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:45,581 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:05:45,581 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:45,597 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:05:45,597 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:45,599 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:45,629 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:45,629 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:46,349 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:46,370 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:46,371 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 22 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 22 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:46,385 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:05:46,385 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:46,421 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:05:46,422 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:46,425 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:46,454 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:46,455 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:46,519 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:46,521 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:46,521 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-10-22 16:05:46,521 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:46,522 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:05:46,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:05:46,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:05:46,523 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2018-10-22 16:05:46,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:46,875 INFO L93 Difference]: Finished difference Result 70 states and 77 transitions. [2018-10-22 16:05:46,877 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 16:05:46,877 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-10-22 16:05:46,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:46,878 INFO L225 Difference]: With dead ends: 70 [2018-10-22 16:05:46,878 INFO L226 Difference]: Without dead ends: 54 [2018-10-22 16:05:46,879 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 184 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:05:46,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-22 16:05:46,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-10-22 16:05:46,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-22 16:05:46,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 57 transitions. [2018-10-22 16:05:46,889 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 57 transitions. Word has length 50 [2018-10-22 16:05:46,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:46,890 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 57 transitions. [2018-10-22 16:05:46,890 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:05:46,890 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 57 transitions. [2018-10-22 16:05:46,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-22 16:05:46,891 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:46,891 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 11, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:46,891 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:46,892 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:46,892 INFO L82 PathProgramCache]: Analyzing trace with hash 191319488, now seen corresponding path program 9 times [2018-10-22 16:05:46,892 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:46,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:46,893 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:46,893 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:46,893 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:46,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:47,183 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:47,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:47,184 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:47,184 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:47,184 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:47,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:47,184 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:47,192 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:05:47,192 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:05:47,208 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-22 16:05:47,208 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:47,209 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:47,365 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 15 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-22 16:05:47,365 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:47,488 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 15 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-22 16:05:47,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:47,508 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 24 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 24 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:47,523 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:05:47,523 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:05:47,593 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-22 16:05:47,593 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:47,596 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:47,605 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 15 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-22 16:05:47,605 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:47,659 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 15 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-22 16:05:47,661 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:47,661 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 6, 6, 6, 6] total 25 [2018-10-22 16:05:47,661 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:47,662 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-22 16:05:47,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-22 16:05:47,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=433, Unknown=0, NotChecked=0, Total=600 [2018-10-22 16:05:47,662 INFO L87 Difference]: Start difference. First operand 54 states and 57 transitions. Second operand 21 states. [2018-10-22 16:05:52,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:52,894 INFO L93 Difference]: Finished difference Result 80 states and 91 transitions. [2018-10-22 16:05:52,895 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 16:05:52,895 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 53 [2018-10-22 16:05:52,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:52,896 INFO L225 Difference]: With dead ends: 80 [2018-10-22 16:05:52,896 INFO L226 Difference]: Without dead ends: 64 [2018-10-22 16:05:52,896 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 206 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=221, Invalid=535, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:05:52,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-22 16:05:52,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 60. [2018-10-22 16:05:52,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-22 16:05:52,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2018-10-22 16:05:52,904 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 53 [2018-10-22 16:05:52,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:52,904 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2018-10-22 16:05:52,904 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-22 16:05:52,905 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2018-10-22 16:05:52,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-22 16:05:52,906 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:52,906 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:52,906 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:52,906 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:52,906 INFO L82 PathProgramCache]: Analyzing trace with hash 794925150, now seen corresponding path program 10 times [2018-10-22 16:05:52,907 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:52,907 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:52,908 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:52,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:52,908 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:52,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:53,349 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:53,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:53,349 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:53,350 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:53,350 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:53,350 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:53,350 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:53,358 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:05:53,358 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:05:53,387 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:05:53,387 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:53,389 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:53,436 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 143 proven. 234 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:05:53,437 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:54,676 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 143 proven. 234 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:05:54,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:54,697 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 26 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 26 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:54,714 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:05:54,714 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:05:54,752 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:05:54,752 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:54,756 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:54,775 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 143 proven. 234 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:05:54,775 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:55,768 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 143 proven. 234 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:05:55,769 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:55,770 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 15, 16, 15, 15] total 45 [2018-10-22 16:05:55,770 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:55,770 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-22 16:05:55,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-22 16:05:55,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=620, Invalid=1360, Unknown=0, NotChecked=0, Total=1980 [2018-10-22 16:05:55,771 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand 19 states. [2018-10-22 16:05:57,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:57,190 INFO L93 Difference]: Finished difference Result 82 states and 91 transitions. [2018-10-22 16:05:57,191 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:05:57,191 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-10-22 16:05:57,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:57,192 INFO L225 Difference]: With dead ends: 82 [2018-10-22 16:05:57,192 INFO L226 Difference]: Without dead ends: 63 [2018-10-22 16:05:57,194 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 207 SyntacticMatches, 4 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=620, Invalid=1360, Unknown=0, NotChecked=0, Total=1980 [2018-10-22 16:05:57,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-22 16:05:57,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-10-22 16:05:57,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-22 16:05:57,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 67 transitions. [2018-10-22 16:05:57,201 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 67 transitions. Word has length 59 [2018-10-22 16:05:57,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:57,202 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 67 transitions. [2018-10-22 16:05:57,202 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-22 16:05:57,202 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 67 transitions. [2018-10-22 16:05:57,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-22 16:05:57,203 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:57,203 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 13, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:57,203 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:57,204 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:57,204 INFO L82 PathProgramCache]: Analyzing trace with hash 1464125371, now seen corresponding path program 11 times [2018-10-22 16:05:57,204 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:57,205 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:57,205 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:57,205 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:57,205 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:57,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:57,567 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:57,567 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:57,567 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:57,567 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:57,568 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:57,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:57,568 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:57,576 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:05:57,576 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:31,745 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 16:08:31,745 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:31,803 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:31,841 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 154 proven. 273 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:08:31,841 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:33,183 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 154 proven. 273 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:08:33,204 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:33,204 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 28 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 28 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:33,220 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:33,220 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:33,579 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 16:08:33,579 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:33,583 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:33,595 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 154 proven. 273 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:08:33,596 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:34,743 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 154 proven. 273 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:08:34,746 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:34,746 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 16, 17, 16, 16] total 48 [2018-10-22 16:08:34,746 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:34,747 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-22 16:08:34,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-22 16:08:34,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=702, Invalid=1554, Unknown=0, NotChecked=0, Total=2256 [2018-10-22 16:08:34,748 INFO L87 Difference]: Start difference. First operand 63 states and 67 transitions. Second operand 20 states. [2018-10-22 16:08:36,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:36,171 INFO L93 Difference]: Finished difference Result 85 states and 94 transitions. [2018-10-22 16:08:36,172 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 16:08:36,172 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-10-22 16:08:36,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:36,173 INFO L225 Difference]: With dead ends: 85 [2018-10-22 16:08:36,173 INFO L226 Difference]: Without dead ends: 66 [2018-10-22 16:08:36,174 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 217 SyntacticMatches, 4 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=702, Invalid=1554, Unknown=0, NotChecked=0, Total=2256 [2018-10-22 16:08:36,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-22 16:08:36,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-10-22 16:08:36,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-22 16:08:36,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2018-10-22 16:08:36,188 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 62 [2018-10-22 16:08:36,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:36,188 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2018-10-22 16:08:36,188 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-22 16:08:36,188 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2018-10-22 16:08:36,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-22 16:08:36,189 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:36,189 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 14, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:36,190 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:36,190 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:36,190 INFO L82 PathProgramCache]: Analyzing trace with hash 369721150, now seen corresponding path program 12 times [2018-10-22 16:08:36,190 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:36,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:36,192 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:36,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:36,192 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:36,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:36,555 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:36,555 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:36,555 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:36,555 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:36,555 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:36,555 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:36,556 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:36,563 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:36,563 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:39,081 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2018-10-22 16:08:39,081 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:39,123 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:39,326 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 26 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-22 16:08:39,326 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:39,700 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 26 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-22 16:08:39,720 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:39,720 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 30 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 30 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:39,740 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:39,740 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:40,053 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2018-10-22 16:08:40,053 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:40,057 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:40,080 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 26 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-22 16:08:40,081 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:40,146 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 26 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-22 16:08:40,148 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:40,149 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 7, 7, 7, 7] total 31 [2018-10-22 16:08:40,149 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:40,149 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-22 16:08:40,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-22 16:08:40,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=681, Unknown=0, NotChecked=0, Total=930 [2018-10-22 16:08:40,150 INFO L87 Difference]: Start difference. First operand 66 states and 70 transitions. Second operand 26 states. [2018-10-22 16:08:42,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:42,198 INFO L93 Difference]: Finished difference Result 95 states and 108 transitions. [2018-10-22 16:08:42,199 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-22 16:08:42,199 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 65 [2018-10-22 16:08:42,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:42,200 INFO L225 Difference]: With dead ends: 95 [2018-10-22 16:08:42,200 INFO L226 Difference]: Without dead ends: 76 [2018-10-22 16:08:42,201 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 253 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=337, Invalid=853, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 16:08:42,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-10-22 16:08:42,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 72. [2018-10-22 16:08:42,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-22 16:08:42,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2018-10-22 16:08:42,208 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 65 [2018-10-22 16:08:42,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:42,208 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2018-10-22 16:08:42,208 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-22 16:08:42,209 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2018-10-22 16:08:42,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-22 16:08:42,210 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:42,210 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 15, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:42,210 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:42,210 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:42,210 INFO L82 PathProgramCache]: Analyzing trace with hash -512392800, now seen corresponding path program 13 times [2018-10-22 16:08:42,210 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:42,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:42,211 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:42,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:42,211 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:42,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:42,781 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:42,781 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:42,781 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:42,782 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:42,782 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:42,782 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:42,782 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:42,792 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:42,792 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:42,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:42,817 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:42,882 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 224 proven. 360 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-22 16:08:42,882 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:44,598 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 224 proven. 360 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-22 16:08:44,618 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:44,618 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 32 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 32 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:44,633 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:44,633 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:44,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:44,680 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:44,693 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 224 proven. 360 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-22 16:08:44,693 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:46,569 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 224 proven. 360 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-22 16:08:46,570 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:46,570 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 18, 19, 18, 18] total 55 [2018-10-22 16:08:46,571 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:46,571 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-22 16:08:46,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-22 16:08:46,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=915, Invalid=2055, Unknown=0, NotChecked=0, Total=2970 [2018-10-22 16:08:46,574 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand 23 states. [2018-10-22 16:08:47,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:47,241 INFO L93 Difference]: Finished difference Result 97 states and 108 transitions. [2018-10-22 16:08:47,241 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 16:08:47,242 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 71 [2018-10-22 16:08:47,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:47,243 INFO L225 Difference]: With dead ends: 97 [2018-10-22 16:08:47,243 INFO L226 Difference]: Without dead ends: 75 [2018-10-22 16:08:47,244 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 249 SyntacticMatches, 4 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=915, Invalid=2055, Unknown=0, NotChecked=0, Total=2970 [2018-10-22 16:08:47,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-22 16:08:47,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-10-22 16:08:47,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-22 16:08:47,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 80 transitions. [2018-10-22 16:08:47,252 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 80 transitions. Word has length 71 [2018-10-22 16:08:47,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:47,253 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 80 transitions. [2018-10-22 16:08:47,253 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-22 16:08:47,253 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 80 transitions. [2018-10-22 16:08:47,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-22 16:08:47,254 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:47,254 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:47,254 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:47,254 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:47,254 INFO L82 PathProgramCache]: Analyzing trace with hash 10718589, now seen corresponding path program 14 times [2018-10-22 16:08:47,254 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:47,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:47,255 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:47,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:47,255 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:47,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:47,976 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:47,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:47,976 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:47,976 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:47,976 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:47,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:47,976 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:47,985 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:47,985 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:48,005 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:48,005 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:48,007 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:48,028 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:48,028 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:49,317 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:49,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:49,337 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 34 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 34 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:49,351 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:49,351 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:49,399 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:49,399 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:49,403 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:49,441 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:49,441 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:49,479 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:49,481 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:49,481 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24, 24, 24] total 46 [2018-10-22 16:08:49,481 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:49,481 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-22 16:08:49,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-22 16:08:49,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-10-22 16:08:49,482 INFO L87 Difference]: Start difference. First operand 75 states and 80 transitions. Second operand 24 states. [2018-10-22 16:08:50,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:50,028 INFO L93 Difference]: Finished difference Result 100 states and 111 transitions. [2018-10-22 16:08:50,029 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 16:08:50,029 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 74 [2018-10-22 16:08:50,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:50,030 INFO L225 Difference]: With dead ends: 100 [2018-10-22 16:08:50,030 INFO L226 Difference]: Without dead ends: 78 [2018-10-22 16:08:50,032 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 272 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-10-22 16:08:50,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-22 16:08:50,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2018-10-22 16:08:50,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-22 16:08:50,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 83 transitions. [2018-10-22 16:08:50,046 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 83 transitions. Word has length 74 [2018-10-22 16:08:50,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:50,046 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 83 transitions. [2018-10-22 16:08:50,046 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-22 16:08:50,046 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 83 transitions. [2018-10-22 16:08:50,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-22 16:08:50,047 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:50,047 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 17, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:50,048 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:50,051 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:50,051 INFO L82 PathProgramCache]: Analyzing trace with hash 1880758400, now seen corresponding path program 15 times [2018-10-22 16:08:50,051 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:50,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:50,052 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:50,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:50,052 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:50,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:50,976 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:50,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:50,977 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:50,977 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:50,977 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:50,977 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:50,977 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:50,984 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:50,984 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:51,013 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-22 16:08:51,013 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:51,015 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:51,277 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 289 proven. 40 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2018-10-22 16:08:51,277 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:51,568 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 289 proven. 40 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2018-10-22 16:08:51,597 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:51,598 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 36 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 36 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:51,624 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:51,624 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:51,753 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-22 16:08:51,753 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:51,756 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:51,766 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 289 proven. 40 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2018-10-22 16:08:51,767 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:51,777 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 289 proven. 40 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2018-10-22 16:08:51,779 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:51,779 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 8, 8, 8, 8] total 37 [2018-10-22 16:08:51,779 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:51,779 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-22 16:08:51,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-22 16:08:51,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=347, Invalid=985, Unknown=0, NotChecked=0, Total=1332 [2018-10-22 16:08:51,781 INFO L87 Difference]: Start difference. First operand 78 states and 83 transitions. Second operand 31 states. [2018-10-22 16:08:56,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:56,761 INFO L93 Difference]: Finished difference Result 110 states and 125 transitions. [2018-10-22 16:08:56,761 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-22 16:08:56,761 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 77 [2018-10-22 16:08:56,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:56,763 INFO L225 Difference]: With dead ends: 110 [2018-10-22 16:08:56,763 INFO L226 Difference]: Without dead ends: 88 [2018-10-22 16:08:56,764 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 300 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=477, Invalid=1245, Unknown=0, NotChecked=0, Total=1722 [2018-10-22 16:08:56,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-10-22 16:08:56,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 84. [2018-10-22 16:08:56,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-22 16:08:56,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 90 transitions. [2018-10-22 16:08:56,771 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 90 transitions. Word has length 77 [2018-10-22 16:08:56,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:56,772 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 90 transitions. [2018-10-22 16:08:56,772 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-22 16:08:56,772 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 90 transitions. [2018-10-22 16:08:56,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-22 16:08:56,773 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:56,773 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 18, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:56,773 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:56,773 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:56,773 INFO L82 PathProgramCache]: Analyzing trace with hash -1326089058, now seen corresponding path program 16 times [2018-10-22 16:08:56,774 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:56,774 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:56,774 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:56,774 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:56,774 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:56,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:57,718 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 48 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:57,719 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:57,719 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:57,719 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:57,719 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:57,719 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:57,719 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:57,727 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:57,728 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:57,752 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:57,752 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:57,753 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:57,798 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 323 proven. 513 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:08:57,798 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:59,800 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 323 proven. 513 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:08:59,820 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:59,820 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 38 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 38 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:59,835 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:59,835 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:59,887 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:59,887 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:59,891 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:59,926 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 323 proven. 513 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:08:59,926 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:01,829 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 323 proven. 513 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:09:01,830 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:01,830 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 21, 22, 21, 21] total 65 [2018-10-22 16:09:01,830 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:01,831 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-22 16:09:01,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-22 16:09:01,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1291, Invalid=2869, Unknown=0, NotChecked=0, Total=4160 [2018-10-22 16:09:01,833 INFO L87 Difference]: Start difference. First operand 84 states and 90 transitions. Second operand 27 states. [2018-10-22 16:09:02,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:02,496 INFO L93 Difference]: Finished difference Result 115 states and 129 transitions. [2018-10-22 16:09:02,496 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 16:09:02,496 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 83 [2018-10-22 16:09:02,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:02,498 INFO L225 Difference]: With dead ends: 115 [2018-10-22 16:09:02,498 INFO L226 Difference]: Without dead ends: 90 [2018-10-22 16:09:02,500 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 291 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=1291, Invalid=2869, Unknown=0, NotChecked=0, Total=4160 [2018-10-22 16:09:02,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-22 16:09:02,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2018-10-22 16:09:02,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-22 16:09:02,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 96 transitions. [2018-10-22 16:09:02,506 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 96 transitions. Word has length 83 [2018-10-22 16:09:02,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:02,507 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 96 transitions. [2018-10-22 16:09:02,507 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-22 16:09:02,507 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 96 transitions. [2018-10-22 16:09:02,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-22 16:09:02,508 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:02,508 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 20, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:02,508 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:02,508 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:02,508 INFO L82 PathProgramCache]: Analyzing trace with hash -502348930, now seen corresponding path program 17 times [2018-10-22 16:09:02,509 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:02,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:02,509 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:02,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:02,509 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:02,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:03,465 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 52 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:03,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:03,465 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:03,465 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:03,466 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:03,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:03,466 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:03,475 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:03,475 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown