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-crafted/simple_array_index_value_true-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-0fd1304 [2018-10-23 16:08:48,449 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-23 16:08:48,451 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-23 16:08:48,469 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-23 16:08:48,470 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-23 16:08:48,471 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-23 16:08:48,473 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-23 16:08:48,475 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-23 16:08:48,477 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-23 16:08:48,478 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-23 16:08:48,487 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-23 16:08:48,488 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-23 16:08:48,489 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-23 16:08:48,490 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-23 16:08:48,491 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-23 16:08:48,491 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-23 16:08:48,492 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-23 16:08:48,494 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-23 16:08:48,496 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-23 16:08:48,497 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-23 16:08:48,498 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-23 16:08:48,499 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-23 16:08:48,501 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-23 16:08:48,502 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-23 16:08:48,502 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-23 16:08:48,503 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-23 16:08:48,504 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-23 16:08:48,504 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-23 16:08:48,505 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-23 16:08:48,506 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-23 16:08:48,506 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-23 16:08:48,507 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-23 16:08:48,510 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 [2018-10-23 16:08:48,525 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-23 16:08:48,525 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-23 16:08:48,526 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-23 16:08:48,526 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-23 16:08:48,527 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-23 16:08:48,527 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-23 16:08:48,527 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-23 16:08:48,527 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-23 16:08:48,527 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-23 16:08:48,528 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-23 16:08:48,528 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-23 16:08:48,528 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-23 16:08:48,528 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-23 16:08:48,529 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-23 16:08:48,529 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-23 16:08:48,529 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-23 16:08:48,529 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-23 16:08:48,529 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-23 16:08:48,530 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-23 16:08:48,530 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-23 16:08:48,530 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-23 16:08:48,530 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-23 16:08:48,530 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-23 16:08:48,531 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-23 16:08:48,531 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-23 16:08:48,531 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-23 16:08:48,531 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-23 16:08:48,531 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-23 16:08:48,531 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-23 16:08:48,532 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-23 16:08:48,532 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-23 16:08:48,532 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-23 16:08:48,532 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-23 16:08:48,532 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-23 16:08:48,587 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-23 16:08:48,606 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-23 16:08:48,609 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-23 16:08:48,611 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-23 16:08:48,611 INFO L276 PluginConnector]: CDTParser initialized [2018-10-23 16:08:48,612 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call1_true-termination.i [2018-10-23 16:08:48,669 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/764530774/a1bdfde3b06d45a5b9b4e9bde063ca3f/FLAG73f2290fb [2018-10-23 16:08:49,132 INFO L298 CDTParser]: Found 1 translation units. [2018-10-23 16:08:49,134 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call1_true-termination.i [2018-10-23 16:08:49,142 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/764530774/a1bdfde3b06d45a5b9b4e9bde063ca3f/FLAG73f2290fb [2018-10-23 16:08:49,164 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/764530774/a1bdfde3b06d45a5b9b4e9bde063ca3f [2018-10-23 16:08:49,176 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-23 16:08:49,178 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-23 16:08:49,182 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-23 16:08:49,182 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-23 16:08:49,186 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-23 16:08:49,187 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 04:08:49" (1/1) ... [2018-10-23 16:08:49,190 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@12b8561a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:08:49, skipping insertion in model container [2018-10-23 16:08:49,190 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 04:08:49" (1/1) ... [2018-10-23 16:08:49,201 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-23 16:08:49,226 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-23 16:08:49,395 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-23 16:08:49,399 INFO L189 MainTranslator]: Completed pre-run [2018-10-23 16:08:49,421 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-23 16:08:49,441 INFO L193 MainTranslator]: Completed translation [2018-10-23 16:08:49,442 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:08:49 WrapperNode [2018-10-23 16:08:49,442 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-23 16:08:49,443 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-23 16:08:49,443 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-23 16:08:49,443 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-23 16:08:49,452 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:08:49" (1/1) ... [2018-10-23 16:08:49,462 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:08:49" (1/1) ... [2018-10-23 16:08:49,485 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-23 16:08:49,485 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-23 16:08:49,485 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-23 16:08:49,486 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-23 16:08:49,496 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:08:49" (1/1) ... [2018-10-23 16:08:49,496 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:08:49" (1/1) ... [2018-10-23 16:08:49,498 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:08:49" (1/1) ... [2018-10-23 16:08:49,498 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:08:49" (1/1) ... [2018-10-23 16:08:49,503 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:08:49" (1/1) ... [2018-10-23 16:08:49,509 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:08:49" (1/1) ... [2018-10-23 16:08:49,510 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:08:49" (1/1) ... [2018-10-23 16:08:49,515 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-23 16:08:49,516 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-23 16:08:49,516 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-23 16:08:49,516 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-23 16:08:49,517 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:08:49" (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 [2018-10-23 16:08:49,667 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-23 16:08:49,668 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-23 16:08:49,668 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-23 16:08:49,668 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-23 16:08:49,668 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-23 16:08:49,668 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-23 16:08:49,669 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-23 16:08:49,669 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-23 16:08:50,194 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-23 16:08:50,195 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 04:08:50 BoogieIcfgContainer [2018-10-23 16:08:50,196 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-23 16:08:50,197 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-23 16:08:50,197 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-23 16:08:50,200 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-23 16:08:50,200 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 04:08:49" (1/3) ... [2018-10-23 16:08:50,201 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75eb3ca3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 04:08:50, skipping insertion in model container [2018-10-23 16:08:50,201 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 04:08:49" (2/3) ... [2018-10-23 16:08:50,202 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75eb3ca3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 04:08:50, skipping insertion in model container [2018-10-23 16:08:50,202 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 04:08:50" (3/3) ... [2018-10-23 16:08:50,204 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_array_index_value_true-unreach-call1_true-termination.i [2018-10-23 16:08:50,214 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-23 16:08:50,222 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-23 16:08:50,239 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-23 16:08:50,274 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-23 16:08:50,274 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-23 16:08:50,275 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-23 16:08:50,275 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-23 16:08:50,275 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-23 16:08:50,275 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-23 16:08:50,275 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-23 16:08:50,276 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-23 16:08:50,300 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2018-10-23 16:08:50,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-23 16:08:50,308 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:08:50,310 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:08:50,312 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:08:50,318 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:08:50,318 INFO L82 PathProgramCache]: Analyzing trace with hash 1504457121, now seen corresponding path program 1 times [2018-10-23 16:08:50,321 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:08:50,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:08:50,373 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:08:50,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:08:50,373 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:08:50,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:08:50,444 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:08:50,447 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 16:08:50,447 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-23 16:08:50,447 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-23 16:08:50,451 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-23 16:08:50,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-23 16:08:50,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-23 16:08:50,468 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 2 states. [2018-10-23 16:08:50,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:08:50,493 INFO L93 Difference]: Finished difference Result 49 states and 61 transitions. [2018-10-23 16:08:50,493 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-23 16:08:50,494 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-10-23 16:08:50,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:08:50,503 INFO L225 Difference]: With dead ends: 49 [2018-10-23 16:08:50,503 INFO L226 Difference]: Without dead ends: 24 [2018-10-23 16:08:50,508 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 [2018-10-23 16:08:50,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-23 16:08:50,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-23 16:08:50,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-23 16:08:50,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2018-10-23 16:08:50,545 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 15 [2018-10-23 16:08:50,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:08:50,546 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2018-10-23 16:08:50,546 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-23 16:08:50,546 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2018-10-23 16:08:50,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-23 16:08:50,547 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:08:50,548 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:08:50,548 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:08:50,548 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:08:50,549 INFO L82 PathProgramCache]: Analyzing trace with hash -194164888, now seen corresponding path program 1 times [2018-10-23 16:08:50,549 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:08:50,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:08:50,550 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:08:50,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:08:50,551 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:08:50,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:08:50,675 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:08:50,676 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 16:08:50,676 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-23 16:08:50,676 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-23 16:08:50,678 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-23 16:08:50,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-23 16:08:50,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-23 16:08:50,679 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand 3 states. [2018-10-23 16:08:50,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:08:50,818 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2018-10-23 16:08:50,819 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-23 16:08:50,819 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2018-10-23 16:08:50,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:08:50,820 INFO L225 Difference]: With dead ends: 48 [2018-10-23 16:08:50,820 INFO L226 Difference]: Without dead ends: 33 [2018-10-23 16:08:50,822 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-23 16:08:50,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-23 16:08:50,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 29. [2018-10-23 16:08:50,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-23 16:08:50,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2018-10-23 16:08:50,831 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 16 [2018-10-23 16:08:50,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:08:50,832 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2018-10-23 16:08:50,832 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-23 16:08:50,832 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2018-10-23 16:08:50,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-23 16:08:50,833 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:08:50,833 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:08:50,833 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:08:50,833 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:08:50,834 INFO L82 PathProgramCache]: Analyzing trace with hash 706658557, now seen corresponding path program 1 times [2018-10-23 16:08:50,834 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:08:50,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:08:50,835 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:08:50,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:08:50,835 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:08:50,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:08:50,981 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:08:50,981 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:08:50,982 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:08:50,982 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-10-23 16:08:50,984 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [29], [32], [46], [49], [51], [57], [58], [59], [61] [2018-10-23 16:08:51,038 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-23 16:08:51,038 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-23 16:08:51,214 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-23 16:08:52,697 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-23 16:08:52,699 INFO L272 AbstractInterpreter]: Visited 18 different actions 166 times. Merged at 4 different actions 118 times. Widened at 1 different actions 26 times. Found 29 fixpoints after 2 different actions. Largest state had 29 variables. [2018-10-23 16:08:52,746 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:08:52,748 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-23 16:08:52,748 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:08:52,748 INFO L194 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 [2018-10-23 16:08:52,768 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:08:52,768 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 16:08:52,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:08:52,826 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:08:52,914 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 8 [2018-10-23 16:08:52,919 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2018-10-23 16:08:52,920 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-23 16:08:52,938 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-23 16:08:52,971 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-23 16:08:52,971 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:11, output treesize:7 [2018-10-23 16:08:53,180 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2018-10-23 16:08:53,183 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2018-10-23 16:08:53,183 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-23 16:08:53,205 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-23 16:08:53,209 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-23 16:08:53,210 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:15, output treesize:3 [2018-10-23 16:08:53,350 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:08:53,350 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:08:53,600 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 18 [2018-10-23 16:08:53,745 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 24 [2018-10-23 16:08:53,787 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2018-10-23 16:08:53,790 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-23 16:08:53,791 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-23 16:08:53,795 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 25 [2018-10-23 16:08:53,862 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2018-10-23 16:08:53,864 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-10-23 16:08:53,894 INFO L267 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-23 16:08:53,917 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-23 16:08:53,917 INFO L202 ElimStorePlain]: Needed 5 recursive calls to eliminate 6 variables, input treesize:88, output treesize:7 [2018-10-23 16:08:53,939 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:08:53,961 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:08:53,962 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 8, 8] total 15 [2018-10-23 16:08:53,962 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:08:53,963 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-23 16:08:53,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-23 16:08:53,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2018-10-23 16:08:53,964 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 9 states. [2018-10-23 16:08:58,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:08:58,476 INFO L93 Difference]: Finished difference Result 87 states and 103 transitions. [2018-10-23 16:08:58,478 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-23 16:08:58,478 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2018-10-23 16:08:58,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:08:58,480 INFO L225 Difference]: With dead ends: 87 [2018-10-23 16:08:58,480 INFO L226 Difference]: Without dead ends: 69 [2018-10-23 16:08:58,481 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2018-10-23 16:08:58,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-23 16:08:58,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 50. [2018-10-23 16:08:58,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-23 16:08:58,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2018-10-23 16:08:58,494 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 19 [2018-10-23 16:08:58,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:08:58,494 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2018-10-23 16:08:58,494 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-23 16:08:58,494 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2018-10-23 16:08:58,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-23 16:08:58,495 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:08:58,495 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:08:58,496 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:08:58,496 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:08:58,496 INFO L82 PathProgramCache]: Analyzing trace with hash -1962567395, now seen corresponding path program 2 times [2018-10-23 16:08:58,496 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:08:58,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:08:58,498 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:08:58,498 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:08:58,498 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:08:58,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:08:58,723 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:08:58,723 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:08:58,723 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:08:58,723 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:08:58,724 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:08:58,724 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:08:58,724 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:08:58,739 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 16:08:58,740 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-23 16:08:58,803 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-23 16:08:58,804 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:08:58,807 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:08:58,857 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:08:58,858 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:09:00,229 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:00,250 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:09:00,250 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-23 16:09:00,251 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:09:00,251 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-23 16:09:00,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-23 16:09:00,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-23 16:09:00,252 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand 6 states. [2018-10-23 16:09:00,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:09:00,544 INFO L93 Difference]: Finished difference Result 93 states and 107 transitions. [2018-10-23 16:09:00,546 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-23 16:09:00,546 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 25 [2018-10-23 16:09:00,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:09:00,547 INFO L225 Difference]: With dead ends: 93 [2018-10-23 16:09:00,547 INFO L226 Difference]: Without dead ends: 60 [2018-10-23 16:09:00,548 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-23 16:09:00,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-23 16:09:00,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56. [2018-10-23 16:09:00,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-23 16:09:00,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 62 transitions. [2018-10-23 16:09:00,558 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 62 transitions. Word has length 25 [2018-10-23 16:09:00,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:09:00,558 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 62 transitions. [2018-10-23 16:09:00,558 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-23 16:09:00,558 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 62 transitions. [2018-10-23 16:09:00,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-23 16:09:00,559 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:09:00,560 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:09:00,560 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:09:00,560 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:09:00,560 INFO L82 PathProgramCache]: Analyzing trace with hash 296425256, now seen corresponding path program 3 times [2018-10-23 16:09:00,560 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:09:00,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:00,561 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:09:00,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:00,562 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:09:00,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:09:00,744 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:00,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:00,744 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:09:00,745 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:09:00,745 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:09:00,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:00,745 INFO L194 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 [2018-10-23 16:09:00,758 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 16:09:00,758 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 16:09:00,798 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 16:09:00,798 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:09:00,801 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:09:00,833 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:00,834 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:09:01,754 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:01,774 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:09:01,774 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-23 16:09:01,775 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:09:01,775 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-23 16:09:01,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-23 16:09:01,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-23 16:09:01,776 INFO L87 Difference]: Start difference. First operand 56 states and 62 transitions. Second operand 7 states. [2018-10-23 16:09:02,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:09:02,050 INFO L93 Difference]: Finished difference Result 105 states and 120 transitions. [2018-10-23 16:09:02,050 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-23 16:09:02,051 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 28 [2018-10-23 16:09:02,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:09:02,052 INFO L225 Difference]: With dead ends: 105 [2018-10-23 16:09:02,052 INFO L226 Difference]: Without dead ends: 69 [2018-10-23 16:09:02,053 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-23 16:09:02,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-23 16:09:02,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 65. [2018-10-23 16:09:02,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-10-23 16:09:02,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 72 transitions. [2018-10-23 16:09:02,063 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 72 transitions. Word has length 28 [2018-10-23 16:09:02,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:09:02,063 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 72 transitions. [2018-10-23 16:09:02,063 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-23 16:09:02,063 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 72 transitions. [2018-10-23 16:09:02,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-23 16:09:02,064 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:09:02,064 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:09:02,065 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:09:02,065 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:09:02,065 INFO L82 PathProgramCache]: Analyzing trace with hash 103930173, now seen corresponding path program 4 times [2018-10-23 16:09:02,065 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:09:02,066 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:02,066 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:09:02,066 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:02,066 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:09:02,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:09:02,248 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:02,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:02,249 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:09:02,250 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:09:02,250 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:09:02,250 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:02,250 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:09:02,267 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:09:02,267 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 16:09:02,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:09:02,295 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:09:02,323 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:02,323 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:09:03,073 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:03,093 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:09:03,094 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-23 16:09:03,094 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:09:03,094 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-23 16:09:03,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-23 16:09:03,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-23 16:09:03,095 INFO L87 Difference]: Start difference. First operand 65 states and 72 transitions. Second operand 8 states. [2018-10-23 16:09:03,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:09:03,407 INFO L93 Difference]: Finished difference Result 120 states and 137 transitions. [2018-10-23 16:09:03,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-23 16:09:03,409 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2018-10-23 16:09:03,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:09:03,410 INFO L225 Difference]: With dead ends: 120 [2018-10-23 16:09:03,410 INFO L226 Difference]: Without dead ends: 78 [2018-10-23 16:09:03,411 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-23 16:09:03,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-23 16:09:03,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 74. [2018-10-23 16:09:03,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-23 16:09:03,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 82 transitions. [2018-10-23 16:09:03,420 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 82 transitions. Word has length 31 [2018-10-23 16:09:03,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:09:03,421 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 82 transitions. [2018-10-23 16:09:03,421 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-23 16:09:03,421 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 82 transitions. [2018-10-23 16:09:03,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-23 16:09:03,422 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:09:03,422 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:09:03,422 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:09:03,423 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:09:03,423 INFO L82 PathProgramCache]: Analyzing trace with hash -735747320, now seen corresponding path program 5 times [2018-10-23 16:09:03,423 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:09:03,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:03,424 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:09:03,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:03,424 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:09:03,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:09:03,704 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:03,704 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:03,705 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:09:03,705 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:09:03,705 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:09:03,705 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:03,705 INFO L194 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 [2018-10-23 16:09:03,714 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 16:09:03,714 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-23 16:09:04,006 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-23 16:09:04,006 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:09:04,011 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:09:04,052 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:04,052 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:09:06,400 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:06,422 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:09:06,423 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-23 16:09:06,423 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:09:06,423 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-23 16:09:06,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-23 16:09:06,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=161, Unknown=1, NotChecked=0, Total=240 [2018-10-23 16:09:06,424 INFO L87 Difference]: Start difference. First operand 74 states and 82 transitions. Second operand 9 states. [2018-10-23 16:09:06,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:09:06,783 INFO L93 Difference]: Finished difference Result 135 states and 154 transitions. [2018-10-23 16:09:06,785 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-23 16:09:06,785 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 34 [2018-10-23 16:09:06,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:09:06,786 INFO L225 Difference]: With dead ends: 135 [2018-10-23 16:09:06,786 INFO L226 Difference]: Without dead ends: 87 [2018-10-23 16:09:06,787 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=78, Invalid=161, Unknown=1, NotChecked=0, Total=240 [2018-10-23 16:09:06,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-23 16:09:06,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 83. [2018-10-23 16:09:06,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-10-23 16:09:06,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 92 transitions. [2018-10-23 16:09:06,798 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 92 transitions. Word has length 34 [2018-10-23 16:09:06,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:09:06,798 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 92 transitions. [2018-10-23 16:09:06,798 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-23 16:09:06,798 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 92 transitions. [2018-10-23 16:09:06,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-23 16:09:06,799 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:09:06,799 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:09:06,800 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:09:06,800 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:09:06,801 INFO L82 PathProgramCache]: Analyzing trace with hash -1678409379, now seen corresponding path program 6 times [2018-10-23 16:09:06,801 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:09:06,802 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:06,802 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:09:06,802 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:06,803 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:09:06,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:09:07,014 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:07,015 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:07,015 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:09:07,015 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:09:07,015 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:09:07,015 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:07,015 INFO L194 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 [2018-10-23 16:09:07,023 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 16:09:07,023 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 16:09:07,055 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 16:09:07,055 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:09:07,059 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:09:07,103 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:07,103 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:09:08,348 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:08,368 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:09:08,368 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-23 16:09:08,368 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:09:08,369 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-23 16:09:08,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-23 16:09:08,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-23 16:09:08,370 INFO L87 Difference]: Start difference. First operand 83 states and 92 transitions. Second operand 10 states. [2018-10-23 16:09:08,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:09:08,844 INFO L93 Difference]: Finished difference Result 150 states and 171 transitions. [2018-10-23 16:09:08,845 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-23 16:09:08,845 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 37 [2018-10-23 16:09:08,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:09:08,846 INFO L225 Difference]: With dead ends: 150 [2018-10-23 16:09:08,846 INFO L226 Difference]: Without dead ends: 96 [2018-10-23 16:09:08,847 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-23 16:09:08,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-23 16:09:08,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 92. [2018-10-23 16:09:08,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-10-23 16:09:08,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 102 transitions. [2018-10-23 16:09:08,857 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 102 transitions. Word has length 37 [2018-10-23 16:09:08,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:09:08,857 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 102 transitions. [2018-10-23 16:09:08,857 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-23 16:09:08,857 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 102 transitions. [2018-10-23 16:09:08,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-23 16:09:08,858 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:09:08,859 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:09:08,859 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:09:08,859 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:09:08,859 INFO L82 PathProgramCache]: Analyzing trace with hash 267339496, now seen corresponding path program 7 times [2018-10-23 16:09:08,859 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:09:08,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:08,860 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:09:08,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:08,860 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:09:08,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:09:09,186 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:09,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:09,186 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:09:09,187 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:09:09,187 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:09:09,187 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:09,187 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:09:09,200 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:09:09,200 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 16:09:09,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:09:09,234 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:09:09,271 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:09,271 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:09:12,961 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:12,981 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:09:12,981 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-23 16:09:12,981 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:09:12,982 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-23 16:09:12,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-23 16:09:12,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-23 16:09:12,982 INFO L87 Difference]: Start difference. First operand 92 states and 102 transitions. Second operand 11 states. [2018-10-23 16:09:13,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:09:13,474 INFO L93 Difference]: Finished difference Result 165 states and 188 transitions. [2018-10-23 16:09:13,475 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-23 16:09:13,475 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 40 [2018-10-23 16:09:13,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:09:13,476 INFO L225 Difference]: With dead ends: 165 [2018-10-23 16:09:13,476 INFO L226 Difference]: Without dead ends: 105 [2018-10-23 16:09:13,477 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-23 16:09:13,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-23 16:09:13,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 101. [2018-10-23 16:09:13,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-10-23 16:09:13,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 112 transitions. [2018-10-23 16:09:13,487 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 112 transitions. Word has length 40 [2018-10-23 16:09:13,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:09:13,487 INFO L481 AbstractCegarLoop]: Abstraction has 101 states and 112 transitions. [2018-10-23 16:09:13,488 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-23 16:09:13,488 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 112 transitions. [2018-10-23 16:09:13,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-23 16:09:13,489 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:09:13,489 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:09:13,489 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:09:13,489 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:09:13,490 INFO L82 PathProgramCache]: Analyzing trace with hash 1193447805, now seen corresponding path program 8 times [2018-10-23 16:09:13,490 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:09:13,490 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:13,491 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:09:13,491 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:13,491 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:09:13,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:09:13,963 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:13,964 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:13,964 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:09:13,964 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:09:13,964 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:09:13,964 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:13,965 INFO L194 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 [2018-10-23 16:09:13,975 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 16:09:13,976 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-23 16:09:14,641 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-23 16:09:14,642 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:09:14,646 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:09:14,677 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:14,677 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:09:15,388 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-23 16:09:17,945 WARN L179 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 12 [2018-10-23 16:09:18,628 WARN L179 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-23 16:09:20,055 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-23 16:09:20,066 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:20,087 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:09:20,087 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 13] total 23 [2018-10-23 16:09:20,087 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:09:20,088 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-23 16:09:20,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-23 16:09:20,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2018-10-23 16:09:20,089 INFO L87 Difference]: Start difference. First operand 101 states and 112 transitions. Second operand 12 states. [2018-10-23 16:09:20,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:09:20,966 INFO L93 Difference]: Finished difference Result 180 states and 205 transitions. [2018-10-23 16:09:20,966 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-23 16:09:20,966 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 43 [2018-10-23 16:09:20,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:09:20,968 INFO L225 Difference]: With dead ends: 180 [2018-10-23 16:09:20,968 INFO L226 Difference]: Without dead ends: 114 [2018-10-23 16:09:20,969 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 73 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2018-10-23 16:09:20,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-23 16:09:20,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 110. [2018-10-23 16:09:20,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-10-23 16:09:20,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 122 transitions. [2018-10-23 16:09:20,981 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 122 transitions. Word has length 43 [2018-10-23 16:09:20,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:09:20,981 INFO L481 AbstractCegarLoop]: Abstraction has 110 states and 122 transitions. [2018-10-23 16:09:20,981 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-23 16:09:20,981 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 122 transitions. [2018-10-23 16:09:20,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-23 16:09:20,982 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:09:20,983 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:09:20,983 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:09:20,983 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:09:20,983 INFO L82 PathProgramCache]: Analyzing trace with hash 16171720, now seen corresponding path program 9 times [2018-10-23 16:09:20,983 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:09:20,984 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:20,984 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:09:20,984 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:20,984 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:09:21,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:09:21,350 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:21,351 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:21,351 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:09:21,351 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:09:21,351 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:09:21,351 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:21,351 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:09:21,367 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 16:09:21,368 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 16:09:21,411 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 16:09:21,411 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:09:21,418 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:09:21,452 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:21,452 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:09:32,093 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 152 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:32,113 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:09:32,114 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-23 16:09:32,114 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:09:32,114 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-23 16:09:32,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-23 16:09:32,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=384, Unknown=2, NotChecked=0, Total=552 [2018-10-23 16:09:32,115 INFO L87 Difference]: Start difference. First operand 110 states and 122 transitions. Second operand 13 states. [2018-10-23 16:09:33,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:09:33,227 INFO L93 Difference]: Finished difference Result 195 states and 222 transitions. [2018-10-23 16:09:33,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-23 16:09:33,228 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 46 [2018-10-23 16:09:33,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:09:33,230 INFO L225 Difference]: With dead ends: 195 [2018-10-23 16:09:33,230 INFO L226 Difference]: Without dead ends: 123 [2018-10-23 16:09:33,231 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=166, Invalid=384, Unknown=2, NotChecked=0, Total=552 [2018-10-23 16:09:33,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-23 16:09:33,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 119. [2018-10-23 16:09:33,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-10-23 16:09:33,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 132 transitions. [2018-10-23 16:09:33,241 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 132 transitions. Word has length 46 [2018-10-23 16:09:33,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:09:33,242 INFO L481 AbstractCegarLoop]: Abstraction has 119 states and 132 transitions. [2018-10-23 16:09:33,242 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-23 16:09:33,242 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 132 transitions. [2018-10-23 16:09:33,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-23 16:09:33,244 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:09:33,244 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:09:33,244 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:09:33,244 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:09:33,244 INFO L82 PathProgramCache]: Analyzing trace with hash 487262621, now seen corresponding path program 10 times [2018-10-23 16:09:33,245 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:09:33,245 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:33,245 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:09:33,246 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:33,246 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:09:33,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:09:33,895 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:33,895 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:33,895 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:09:33,896 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:09:33,896 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:09:33,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:33,896 INFO L194 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 [2018-10-23 16:09:33,913 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:09:33,914 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 16:09:33,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:09:33,960 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:09:33,975 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:33,975 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:09:43,636 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 181 refuted. 6 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:43,657 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:09:43,658 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-23 16:09:43,658 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:09:43,658 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-23 16:09:43,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-23 16:09:43,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=455, Unknown=2, NotChecked=0, Total=650 [2018-10-23 16:09:43,659 INFO L87 Difference]: Start difference. First operand 119 states and 132 transitions. Second operand 14 states. [2018-10-23 16:09:44,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:09:44,399 INFO L93 Difference]: Finished difference Result 210 states and 239 transitions. [2018-10-23 16:09:44,401 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-23 16:09:44,401 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 49 [2018-10-23 16:09:44,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:09:44,402 INFO L225 Difference]: With dead ends: 210 [2018-10-23 16:09:44,402 INFO L226 Difference]: Without dead ends: 132 [2018-10-23 16:09:44,403 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 85 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=193, Invalid=455, Unknown=2, NotChecked=0, Total=650 [2018-10-23 16:09:44,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-10-23 16:09:44,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 128. [2018-10-23 16:09:44,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-23 16:09:44,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 142 transitions. [2018-10-23 16:09:44,412 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 142 transitions. Word has length 49 [2018-10-23 16:09:44,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:09:44,413 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 142 transitions. [2018-10-23 16:09:44,413 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-23 16:09:44,413 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 142 transitions. [2018-10-23 16:09:44,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-23 16:09:44,414 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:09:44,414 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:09:44,414 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:09:44,414 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:09:44,415 INFO L82 PathProgramCache]: Analyzing trace with hash -1196829016, now seen corresponding path program 11 times [2018-10-23 16:09:44,415 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:09:44,415 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:44,416 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:09:44,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:09:44,416 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:09:44,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:09:44,720 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:44,720 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:44,720 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:09:44,720 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:09:44,720 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:09:44,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:09:44,721 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:09:44,728 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 16:09:44,728 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-23 16:09:50,141 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-10-23 16:09:50,141 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:09:50,149 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:09:50,193 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:50,193 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:09:59,132 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:09:59,153 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:09:59,154 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-23 16:09:59,154 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:09:59,154 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-23 16:09:59,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-23 16:09:59,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=533, Unknown=1, NotChecked=0, Total=756 [2018-10-23 16:09:59,155 INFO L87 Difference]: Start difference. First operand 128 states and 142 transitions. Second operand 15 states. [2018-10-23 16:10:00,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:10:00,193 INFO L93 Difference]: Finished difference Result 225 states and 256 transitions. [2018-10-23 16:10:00,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-23 16:10:00,193 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 52 [2018-10-23 16:10:00,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:10:00,195 INFO L225 Difference]: With dead ends: 225 [2018-10-23 16:10:00,195 INFO L226 Difference]: Without dead ends: 141 [2018-10-23 16:10:00,197 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=222, Invalid=533, Unknown=1, NotChecked=0, Total=756 [2018-10-23 16:10:00,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2018-10-23 16:10:00,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 137. [2018-10-23 16:10:00,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2018-10-23 16:10:00,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 152 transitions. [2018-10-23 16:10:00,207 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 152 transitions. Word has length 52 [2018-10-23 16:10:00,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:10:00,207 INFO L481 AbstractCegarLoop]: Abstraction has 137 states and 152 transitions. [2018-10-23 16:10:00,207 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-23 16:10:00,207 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 152 transitions. [2018-10-23 16:10:00,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-23 16:10:00,208 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:10:00,208 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:10:00,209 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:10:00,209 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:10:00,209 INFO L82 PathProgramCache]: Analyzing trace with hash 1837164989, now seen corresponding path program 12 times [2018-10-23 16:10:00,209 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:10:00,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:10:00,210 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:10:00,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:10:00,210 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:10:00,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:10:00,568 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:10:00,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:10:00,568 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:10:00,568 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:10:00,568 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:10:00,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:10:00,568 INFO L194 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 [2018-10-23 16:10:00,577 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 16:10:00,577 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 16:10:00,620 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 16:10:00,620 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:10:00,623 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:10:00,661 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:10:00,661 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:10:10,316 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:10:10,337 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:10:10,337 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-23 16:10:10,338 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:10:10,338 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-23 16:10:10,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-23 16:10:10,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-23 16:10:10,339 INFO L87 Difference]: Start difference. First operand 137 states and 152 transitions. Second operand 16 states. [2018-10-23 16:10:11,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:10:11,207 INFO L93 Difference]: Finished difference Result 240 states and 273 transitions. [2018-10-23 16:10:11,208 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-23 16:10:11,208 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 55 [2018-10-23 16:10:11,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:10:11,210 INFO L225 Difference]: With dead ends: 240 [2018-10-23 16:10:11,210 INFO L226 Difference]: Without dead ends: 150 [2018-10-23 16:10:11,211 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 95 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-23 16:10:11,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-10-23 16:10:11,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 146. [2018-10-23 16:10:11,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2018-10-23 16:10:11,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 162 transitions. [2018-10-23 16:10:11,219 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 162 transitions. Word has length 55 [2018-10-23 16:10:11,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:10:11,219 INFO L481 AbstractCegarLoop]: Abstraction has 146 states and 162 transitions. [2018-10-23 16:10:11,219 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-23 16:10:11,219 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 162 transitions. [2018-10-23 16:10:11,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-10-23 16:10:11,220 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:10:11,221 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:10:11,221 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:10:11,221 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:10:11,221 INFO L82 PathProgramCache]: Analyzing trace with hash -34176376, now seen corresponding path program 13 times [2018-10-23 16:10:11,221 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:10:11,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:10:11,222 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:10:11,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:10:11,222 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:10:11,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:10:11,917 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:10:11,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:10:11,917 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:10:11,917 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:10:11,918 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:10:11,918 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:10:11,918 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:10:11,925 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:10:11,926 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 16:10:11,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:10:11,977 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:10:12,029 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:10:12,029 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:10:24,069 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 298 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:10:24,090 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:10:24,090 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-23 16:10:24,090 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:10:24,091 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-23 16:10:24,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-23 16:10:24,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=705, Unknown=1, NotChecked=0, Total=992 [2018-10-23 16:10:24,092 INFO L87 Difference]: Start difference. First operand 146 states and 162 transitions. Second operand 17 states. [2018-10-23 16:10:25,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:10:25,608 INFO L93 Difference]: Finished difference Result 255 states and 290 transitions. [2018-10-23 16:10:25,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-23 16:10:25,609 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 58 [2018-10-23 16:10:25,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:10:25,610 INFO L225 Difference]: With dead ends: 255 [2018-10-23 16:10:25,610 INFO L226 Difference]: Without dead ends: 159 [2018-10-23 16:10:25,611 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 100 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=286, Invalid=705, Unknown=1, NotChecked=0, Total=992 [2018-10-23 16:10:25,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2018-10-23 16:10:25,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 155. [2018-10-23 16:10:25,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 155 states. [2018-10-23 16:10:25,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 172 transitions. [2018-10-23 16:10:25,622 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 172 transitions. Word has length 58 [2018-10-23 16:10:25,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:10:25,622 INFO L481 AbstractCegarLoop]: Abstraction has 155 states and 172 transitions. [2018-10-23 16:10:25,622 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-23 16:10:25,622 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 172 transitions. [2018-10-23 16:10:25,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-23 16:10:25,623 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:10:25,623 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:10:25,624 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:10:25,624 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:10:25,624 INFO L82 PathProgramCache]: Analyzing trace with hash -489279011, now seen corresponding path program 14 times [2018-10-23 16:10:25,624 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:10:25,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:10:25,625 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:10:25,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:10:25,625 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:10:25,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:10:25,956 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:10:25,956 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:10:25,956 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:10:25,956 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:10:25,956 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:10:25,956 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:10:25,956 INFO L194 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 [2018-10-23 16:10:25,963 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 16:10:25,964 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-23 16:10:40,152 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-23 16:10:40,153 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:10:40,164 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:10:40,252 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:10:40,252 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:10:42,341 WARN L854 $PredicateComparison]: unable to prove that (or (< (mod (+ c_main_~index~0 2) 4294967296) 1000) (<= 1000 (mod (+ c_main_~index~0 1) 4294967296))) is different from true [2018-10-23 16:10:43,933 WARN L179 SmtUtils]: Spent 912.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-23 16:10:47,683 WARN L179 SmtUtils]: Spent 1.41 s on a formula simplification that was a NOOP. DAG size: 12 [2018-10-23 16:10:48,381 WARN L179 SmtUtils]: Spent 226.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-23 16:10:51,546 WARN L179 SmtUtils]: Spent 571.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-23 16:10:52,268 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 44 not checked. [2018-10-23 16:10:52,289 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:10:52,290 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 19] total 35 [2018-10-23 16:10:52,290 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:10:52,290 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-23 16:10:52,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-23 16:10:52,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=801, Unknown=1, NotChecked=64, Total=1190 [2018-10-23 16:10:52,291 INFO L87 Difference]: Start difference. First operand 155 states and 172 transitions. Second operand 18 states. [2018-10-23 16:10:53,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:10:53,436 INFO L93 Difference]: Finished difference Result 270 states and 307 transitions. [2018-10-23 16:10:53,437 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-23 16:10:53,437 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 61 [2018-10-23 16:10:53,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:10:53,439 INFO L225 Difference]: With dead ends: 270 [2018-10-23 16:10:53,439 INFO L226 Difference]: Without dead ends: 168 [2018-10-23 16:10:53,440 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 103 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=324, Invalid=801, Unknown=1, NotChecked=64, Total=1190 [2018-10-23 16:10:53,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2018-10-23 16:10:53,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 164. [2018-10-23 16:10:53,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2018-10-23 16:10:53,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 182 transitions. [2018-10-23 16:10:53,448 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 182 transitions. Word has length 61 [2018-10-23 16:10:53,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:10:53,448 INFO L481 AbstractCegarLoop]: Abstraction has 164 states and 182 transitions. [2018-10-23 16:10:53,448 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-23 16:10:53,449 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 182 transitions. [2018-10-23 16:10:53,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-23 16:10:53,449 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:10:53,450 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:10:53,450 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:10:53,450 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:10:53,450 INFO L82 PathProgramCache]: Analyzing trace with hash 759875176, now seen corresponding path program 15 times [2018-10-23 16:10:53,450 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:10:53,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:10:53,451 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:10:53,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:10:53,451 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:10:53,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:10:53,797 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:10:53,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:10:53,798 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:10:53,798 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:10:53,798 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:10:53,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:10:53,798 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:10:53,806 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 16:10:53,807 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 16:10:53,856 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 16:10:53,856 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:10:53,859 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:10:53,909 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:10:53,909 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:11:13,624 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 383 refuted. 9 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:11:13,646 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:11:13,646 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-23 16:11:13,646 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:11:13,646 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-23 16:11:13,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-23 16:11:13,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=898, Unknown=4, NotChecked=0, Total=1260 [2018-10-23 16:11:13,649 INFO L87 Difference]: Start difference. First operand 164 states and 182 transitions. Second operand 19 states. [2018-10-23 16:11:14,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:11:14,947 INFO L93 Difference]: Finished difference Result 285 states and 324 transitions. [2018-10-23 16:11:14,949 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-23 16:11:14,949 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 64 [2018-10-23 16:11:14,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:11:14,950 INFO L225 Difference]: With dead ends: 285 [2018-10-23 16:11:14,950 INFO L226 Difference]: Without dead ends: 177 [2018-10-23 16:11:14,952 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 110 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 20.0s TimeCoverageRelationStatistics Valid=358, Invalid=898, Unknown=4, NotChecked=0, Total=1260 [2018-10-23 16:11:14,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-10-23 16:11:14,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 173. [2018-10-23 16:11:14,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2018-10-23 16:11:14,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 192 transitions. [2018-10-23 16:11:14,961 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 192 transitions. Word has length 64 [2018-10-23 16:11:14,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:11:14,961 INFO L481 AbstractCegarLoop]: Abstraction has 173 states and 192 transitions. [2018-10-23 16:11:14,961 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-23 16:11:14,961 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 192 transitions. [2018-10-23 16:11:14,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-23 16:11:14,962 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:11:14,962 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:11:14,962 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:11:14,962 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:11:14,963 INFO L82 PathProgramCache]: Analyzing trace with hash -1579359747, now seen corresponding path program 16 times [2018-10-23 16:11:14,963 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:11:14,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:11:14,964 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:11:14,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:11:14,964 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:11:14,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:11:15,308 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:11:15,309 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:11:15,309 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:11:15,309 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:11:15,309 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:11:15,309 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:11:15,309 INFO L194 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 [2018-10-23 16:11:15,317 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:11:15,317 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 16:11:15,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:11:15,371 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:11:15,390 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:11:15,390 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:11:28,814 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:11:28,836 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:11:28,836 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-23 16:11:28,836 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:11:28,837 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-23 16:11:28,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-23 16:11:28,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-10-23 16:11:28,838 INFO L87 Difference]: Start difference. First operand 173 states and 192 transitions. Second operand 20 states. [2018-10-23 16:11:30,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:11:30,315 INFO L93 Difference]: Finished difference Result 300 states and 341 transitions. [2018-10-23 16:11:30,321 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-23 16:11:30,321 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2018-10-23 16:11:30,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:11:30,322 INFO L225 Difference]: With dead ends: 300 [2018-10-23 16:11:30,322 INFO L226 Difference]: Without dead ends: 186 [2018-10-23 16:11:30,324 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 115 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-10-23 16:11:30,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-10-23 16:11:30,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 182. [2018-10-23 16:11:30,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2018-10-23 16:11:30,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 202 transitions. [2018-10-23 16:11:30,332 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 202 transitions. Word has length 67 [2018-10-23 16:11:30,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:11:30,332 INFO L481 AbstractCegarLoop]: Abstraction has 182 states and 202 transitions. [2018-10-23 16:11:30,332 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-23 16:11:30,332 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 202 transitions. [2018-10-23 16:11:30,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-10-23 16:11:30,333 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:11:30,333 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:11:30,333 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:11:30,334 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:11:30,334 INFO L82 PathProgramCache]: Analyzing trace with hash 412394056, now seen corresponding path program 17 times [2018-10-23 16:11:30,334 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:11:30,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:11:30,335 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:11:30,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:11:30,335 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:11:30,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:11:31,035 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:11:31,036 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:11:31,036 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:11:31,036 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:11:31,036 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:11:31,036 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:11:31,036 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:11:31,048 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 16:11:31,049 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-23 16:12:13,140 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-10-23 16:12:13,141 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:12:13,159 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:12:13,204 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:12:13,204 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:12:14,738 WARN L179 SmtUtils]: Spent 203.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-23 16:12:15,242 WARN L179 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-23 16:12:15,783 WARN L179 SmtUtils]: Spent 212.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-23 16:12:19,694 WARN L179 SmtUtils]: Spent 2.06 s on a formula simplification that was a NOOP. DAG size: 12 [2018-10-23 16:12:20,066 WARN L179 SmtUtils]: Spent 198.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-23 16:12:22,537 WARN L179 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-23 16:12:23,567 WARN L179 SmtUtils]: Spent 676.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-23 16:12:24,780 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:12:24,803 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:12:24,804 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 22] total 41 [2018-10-23 16:12:24,804 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:12:24,804 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-23 16:12:24,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-23 16:12:24,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2018-10-23 16:12:24,806 INFO L87 Difference]: Start difference. First operand 182 states and 202 transitions. Second operand 21 states. [2018-10-23 16:12:26,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:12:26,379 INFO L93 Difference]: Finished difference Result 315 states and 358 transitions. [2018-10-23 16:12:26,380 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-23 16:12:26,380 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 70 [2018-10-23 16:12:26,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:12:26,382 INFO L225 Difference]: With dead ends: 315 [2018-10-23 16:12:26,382 INFO L226 Difference]: Without dead ends: 195 [2018-10-23 16:12:26,384 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 118 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2018-10-23 16:12:26,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2018-10-23 16:12:26,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 191. [2018-10-23 16:12:26,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 191 states. [2018-10-23 16:12:26,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 212 transitions. [2018-10-23 16:12:26,393 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 212 transitions. Word has length 70 [2018-10-23 16:12:26,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:12:26,394 INFO L481 AbstractCegarLoop]: Abstraction has 191 states and 212 transitions. [2018-10-23 16:12:26,394 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-23 16:12:26,394 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 212 transitions. [2018-10-23 16:12:26,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-10-23 16:12:26,394 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:12:26,395 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:12:26,395 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:12:26,395 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:12:26,395 INFO L82 PathProgramCache]: Analyzing trace with hash 1776744989, now seen corresponding path program 18 times [2018-10-23 16:12:26,395 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:12:26,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:12:26,396 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:12:26,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:12:26,396 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:12:26,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:12:27,226 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:12:27,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:12:27,226 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:12:27,226 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:12:27,226 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:12:27,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:12:27,226 INFO L194 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 [2018-10-23 16:12:27,234 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 16:12:27,235 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 16:12:27,292 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 16:12:27,293 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 16:12:27,296 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:12:27,337 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:12:27,338 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 16:13:02,485 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 536 refuted. 15 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:13:02,506 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 16:13:02,506 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-23 16:13:02,506 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 16:13:02,507 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-23 16:13:02,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-23 16:13:02,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1234, Unknown=7, NotChecked=0, Total=1722 [2018-10-23 16:13:02,508 INFO L87 Difference]: Start difference. First operand 191 states and 212 transitions. Second operand 22 states. [2018-10-23 16:13:05,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 16:13:05,900 INFO L93 Difference]: Finished difference Result 330 states and 375 transitions. [2018-10-23 16:13:05,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-23 16:13:05,900 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 73 [2018-10-23 16:13:05,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 16:13:05,902 INFO L225 Difference]: With dead ends: 330 [2018-10-23 16:13:05,903 INFO L226 Difference]: Without dead ends: 204 [2018-10-23 16:13:05,904 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 125 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 35.8s TimeCoverageRelationStatistics Valid=481, Invalid=1234, Unknown=7, NotChecked=0, Total=1722 [2018-10-23 16:13:05,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2018-10-23 16:13:05,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 200. [2018-10-23 16:13:05,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2018-10-23 16:13:05,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 222 transitions. [2018-10-23 16:13:05,914 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 222 transitions. Word has length 73 [2018-10-23 16:13:05,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 16:13:05,914 INFO L481 AbstractCegarLoop]: Abstraction has 200 states and 222 transitions. [2018-10-23 16:13:05,914 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-23 16:13:05,914 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 222 transitions. [2018-10-23 16:13:05,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-23 16:13:05,915 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 16:13:05,915 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 16:13:05,915 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 16:13:05,915 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 16:13:05,916 INFO L82 PathProgramCache]: Analyzing trace with hash -415099352, now seen corresponding path program 19 times [2018-10-23 16:13:05,916 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 16:13:05,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:13:05,916 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 16:13:05,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 16:13:05,917 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 16:13:05,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:13:06,984 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:13:06,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:13:06,985 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 16:13:06,985 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 16:13:06,985 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 16:13:06,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 16:13:06,985 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:13:06,993 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 16:13:06,994 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 16:13:07,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 16:13:07,059 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 16:13:07,117 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 16:13:07,118 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-10-23 16:13:25,875 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-23 16:13:26,076 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 16:13:26,077 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-23 16:13:26,082 WARN L205 ceAbstractionStarter]: Timeout [2018-10-23 16:13:26,082 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 04:13:26 BoogieIcfgContainer [2018-10-23 16:13:26,082 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-23 16:13:26,083 INFO L168 Benchmark]: Toolchain (without parser) took 276906.18 ms. Allocated memory was 1.5 GB in the beginning and 2.5 GB in the end (delta: 956.3 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -719.8 MB). Peak memory consumption was 236.5 MB. Max. memory is 7.1 GB. [2018-10-23 16:13:26,084 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-23 16:13:26,084 INFO L168 Benchmark]: CACSL2BoogieTranslator took 260.74 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-23 16:13:26,085 INFO L168 Benchmark]: Boogie Procedure Inliner took 41.96 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-23 16:13:26,085 INFO L168 Benchmark]: Boogie Preprocessor took 30.08 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-23 16:13:26,086 INFO L168 Benchmark]: RCFGBuilder took 680.01 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 726.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -767.5 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. [2018-10-23 16:13:26,086 INFO L168 Benchmark]: TraceAbstraction took 275885.36 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 230.2 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 37.2 MB). Peak memory consumption was 267.3 MB. Max. memory is 7.1 GB. [2018-10-23 16:13:26,090 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 260.74 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 41.96 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 30.08 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 680.01 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 726.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -767.5 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 275885.36 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 230.2 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 37.2 MB). Peak memory consumption was 267.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 11]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 11). Cancelled while BasicCegarLoop was analyzing trace of length 77 with TraceHistMax 21,while TraceCheckSpWp was constructing backward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 41 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 29 locations, 1 error locations. TIMEOUT Result, 275.8s OverallTime, 21 OverallIterations, 21 TraceHistogramMax, 22.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 1356 SDtfs, 873 SDslu, 13427 SDs, 0 SdLazy, 17673 SolverSat, 240 SolverUnsat, 2 SolverUnknown, 0 SolverNotchecked, 18.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1936 GetRequests, 1470 SyntacticMatches, 38 SemanticMatches, 428 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 165.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=200occurred in iteration=20, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 1.7s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 20 MinimizatonAttempts, 91 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 63.5s SatisfiabilityAnalysisTime, 166.9s InterpolantComputationTime, 1735 NumberOfCodeBlocks, 1735 NumberOfCodeBlocksAsserted, 107 NumberOfCheckSat, 2531 ConstructedInterpolants, 0 QuantifiedInterpolants, 749257 SizeOfPredicates, 40 NumberOfNonLiveVariables, 3910 ConjunctsInSsa, 470 ConjunctsInUnsatCore, 56 InterpolantComputations, 2 PerfectInterpolantSequences, 0/11379 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown