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-EXP.epf -i ../../../trunk/examples/svcomp/loops/n.c24_false-unreach-call.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 09:00:46,583 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 09:00:46,585 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 09:00:46,600 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 09:00:46,601 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 09:00:46,602 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 09:00:46,603 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 09:00:46,605 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 09:00:46,606 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 09:00:46,607 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 09:00:46,608 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 09:00:46,608 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 09:00:46,609 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 09:00:46,610 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 09:00:46,611 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 09:00:46,612 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 09:00:46,613 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 09:00:46,615 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 09:00:46,617 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 09:00:46,618 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 09:00:46,619 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 09:00:46,620 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 09:00:46,623 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 09:00:46,623 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 09:00:46,623 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 09:00:46,624 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 09:00:46,625 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 09:00:46,626 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 09:00:46,627 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 09:00:46,628 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 09:00:46,628 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 09:00:46,629 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-27 09:00:46,629 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-27 09:00:46,629 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-27 09:00:46,630 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-27 09:00:46,631 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-27 09:00:46,631 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-27 09:00:46,646 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 09:00:46,647 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 09:00:46,647 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 09:00:46,648 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 09:00:46,648 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 09:00:46,648 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 09:00:46,648 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-27 09:00:46,648 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 09:00:46,649 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 09:00:46,649 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 09:00:46,649 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 09:00:46,649 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 09:00:46,649 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 09:00:46,649 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-27 09:00:46,650 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 09:00:46,650 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 09:00:46,651 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 09:00:46,651 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 09:00:46,651 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 09:00:46,651 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 09:00:46,651 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 09:00:46,651 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 09:00:46,652 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 09:00:46,652 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 09:00:46,652 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 09:00:46,652 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 09:00:46,652 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 09:00:46,653 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 09:00:46,653 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 09:00:46,653 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 09:00:46,653 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 09:00:46,653 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 09:00:46,654 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 09:00:46,654 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 09:00:46,654 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 09:00:46,654 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 09:00:46,698 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 09:00:46,710 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 09:00:46,713 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 09:00:46,715 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 09:00:46,715 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 09:00:46,716 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops/n.c24_false-unreach-call.i [2018-10-27 09:00:46,774 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/cd90d9cd7/2c8f37937a0848deb068a054e290cd4d/FLAGaa273680b [2018-10-27 09:00:47,217 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 09:00:47,218 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/n.c24_false-unreach-call.i [2018-10-27 09:00:47,227 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/cd90d9cd7/2c8f37937a0848deb068a054e290cd4d/FLAGaa273680b [2018-10-27 09:00:47,245 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/cd90d9cd7/2c8f37937a0848deb068a054e290cd4d [2018-10-27 09:00:47,258 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 09:00:47,260 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 09:00:47,261 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 09:00:47,261 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 09:00:47,265 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 09:00:47,266 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:00:47" (1/1) ... [2018-10-27 09:00:47,269 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@18cb0e14 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:00:47, skipping insertion in model container [2018-10-27 09:00:47,269 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:00:47" (1/1) ... [2018-10-27 09:00:47,280 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 09:00:47,310 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 09:00:47,589 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:00:47,598 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 09:00:47,633 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:00:47,679 INFO L193 MainTranslator]: Completed translation [2018-10-27 09:00:47,679 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:00:47 WrapperNode [2018-10-27 09:00:47,680 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 09:00:47,681 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 09:00:47,681 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 09:00:47,681 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 09:00:47,692 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:00:47" (1/1) ... [2018-10-27 09:00:47,709 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:00:47" (1/1) ... [2018-10-27 09:00:47,752 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 09:00:47,753 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 09:00:47,753 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 09:00:47,753 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 09:00:47,765 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:00:47" (1/1) ... [2018-10-27 09:00:47,765 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:00:47" (1/1) ... [2018-10-27 09:00:47,769 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:00:47" (1/1) ... [2018-10-27 09:00:47,769 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:00:47" (1/1) ... [2018-10-27 09:00:47,785 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:00:47" (1/1) ... [2018-10-27 09:00:47,794 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:00:47" (1/1) ... [2018-10-27 09:00:47,796 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:00:47" (1/1) ... [2018-10-27 09:00:47,800 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 09:00:47,800 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 09:00:47,801 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 09:00:47,801 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 09:00:47,802 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:00:47" (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 [2018-10-27 09:00:47,953 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 09:00:47,954 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 09:00:47,954 INFO L130 BoogieDeclarations]: Found specification of procedure bar [2018-10-27 09:00:47,954 INFO L138 BoogieDeclarations]: Found implementation of procedure bar [2018-10-27 09:00:47,954 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 09:00:47,954 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 09:00:47,954 INFO L130 BoogieDeclarations]: Found specification of procedure foo [2018-10-27 09:00:47,955 INFO L138 BoogieDeclarations]: Found implementation of procedure foo [2018-10-27 09:00:47,955 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memmove [2018-10-27 09:00:47,955 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memmove [2018-10-27 09:00:47,955 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 09:00:47,955 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 09:00:47,955 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 09:00:47,955 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 09:00:48,563 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 09:00:48,564 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:00:48 BoogieIcfgContainer [2018-10-27 09:00:48,564 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 09:00:48,565 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 09:00:48,566 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 09:00:48,570 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 09:00:48,570 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 09:00:47" (1/3) ... [2018-10-27 09:00:48,571 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7dcd2b02 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:00:48, skipping insertion in model container [2018-10-27 09:00:48,572 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:00:47" (2/3) ... [2018-10-27 09:00:48,572 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7dcd2b02 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:00:48, skipping insertion in model container [2018-10-27 09:00:48,572 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:00:48" (3/3) ... [2018-10-27 09:00:48,574 INFO L112 eAbstractionObserver]: Analyzing ICFG n.c24_false-unreach-call.i [2018-10-27 09:00:48,585 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 09:00:48,594 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 09:00:48,612 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 09:00:48,647 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 09:00:48,648 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 09:00:48,648 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 09:00:48,648 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 09:00:48,648 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 09:00:48,649 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 09:00:48,649 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 09:00:48,649 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 09:00:48,670 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states. [2018-10-27 09:00:48,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-27 09:00:48,677 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:00:48,678 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:00:48,681 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:00:48,688 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:00:48,688 INFO L82 PathProgramCache]: Analyzing trace with hash 277346705, now seen corresponding path program 1 times [2018-10-27 09:00:48,691 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:00:48,752 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:00:48,752 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:00:48,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:00:48,753 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:00:48,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:00:48,846 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:00:48,848 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:00:48,849 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 09:00:48,849 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:00:48,853 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 09:00:48,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 09:00:48,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 09:00:48,869 INFO L87 Difference]: Start difference. First operand 55 states. Second operand 2 states. [2018-10-27 09:00:48,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:00:48,898 INFO L93 Difference]: Finished difference Result 101 states and 134 transitions. [2018-10-27 09:00:48,898 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 09:00:48,899 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-10-27 09:00:48,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:00:48,911 INFO L225 Difference]: With dead ends: 101 [2018-10-27 09:00:48,911 INFO L226 Difference]: Without dead ends: 48 [2018-10-27 09:00:48,915 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 [2018-10-27 09:00:48,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-27 09:00:48,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-27 09:00:48,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-27 09:00:48,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 57 transitions. [2018-10-27 09:00:48,970 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 57 transitions. Word has length 13 [2018-10-27 09:00:48,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:00:48,971 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 57 transitions. [2018-10-27 09:00:48,971 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 09:00:48,972 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 57 transitions. [2018-10-27 09:00:48,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-27 09:00:48,973 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:00:48,973 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:00:48,974 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:00:48,974 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:00:48,974 INFO L82 PathProgramCache]: Analyzing trace with hash -1161873536, now seen corresponding path program 1 times [2018-10-27 09:00:48,974 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:00:48,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:00:48,978 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:00:48,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:00:48,978 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:00:49,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:00:49,111 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:00:49,111 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:00:49,111 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 09:00:49,112 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:00:49,113 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 09:00:49,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 09:00:49,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 09:00:49,114 INFO L87 Difference]: Start difference. First operand 48 states and 57 transitions. Second operand 3 states. [2018-10-27 09:00:49,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:00:49,333 INFO L93 Difference]: Finished difference Result 113 states and 142 transitions. [2018-10-27 09:00:49,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 09:00:49,334 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2018-10-27 09:00:49,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:00:49,336 INFO L225 Difference]: With dead ends: 113 [2018-10-27 09:00:49,337 INFO L226 Difference]: Without dead ends: 74 [2018-10-27 09:00:49,338 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 [2018-10-27 09:00:49,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-27 09:00:49,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 52. [2018-10-27 09:00:49,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-27 09:00:49,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 61 transitions. [2018-10-27 09:00:49,354 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 61 transitions. Word has length 15 [2018-10-27 09:00:49,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:00:49,355 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 61 transitions. [2018-10-27 09:00:49,355 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 09:00:49,355 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 61 transitions. [2018-10-27 09:00:49,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-27 09:00:49,356 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:00:49,356 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:00:49,356 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:00:49,357 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:00:49,357 INFO L82 PathProgramCache]: Analyzing trace with hash 1375381986, now seen corresponding path program 1 times [2018-10-27 09:00:49,357 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:00:49,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:00:49,358 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:00:49,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:00:49,359 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:00:49,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:00:49,486 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 09:00:49,486 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:00:49,486 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:00:49,487 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 26 with the following transitions: [2018-10-27 09:00:49,491 INFO L202 CegarAbsIntRunner]: [2], [3], [17], [21], [24], [26], [28], [32], [36], [39], [41], [45], [49], [53], [56], [113], [120], [123], [125], [131], [132], [133], [141] [2018-10-27 09:00:49,533 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-27 09:00:49,534 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 09:00:49,808 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 09:00:49,813 INFO L272 AbstractInterpreter]: Visited 23 different actions 47 times. Merged at 10 different actions 20 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 35 variables. [2018-10-27 09:00:49,820 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:00:49,822 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 09:00:49,822 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:00:49,822 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 [2018-10-27 09:00:49,831 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:00:49,831 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:00:49,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:00:49,878 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:00:49,979 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 09:00:49,979 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:00:50,149 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 09:00:50,177 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:00:50,178 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2018-10-27 09:00:50,178 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:00:50,178 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 09:00:50,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 09:00:50,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-27 09:00:50,179 INFO L87 Difference]: Start difference. First operand 52 states and 61 transitions. Second operand 5 states. [2018-10-27 09:00:50,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:00:50,411 INFO L93 Difference]: Finished difference Result 141 states and 180 transitions. [2018-10-27 09:00:50,411 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 09:00:50,412 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2018-10-27 09:00:50,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:00:50,415 INFO L225 Difference]: With dead ends: 141 [2018-10-27 09:00:50,416 INFO L226 Difference]: Without dead ends: 100 [2018-10-27 09:00:50,417 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-27 09:00:50,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-27 09:00:50,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 78. [2018-10-27 09:00:50,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-27 09:00:50,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 97 transitions. [2018-10-27 09:00:50,435 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 97 transitions. Word has length 25 [2018-10-27 09:00:50,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:00:50,436 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 97 transitions. [2018-10-27 09:00:50,436 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 09:00:50,436 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 97 transitions. [2018-10-27 09:00:50,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-27 09:00:50,438 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:00:50,438 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:00:50,439 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:00:50,439 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:00:50,439 INFO L82 PathProgramCache]: Analyzing trace with hash -103717632, now seen corresponding path program 2 times [2018-10-27 09:00:50,439 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:00:50,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:00:50,440 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:00:50,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:00:50,441 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:00:50,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:00:50,624 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2018-10-27 09:00:50,624 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:00:50,624 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:00:50,624 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:00:50,625 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:00:50,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:00:50,625 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 [2018-10-27 09:00:50,636 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:00:50,636 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:00:50,685 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-27 09:00:50,685 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:00:50,688 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:00:50,807 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2018-10-27 09:00:50,807 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:00:50,915 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2018-10-27 09:00:50,942 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-27 09:00:50,943 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5] total 11 [2018-10-27 09:00:50,943 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:00:50,943 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 09:00:50,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 09:00:50,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2018-10-27 09:00:50,945 INFO L87 Difference]: Start difference. First operand 78 states and 97 transitions. Second operand 5 states. [2018-10-27 09:00:51,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:00:51,009 INFO L93 Difference]: Finished difference Result 127 states and 166 transitions. [2018-10-27 09:00:51,010 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 09:00:51,010 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 35 [2018-10-27 09:00:51,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:00:51,012 INFO L225 Difference]: With dead ends: 127 [2018-10-27 09:00:51,012 INFO L226 Difference]: Without dead ends: 122 [2018-10-27 09:00:51,013 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2018-10-27 09:00:51,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2018-10-27 09:00:51,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 80. [2018-10-27 09:00:51,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-10-27 09:00:51,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 100 transitions. [2018-10-27 09:00:51,030 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 100 transitions. Word has length 35 [2018-10-27 09:00:51,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:00:51,034 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 100 transitions. [2018-10-27 09:00:51,034 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 09:00:51,034 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 100 transitions. [2018-10-27 09:00:51,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-27 09:00:51,036 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:00:51,036 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:00:51,036 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:00:51,036 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:00:51,037 INFO L82 PathProgramCache]: Analyzing trace with hash 1875911917, now seen corresponding path program 1 times [2018-10-27 09:00:51,037 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:00:51,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:00:51,038 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:00:51,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:00:51,038 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:00:51,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:00:51,252 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 09:00:51,253 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:00:51,253 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:00:51,253 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 46 with the following transitions: [2018-10-27 09:00:51,253 INFO L202 CegarAbsIntRunner]: [2], [3], [4], [5], [17], [21], [24], [26], [28], [32], [36], [39], [41], [45], [49], [53], [56], [58], [60], [64], [67], [109], [113], [120], [123], [125], [131], [132], [133], [135], [136], [141] [2018-10-27 09:00:51,256 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-27 09:00:51,257 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 09:00:51,547 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 09:00:51,550 INFO L272 AbstractInterpreter]: Visited 32 different actions 86 times. Merged at 16 different actions 38 times. Never widened. Found 6 fixpoints after 4 different actions. Largest state had 37 variables. [2018-10-27 09:00:51,576 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:00:51,576 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 09:00:51,576 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:00:51,576 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 [2018-10-27 09:00:51,586 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:00:51,587 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:00:51,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:00:51,638 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:00:51,671 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 09:00:51,672 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:00:51,824 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 09:00:51,846 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:00:51,846 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-10-27 09:00:51,846 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:00:51,846 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 09:00:51,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 09:00:51,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-27 09:00:51,847 INFO L87 Difference]: Start difference. First operand 80 states and 100 transitions. Second operand 6 states. [2018-10-27 09:00:51,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:00:52,000 INFO L93 Difference]: Finished difference Result 205 states and 268 transitions. [2018-10-27 09:00:52,000 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 09:00:52,000 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 45 [2018-10-27 09:00:52,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:00:52,002 INFO L225 Difference]: With dead ends: 205 [2018-10-27 09:00:52,003 INFO L226 Difference]: Without dead ends: 139 [2018-10-27 09:00:52,004 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-27 09:00:52,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-27 09:00:52,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 106. [2018-10-27 09:00:52,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-10-27 09:00:52,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 136 transitions. [2018-10-27 09:00:52,017 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 136 transitions. Word has length 45 [2018-10-27 09:00:52,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:00:52,018 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 136 transitions. [2018-10-27 09:00:52,018 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 09:00:52,018 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 136 transitions. [2018-10-27 09:00:52,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-27 09:00:52,020 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:00:52,021 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:00:52,021 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:00:52,021 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:00:52,021 INFO L82 PathProgramCache]: Analyzing trace with hash -588961457, now seen corresponding path program 2 times [2018-10-27 09:00:52,022 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:00:52,022 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:00:52,023 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:00:52,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:00:52,023 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:00:52,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:00:52,129 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2018-10-27 09:00:52,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:00:52,130 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:00:52,130 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:00:52,130 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:00:52,130 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:00:52,130 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 [2018-10-27 09:00:52,138 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:00:52,138 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:00:52,189 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 09:00:52,189 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:00:52,193 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:00:52,370 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-27 09:00:52,370 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:00:52,626 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-27 09:00:52,659 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:00:52,659 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 16 [2018-10-27 09:00:52,660 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:00:52,660 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 09:00:52,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 09:00:52,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2018-10-27 09:00:52,661 INFO L87 Difference]: Start difference. First operand 106 states and 136 transitions. Second operand 11 states. [2018-10-27 09:00:53,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:00:53,814 INFO L93 Difference]: Finished difference Result 462 states and 644 transitions. [2018-10-27 09:00:53,815 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 09:00:53,815 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 55 [2018-10-27 09:00:53,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:00:53,820 INFO L225 Difference]: With dead ends: 462 [2018-10-27 09:00:53,821 INFO L226 Difference]: Without dead ends: 370 [2018-10-27 09:00:53,823 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=224, Invalid=646, Unknown=0, NotChecked=0, Total=870 [2018-10-27 09:00:53,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2018-10-27 09:00:53,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 150. [2018-10-27 09:00:53,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-10-27 09:00:53,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 200 transitions. [2018-10-27 09:00:53,864 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 200 transitions. Word has length 55 [2018-10-27 09:00:53,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:00:53,865 INFO L481 AbstractCegarLoop]: Abstraction has 150 states and 200 transitions. [2018-10-27 09:00:53,865 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 09:00:53,865 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 200 transitions. [2018-10-27 09:00:53,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-10-27 09:00:53,872 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:00:53,873 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:00:53,873 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:00:53,873 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:00:53,873 INFO L82 PathProgramCache]: Analyzing trace with hash 175545882, now seen corresponding path program 3 times [2018-10-27 09:00:53,874 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:00:53,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:00:53,878 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:00:53,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:00:53,878 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:00:53,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:00:54,013 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-10-27 09:00:54,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:00:54,013 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:00:54,014 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:00:54,014 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:00:54,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:00:54,014 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 [2018-10-27 09:00:54,022 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:00:54,022 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:00:54,091 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:00:54,091 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:00:54,096 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:00:54,199 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-10-27 09:00:54,199 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:00:54,556 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-10-27 09:00:54,577 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:00:54,578 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-10-27 09:00:54,578 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:00:54,578 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 09:00:54,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 09:00:54,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-27 09:00:54,579 INFO L87 Difference]: Start difference. First operand 150 states and 200 transitions. Second operand 8 states. [2018-10-27 09:00:54,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:00:54,968 INFO L93 Difference]: Finished difference Result 375 states and 518 transitions. [2018-10-27 09:00:54,969 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 09:00:54,969 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 75 [2018-10-27 09:00:54,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:00:54,972 INFO L225 Difference]: With dead ends: 375 [2018-10-27 09:00:54,972 INFO L226 Difference]: Without dead ends: 245 [2018-10-27 09:00:54,974 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-27 09:00:54,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2018-10-27 09:00:54,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 176. [2018-10-27 09:00:54,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2018-10-27 09:00:54,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 236 transitions. [2018-10-27 09:00:54,996 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 236 transitions. Word has length 75 [2018-10-27 09:00:54,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:00:54,997 INFO L481 AbstractCegarLoop]: Abstraction has 176 states and 236 transitions. [2018-10-27 09:00:54,997 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 09:00:54,997 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 236 transitions. [2018-10-27 09:00:54,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-10-27 09:00:55,000 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:00:55,000 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:00:55,000 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:00:55,000 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:00:55,001 INFO L82 PathProgramCache]: Analyzing trace with hash -2053819268, now seen corresponding path program 4 times [2018-10-27 09:00:55,001 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:00:55,002 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:00:55,002 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:00:55,002 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:00:55,002 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:00:55,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:00:55,151 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-10-27 09:00:55,152 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:00:55,152 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:00:55,152 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:00:55,152 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:00:55,152 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:00:55,153 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 [2018-10-27 09:00:55,165 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:00:55,165 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:00:55,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:00:55,225 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:00:55,248 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-10-27 09:00:55,248 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:00:55,424 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-10-27 09:00:55,445 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:00:55,445 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-10-27 09:00:55,445 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:00:55,446 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 09:00:55,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 09:00:55,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-27 09:00:55,447 INFO L87 Difference]: Start difference. First operand 176 states and 236 transitions. Second operand 9 states. [2018-10-27 09:00:55,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:00:55,719 INFO L93 Difference]: Finished difference Result 424 states and 587 transitions. [2018-10-27 09:00:55,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 09:00:55,721 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 85 [2018-10-27 09:00:55,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:00:55,724 INFO L225 Difference]: With dead ends: 424 [2018-10-27 09:00:55,724 INFO L226 Difference]: Without dead ends: 271 [2018-10-27 09:00:55,725 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-27 09:00:55,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2018-10-27 09:00:55,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 202. [2018-10-27 09:00:55,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2018-10-27 09:00:55,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 272 transitions. [2018-10-27 09:00:55,749 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 272 transitions. Word has length 85 [2018-10-27 09:00:55,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:00:55,749 INFO L481 AbstractCegarLoop]: Abstraction has 202 states and 272 transitions. [2018-10-27 09:00:55,749 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 09:00:55,749 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 272 transitions. [2018-10-27 09:00:55,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-27 09:00:55,752 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:00:55,752 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 6, 6, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:00:55,752 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:00:55,753 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:00:55,753 INFO L82 PathProgramCache]: Analyzing trace with hash -1431295078, now seen corresponding path program 5 times [2018-10-27 09:00:55,753 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:00:55,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:00:55,754 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:00:55,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:00:55,754 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:00:55,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:00:55,982 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2018-10-27 09:00:55,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:00:55,983 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:00:55,983 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:00:55,983 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:00:55,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:00:55,984 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 [2018-10-27 09:00:55,992 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:00:55,992 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:00:56,062 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-27 09:00:56,062 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:00:56,073 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:00:56,250 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 47 proven. 11 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2018-10-27 09:00:56,250 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:00:56,590 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 47 proven. 11 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2018-10-27 09:00:56,622 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:00:56,623 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 21 [2018-10-27 09:00:56,623 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:00:56,623 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 09:00:56,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 09:00:56,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2018-10-27 09:00:56,624 INFO L87 Difference]: Start difference. First operand 202 states and 272 transitions. Second operand 15 states. [2018-10-27 09:00:57,360 WARN L179 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 12 DAG size of output: 10 [2018-10-27 09:00:59,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:00:59,257 INFO L93 Difference]: Finished difference Result 935 states and 1327 transitions. [2018-10-27 09:00:59,258 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-27 09:00:59,258 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 95 [2018-10-27 09:00:59,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:00:59,264 INFO L225 Difference]: With dead ends: 935 [2018-10-27 09:00:59,264 INFO L226 Difference]: Without dead ends: 756 [2018-10-27 09:00:59,266 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 203 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 567 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=725, Invalid=1927, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 09:00:59,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 756 states. [2018-10-27 09:00:59,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 756 to 246. [2018-10-27 09:00:59,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2018-10-27 09:00:59,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 336 transitions. [2018-10-27 09:00:59,304 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 336 transitions. Word has length 95 [2018-10-27 09:00:59,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:00:59,305 INFO L481 AbstractCegarLoop]: Abstraction has 246 states and 336 transitions. [2018-10-27 09:00:59,305 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 09:00:59,305 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 336 transitions. [2018-10-27 09:00:59,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-10-27 09:00:59,307 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:00:59,307 INFO L375 BasicCegarLoop]: trace histogram [10, 8, 8, 7, 7, 7, 7, 7, 7, 7, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:00:59,308 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:00:59,308 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:00:59,308 INFO L82 PathProgramCache]: Analyzing trace with hash 1239096169, now seen corresponding path program 6 times [2018-10-27 09:00:59,309 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:00:59,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:00:59,310 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:00:59,310 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:00:59,310 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:00:59,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:00:59,458 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 233 trivial. 0 not checked. [2018-10-27 09:00:59,459 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:00:59,459 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:00:59,459 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:00:59,459 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:00:59,459 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:00:59,459 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 [2018-10-27 09:00:59,473 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:00:59,474 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:00:59,558 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:00:59,558 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:00:59,561 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:00:59,593 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 233 trivial. 0 not checked. [2018-10-27 09:00:59,593 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:00:59,749 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 233 trivial. 0 not checked. [2018-10-27 09:00:59,770 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:00:59,770 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-10-27 09:00:59,770 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:00:59,771 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 09:00:59,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 09:00:59,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-27 09:00:59,771 INFO L87 Difference]: Start difference. First operand 246 states and 336 transitions. Second operand 11 states. [2018-10-27 09:01:00,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:01:00,579 INFO L93 Difference]: Finished difference Result 594 states and 837 transitions. [2018-10-27 09:01:00,587 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 09:01:00,587 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 115 [2018-10-27 09:01:00,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:01:00,591 INFO L225 Difference]: With dead ends: 594 [2018-10-27 09:01:00,591 INFO L226 Difference]: Without dead ends: 377 [2018-10-27 09:01:00,593 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 222 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-27 09:01:00,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2018-10-27 09:01:00,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 272. [2018-10-27 09:01:00,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2018-10-27 09:01:00,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 372 transitions. [2018-10-27 09:01:00,633 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 372 transitions. Word has length 115 [2018-10-27 09:01:00,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:01:00,634 INFO L481 AbstractCegarLoop]: Abstraction has 272 states and 372 transitions. [2018-10-27 09:01:00,634 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 09:01:00,634 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 372 transitions. [2018-10-27 09:01:00,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-27 09:01:00,637 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:01:00,637 INFO L375 BasicCegarLoop]: trace histogram [11, 9, 9, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:01:00,637 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:01:00,638 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:01:00,638 INFO L82 PathProgramCache]: Analyzing trace with hash -2041958265, now seen corresponding path program 7 times [2018-10-27 09:01:00,638 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:01:00,639 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:00,640 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:01:00,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:00,640 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:01:00,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:01:01,427 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2018-10-27 09:01:01,427 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:01,427 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:01:01,428 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:01:01,428 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:01:01,428 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:01,428 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 [2018-10-27 09:01:01,436 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:01:01,436 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:01:01,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:01:01,514 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:01:01,549 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2018-10-27 09:01:01,549 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:01:02,023 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2018-10-27 09:01:02,044 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:01:02,045 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-10-27 09:01:02,045 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:01:02,045 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 09:01:02,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 09:01:02,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-27 09:01:02,046 INFO L87 Difference]: Start difference. First operand 272 states and 372 transitions. Second operand 12 states. [2018-10-27 09:01:02,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:01:02,549 INFO L93 Difference]: Finished difference Result 643 states and 906 transitions. [2018-10-27 09:01:02,549 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 09:01:02,550 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 125 [2018-10-27 09:01:02,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:01:02,555 INFO L225 Difference]: With dead ends: 643 [2018-10-27 09:01:02,556 INFO L226 Difference]: Without dead ends: 403 [2018-10-27 09:01:02,559 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 241 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-27 09:01:02,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2018-10-27 09:01:02,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 298. [2018-10-27 09:01:02,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 298 states. [2018-10-27 09:01:02,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 408 transitions. [2018-10-27 09:01:02,596 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 408 transitions. Word has length 125 [2018-10-27 09:01:02,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:01:02,596 INFO L481 AbstractCegarLoop]: Abstraction has 298 states and 408 transitions. [2018-10-27 09:01:02,596 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 09:01:02,596 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 408 transitions. [2018-10-27 09:01:02,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-10-27 09:01:02,598 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:01:02,599 INFO L375 BasicCegarLoop]: trace histogram [12, 10, 10, 9, 9, 9, 9, 9, 9, 9, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:01:02,599 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:01:02,599 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:01:02,599 INFO L82 PathProgramCache]: Analyzing trace with hash 1943870825, now seen corresponding path program 8 times [2018-10-27 09:01:02,599 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:01:02,601 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:02,601 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:01:02,601 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:02,601 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:01:02,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:01:03,325 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 354 trivial. 0 not checked. [2018-10-27 09:01:03,325 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:03,325 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:01:03,325 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:01:03,325 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:01:03,326 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:03,326 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 [2018-10-27 09:01:03,334 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:01:03,335 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:01:03,398 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-27 09:01:03,398 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:01:03,402 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:01:03,562 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 90 proven. 27 refuted. 0 times theorem prover too weak. 363 trivial. 0 not checked. [2018-10-27 09:01:03,562 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:01:03,769 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 90 proven. 27 refuted. 0 times theorem prover too weak. 363 trivial. 0 not checked. [2018-10-27 09:01:03,790 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:01:03,791 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9, 9] total 26 [2018-10-27 09:01:03,791 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:01:03,791 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 09:01:03,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 09:01:03,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=523, Unknown=0, NotChecked=0, Total=650 [2018-10-27 09:01:03,792 INFO L87 Difference]: Start difference. First operand 298 states and 408 transitions. Second operand 19 states. [2018-10-27 09:01:07,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:01:07,195 INFO L93 Difference]: Finished difference Result 1540 states and 2202 transitions. [2018-10-27 09:01:07,195 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-10-27 09:01:07,196 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 135 [2018-10-27 09:01:07,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:01:07,204 INFO L225 Difference]: With dead ends: 1540 [2018-10-27 09:01:07,204 INFO L226 Difference]: Without dead ends: 1274 [2018-10-27 09:01:07,208 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 379 GetRequests, 301 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1667 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1773, Invalid=4547, Unknown=0, NotChecked=0, Total=6320 [2018-10-27 09:01:07,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1274 states. [2018-10-27 09:01:07,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1274 to 342. [2018-10-27 09:01:07,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 342 states. [2018-10-27 09:01:07,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 472 transitions. [2018-10-27 09:01:07,264 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 472 transitions. Word has length 135 [2018-10-27 09:01:07,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:01:07,265 INFO L481 AbstractCegarLoop]: Abstraction has 342 states and 472 transitions. [2018-10-27 09:01:07,265 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 09:01:07,265 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 472 transitions. [2018-10-27 09:01:07,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-10-27 09:01:07,267 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:01:07,268 INFO L375 BasicCegarLoop]: trace histogram [14, 11, 11, 10, 10, 10, 10, 10, 10, 10, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:01:07,268 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:01:07,268 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:01:07,268 INFO L82 PathProgramCache]: Analyzing trace with hash -168664780, now seen corresponding path program 9 times [2018-10-27 09:01:07,268 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:01:07,269 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:07,269 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:01:07,269 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:07,270 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:01:07,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:01:07,524 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 475 trivial. 0 not checked. [2018-10-27 09:01:07,524 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:07,524 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:01:07,524 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:01:07,524 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:01:07,524 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:07,525 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 [2018-10-27 09:01:07,541 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:01:07,541 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:01:07,621 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:01:07,621 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:01:07,625 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:01:07,646 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 475 trivial. 0 not checked. [2018-10-27 09:01:07,646 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:01:07,830 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 475 trivial. 0 not checked. [2018-10-27 09:01:07,850 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:01:07,851 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-10-27 09:01:07,851 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:01:07,851 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 09:01:07,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 09:01:07,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-27 09:01:07,852 INFO L87 Difference]: Start difference. First operand 342 states and 472 transitions. Second operand 14 states. [2018-10-27 09:01:08,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:01:08,148 INFO L93 Difference]: Finished difference Result 813 states and 1156 transitions. [2018-10-27 09:01:08,148 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 09:01:08,148 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 155 [2018-10-27 09:01:08,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:01:08,151 INFO L225 Difference]: With dead ends: 813 [2018-10-27 09:01:08,151 INFO L226 Difference]: Without dead ends: 509 [2018-10-27 09:01:08,153 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 299 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-27 09:01:08,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 509 states. [2018-10-27 09:01:08,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 509 to 368. [2018-10-27 09:01:08,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2018-10-27 09:01:08,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 508 transitions. [2018-10-27 09:01:08,201 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 508 transitions. Word has length 155 [2018-10-27 09:01:08,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:01:08,202 INFO L481 AbstractCegarLoop]: Abstraction has 368 states and 508 transitions. [2018-10-27 09:01:08,202 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 09:01:08,202 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 508 transitions. [2018-10-27 09:01:08,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-10-27 09:01:08,204 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:01:08,205 INFO L375 BasicCegarLoop]: trace histogram [15, 12, 12, 11, 11, 11, 11, 11, 11, 11, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:01:08,205 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:01:08,205 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:01:08,205 INFO L82 PathProgramCache]: Analyzing trace with hash 1485660182, now seen corresponding path program 10 times [2018-10-27 09:01:08,205 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:01:08,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:08,206 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:01:08,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:08,206 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:01:08,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:01:08,928 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2018-10-27 09:01:08,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:08,929 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:01:08,929 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:01:08,929 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:01:08,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:08,929 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 [2018-10-27 09:01:08,937 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:01:08,937 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:01:09,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:01:09,027 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:01:09,070 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2018-10-27 09:01:09,070 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:01:09,407 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2018-10-27 09:01:09,428 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:01:09,428 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-10-27 09:01:09,428 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:01:09,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 09:01:09,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 09:01:09,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-27 09:01:09,430 INFO L87 Difference]: Start difference. First operand 368 states and 508 transitions. Second operand 15 states. [2018-10-27 09:01:10,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:01:10,190 INFO L93 Difference]: Finished difference Result 862 states and 1225 transitions. [2018-10-27 09:01:10,190 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 09:01:10,191 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 165 [2018-10-27 09:01:10,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:01:10,194 INFO L225 Difference]: With dead ends: 862 [2018-10-27 09:01:10,195 INFO L226 Difference]: Without dead ends: 535 [2018-10-27 09:01:10,196 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 318 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-27 09:01:10,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2018-10-27 09:01:10,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 394. [2018-10-27 09:01:10,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 394 states. [2018-10-27 09:01:10,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 394 states to 394 states and 544 transitions. [2018-10-27 09:01:10,251 INFO L78 Accepts]: Start accepts. Automaton has 394 states and 544 transitions. Word has length 165 [2018-10-27 09:01:10,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:01:10,251 INFO L481 AbstractCegarLoop]: Abstraction has 394 states and 544 transitions. [2018-10-27 09:01:10,251 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 09:01:10,252 INFO L276 IsEmpty]: Start isEmpty. Operand 394 states and 544 transitions. [2018-10-27 09:01:10,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2018-10-27 09:01:10,254 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:01:10,255 INFO L375 BasicCegarLoop]: trace histogram [16, 13, 13, 12, 12, 12, 12, 12, 12, 12, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:01:10,255 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:01:10,255 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:01:10,255 INFO L82 PathProgramCache]: Analyzing trace with hash 1005051572, now seen corresponding path program 11 times [2018-10-27 09:01:10,255 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:01:10,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:10,256 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:01:10,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:10,257 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:01:10,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:01:10,500 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 642 trivial. 0 not checked. [2018-10-27 09:01:10,500 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:10,500 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:01:10,501 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:01:10,501 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:01:10,501 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:10,501 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 [2018-10-27 09:01:10,509 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:01:10,509 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:01:10,587 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 09:01:10,587 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:01:10,591 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:01:10,760 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 145 proven. 50 refuted. 0 times theorem prover too weak. 669 trivial. 0 not checked. [2018-10-27 09:01:10,760 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:01:11,175 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 145 proven. 50 refuted. 0 times theorem prover too weak. 669 trivial. 0 not checked. [2018-10-27 09:01:11,196 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:01:11,196 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10, 10] total 31 [2018-10-27 09:01:11,196 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:01:11,197 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 09:01:11,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 09:01:11,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=743, Unknown=0, NotChecked=0, Total=930 [2018-10-27 09:01:11,198 INFO L87 Difference]: Start difference. First operand 394 states and 544 transitions. Second operand 23 states. [2018-10-27 09:01:13,551 WARN L179 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 11 [2018-10-27 09:01:16,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:01:16,666 INFO L93 Difference]: Finished difference Result 2277 states and 3269 transitions. [2018-10-27 09:01:16,666 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2018-10-27 09:01:16,667 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 175 [2018-10-27 09:01:16,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:01:16,674 INFO L225 Difference]: With dead ends: 2277 [2018-10-27 09:01:16,674 INFO L226 Difference]: Without dead ends: 1924 [2018-10-27 09:01:16,679 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 405 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3904 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3647, Invalid=9235, Unknown=0, NotChecked=0, Total=12882 [2018-10-27 09:01:16,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1924 states. [2018-10-27 09:01:16,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1924 to 438. [2018-10-27 09:01:16,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 438 states. [2018-10-27 09:01:16,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 438 states to 438 states and 608 transitions. [2018-10-27 09:01:16,765 INFO L78 Accepts]: Start accepts. Automaton has 438 states and 608 transitions. Word has length 175 [2018-10-27 09:01:16,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:01:16,766 INFO L481 AbstractCegarLoop]: Abstraction has 438 states and 608 transitions. [2018-10-27 09:01:16,766 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 09:01:16,766 INFO L276 IsEmpty]: Start isEmpty. Operand 438 states and 608 transitions. [2018-10-27 09:01:16,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-10-27 09:01:16,769 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:01:16,769 INFO L375 BasicCegarLoop]: trace histogram [18, 14, 14, 13, 13, 13, 13, 13, 13, 13, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:01:16,770 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:01:16,770 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:01:16,770 INFO L82 PathProgramCache]: Analyzing trace with hash 1770266243, now seen corresponding path program 12 times [2018-10-27 09:01:16,770 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:01:16,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:16,771 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:01:16,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:16,771 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:01:16,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:01:17,670 INFO L134 CoverageAnalysis]: Checked inductivity of 1062 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 802 trivial. 0 not checked. [2018-10-27 09:01:17,670 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:17,670 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:01:17,670 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:01:17,671 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:01:17,671 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:17,671 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 [2018-10-27 09:01:17,679 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:01:17,679 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:01:17,785 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:01:17,785 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:01:17,789 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:01:17,831 INFO L134 CoverageAnalysis]: Checked inductivity of 1062 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 802 trivial. 0 not checked. [2018-10-27 09:01:17,831 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:01:18,103 INFO L134 CoverageAnalysis]: Checked inductivity of 1062 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 802 trivial. 0 not checked. [2018-10-27 09:01:18,124 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:01:18,124 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-10-27 09:01:18,124 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:01:18,125 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 09:01:18,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 09:01:18,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-27 09:01:18,125 INFO L87 Difference]: Start difference. First operand 438 states and 608 transitions. Second operand 17 states. [2018-10-27 09:01:18,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:01:18,945 INFO L93 Difference]: Finished difference Result 1032 states and 1475 transitions. [2018-10-27 09:01:18,945 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 09:01:18,945 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 195 [2018-10-27 09:01:18,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:01:18,949 INFO L225 Difference]: With dead ends: 1032 [2018-10-27 09:01:18,949 INFO L226 Difference]: Without dead ends: 641 [2018-10-27 09:01:18,951 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 376 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-27 09:01:18,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 641 states. [2018-10-27 09:01:19,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 641 to 464. [2018-10-27 09:01:19,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 464 states. [2018-10-27 09:01:19,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 644 transitions. [2018-10-27 09:01:19,035 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 644 transitions. Word has length 195 [2018-10-27 09:01:19,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:01:19,036 INFO L481 AbstractCegarLoop]: Abstraction has 464 states and 644 transitions. [2018-10-27 09:01:19,036 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 09:01:19,036 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 644 transitions. [2018-10-27 09:01:19,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2018-10-27 09:01:19,038 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:01:19,039 INFO L375 BasicCegarLoop]: trace histogram [19, 15, 15, 14, 14, 14, 14, 14, 14, 14, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:01:19,039 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:01:19,039 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:01:19,039 INFO L82 PathProgramCache]: Analyzing trace with hash -2012988639, now seen corresponding path program 13 times [2018-10-27 09:01:19,039 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:01:19,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:19,040 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:01:19,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:19,041 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:01:19,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:01:19,856 INFO L134 CoverageAnalysis]: Checked inductivity of 1206 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 905 trivial. 0 not checked. [2018-10-27 09:01:19,856 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:19,856 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:01:19,856 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:01:19,856 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:01:19,856 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:19,857 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 [2018-10-27 09:01:19,863 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:01:19,864 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:01:19,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:01:19,973 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:01:20,012 INFO L134 CoverageAnalysis]: Checked inductivity of 1206 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 905 trivial. 0 not checked. [2018-10-27 09:01:20,013 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:01:20,356 INFO L134 CoverageAnalysis]: Checked inductivity of 1206 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 905 trivial. 0 not checked. [2018-10-27 09:01:20,377 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:01:20,377 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-10-27 09:01:20,377 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:01:20,378 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 09:01:20,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 09:01:20,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 09:01:20,379 INFO L87 Difference]: Start difference. First operand 464 states and 644 transitions. Second operand 18 states. [2018-10-27 09:01:20,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:01:20,941 INFO L93 Difference]: Finished difference Result 1081 states and 1544 transitions. [2018-10-27 09:01:20,941 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 09:01:20,942 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 205 [2018-10-27 09:01:20,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:01:20,946 INFO L225 Difference]: With dead ends: 1081 [2018-10-27 09:01:20,946 INFO L226 Difference]: Without dead ends: 667 [2018-10-27 09:01:20,948 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 395 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 09:01:20,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 667 states. [2018-10-27 09:01:21,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 667 to 490. [2018-10-27 09:01:21,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 490 states. [2018-10-27 09:01:21,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 680 transitions. [2018-10-27 09:01:21,052 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 680 transitions. Word has length 205 [2018-10-27 09:01:21,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:01:21,052 INFO L481 AbstractCegarLoop]: Abstraction has 490 states and 680 transitions. [2018-10-27 09:01:21,053 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 09:01:21,053 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 680 transitions. [2018-10-27 09:01:21,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2018-10-27 09:01:21,055 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:01:21,056 INFO L375 BasicCegarLoop]: trace histogram [20, 16, 16, 15, 15, 15, 15, 15, 15, 15, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:01:21,056 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:01:21,056 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:01:21,056 INFO L82 PathProgramCache]: Analyzing trace with hash -1457442685, now seen corresponding path program 14 times [2018-10-27 09:01:21,056 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:01:21,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:21,057 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:01:21,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:21,058 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:01:21,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:01:21,609 INFO L134 CoverageAnalysis]: Checked inductivity of 1360 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 1015 trivial. 0 not checked. [2018-10-27 09:01:21,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:21,610 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:01:21,610 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:01:21,610 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:01:21,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:21,610 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 [2018-10-27 09:01:21,617 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:01:21,617 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:01:21,796 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-27 09:01:21,796 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:01:21,802 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:01:22,392 INFO L134 CoverageAnalysis]: Checked inductivity of 1360 backedges. 212 proven. 80 refuted. 0 times theorem prover too weak. 1068 trivial. 0 not checked. [2018-10-27 09:01:22,392 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:01:22,814 INFO L134 CoverageAnalysis]: Checked inductivity of 1360 backedges. 212 proven. 80 refuted. 0 times theorem prover too weak. 1068 trivial. 0 not checked. [2018-10-27 09:01:22,835 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:01:22,835 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 11, 11] total 36 [2018-10-27 09:01:22,835 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:01:22,836 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 09:01:22,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 09:01:22,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=1000, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 09:01:22,837 INFO L87 Difference]: Start difference. First operand 490 states and 680 transitions. Second operand 27 states. [2018-10-27 09:01:30,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:01:30,854 INFO L93 Difference]: Finished difference Result 3146 states and 4528 transitions. [2018-10-27 09:01:30,855 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 138 states. [2018-10-27 09:01:30,855 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 215 [2018-10-27 09:01:30,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:01:30,866 INFO L225 Difference]: With dead ends: 3146 [2018-10-27 09:01:30,867 INFO L226 Difference]: Without dead ends: 2706 [2018-10-27 09:01:30,876 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 667 GetRequests, 515 SyntacticMatches, 0 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8108 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=6680, Invalid=16882, Unknown=0, NotChecked=0, Total=23562 [2018-10-27 09:01:30,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2706 states. [2018-10-27 09:01:31,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2706 to 534. [2018-10-27 09:01:31,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 534 states. [2018-10-27 09:01:31,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 534 states to 534 states and 744 transitions. [2018-10-27 09:01:31,015 INFO L78 Accepts]: Start accepts. Automaton has 534 states and 744 transitions. Word has length 215 [2018-10-27 09:01:31,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:01:31,015 INFO L481 AbstractCegarLoop]: Abstraction has 534 states and 744 transitions. [2018-10-27 09:01:31,015 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 09:01:31,015 INFO L276 IsEmpty]: Start isEmpty. Operand 534 states and 744 transitions. [2018-10-27 09:01:31,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2018-10-27 09:01:31,018 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:01:31,018 INFO L375 BasicCegarLoop]: trace histogram [22, 17, 17, 16, 16, 16, 16, 16, 16, 16, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:01:31,018 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:01:31,019 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:01:31,019 INFO L82 PathProgramCache]: Analyzing trace with hash 202859342, now seen corresponding path program 15 times [2018-10-27 09:01:31,019 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:01:31,020 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:31,020 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:01:31,020 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:31,020 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:01:31,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:01:31,413 INFO L134 CoverageAnalysis]: Checked inductivity of 1606 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 1214 trivial. 0 not checked. [2018-10-27 09:01:31,414 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:31,414 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:01:31,414 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:01:31,414 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:01:31,414 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:31,414 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 [2018-10-27 09:01:31,422 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:01:31,422 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:01:31,539 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:01:31,539 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:01:31,544 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:01:31,692 INFO L134 CoverageAnalysis]: Checked inductivity of 1606 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 1214 trivial. 0 not checked. [2018-10-27 09:01:31,692 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:01:33,094 INFO L134 CoverageAnalysis]: Checked inductivity of 1606 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 1214 trivial. 0 not checked. [2018-10-27 09:01:33,115 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:01:33,115 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-10-27 09:01:33,115 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:01:33,116 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 09:01:33,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 09:01:33,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 09:01:33,117 INFO L87 Difference]: Start difference. First operand 534 states and 744 transitions. Second operand 20 states. [2018-10-27 09:01:34,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:01:34,132 INFO L93 Difference]: Finished difference Result 1251 states and 1794 transitions. [2018-10-27 09:01:34,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 09:01:34,136 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 235 [2018-10-27 09:01:34,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:01:34,140 INFO L225 Difference]: With dead ends: 1251 [2018-10-27 09:01:34,140 INFO L226 Difference]: Without dead ends: 773 [2018-10-27 09:01:34,143 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 453 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 09:01:34,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 773 states. [2018-10-27 09:01:34,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 773 to 560. [2018-10-27 09:01:34,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 560 states. [2018-10-27 09:01:34,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 560 states to 560 states and 780 transitions. [2018-10-27 09:01:34,289 INFO L78 Accepts]: Start accepts. Automaton has 560 states and 780 transitions. Word has length 235 [2018-10-27 09:01:34,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:01:34,290 INFO L481 AbstractCegarLoop]: Abstraction has 560 states and 780 transitions. [2018-10-27 09:01:34,290 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 09:01:34,290 INFO L276 IsEmpty]: Start isEmpty. Operand 560 states and 780 transitions. [2018-10-27 09:01:34,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2018-10-27 09:01:34,294 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:01:34,294 INFO L375 BasicCegarLoop]: trace histogram [23, 18, 18, 17, 17, 17, 17, 17, 17, 17, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:01:34,295 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:01:34,295 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:01:34,295 INFO L82 PathProgramCache]: Analyzing trace with hash 249227952, now seen corresponding path program 16 times [2018-10-27 09:01:34,295 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:01:34,296 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:34,296 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:01:34,296 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:34,296 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:01:34,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:01:35,819 INFO L134 CoverageAnalysis]: Checked inductivity of 1782 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 1340 trivial. 0 not checked. [2018-10-27 09:01:35,819 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:35,819 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:01:35,819 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:01:35,820 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:01:35,820 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:35,820 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 [2018-10-27 09:01:35,828 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:01:35,828 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:01:35,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:01:35,962 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:01:36,007 INFO L134 CoverageAnalysis]: Checked inductivity of 1782 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 1340 trivial. 0 not checked. [2018-10-27 09:01:36,007 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:01:36,540 INFO L134 CoverageAnalysis]: Checked inductivity of 1782 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 1340 trivial. 0 not checked. [2018-10-27 09:01:36,563 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:01:36,563 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-10-27 09:01:36,563 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:01:36,564 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 09:01:36,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 09:01:36,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 09:01:36,565 INFO L87 Difference]: Start difference. First operand 560 states and 780 transitions. Second operand 21 states. [2018-10-27 09:01:37,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:01:37,479 INFO L93 Difference]: Finished difference Result 1300 states and 1863 transitions. [2018-10-27 09:01:37,480 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 09:01:37,480 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 245 [2018-10-27 09:01:37,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:01:37,485 INFO L225 Difference]: With dead ends: 1300 [2018-10-27 09:01:37,485 INFO L226 Difference]: Without dead ends: 799 [2018-10-27 09:01:37,487 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 472 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 09:01:37,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 799 states. [2018-10-27 09:01:37,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 799 to 586. [2018-10-27 09:01:37,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 586 states. [2018-10-27 09:01:37,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 816 transitions. [2018-10-27 09:01:37,615 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 816 transitions. Word has length 245 [2018-10-27 09:01:37,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:01:37,615 INFO L481 AbstractCegarLoop]: Abstraction has 586 states and 816 transitions. [2018-10-27 09:01:37,615 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 09:01:37,615 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 816 transitions. [2018-10-27 09:01:37,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2018-10-27 09:01:37,618 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:01:37,618 INFO L375 BasicCegarLoop]: trace histogram [24, 19, 19, 18, 18, 18, 18, 18, 18, 18, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:01:37,619 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:01:37,619 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:01:37,619 INFO L82 PathProgramCache]: Analyzing trace with hash -1964715826, now seen corresponding path program 17 times [2018-10-27 09:01:37,619 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:01:37,620 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:37,620 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:01:37,620 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:37,620 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:01:37,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:01:38,396 INFO L134 CoverageAnalysis]: Checked inductivity of 1968 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 1473 trivial. 0 not checked. [2018-10-27 09:01:38,397 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:38,397 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:01:38,397 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:01:38,397 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:01:38,397 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:38,397 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 [2018-10-27 09:01:38,407 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:01:38,408 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:01:38,545 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-27 09:01:38,545 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:01:38,549 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:01:38,862 INFO L134 CoverageAnalysis]: Checked inductivity of 1968 backedges. 291 proven. 117 refuted. 0 times theorem prover too weak. 1560 trivial. 0 not checked. [2018-10-27 09:01:38,862 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:01:39,225 INFO L134 CoverageAnalysis]: Checked inductivity of 1968 backedges. 291 proven. 117 refuted. 0 times theorem prover too weak. 1560 trivial. 0 not checked. [2018-10-27 09:01:39,247 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:01:39,247 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 12, 12] total 41 [2018-10-27 09:01:39,247 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:01:39,248 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-27 09:01:39,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-27 09:01:39,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=346, Invalid=1294, Unknown=0, NotChecked=0, Total=1640 [2018-10-27 09:01:39,248 INFO L87 Difference]: Start difference. First operand 586 states and 816 transitions. Second operand 31 states. [2018-10-27 09:01:47,858 WARN L179 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 11 [2018-10-27 09:01:51,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:01:51,900 INFO L93 Difference]: Finished difference Result 4147 states and 5979 transitions. [2018-10-27 09:01:51,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 182 states. [2018-10-27 09:01:51,900 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 255 [2018-10-27 09:01:51,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:01:51,913 INFO L225 Difference]: With dead ends: 4147 [2018-10-27 09:01:51,913 INFO L226 Difference]: Without dead ends: 3620 [2018-10-27 09:01:51,918 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 829 GetRequests, 631 SyntacticMatches, 0 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14642 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=11259, Invalid=28541, Unknown=0, NotChecked=0, Total=39800 [2018-10-27 09:01:51,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3620 states. [2018-10-27 09:01:52,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3620 to 630. [2018-10-27 09:01:52,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 630 states. [2018-10-27 09:01:52,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 630 states to 630 states and 880 transitions. [2018-10-27 09:01:52,113 INFO L78 Accepts]: Start accepts. Automaton has 630 states and 880 transitions. Word has length 255 [2018-10-27 09:01:52,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:01:52,113 INFO L481 AbstractCegarLoop]: Abstraction has 630 states and 880 transitions. [2018-10-27 09:01:52,113 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-27 09:01:52,114 INFO L276 IsEmpty]: Start isEmpty. Operand 630 states and 880 transitions. [2018-10-27 09:01:52,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-10-27 09:01:52,116 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:01:52,117 INFO L375 BasicCegarLoop]: trace histogram [26, 20, 20, 19, 19, 19, 19, 19, 19, 19, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:01:52,117 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:01:52,117 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:01:52,117 INFO L82 PathProgramCache]: Analyzing trace with hash -1157906275, now seen corresponding path program 18 times [2018-10-27 09:01:52,118 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:01:52,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:52,118 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:01:52,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:52,119 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:01:52,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:01:53,589 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2018-10-27 09:01:53,590 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:53,590 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:01:53,590 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:01:53,590 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:01:53,590 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:53,590 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:01:53,599 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:01:53,599 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:01:53,741 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:01:53,742 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:01:53,747 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:01:53,821 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2018-10-27 09:01:53,821 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:01:54,512 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2018-10-27 09:01:54,534 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:01:54,535 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-10-27 09:01:54,535 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:01:54,535 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 09:01:54,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 09:01:54,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 09:01:54,536 INFO L87 Difference]: Start difference. First operand 630 states and 880 transitions. Second operand 23 states. [2018-10-27 09:01:55,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:01:55,531 INFO L93 Difference]: Finished difference Result 1470 states and 2113 transitions. [2018-10-27 09:01:55,534 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 09:01:55,534 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 275 [2018-10-27 09:01:55,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:01:55,538 INFO L225 Difference]: With dead ends: 1470 [2018-10-27 09:01:55,539 INFO L226 Difference]: Without dead ends: 905 [2018-10-27 09:01:55,540 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 530 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 09:01:55,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 905 states. [2018-10-27 09:01:55,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 905 to 656. [2018-10-27 09:01:55,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 656 states. [2018-10-27 09:01:55,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 656 states to 656 states and 916 transitions. [2018-10-27 09:01:55,690 INFO L78 Accepts]: Start accepts. Automaton has 656 states and 916 transitions. Word has length 275 [2018-10-27 09:01:55,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:01:55,690 INFO L481 AbstractCegarLoop]: Abstraction has 656 states and 916 transitions. [2018-10-27 09:01:55,690 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 09:01:55,691 INFO L276 IsEmpty]: Start isEmpty. Operand 656 states and 916 transitions. [2018-10-27 09:01:55,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2018-10-27 09:01:55,694 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:01:55,694 INFO L375 BasicCegarLoop]: trace histogram [27, 21, 21, 20, 20, 20, 20, 20, 20, 20, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:01:55,694 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:01:55,694 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:01:55,694 INFO L82 PathProgramCache]: Analyzing trace with hash -1671641925, now seen corresponding path program 19 times [2018-10-27 09:01:55,695 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:01:55,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:55,695 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:01:55,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:55,696 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:01:55,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:01:56,711 INFO L134 CoverageAnalysis]: Checked inductivity of 2470 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-27 09:01:56,711 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:56,712 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:01:56,712 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:01:56,712 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:01:56,712 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:56,712 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:01:56,719 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:01:56,719 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:01:56,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:01:56,873 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:01:56,931 INFO L134 CoverageAnalysis]: Checked inductivity of 2470 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-27 09:01:56,931 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:01:57,742 INFO L134 CoverageAnalysis]: Checked inductivity of 2470 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-27 09:01:57,763 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:01:57,764 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-10-27 09:01:57,764 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:01:57,765 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 09:01:57,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 09:01:57,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 09:01:57,766 INFO L87 Difference]: Start difference. First operand 656 states and 916 transitions. Second operand 24 states. [2018-10-27 09:01:58,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:01:58,681 INFO L93 Difference]: Finished difference Result 1519 states and 2182 transitions. [2018-10-27 09:01:58,681 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 09:01:58,681 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 285 [2018-10-27 09:01:58,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:01:58,685 INFO L225 Difference]: With dead ends: 1519 [2018-10-27 09:01:58,685 INFO L226 Difference]: Without dead ends: 931 [2018-10-27 09:01:58,686 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 549 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 09:01:58,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 931 states. [2018-10-27 09:01:58,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 931 to 682. [2018-10-27 09:01:58,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 682 states. [2018-10-27 09:01:58,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 682 states to 682 states and 952 transitions. [2018-10-27 09:01:58,839 INFO L78 Accepts]: Start accepts. Automaton has 682 states and 952 transitions. Word has length 285 [2018-10-27 09:01:58,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:01:58,839 INFO L481 AbstractCegarLoop]: Abstraction has 682 states and 952 transitions. [2018-10-27 09:01:58,839 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 09:01:58,839 INFO L276 IsEmpty]: Start isEmpty. Operand 682 states and 952 transitions. [2018-10-27 09:01:58,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 296 [2018-10-27 09:01:58,842 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:01:58,842 INFO L375 BasicCegarLoop]: trace histogram [28, 22, 22, 21, 21, 21, 21, 21, 21, 21, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:01:58,842 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:01:58,843 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:01:58,843 INFO L82 PathProgramCache]: Analyzing trace with hash -1483218275, now seen corresponding path program 20 times [2018-10-27 09:01:58,843 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:01:58,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:58,844 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:01:58,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:01:58,844 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:01:58,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:01:59,451 INFO L134 CoverageAnalysis]: Checked inductivity of 2688 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 2016 trivial. 0 not checked. [2018-10-27 09:01:59,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:59,451 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:01:59,452 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:01:59,452 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:01:59,452 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:01:59,452 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:01:59,462 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:01:59,463 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:01:59,620 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 09:01:59,620 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:01:59,626 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:01:59,953 INFO L134 CoverageAnalysis]: Checked inductivity of 2688 backedges. 382 proven. 161 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-27 09:01:59,954 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:02:00,461 INFO L134 CoverageAnalysis]: Checked inductivity of 2688 backedges. 382 proven. 161 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-27 09:02:00,483 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:02:00,483 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 13, 13] total 46 [2018-10-27 09:02:00,483 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:02:00,484 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-27 09:02:00,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-27 09:02:00,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=445, Invalid=1625, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 09:02:00,485 INFO L87 Difference]: Start difference. First operand 682 states and 952 transitions. Second operand 35 states. [2018-10-27 09:02:18,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:02:18,176 INFO L93 Difference]: Finished difference Result 5280 states and 7622 transitions. [2018-10-27 09:02:18,176 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 232 states. [2018-10-27 09:02:18,177 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 295 [2018-10-27 09:02:18,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:02:18,195 INFO L225 Difference]: With dead ends: 5280 [2018-10-27 09:02:18,196 INFO L226 Difference]: Without dead ends: 4666 [2018-10-27 09:02:18,202 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1003 GetRequests, 738 SyntacticMatches, 15 SemanticMatches, 250 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25982 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=17825, Invalid=45427, Unknown=0, NotChecked=0, Total=63252 [2018-10-27 09:02:18,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4666 states. [2018-10-27 09:02:18,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4666 to 726. [2018-10-27 09:02:18,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 726 states. [2018-10-27 09:02:18,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 726 states to 726 states and 1016 transitions. [2018-10-27 09:02:18,425 INFO L78 Accepts]: Start accepts. Automaton has 726 states and 1016 transitions. Word has length 295 [2018-10-27 09:02:18,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:02:18,426 INFO L481 AbstractCegarLoop]: Abstraction has 726 states and 1016 transitions. [2018-10-27 09:02:18,426 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-27 09:02:18,426 INFO L276 IsEmpty]: Start isEmpty. Operand 726 states and 1016 transitions. [2018-10-27 09:02:18,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 316 [2018-10-27 09:02:18,429 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:02:18,429 INFO L375 BasicCegarLoop]: trace histogram [30, 23, 23, 22, 22, 22, 22, 22, 22, 22, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:02:18,430 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:02:18,430 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:02:18,430 INFO L82 PathProgramCache]: Analyzing trace with hash 1730421864, now seen corresponding path program 21 times [2018-10-27 09:02:18,430 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:02:18,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:02:18,431 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:02:18,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:02:18,431 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:02:18,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:02:19,267 INFO L134 CoverageAnalysis]: Checked inductivity of 3030 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 2293 trivial. 0 not checked. [2018-10-27 09:02:19,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:02:19,267 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:02:19,268 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:02:19,268 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:02:19,268 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:02:19,268 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:02:19,276 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:02:19,276 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:02:19,440 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:02:19,441 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:02:19,447 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:02:19,542 INFO L134 CoverageAnalysis]: Checked inductivity of 3030 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 2293 trivial. 0 not checked. [2018-10-27 09:02:19,542 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:02:20,194 INFO L134 CoverageAnalysis]: Checked inductivity of 3030 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 2293 trivial. 0 not checked. [2018-10-27 09:02:20,216 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:02:20,216 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-10-27 09:02:20,216 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:02:20,217 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-27 09:02:20,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-27 09:02:20,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 09:02:20,218 INFO L87 Difference]: Start difference. First operand 726 states and 1016 transitions. Second operand 26 states. [2018-10-27 09:02:21,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:02:21,158 INFO L93 Difference]: Finished difference Result 1689 states and 2432 transitions. [2018-10-27 09:02:21,158 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 09:02:21,159 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 315 [2018-10-27 09:02:21,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:02:21,163 INFO L225 Difference]: With dead ends: 1689 [2018-10-27 09:02:21,164 INFO L226 Difference]: Without dead ends: 1037 [2018-10-27 09:02:21,165 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 654 GetRequests, 607 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 09:02:21,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1037 states. [2018-10-27 09:02:21,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1037 to 752. [2018-10-27 09:02:21,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 752 states. [2018-10-27 09:02:21,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 752 states to 752 states and 1052 transitions. [2018-10-27 09:02:21,383 INFO L78 Accepts]: Start accepts. Automaton has 752 states and 1052 transitions. Word has length 315 [2018-10-27 09:02:21,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:02:21,383 INFO L481 AbstractCegarLoop]: Abstraction has 752 states and 1052 transitions. [2018-10-27 09:02:21,384 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-27 09:02:21,384 INFO L276 IsEmpty]: Start isEmpty. Operand 752 states and 1052 transitions. [2018-10-27 09:02:21,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2018-10-27 09:02:21,387 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:02:21,387 INFO L375 BasicCegarLoop]: trace histogram [31, 24, 24, 23, 23, 23, 23, 23, 23, 23, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:02:21,387 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:02:21,388 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:02:21,388 INFO L82 PathProgramCache]: Analyzing trace with hash -1371253686, now seen corresponding path program 22 times [2018-10-27 09:02:21,388 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:02:21,389 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:02:21,389 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:02:21,389 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:02:21,389 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:02:21,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:02:21,932 INFO L134 CoverageAnalysis]: Checked inductivity of 3270 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 2465 trivial. 0 not checked. [2018-10-27 09:02:21,932 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:02:21,932 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:02:21,932 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:02:21,932 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:02:21,933 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:02:21,933 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:02:21,941 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:02:21,941 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:02:22,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:02:22,121 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:02:22,231 INFO L134 CoverageAnalysis]: Checked inductivity of 3270 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 2465 trivial. 0 not checked. [2018-10-27 09:02:22,231 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:02:23,161 INFO L134 CoverageAnalysis]: Checked inductivity of 3270 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 2465 trivial. 0 not checked. [2018-10-27 09:02:23,182 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:02:23,182 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-10-27 09:02:23,182 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:02:23,183 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 09:02:23,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 09:02:23,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 09:02:23,184 INFO L87 Difference]: Start difference. First operand 752 states and 1052 transitions. Second operand 27 states. [2018-10-27 09:02:24,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:02:24,228 INFO L93 Difference]: Finished difference Result 1738 states and 2501 transitions. [2018-10-27 09:02:24,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 09:02:24,229 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 325 [2018-10-27 09:02:24,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:02:24,235 INFO L225 Difference]: With dead ends: 1738 [2018-10-27 09:02:24,235 INFO L226 Difference]: Without dead ends: 1063 [2018-10-27 09:02:24,237 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 675 GetRequests, 626 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 09:02:24,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1063 states. [2018-10-27 09:02:24,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1063 to 778. [2018-10-27 09:02:24,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 778 states. [2018-10-27 09:02:24,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 778 states to 778 states and 1088 transitions. [2018-10-27 09:02:24,459 INFO L78 Accepts]: Start accepts. Automaton has 778 states and 1088 transitions. Word has length 325 [2018-10-27 09:02:24,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:02:24,459 INFO L481 AbstractCegarLoop]: Abstraction has 778 states and 1088 transitions. [2018-10-27 09:02:24,459 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 09:02:24,459 INFO L276 IsEmpty]: Start isEmpty. Operand 778 states and 1088 transitions. [2018-10-27 09:02:24,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2018-10-27 09:02:24,462 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:02:24,463 INFO L375 BasicCegarLoop]: trace histogram [32, 25, 25, 24, 24, 24, 24, 24, 24, 24, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:02:24,463 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:02:24,463 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:02:24,463 INFO L82 PathProgramCache]: Analyzing trace with hash 686129640, now seen corresponding path program 23 times [2018-10-27 09:02:24,463 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:02:24,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:02:24,464 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:02:24,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:02:24,464 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:02:24,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:02:25,068 INFO L134 CoverageAnalysis]: Checked inductivity of 3520 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 2644 trivial. 0 not checked. [2018-10-27 09:02:25,069 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:02:25,069 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:02:25,069 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:02:25,069 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:02:25,069 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:02:25,069 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:02:25,077 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:02:25,077 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:02:25,287 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-27 09:02:25,287 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:02:25,294 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:02:25,592 INFO L134 CoverageAnalysis]: Checked inductivity of 3520 backedges. 485 proven. 212 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-10-27 09:02:25,592 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:02:26,979 WARN L179 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2018-10-27 09:02:27,428 INFO L134 CoverageAnalysis]: Checked inductivity of 3520 backedges. 485 proven. 212 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-10-27 09:02:27,449 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:02:27,450 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 14, 14] total 51 [2018-10-27 09:02:27,450 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:02:27,450 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 09:02:27,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 09:02:27,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=557, Invalid=1993, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 09:02:27,451 INFO L87 Difference]: Start difference. First operand 778 states and 1088 transitions. Second operand 39 states. [2018-10-27 09:02:51,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:02:51,718 INFO L93 Difference]: Finished difference Result 6545 states and 9457 transitions. [2018-10-27 09:02:51,718 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 288 states. [2018-10-27 09:02:51,718 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 335 [2018-10-27 09:02:51,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:02:51,733 INFO L225 Difference]: With dead ends: 6545 [2018-10-27 09:02:51,733 INFO L226 Difference]: Without dead ends: 5844 [2018-10-27 09:02:51,741 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1189 GetRequests, 881 SyntacticMatches, 0 SemanticMatches, 308 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40665 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=26873, Invalid=68917, Unknown=0, NotChecked=0, Total=95790 [2018-10-27 09:02:51,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5844 states. [2018-10-27 09:02:52,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5844 to 822. [2018-10-27 09:02:52,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 822 states. [2018-10-27 09:02:52,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 822 states to 822 states and 1152 transitions. [2018-10-27 09:02:52,036 INFO L78 Accepts]: Start accepts. Automaton has 822 states and 1152 transitions. Word has length 335 [2018-10-27 09:02:52,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:02:52,037 INFO L481 AbstractCegarLoop]: Abstraction has 822 states and 1152 transitions. [2018-10-27 09:02:52,037 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 09:02:52,037 INFO L276 IsEmpty]: Start isEmpty. Operand 822 states and 1152 transitions. [2018-10-27 09:02:52,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 356 [2018-10-27 09:02:52,040 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:02:52,041 INFO L375 BasicCegarLoop]: trace histogram [34, 26, 26, 25, 25, 25, 25, 25, 25, 25, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:02:52,041 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:02:52,041 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:02:52,041 INFO L82 PathProgramCache]: Analyzing trace with hash 115900855, now seen corresponding path program 24 times [2018-10-27 09:02:52,041 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:02:52,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:02:52,042 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:02:52,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:02:52,042 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:02:52,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:02:52,857 INFO L134 CoverageAnalysis]: Checked inductivity of 3910 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 2960 trivial. 0 not checked. [2018-10-27 09:02:52,857 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:02:52,858 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:02:52,858 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:02:52,858 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:02:52,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:02:52,858 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:02:52,872 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:02:52,872 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:02:53,050 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:02:53,050 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:02:53,058 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:02:53,178 INFO L134 CoverageAnalysis]: Checked inductivity of 3910 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 2960 trivial. 0 not checked. [2018-10-27 09:02:53,178 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:02:54,359 INFO L134 CoverageAnalysis]: Checked inductivity of 3910 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 2960 trivial. 0 not checked. [2018-10-27 09:02:54,382 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:02:54,382 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-10-27 09:02:54,382 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:02:54,383 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-27 09:02:54,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-27 09:02:54,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 09:02:54,384 INFO L87 Difference]: Start difference. First operand 822 states and 1152 transitions. Second operand 29 states. [2018-10-27 09:02:55,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:02:55,636 INFO L93 Difference]: Finished difference Result 1908 states and 2751 transitions. [2018-10-27 09:02:55,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 09:02:55,636 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 355 [2018-10-27 09:02:55,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:02:55,640 INFO L225 Difference]: With dead ends: 1908 [2018-10-27 09:02:55,640 INFO L226 Difference]: Without dead ends: 1169 [2018-10-27 09:02:55,642 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 737 GetRequests, 684 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 09:02:55,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1169 states. [2018-10-27 09:02:55,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1169 to 848. [2018-10-27 09:02:55,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 848 states. [2018-10-27 09:02:55,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 848 states to 848 states and 1188 transitions. [2018-10-27 09:02:55,993 INFO L78 Accepts]: Start accepts. Automaton has 848 states and 1188 transitions. Word has length 355 [2018-10-27 09:02:55,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:02:55,993 INFO L481 AbstractCegarLoop]: Abstraction has 848 states and 1188 transitions. [2018-10-27 09:02:55,993 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-27 09:02:55,993 INFO L276 IsEmpty]: Start isEmpty. Operand 848 states and 1188 transitions. [2018-10-27 09:02:55,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2018-10-27 09:02:55,996 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:02:55,996 INFO L375 BasicCegarLoop]: trace histogram [35, 27, 27, 26, 26, 26, 26, 26, 26, 26, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:02:55,996 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:02:55,996 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:02:55,996 INFO L82 PathProgramCache]: Analyzing trace with hash 796020053, now seen corresponding path program 25 times [2018-10-27 09:02:55,996 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:02:55,997 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:02:55,997 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:02:55,997 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:02:55,997 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:02:56,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:02:56,853 INFO L134 CoverageAnalysis]: Checked inductivity of 4182 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 3155 trivial. 0 not checked. [2018-10-27 09:02:56,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:02:56,854 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:02:56,854 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:02:56,854 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:02:56,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:02:56,854 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:02:56,864 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:02:56,865 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:02:57,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:02:57,060 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:02:57,141 INFO L134 CoverageAnalysis]: Checked inductivity of 4182 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 3155 trivial. 0 not checked. [2018-10-27 09:02:57,142 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:02:58,019 INFO L134 CoverageAnalysis]: Checked inductivity of 4182 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 3155 trivial. 0 not checked. [2018-10-27 09:02:58,040 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:02:58,041 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-10-27 09:02:58,041 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:02:58,041 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-27 09:02:58,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-27 09:02:58,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 09:02:58,042 INFO L87 Difference]: Start difference. First operand 848 states and 1188 transitions. Second operand 30 states. [2018-10-27 09:02:59,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:02:59,242 INFO L93 Difference]: Finished difference Result 1957 states and 2820 transitions. [2018-10-27 09:02:59,242 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-27 09:02:59,242 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 365 [2018-10-27 09:02:59,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:02:59,246 INFO L225 Difference]: With dead ends: 1957 [2018-10-27 09:02:59,246 INFO L226 Difference]: Without dead ends: 1195 [2018-10-27 09:02:59,248 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 758 GetRequests, 703 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 09:02:59,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1195 states. [2018-10-27 09:02:59,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1195 to 874. [2018-10-27 09:02:59,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 874 states. [2018-10-27 09:02:59,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 874 states to 874 states and 1224 transitions. [2018-10-27 09:02:59,706 INFO L78 Accepts]: Start accepts. Automaton has 874 states and 1224 transitions. Word has length 365 [2018-10-27 09:02:59,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:02:59,706 INFO L481 AbstractCegarLoop]: Abstraction has 874 states and 1224 transitions. [2018-10-27 09:02:59,706 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-27 09:02:59,706 INFO L276 IsEmpty]: Start isEmpty. Operand 874 states and 1224 transitions. [2018-10-27 09:02:59,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 376 [2018-10-27 09:02:59,714 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:02:59,714 INFO L375 BasicCegarLoop]: trace histogram [36, 28, 28, 27, 27, 27, 27, 27, 27, 27, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:02:59,714 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:02:59,714 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:02:59,715 INFO L82 PathProgramCache]: Analyzing trace with hash -521686089, now seen corresponding path program 26 times [2018-10-27 09:02:59,715 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:02:59,715 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:02:59,716 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:02:59,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:02:59,716 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:02:59,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:03:00,541 INFO L134 CoverageAnalysis]: Checked inductivity of 4464 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 3357 trivial. 0 not checked. [2018-10-27 09:03:00,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:03:00,541 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:03:00,541 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:03:00,542 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:03:00,542 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:03:00,542 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:03:00,549 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:03:00,550 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:03:00,891 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-27 09:03:00,892 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:03:00,897 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:03:01,530 INFO L134 CoverageAnalysis]: Checked inductivity of 4464 backedges. 600 proven. 270 refuted. 0 times theorem prover too weak. 3594 trivial. 0 not checked. [2018-10-27 09:03:01,530 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:03:02,247 INFO L134 CoverageAnalysis]: Checked inductivity of 4464 backedges. 600 proven. 270 refuted. 0 times theorem prover too weak. 3594 trivial. 0 not checked. [2018-10-27 09:03:02,269 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:03:02,270 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 15, 15] total 56 [2018-10-27 09:03:02,270 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:03:02,270 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-27 09:03:02,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-27 09:03:02,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=682, Invalid=2398, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 09:03:02,271 INFO L87 Difference]: Start difference. First operand 874 states and 1224 transitions. Second operand 43 states. [2018-10-27 09:03:36,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:03:36,893 INFO L93 Difference]: Finished difference Result 7942 states and 11484 transitions. [2018-10-27 09:03:36,894 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 350 states. [2018-10-27 09:03:36,894 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 375 [2018-10-27 09:03:36,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:03:36,912 INFO L225 Difference]: With dead ends: 7942 [2018-10-27 09:03:36,912 INFO L226 Difference]: Without dead ends: 7154 [2018-10-27 09:03:36,925 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1387 GetRequests, 1015 SyntacticMatches, 0 SemanticMatches, 372 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62504 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=38952, Invalid=100550, Unknown=0, NotChecked=0, Total=139502 [2018-10-27 09:03:36,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7154 states. [2018-10-27 09:03:37,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7154 to 918. [2018-10-27 09:03:37,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 918 states. [2018-10-27 09:03:37,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 918 states to 918 states and 1288 transitions. [2018-10-27 09:03:37,536 INFO L78 Accepts]: Start accepts. Automaton has 918 states and 1288 transitions. Word has length 375 [2018-10-27 09:03:37,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:03:37,536 INFO L481 AbstractCegarLoop]: Abstraction has 918 states and 1288 transitions. [2018-10-27 09:03:37,536 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-27 09:03:37,536 INFO L276 IsEmpty]: Start isEmpty. Operand 918 states and 1288 transitions. [2018-10-27 09:03:37,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 396 [2018-10-27 09:03:37,540 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:03:37,541 INFO L375 BasicCegarLoop]: trace histogram [38, 29, 29, 28, 28, 28, 28, 28, 28, 28, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:03:37,541 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:03:37,541 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:03:37,541 INFO L82 PathProgramCache]: Analyzing trace with hash 907486338, now seen corresponding path program 27 times [2018-10-27 09:03:37,542 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:03:37,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:03:37,542 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:03:37,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:03:37,543 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:03:37,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:03:38,146 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 3712 trivial. 0 not checked. [2018-10-27 09:03:38,147 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:03:38,147 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:03:38,147 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:03:38,147 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:03:38,147 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:03:38,147 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:03:38,156 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:03:38,156 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:03:38,372 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:03:38,373 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:03:38,380 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:03:38,483 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 3712 trivial. 0 not checked. [2018-10-27 09:03:38,483 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:03:40,534 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 3712 trivial. 0 not checked. [2018-10-27 09:03:40,558 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:03:40,558 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-10-27 09:03:40,558 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:03:40,559 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-27 09:03:40,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-27 09:03:40,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 09:03:40,560 INFO L87 Difference]: Start difference. First operand 918 states and 1288 transitions. Second operand 32 states. [2018-10-27 09:03:42,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:03:42,127 INFO L93 Difference]: Finished difference Result 2127 states and 3070 transitions. [2018-10-27 09:03:42,127 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-27 09:03:42,127 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 395 [2018-10-27 09:03:42,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:03:42,130 INFO L225 Difference]: With dead ends: 2127 [2018-10-27 09:03:42,130 INFO L226 Difference]: Without dead ends: 1301 [2018-10-27 09:03:42,133 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 820 GetRequests, 761 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 09:03:42,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1301 states. [2018-10-27 09:03:42,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1301 to 944. [2018-10-27 09:03:42,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 944 states. [2018-10-27 09:03:42,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 944 states to 944 states and 1324 transitions. [2018-10-27 09:03:42,632 INFO L78 Accepts]: Start accepts. Automaton has 944 states and 1324 transitions. Word has length 395 [2018-10-27 09:03:42,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:03:42,632 INFO L481 AbstractCegarLoop]: Abstraction has 944 states and 1324 transitions. [2018-10-27 09:03:42,632 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-27 09:03:42,632 INFO L276 IsEmpty]: Start isEmpty. Operand 944 states and 1324 transitions. [2018-10-27 09:03:42,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 406 [2018-10-27 09:03:42,635 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:03:42,635 INFO L375 BasicCegarLoop]: trace histogram [39, 30, 30, 29, 29, 29, 29, 29, 29, 29, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:03:42,636 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:03:42,636 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:03:42,636 INFO L82 PathProgramCache]: Analyzing trace with hash 1397759204, now seen corresponding path program 28 times [2018-10-27 09:03:42,636 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:03:42,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:03:42,637 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:03:42,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:03:42,637 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:03:42,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:03:43,382 INFO L134 CoverageAnalysis]: Checked inductivity of 5206 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 3930 trivial. 0 not checked. [2018-10-27 09:03:43,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:03:43,382 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:03:43,382 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:03:43,382 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:03:43,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:03:43,383 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:03:43,391 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:03:43,391 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:03:43,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:03:43,614 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:03:43,692 INFO L134 CoverageAnalysis]: Checked inductivity of 5206 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 3930 trivial. 0 not checked. [2018-10-27 09:03:43,693 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:03:45,206 INFO L134 CoverageAnalysis]: Checked inductivity of 5206 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 3930 trivial. 0 not checked. [2018-10-27 09:03:45,228 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:03:45,228 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2018-10-27 09:03:45,228 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:03:45,229 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-27 09:03:45,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-27 09:03:45,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-27 09:03:45,230 INFO L87 Difference]: Start difference. First operand 944 states and 1324 transitions. Second operand 33 states. [2018-10-27 09:03:46,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:03:46,780 INFO L93 Difference]: Finished difference Result 2176 states and 3139 transitions. [2018-10-27 09:03:46,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 09:03:46,780 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 405 [2018-10-27 09:03:46,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:03:46,784 INFO L225 Difference]: With dead ends: 2176 [2018-10-27 09:03:46,784 INFO L226 Difference]: Without dead ends: 1327 [2018-10-27 09:03:46,787 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 841 GetRequests, 780 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-27 09:03:46,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1327 states. [2018-10-27 09:03:47,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1327 to 970. [2018-10-27 09:03:47,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 970 states. [2018-10-27 09:03:47,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 970 states to 970 states and 1360 transitions. [2018-10-27 09:03:47,191 INFO L78 Accepts]: Start accepts. Automaton has 970 states and 1360 transitions. Word has length 405 [2018-10-27 09:03:47,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:03:47,192 INFO L481 AbstractCegarLoop]: Abstraction has 970 states and 1360 transitions. [2018-10-27 09:03:47,192 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-27 09:03:47,192 INFO L276 IsEmpty]: Start isEmpty. Operand 970 states and 1360 transitions. [2018-10-27 09:03:47,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 416 [2018-10-27 09:03:47,196 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:03:47,196 INFO L375 BasicCegarLoop]: trace histogram [40, 31, 31, 30, 30, 30, 30, 30, 30, 30, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:03:47,196 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:03:47,196 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:03:47,197 INFO L82 PathProgramCache]: Analyzing trace with hash 2078831106, now seen corresponding path program 29 times [2018-10-27 09:03:47,197 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:03:47,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:03:47,197 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:03:47,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:03:47,198 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:03:47,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:03:47,863 INFO L134 CoverageAnalysis]: Checked inductivity of 5520 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 4155 trivial. 0 not checked. [2018-10-27 09:03:47,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:03:47,863 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:03:47,863 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:03:47,863 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:03:47,864 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:03:47,864 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:03:47,872 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:03:47,872 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:03:48,202 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 09:03:48,203 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:03:48,209 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:03:48,787 INFO L134 CoverageAnalysis]: Checked inductivity of 5520 backedges. 727 proven. 335 refuted. 0 times theorem prover too weak. 4458 trivial. 0 not checked. [2018-10-27 09:03:48,787 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:03:49,643 INFO L134 CoverageAnalysis]: Checked inductivity of 5520 backedges. 727 proven. 335 refuted. 0 times theorem prover too weak. 4458 trivial. 0 not checked. [2018-10-27 09:03:49,666 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:03:49,666 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 16, 16] total 61 [2018-10-27 09:03:49,667 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:03:49,667 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-27 09:03:49,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-27 09:03:49,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=820, Invalid=2840, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 09:03:49,668 INFO L87 Difference]: Start difference. First operand 970 states and 1360 transitions. Second operand 47 states. [2018-10-27 09:04:21,760 WARN L179 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 11 [2018-10-27 09:04:38,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:04:38,962 INFO L93 Difference]: Finished difference Result 9471 states and 13703 transitions. [2018-10-27 09:04:38,962 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 418 states. [2018-10-27 09:04:38,962 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 415 [2018-10-27 09:04:38,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:04:38,975 INFO L225 Difference]: With dead ends: 9471 [2018-10-27 09:04:38,975 INFO L226 Difference]: Without dead ends: 8596 [2018-10-27 09:04:38,986 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1597 GetRequests, 1155 SyntacticMatches, 0 SemanticMatches, 442 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91735 ImplicationChecksByTransitivity, 22.0s TimeCoverageRelationStatistics Valid=54665, Invalid=142027, Unknown=0, NotChecked=0, Total=196692 [2018-10-27 09:04:38,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8596 states. [2018-10-27 09:04:39,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8596 to 1014. [2018-10-27 09:04:39,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1014 states. [2018-10-27 09:04:39,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1014 states to 1014 states and 1424 transitions. [2018-10-27 09:04:39,746 INFO L78 Accepts]: Start accepts. Automaton has 1014 states and 1424 transitions. Word has length 415 [2018-10-27 09:04:39,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:04:39,746 INFO L481 AbstractCegarLoop]: Abstraction has 1014 states and 1424 transitions. [2018-10-27 09:04:39,746 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-27 09:04:39,746 INFO L276 IsEmpty]: Start isEmpty. Operand 1014 states and 1424 transitions. [2018-10-27 09:04:39,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 436 [2018-10-27 09:04:39,749 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:04:39,750 INFO L375 BasicCegarLoop]: trace histogram [42, 32, 32, 31, 31, 31, 31, 31, 31, 31, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:04:39,750 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:04:39,750 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:04:39,750 INFO L82 PathProgramCache]: Analyzing trace with hash -55516719, now seen corresponding path program 30 times [2018-10-27 09:04:39,750 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:04:39,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:04:39,751 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:04:39,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:04:39,751 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:04:39,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:04:40,446 INFO L134 CoverageAnalysis]: Checked inductivity of 6006 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 4549 trivial. 0 not checked. [2018-10-27 09:04:40,447 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:04:40,447 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:04:40,447 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:04:40,447 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:04:40,447 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:04:40,447 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:04:40,454 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:04:40,455 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:04:40,688 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:04:40,688 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:04:40,696 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:04:40,953 INFO L134 CoverageAnalysis]: Checked inductivity of 6006 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 4549 trivial. 0 not checked. [2018-10-27 09:04:40,953 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:04:42,317 INFO L134 CoverageAnalysis]: Checked inductivity of 6006 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 4549 trivial. 0 not checked. [2018-10-27 09:04:42,339 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:04:42,340 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2018-10-27 09:04:42,340 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:04:42,340 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-27 09:04:42,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-27 09:04:42,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 09:04:42,341 INFO L87 Difference]: Start difference. First operand 1014 states and 1424 transitions. Second operand 35 states. [2018-10-27 09:04:44,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:04:44,324 INFO L93 Difference]: Finished difference Result 2346 states and 3389 transitions. [2018-10-27 09:04:44,324 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-27 09:04:44,324 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 435 [2018-10-27 09:04:44,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:04:44,326 INFO L225 Difference]: With dead ends: 2346 [2018-10-27 09:04:44,327 INFO L226 Difference]: Without dead ends: 1433 [2018-10-27 09:04:44,329 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 903 GetRequests, 838 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 09:04:44,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1433 states. [2018-10-27 09:04:44,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1433 to 1040. [2018-10-27 09:04:44,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1040 states. [2018-10-27 09:04:44,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1040 states to 1040 states and 1460 transitions. [2018-10-27 09:04:44,799 INFO L78 Accepts]: Start accepts. Automaton has 1040 states and 1460 transitions. Word has length 435 [2018-10-27 09:04:44,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:04:44,799 INFO L481 AbstractCegarLoop]: Abstraction has 1040 states and 1460 transitions. [2018-10-27 09:04:44,799 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-27 09:04:44,799 INFO L276 IsEmpty]: Start isEmpty. Operand 1040 states and 1460 transitions. [2018-10-27 09:04:44,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 446 [2018-10-27 09:04:44,803 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:04:44,803 INFO L375 BasicCegarLoop]: trace histogram [43, 33, 33, 32, 32, 32, 32, 32, 32, 32, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:04:44,803 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:04:44,803 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:04:44,803 INFO L82 PathProgramCache]: Analyzing trace with hash 1378047215, now seen corresponding path program 31 times [2018-10-27 09:04:44,803 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:04:44,804 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:04:44,804 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:04:44,804 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:04:44,804 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:04:44,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Received shutdown request... [2018-10-27 09:04:45,155 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-27 09:04:45,161 WARN L205 ceAbstractionStarter]: Timeout [2018-10-27 09:04:45,162 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 09:04:45 BoogieIcfgContainer [2018-10-27 09:04:45,162 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-27 09:04:45,163 INFO L168 Benchmark]: Toolchain (without parser) took 237903.86 ms. Allocated memory was 1.5 GB in the beginning and 4.1 GB in the end (delta: 2.6 GB). Free memory was 1.4 GB in the beginning and 2.7 GB in the end (delta: -1.2 GB). Peak memory consumption was 1.3 GB. Max. memory is 7.1 GB. [2018-10-27 09:04:45,164 INFO L168 Benchmark]: CDTParser took 0.19 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. [2018-10-27 09:04:45,164 INFO L168 Benchmark]: CACSL2BoogieTranslator took 419.50 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. [2018-10-27 09:04:45,165 INFO L168 Benchmark]: Boogie Procedure Inliner took 71.68 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. [2018-10-27 09:04:45,165 INFO L168 Benchmark]: Boogie Preprocessor took 47.09 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. [2018-10-27 09:04:45,165 INFO L168 Benchmark]: RCFGBuilder took 764.01 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 748.7 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -788.4 MB). Peak memory consumption was 16.3 MB. Max. memory is 7.1 GB. [2018-10-27 09:04:45,167 INFO L168 Benchmark]: TraceAbstraction took 236596.36 ms. Allocated memory was 2.3 GB in the beginning and 4.1 GB in the end (delta: 1.8 GB). Free memory was 2.2 GB in the beginning and 2.7 GB in the end (delta: -469.5 MB). Peak memory consumption was 1.3 GB. Max. memory is 7.1 GB. [2018-10-27 09:04:45,171 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 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 419.50 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 71.68 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 Preprocessor took 47.09 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 764.01 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 748.7 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -788.4 MB). Peak memory consumption was 16.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 236596.36 ms. Allocated memory was 2.3 GB in the beginning and 4.1 GB in the end (delta: 1.8 GB). Free memory was 2.2 GB in the beginning and 2.7 GB in the end (delta: -469.5 MB). Peak memory consumption was 1.3 GB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 4]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 4). Cancelled while BasicCegarLoop was analyzing trace of length 446 with TraceHistMax 43,while InterpolatingTraceCheckCraig was constructing Craig interpolants,while PredicateComparison was comparing new predicate (quantifier-free) to 5 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 7 procedures, 55 locations, 1 error locations. TIMEOUT Result, 236.5s OverallTime, 35 OverallIterations, 43 TraceHistogramMax, 178.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 7651 SDtfs, 83254 SDslu, 43604 SDs, 0 SdLazy, 53445 SolverSat, 27979 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 55.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 18063 GetRequests, 15322 SyntacticMatches, 15 SemanticMatches, 2726 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251246 ImplicationChecksByTransitivity, 105.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=1040occurred in iteration=34, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.6s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 6.1s AutomataMinimizationTime, 34 MinimizatonAttempts, 35436 StatesRemovedByMinimization, 33 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.9s SsaConstructionTime, 4.4s SatisfiabilityAnalysisTime, 43.2s InterpolantComputationTime, 14448 NumberOfCodeBlocks, 13438 NumberOfCodeBlocksAsserted, 142 NumberOfCheckSat, 21560 ConstructedInterpolants, 0 QuantifiedInterpolants, 11573048 SizeOfPredicates, 63 NumberOfNonLiveVariables, 24168 ConjunctsInSsa, 526 ConjunctsInUnsatCore, 98 InterpolantComputations, 4 PerfectInterpolantSequences, 153553/193146 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown