java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/up_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:16:25,185 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:16:25,187 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:16:25,203 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:16:25,204 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:16:25,205 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:16:25,207 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:16:25,209 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:16:25,212 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:16:25,213 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:16:25,213 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:16:25,215 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:16:25,216 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:16:25,217 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:16:25,224 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:16:25,225 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:16:25,226 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:16:25,230 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:16:25,234 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:16:25,236 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:16:25,239 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:16:25,240 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:16:25,244 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:16:25,244 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:16:25,244 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:16:25,245 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:16:25,246 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:16:25,247 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:16:25,250 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:16:25,251 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:16:25,251 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:16:25,252 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-24 12:16:25,252 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-24 12:16:25,252 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-24 12:16:25,255 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-24 12:16:25,255 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-24 12:16:25,256 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-24 12:16:25,285 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:16:25,285 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:16:25,287 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:16:25,287 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:16:25,287 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:16:25,287 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:16:25,288 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:16:25,288 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:16:25,288 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:16:25,288 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:16:25,288 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:16:25,289 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:16:25,290 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:16:25,290 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:16:25,290 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:16:25,290 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:16:25,290 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:16:25,291 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:16:25,292 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:16:25,292 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:16:25,293 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:16:25,293 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:16:25,293 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:16:25,293 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:16:25,293 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:16:25,294 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:16:25,294 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:16:25,294 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:16:25,294 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:16:25,295 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:16:25,295 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:16:25,295 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:16:25,295 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:16:25,295 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:16:25,362 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:16:25,378 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:16:25,383 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:16:25,384 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:16:25,385 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:16:25,386 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-invgen/up_true-unreach-call_true-termination.i [2018-10-24 12:16:25,459 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/50b51b965/92102551e24045929ed0236c471d9783/FLAG700649cf2 [2018-10-24 12:16:25,895 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:16:25,895 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/up_true-unreach-call_true-termination.i [2018-10-24 12:16:25,901 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/50b51b965/92102551e24045929ed0236c471d9783/FLAG700649cf2 [2018-10-24 12:16:25,919 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/50b51b965/92102551e24045929ed0236c471d9783 [2018-10-24 12:16:25,932 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:16:25,933 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:16:25,934 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:16:25,935 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:16:25,941 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:16:25,942 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:16:25" (1/1) ... [2018-10-24 12:16:25,944 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@63879a50 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:25, skipping insertion in model container [2018-10-24 12:16:25,945 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:16:25" (1/1) ... [2018-10-24 12:16:25,955 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:16:25,979 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:16:26,155 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:16:26,159 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:16:26,177 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:16:26,196 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:16:26,197 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:26 WrapperNode [2018-10-24 12:16:26,197 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:16:26,198 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:16:26,198 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:16:26,198 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:16:26,209 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:26" (1/1) ... [2018-10-24 12:16:26,215 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:26" (1/1) ... [2018-10-24 12:16:26,222 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:16:26,223 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:16:26,223 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:16:26,223 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:16:26,233 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:26" (1/1) ... [2018-10-24 12:16:26,234 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:26" (1/1) ... [2018-10-24 12:16:26,234 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:26" (1/1) ... [2018-10-24 12:16:26,235 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:26" (1/1) ... [2018-10-24 12:16:26,242 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:26" (1/1) ... [2018-10-24 12:16:26,250 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:26" (1/1) ... [2018-10-24 12:16:26,253 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:26" (1/1) ... [2018-10-24 12:16:26,256 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:16:26,257 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:16:26,257 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:16:26,257 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:16:26,258 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:26" (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 [2018-10-24 12:16:26,326 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:16:26,326 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:16:26,327 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:16:26,327 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:16:26,327 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:16:26,327 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:16:26,327 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:16:26,327 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:16:26,724 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:16:26,725 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:16:26 BoogieIcfgContainer [2018-10-24 12:16:26,725 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:16:26,726 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:16:26,726 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:16:26,738 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:16:26,738 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:16:25" (1/3) ... [2018-10-24 12:16:26,742 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7deab4f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:16:26, skipping insertion in model container [2018-10-24 12:16:26,742 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:26" (2/3) ... [2018-10-24 12:16:26,743 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7deab4f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:16:26, skipping insertion in model container [2018-10-24 12:16:26,743 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:16:26" (3/3) ... [2018-10-24 12:16:26,747 INFO L112 eAbstractionObserver]: Analyzing ICFG up_true-unreach-call_true-termination.i [2018-10-24 12:16:26,768 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:16:26,776 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:16:26,798 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:16:26,830 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:16:26,830 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:16:26,830 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:16:26,830 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:16:26,830 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:16:26,831 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:16:26,831 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:16:26,831 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:16:26,849 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-10-24 12:16:26,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 12:16:26,855 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:26,856 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:26,859 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:26,865 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:26,865 INFO L82 PathProgramCache]: Analyzing trace with hash -1884544245, now seen corresponding path program 1 times [2018-10-24 12:16:26,867 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:26,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:26,914 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:26,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:26,914 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:26,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:26,971 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:26,973 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:16:26,974 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:16:26,974 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:16:26,978 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:16:26,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:16:26,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:16:26,997 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2018-10-24 12:16:27,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:27,020 INFO L93 Difference]: Finished difference Result 37 states and 44 transitions. [2018-10-24 12:16:27,020 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:16:27,021 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-10-24 12:16:27,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:27,030 INFO L225 Difference]: With dead ends: 37 [2018-10-24 12:16:27,031 INFO L226 Difference]: Without dead ends: 18 [2018-10-24 12:16:27,035 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 [2018-10-24 12:16:27,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-24 12:16:27,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-24 12:16:27,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 12:16:27,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-10-24 12:16:27,076 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-10-24 12:16:27,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:27,077 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-10-24 12:16:27,077 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:16:27,077 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-10-24 12:16:27,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-24 12:16:27,078 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:27,078 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:27,079 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:27,079 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:27,079 INFO L82 PathProgramCache]: Analyzing trace with hash 1969781111, now seen corresponding path program 1 times [2018-10-24 12:16:27,079 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:27,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:27,080 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:27,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:27,081 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:27,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:27,175 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:27,175 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:16:27,175 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-24 12:16:27,175 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:16:27,177 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:16:27,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:16:27,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 12:16:27,178 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 5 states. [2018-10-24 12:16:27,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:27,300 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2018-10-24 12:16:27,300 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:16:27,300 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2018-10-24 12:16:27,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:27,301 INFO L225 Difference]: With dead ends: 33 [2018-10-24 12:16:27,302 INFO L226 Difference]: Without dead ends: 20 [2018-10-24 12:16:27,303 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:16:27,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-24 12:16:27,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-24 12:16:27,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-24 12:16:27,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2018-10-24 12:16:27,309 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 14 [2018-10-24 12:16:27,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:27,309 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2018-10-24 12:16:27,309 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:16:27,310 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2018-10-24 12:16:27,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-24 12:16:27,310 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:27,311 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:27,311 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:27,311 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:27,311 INFO L82 PathProgramCache]: Analyzing trace with hash -1960344783, now seen corresponding path program 1 times [2018-10-24 12:16:27,312 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:27,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:27,313 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:27,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:27,313 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:27,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:27,446 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:27,446 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:16:27,447 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-10-24 12:16:27,447 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:16:27,447 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:16:27,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:16:27,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:16:27,449 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 6 states. [2018-10-24 12:16:27,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:27,590 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2018-10-24 12:16:27,590 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:16:27,593 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2018-10-24 12:16:27,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:27,595 INFO L225 Difference]: With dead ends: 34 [2018-10-24 12:16:27,596 INFO L226 Difference]: Without dead ends: 32 [2018-10-24 12:16:27,596 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:16:27,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-24 12:16:27,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 27. [2018-10-24 12:16:27,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-24 12:16:27,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-10-24 12:16:27,617 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 16 [2018-10-24 12:16:27,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:27,619 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-10-24 12:16:27,619 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:16:27,619 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-10-24 12:16:27,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-24 12:16:27,620 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:27,621 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:27,621 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:27,621 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:27,621 INFO L82 PathProgramCache]: Analyzing trace with hash -1864992939, now seen corresponding path program 1 times [2018-10-24 12:16:27,621 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:27,622 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:27,623 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:27,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:27,623 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:27,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:27,910 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:27,910 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:27,910 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:27,911 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-10-24 12:16:27,913 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [18], [22], [28], [30], [35], [38], [40], [43], [45], [46], [47], [48], [50], [51] [2018-10-24 12:16:27,957 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:16:27,958 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:16:28,426 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:16:28,428 INFO L272 AbstractInterpreter]: Visited 19 different actions 195 times. Merged at 8 different actions 83 times. Widened at 3 different actions 15 times. Found 8 fixpoints after 2 different actions. Largest state had 9 variables. [2018-10-24 12:16:28,460 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:28,462 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:16:28,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:28,462 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 [2018-10-24 12:16:28,476 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:28,476 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:28,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:28,512 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:28,608 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:28,608 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:28,673 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:28,696 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:28,697 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2018-10-24 12:16:28,697 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:28,697 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:16:28,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:16:28,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:16:28,698 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2018-10-24 12:16:28,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:28,934 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2018-10-24 12:16:28,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:16:28,934 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2018-10-24 12:16:28,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:28,936 INFO L225 Difference]: With dead ends: 46 [2018-10-24 12:16:28,937 INFO L226 Difference]: Without dead ends: 29 [2018-10-24 12:16:28,938 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 43 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:16:28,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-24 12:16:28,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-10-24 12:16:28,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-24 12:16:28,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2018-10-24 12:16:28,945 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 24 [2018-10-24 12:16:28,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:28,945 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2018-10-24 12:16:28,945 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:16:28,946 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2018-10-24 12:16:28,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-24 12:16:28,947 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:28,947 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:28,947 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:28,947 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:28,948 INFO L82 PathProgramCache]: Analyzing trace with hash -62381937, now seen corresponding path program 2 times [2018-10-24 12:16:28,948 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:28,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:28,949 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:28,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:28,949 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:28,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:29,065 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:29,065 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:29,065 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:29,065 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:29,066 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:29,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:29,066 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 [2018-10-24 12:16:29,082 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:29,082 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:29,106 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:16:29,106 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:29,109 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:29,235 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:29,235 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:29,597 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:29,619 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:29,619 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 10 [2018-10-24 12:16:29,619 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:29,620 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:16:29,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:16:29,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:16:29,621 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 10 states. [2018-10-24 12:16:29,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:29,786 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2018-10-24 12:16:29,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:16:29,787 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2018-10-24 12:16:29,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:29,789 INFO L225 Difference]: With dead ends: 39 [2018-10-24 12:16:29,789 INFO L226 Difference]: Without dead ends: 37 [2018-10-24 12:16:29,790 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 49 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:16:29,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-24 12:16:29,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-10-24 12:16:29,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-24 12:16:29,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2018-10-24 12:16:29,796 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 26 [2018-10-24 12:16:29,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:29,797 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2018-10-24 12:16:29,797 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:16:29,797 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2018-10-24 12:16:29,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-24 12:16:29,798 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:29,799 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:29,799 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:29,799 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:29,799 INFO L82 PathProgramCache]: Analyzing trace with hash 1261098675, now seen corresponding path program 3 times [2018-10-24 12:16:29,799 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:29,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:29,801 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:29,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:29,801 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:29,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:29,976 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:16:29,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:29,976 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:29,976 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:29,977 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:29,977 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:29,977 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 [2018-10-24 12:16:29,992 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:29,992 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:30,008 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:30,009 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:30,012 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:30,129 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:16:30,130 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:30,261 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:16:30,283 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:30,283 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 12 [2018-10-24 12:16:30,283 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:30,284 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:16:30,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:16:30,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:16:30,285 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 12 states. [2018-10-24 12:16:30,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:30,435 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2018-10-24 12:16:30,437 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:16:30,437 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2018-10-24 12:16:30,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:30,438 INFO L225 Difference]: With dead ends: 60 [2018-10-24 12:16:30,438 INFO L226 Difference]: Without dead ends: 39 [2018-10-24 12:16:30,439 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 60 SyntacticMatches, 6 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=73, Invalid=167, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:16:30,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-24 12:16:30,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-10-24 12:16:30,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-24 12:16:30,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-10-24 12:16:30,445 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 34 [2018-10-24 12:16:30,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:30,446 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-10-24 12:16:30,446 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:16:30,446 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-10-24 12:16:30,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-24 12:16:30,447 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:30,447 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:30,448 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:30,448 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:30,448 INFO L82 PathProgramCache]: Analyzing trace with hash -1825718419, now seen corresponding path program 4 times [2018-10-24 12:16:30,448 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:30,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:30,449 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:30,450 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:30,450 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:30,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:30,591 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 15 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-24 12:16:30,591 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:30,591 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:30,592 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:30,592 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:30,592 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:30,592 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 [2018-10-24 12:16:30,601 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:30,601 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:30,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:30,631 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:30,685 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:16:30,686 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:30,754 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:16:30,774 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:30,774 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 11 [2018-10-24 12:16:30,775 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:30,775 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:16:30,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:16:30,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:16:30,776 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 11 states. [2018-10-24 12:16:30,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:30,943 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-10-24 12:16:30,943 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:16:30,943 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 36 [2018-10-24 12:16:30,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:30,945 INFO L225 Difference]: With dead ends: 49 [2018-10-24 12:16:30,945 INFO L226 Difference]: Without dead ends: 47 [2018-10-24 12:16:30,945 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 7 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:16:30,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-10-24 12:16:30,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-10-24 12:16:30,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-24 12:16:30,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2018-10-24 12:16:30,952 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 36 [2018-10-24 12:16:30,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:30,953 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2018-10-24 12:16:30,953 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:16:30,953 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2018-10-24 12:16:30,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-24 12:16:30,954 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:30,954 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:30,954 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:30,954 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:30,954 INFO L82 PathProgramCache]: Analyzing trace with hash -51726447, now seen corresponding path program 5 times [2018-10-24 12:16:30,955 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:30,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:30,956 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:30,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:30,956 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:30,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:31,111 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:16:31,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:31,112 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:31,112 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:31,112 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:31,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:31,113 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 [2018-10-24 12:16:31,120 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:31,121 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:31,138 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 12:16:31,138 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:31,143 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:31,407 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:16:31,407 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:31,501 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:16:31,522 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:31,522 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 15 [2018-10-24 12:16:31,522 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:31,523 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:16:31,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:16:31,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:16:31,525 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 15 states. [2018-10-24 12:16:31,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:31,713 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2018-10-24 12:16:31,714 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:16:31,714 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2018-10-24 12:16:31,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:31,715 INFO L225 Difference]: With dead ends: 74 [2018-10-24 12:16:31,715 INFO L226 Difference]: Without dead ends: 49 [2018-10-24 12:16:31,717 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 77 SyntacticMatches, 8 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=271, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:16:31,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-24 12:16:31,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-10-24 12:16:31,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-10-24 12:16:31,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2018-10-24 12:16:31,724 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 44 [2018-10-24 12:16:31,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:31,725 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2018-10-24 12:16:31,725 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:16:31,725 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2018-10-24 12:16:31,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-24 12:16:31,726 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:31,726 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:31,727 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:31,727 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:31,727 INFO L82 PathProgramCache]: Analyzing trace with hash 446005195, now seen corresponding path program 6 times [2018-10-24 12:16:31,727 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:31,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:31,728 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:31,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:31,728 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:31,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:31,849 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 25 proven. 28 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-24 12:16:31,849 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:31,849 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:31,849 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:31,850 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:31,850 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:31,850 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 [2018-10-24 12:16:31,857 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:31,857 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:31,879 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:31,879 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:31,882 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:31,970 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:16:31,970 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:32,060 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:16:32,081 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:32,081 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 12 [2018-10-24 12:16:32,081 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:32,081 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:16:32,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:16:32,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:16:32,082 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 12 states. [2018-10-24 12:16:32,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:32,344 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2018-10-24 12:16:32,344 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:16:32,345 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 46 [2018-10-24 12:16:32,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:32,347 INFO L225 Difference]: With dead ends: 59 [2018-10-24 12:16:32,347 INFO L226 Difference]: Without dead ends: 57 [2018-10-24 12:16:32,347 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 87 SyntacticMatches, 9 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:16:32,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-24 12:16:32,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-10-24 12:16:32,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-24 12:16:32,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-10-24 12:16:32,354 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 46 [2018-10-24 12:16:32,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:32,354 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-10-24 12:16:32,354 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:16:32,354 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-10-24 12:16:32,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-10-24 12:16:32,356 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:32,356 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:32,357 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:32,357 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:32,357 INFO L82 PathProgramCache]: Analyzing trace with hash -239912465, now seen corresponding path program 7 times [2018-10-24 12:16:32,357 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:32,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:32,358 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:32,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:32,358 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:32,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:32,503 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:32,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:32,504 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:32,504 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:32,504 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:32,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:32,504 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 [2018-10-24 12:16:32,514 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:32,515 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:32,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:32,539 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:32,736 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:32,736 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:32,991 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:33,023 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:33,023 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 18 [2018-10-24 12:16:33,023 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:33,024 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:16:33,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:16:33,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:16:33,028 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 18 states. [2018-10-24 12:16:33,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:33,298 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2018-10-24 12:16:33,298 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:16:33,299 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 54 [2018-10-24 12:16:33,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:33,300 INFO L225 Difference]: With dead ends: 88 [2018-10-24 12:16:33,300 INFO L226 Difference]: Without dead ends: 59 [2018-10-24 12:16:33,301 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 94 SyntacticMatches, 10 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=152, Invalid=400, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:16:33,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-10-24 12:16:33,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-10-24 12:16:33,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-24 12:16:33,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2018-10-24 12:16:33,309 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 54 [2018-10-24 12:16:33,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:33,309 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2018-10-24 12:16:33,309 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:16:33,309 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2018-10-24 12:16:33,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-24 12:16:33,311 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:33,311 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:33,311 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:33,311 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:33,312 INFO L82 PathProgramCache]: Analyzing trace with hash -363560535, now seen corresponding path program 8 times [2018-10-24 12:16:33,312 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:33,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:33,313 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:33,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:33,313 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:33,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:33,550 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 37 proven. 46 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:16:33,550 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:33,550 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:33,550 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:33,551 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:33,551 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:33,551 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 [2018-10-24 12:16:33,563 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:33,564 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:33,585 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:16:33,585 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:33,590 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:33,641 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:33,642 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:33,803 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:33,824 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:33,824 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 13 [2018-10-24 12:16:33,824 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:33,825 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:16:33,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:16:33,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:16:33,825 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand 13 states. [2018-10-24 12:16:33,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:33,973 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2018-10-24 12:16:33,973 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:16:33,973 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 56 [2018-10-24 12:16:33,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:33,975 INFO L225 Difference]: With dead ends: 69 [2018-10-24 12:16:33,975 INFO L226 Difference]: Without dead ends: 67 [2018-10-24 12:16:33,976 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 106 SyntacticMatches, 11 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:16:33,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-24 12:16:33,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-10-24 12:16:33,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-10-24 12:16:33,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2018-10-24 12:16:33,984 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 56 [2018-10-24 12:16:33,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:33,984 INFO L481 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2018-10-24 12:16:33,984 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:16:33,985 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2018-10-24 12:16:33,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-24 12:16:33,986 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:33,986 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:33,986 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:33,986 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:33,987 INFO L82 PathProgramCache]: Analyzing trace with hash 1782152653, now seen corresponding path program 9 times [2018-10-24 12:16:33,987 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:33,988 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:33,988 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:33,988 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:33,988 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:33,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:34,466 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:34,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:34,466 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:34,466 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:34,467 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:34,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:34,467 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 [2018-10-24 12:16:34,490 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:34,490 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:34,517 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:34,518 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:34,521 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:34,772 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:34,772 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:34,866 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:34,887 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:34,887 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 21 [2018-10-24 12:16:34,887 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:34,887 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:16:34,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:16:34,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:16:34,889 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 21 states. [2018-10-24 12:16:35,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:35,429 INFO L93 Difference]: Finished difference Result 102 states and 109 transitions. [2018-10-24 12:16:35,430 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:16:35,430 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 64 [2018-10-24 12:16:35,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:35,431 INFO L225 Difference]: With dead ends: 102 [2018-10-24 12:16:35,431 INFO L226 Difference]: Without dead ends: 69 [2018-10-24 12:16:35,432 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 111 SyntacticMatches, 12 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=202, Invalid=554, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:16:35,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-24 12:16:35,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-10-24 12:16:35,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-24 12:16:35,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-10-24 12:16:35,448 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 64 [2018-10-24 12:16:35,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:35,448 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-10-24 12:16:35,448 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:16:35,448 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-10-24 12:16:35,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-10-24 12:16:35,449 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:35,450 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:35,450 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:35,450 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:35,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1767367943, now seen corresponding path program 10 times [2018-10-24 12:16:35,450 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:35,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:35,455 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:35,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:35,455 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:35,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:35,671 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 51 proven. 68 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-24 12:16:35,671 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:35,672 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:35,672 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:35,672 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:35,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:35,672 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 [2018-10-24 12:16:35,680 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:35,680 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:35,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:35,701 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:35,785 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:35,785 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:35,997 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:36,018 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:36,018 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 14 [2018-10-24 12:16:36,018 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:36,018 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:16:36,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:16:36,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:16:36,019 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 14 states. [2018-10-24 12:16:36,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:36,236 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-10-24 12:16:36,237 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:16:36,237 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 66 [2018-10-24 12:16:36,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:36,238 INFO L225 Difference]: With dead ends: 79 [2018-10-24 12:16:36,239 INFO L226 Difference]: Without dead ends: 77 [2018-10-24 12:16:36,239 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 125 SyntacticMatches, 13 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:16:36,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-10-24 12:16:36,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2018-10-24 12:16:36,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-24 12:16:36,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2018-10-24 12:16:36,247 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 66 [2018-10-24 12:16:36,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:36,247 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2018-10-24 12:16:36,248 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:16:36,248 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2018-10-24 12:16:36,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-24 12:16:36,249 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:36,249 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:36,249 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:36,249 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:36,250 INFO L82 PathProgramCache]: Analyzing trace with hash 508207915, now seen corresponding path program 11 times [2018-10-24 12:16:36,250 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:36,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:36,251 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:36,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:36,251 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:36,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:36,478 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:36,479 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:36,479 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:36,479 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:36,479 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:36,479 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:36,479 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 [2018-10-24 12:16:36,486 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:36,486 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:36,551 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-24 12:16:36,551 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:36,554 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:36,921 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:36,921 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:37,136 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:37,156 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:37,156 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 24 [2018-10-24 12:16:37,157 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:37,157 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:16:37,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:16:37,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=409, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:16:37,158 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand 24 states. [2018-10-24 12:16:37,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:37,413 INFO L93 Difference]: Finished difference Result 116 states and 124 transitions. [2018-10-24 12:16:37,413 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:16:37,414 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 74 [2018-10-24 12:16:37,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:37,415 INFO L225 Difference]: With dead ends: 116 [2018-10-24 12:16:37,415 INFO L226 Difference]: Without dead ends: 79 [2018-10-24 12:16:37,416 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 128 SyntacticMatches, 14 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=259, Invalid=733, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:16:37,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-24 12:16:37,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-10-24 12:16:37,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-24 12:16:37,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-10-24 12:16:37,424 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 74 [2018-10-24 12:16:37,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:37,424 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-10-24 12:16:37,425 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:16:37,425 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-10-24 12:16:37,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-24 12:16:37,426 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:37,426 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:37,426 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:37,426 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:37,427 INFO L82 PathProgramCache]: Analyzing trace with hash 262457829, now seen corresponding path program 12 times [2018-10-24 12:16:37,427 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:37,427 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:37,428 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:37,428 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:37,428 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:37,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:37,606 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 67 proven. 94 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-24 12:16:37,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:37,606 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:37,607 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:37,607 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:37,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:37,607 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 [2018-10-24 12:16:37,614 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:37,614 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:37,635 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:37,635 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:37,638 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:37,684 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:37,684 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:37,770 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:37,791 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:37,791 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 15 [2018-10-24 12:16:37,791 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:37,791 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:16:37,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:16:37,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:16:37,792 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 15 states. [2018-10-24 12:16:37,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:37,979 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2018-10-24 12:16:37,980 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:16:37,980 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 76 [2018-10-24 12:16:37,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:37,984 INFO L225 Difference]: With dead ends: 89 [2018-10-24 12:16:37,984 INFO L226 Difference]: Without dead ends: 87 [2018-10-24 12:16:37,985 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 144 SyntacticMatches, 15 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:16:37,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-24 12:16:37,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-10-24 12:16:37,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-10-24 12:16:37,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-10-24 12:16:37,996 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 76 [2018-10-24 12:16:37,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:37,996 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-10-24 12:16:37,996 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:16:37,996 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-10-24 12:16:37,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-10-24 12:16:37,997 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:37,998 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:37,998 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:37,998 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:37,998 INFO L82 PathProgramCache]: Analyzing trace with hash 1053542921, now seen corresponding path program 13 times [2018-10-24 12:16:37,998 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:37,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:37,999 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:37,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:37,999 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:38,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:38,233 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:16:38,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:38,233 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:38,233 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:38,233 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:38,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:38,234 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 [2018-10-24 12:16:38,242 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:38,242 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:38,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:38,265 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:38,448 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:16:38,448 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:38,595 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:16:38,615 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:38,615 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 27 [2018-10-24 12:16:38,615 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:38,616 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:16:38,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:16:38,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=523, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:16:38,617 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 27 states. [2018-10-24 12:16:38,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:38,807 INFO L93 Difference]: Finished difference Result 130 states and 139 transitions. [2018-10-24 12:16:38,808 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:16:38,808 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 84 [2018-10-24 12:16:38,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:38,809 INFO L225 Difference]: With dead ends: 130 [2018-10-24 12:16:38,809 INFO L226 Difference]: Without dead ends: 89 [2018-10-24 12:16:38,810 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 145 SyntacticMatches, 16 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 415 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=937, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:16:38,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-10-24 12:16:38,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2018-10-24 12:16:38,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-24 12:16:38,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 90 transitions. [2018-10-24 12:16:38,818 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 90 transitions. Word has length 84 [2018-10-24 12:16:38,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:38,818 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 90 transitions. [2018-10-24 12:16:38,818 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:16:38,818 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 90 transitions. [2018-10-24 12:16:38,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-10-24 12:16:38,819 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:38,819 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:38,820 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:38,820 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:38,820 INFO L82 PathProgramCache]: Analyzing trace with hash -396865469, now seen corresponding path program 14 times [2018-10-24 12:16:38,820 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:38,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:38,821 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:38,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:38,821 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:38,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:39,599 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 85 proven. 124 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-24 12:16:39,599 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:39,599 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:39,599 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:39,599 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:39,599 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:39,599 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 [2018-10-24 12:16:39,608 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:39,608 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:39,647 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:16:39,648 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:39,650 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:39,697 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:16:39,697 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:39,903 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:16:39,923 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:39,924 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 16 [2018-10-24 12:16:39,924 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:39,924 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:16:39,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:16:39,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:16:39,925 INFO L87 Difference]: Start difference. First operand 89 states and 90 transitions. Second operand 16 states. [2018-10-24 12:16:40,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:40,127 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2018-10-24 12:16:40,127 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:16:40,127 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 86 [2018-10-24 12:16:40,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:40,129 INFO L225 Difference]: With dead ends: 99 [2018-10-24 12:16:40,129 INFO L226 Difference]: Without dead ends: 97 [2018-10-24 12:16:40,130 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 163 SyntacticMatches, 17 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:16:40,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-10-24 12:16:40,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-10-24 12:16:40,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-10-24 12:16:40,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-10-24 12:16:40,138 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 86 [2018-10-24 12:16:40,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:40,138 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-10-24 12:16:40,138 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:16:40,138 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-10-24 12:16:40,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-10-24 12:16:40,139 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:40,140 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:40,140 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:40,140 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:40,140 INFO L82 PathProgramCache]: Analyzing trace with hash -138800537, now seen corresponding path program 15 times [2018-10-24 12:16:40,140 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:40,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:40,141 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:40,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:40,142 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:40,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:40,410 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:16:40,410 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:40,410 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:40,411 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:40,411 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:40,411 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:40,411 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 [2018-10-24 12:16:40,433 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:40,434 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:40,459 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:40,460 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:40,462 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:40,658 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:16:40,658 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:40,866 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:16:40,887 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:40,887 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 30 [2018-10-24 12:16:40,887 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:40,888 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:16:40,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:16:40,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=651, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:16:40,889 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 30 states. [2018-10-24 12:16:41,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:41,170 INFO L93 Difference]: Finished difference Result 144 states and 154 transitions. [2018-10-24 12:16:41,171 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:16:41,172 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 94 [2018-10-24 12:16:41,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:41,173 INFO L225 Difference]: With dead ends: 144 [2018-10-24 12:16:41,174 INFO L226 Difference]: Without dead ends: 99 [2018-10-24 12:16:41,175 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 162 SyntacticMatches, 18 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=394, Invalid=1166, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:16:41,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-10-24 12:16:41,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2018-10-24 12:16:41,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-24 12:16:41,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2018-10-24 12:16:41,182 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 94 [2018-10-24 12:16:41,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:41,182 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2018-10-24 12:16:41,182 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:16:41,182 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2018-10-24 12:16:41,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-24 12:16:41,183 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:41,183 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:41,183 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:41,184 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:41,184 INFO L82 PathProgramCache]: Analyzing trace with hash -1817733087, now seen corresponding path program 16 times [2018-10-24 12:16:41,184 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:41,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:41,185 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:41,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:41,185 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:41,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:41,470 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 105 proven. 158 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-24 12:16:41,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:41,471 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:41,471 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:41,471 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:41,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:41,471 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 [2018-10-24 12:16:41,479 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:41,479 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:41,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:41,507 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:41,550 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:16:41,550 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:41,673 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:16:41,694 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:41,695 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 17 [2018-10-24 12:16:41,695 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:41,695 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:16:41,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:16:41,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=194, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:16:41,696 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand 17 states. [2018-10-24 12:16:42,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:42,211 INFO L93 Difference]: Finished difference Result 109 states and 110 transitions. [2018-10-24 12:16:42,211 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:16:42,211 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 96 [2018-10-24 12:16:42,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:42,213 INFO L225 Difference]: With dead ends: 109 [2018-10-24 12:16:42,213 INFO L226 Difference]: Without dead ends: 107 [2018-10-24 12:16:42,214 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 182 SyntacticMatches, 19 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:16:42,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2018-10-24 12:16:42,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2018-10-24 12:16:42,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-10-24 12:16:42,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 108 transitions. [2018-10-24 12:16:42,220 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 108 transitions. Word has length 96 [2018-10-24 12:16:42,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:42,221 INFO L481 AbstractCegarLoop]: Abstraction has 107 states and 108 transitions. [2018-10-24 12:16:42,221 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:16:42,221 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 108 transitions. [2018-10-24 12:16:42,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-24 12:16:42,222 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:42,222 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:42,222 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:42,222 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:42,222 INFO L82 PathProgramCache]: Analyzing trace with hash 1915395141, now seen corresponding path program 17 times [2018-10-24 12:16:42,223 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:42,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:42,223 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:42,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:42,224 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:42,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:42,462 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:16:42,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:42,462 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:42,462 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:42,462 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:42,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:42,462 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 [2018-10-24 12:16:42,469 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:42,470 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:42,525 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 12:16:42,526 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:42,529 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:42,766 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:16:42,766 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:42,940 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:16:42,960 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:42,961 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 33 [2018-10-24 12:16:42,961 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:42,961 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:16:42,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:16:42,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=793, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:16:42,962 INFO L87 Difference]: Start difference. First operand 107 states and 108 transitions. Second operand 33 states. [2018-10-24 12:16:43,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:43,506 INFO L93 Difference]: Finished difference Result 158 states and 169 transitions. [2018-10-24 12:16:43,507 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:16:43,507 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 104 [2018-10-24 12:16:43,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:43,508 INFO L225 Difference]: With dead ends: 158 [2018-10-24 12:16:43,508 INFO L226 Difference]: Without dead ends: 109 [2018-10-24 12:16:43,509 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 179 SyntacticMatches, 20 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 659 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=472, Invalid=1420, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:16:43,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-10-24 12:16:43,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2018-10-24 12:16:43,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2018-10-24 12:16:43,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 110 transitions. [2018-10-24 12:16:43,516 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 110 transitions. Word has length 104 [2018-10-24 12:16:43,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:43,517 INFO L481 AbstractCegarLoop]: Abstraction has 109 states and 110 transitions. [2018-10-24 12:16:43,517 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:16:43,517 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 110 transitions. [2018-10-24 12:16:43,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2018-10-24 12:16:43,518 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:43,518 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:43,518 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:43,519 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:43,519 INFO L82 PathProgramCache]: Analyzing trace with hash -924860033, now seen corresponding path program 18 times [2018-10-24 12:16:43,519 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:43,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:43,520 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:43,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:43,520 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:43,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:43,685 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 127 proven. 196 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-24 12:16:43,686 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:43,686 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:43,686 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:43,686 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:43,686 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:43,686 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 [2018-10-24 12:16:43,693 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:43,694 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:43,723 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:43,723 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:43,725 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:43,789 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:16:43,789 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:44,019 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:16:44,040 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:44,040 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 18 [2018-10-24 12:16:44,040 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:44,040 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:16:44,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:16:44,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:16:44,041 INFO L87 Difference]: Start difference. First operand 109 states and 110 transitions. Second operand 18 states. [2018-10-24 12:16:44,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:44,256 INFO L93 Difference]: Finished difference Result 119 states and 120 transitions. [2018-10-24 12:16:44,260 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:16:44,260 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 106 [2018-10-24 12:16:44,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:44,261 INFO L225 Difference]: With dead ends: 119 [2018-10-24 12:16:44,261 INFO L226 Difference]: Without dead ends: 117 [2018-10-24 12:16:44,262 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 201 SyntacticMatches, 21 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:16:44,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-10-24 12:16:44,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2018-10-24 12:16:44,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-24 12:16:44,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 118 transitions. [2018-10-24 12:16:44,268 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 118 transitions. Word has length 106 [2018-10-24 12:16:44,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:44,269 INFO L481 AbstractCegarLoop]: Abstraction has 117 states and 118 transitions. [2018-10-24 12:16:44,269 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:16:44,269 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 118 transitions. [2018-10-24 12:16:44,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-10-24 12:16:44,270 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:44,270 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:44,270 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:44,271 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:44,271 INFO L82 PathProgramCache]: Analyzing trace with hash 1447724963, now seen corresponding path program 19 times [2018-10-24 12:16:44,271 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:44,272 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:44,272 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:44,272 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:44,272 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:44,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:44,553 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:16:44,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:44,553 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:44,553 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:44,553 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:44,554 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:44,554 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 [2018-10-24 12:16:44,562 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:44,562 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:44,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:44,597 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:45,343 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:16:45,343 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:45,634 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:16:45,655 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:45,655 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 36 [2018-10-24 12:16:45,655 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:45,655 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:16:45,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:16:45,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=949, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:16:45,656 INFO L87 Difference]: Start difference. First operand 117 states and 118 transitions. Second operand 36 states. [2018-10-24 12:16:46,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:46,213 INFO L93 Difference]: Finished difference Result 172 states and 184 transitions. [2018-10-24 12:16:46,222 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:16:46,222 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 114 [2018-10-24 12:16:46,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:46,223 INFO L225 Difference]: With dead ends: 172 [2018-10-24 12:16:46,223 INFO L226 Difference]: Without dead ends: 119 [2018-10-24 12:16:46,224 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 196 SyntacticMatches, 22 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 802 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=557, Invalid=1699, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:16:46,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2018-10-24 12:16:46,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2018-10-24 12:16:46,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-10-24 12:16:46,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 120 transitions. [2018-10-24 12:16:46,231 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 120 transitions. Word has length 114 [2018-10-24 12:16:46,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:46,232 INFO L481 AbstractCegarLoop]: Abstraction has 119 states and 120 transitions. [2018-10-24 12:16:46,232 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:16:46,232 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 120 transitions. [2018-10-24 12:16:46,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-24 12:16:46,233 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:46,233 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:46,233 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:46,233 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:46,234 INFO L82 PathProgramCache]: Analyzing trace with hash 1483074653, now seen corresponding path program 20 times [2018-10-24 12:16:46,234 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:46,234 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:46,234 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:46,234 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:46,235 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:46,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:46,625 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 151 proven. 238 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-24 12:16:46,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:46,625 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:46,625 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:46,625 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:46,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:46,625 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 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 [2018-10-24 12:16:46,637 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:46,637 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:46,680 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:16:46,680 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:46,683 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:46,718 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:16:46,718 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:46,918 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:16:46,939 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:46,939 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 19 [2018-10-24 12:16:46,939 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:46,939 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:16:46,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:16:46,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=239, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:16:46,940 INFO L87 Difference]: Start difference. First operand 119 states and 120 transitions. Second operand 19 states. [2018-10-24 12:16:47,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:47,125 INFO L93 Difference]: Finished difference Result 129 states and 130 transitions. [2018-10-24 12:16:47,126 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:16:47,126 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 116 [2018-10-24 12:16:47,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:47,128 INFO L225 Difference]: With dead ends: 129 [2018-10-24 12:16:47,128 INFO L226 Difference]: Without dead ends: 127 [2018-10-24 12:16:47,128 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 220 SyntacticMatches, 23 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=116, Invalid=304, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:16:47,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-24 12:16:47,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2018-10-24 12:16:47,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-10-24 12:16:47,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2018-10-24 12:16:47,135 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 116 [2018-10-24 12:16:47,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:47,135 INFO L481 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2018-10-24 12:16:47,136 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:16:47,136 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2018-10-24 12:16:47,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2018-10-24 12:16:47,137 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:47,137 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:47,137 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:47,137 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:47,137 INFO L82 PathProgramCache]: Analyzing trace with hash -849415039, now seen corresponding path program 21 times [2018-10-24 12:16:47,137 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:47,138 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:47,138 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:47,138 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:47,138 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:47,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:47,477 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:16:47,477 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:47,477 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:47,478 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:47,478 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:47,478 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:47,478 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 [2018-10-24 12:16:47,486 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:47,486 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:47,520 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:47,520 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:47,523 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:49,188 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:16:49,188 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:49,417 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:16:49,437 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:49,438 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 39 [2018-10-24 12:16:49,438 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:49,438 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:16:49,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:16:49,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=1119, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:16:49,439 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand 39 states. [2018-10-24 12:16:50,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:50,204 INFO L93 Difference]: Finished difference Result 186 states and 199 transitions. [2018-10-24 12:16:50,212 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:16:50,212 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 124 [2018-10-24 12:16:50,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:50,213 INFO L225 Difference]: With dead ends: 186 [2018-10-24 12:16:50,213 INFO L226 Difference]: Without dead ends: 129 [2018-10-24 12:16:50,216 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 213 SyntacticMatches, 24 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 959 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=649, Invalid=2003, Unknown=0, NotChecked=0, Total=2652 [2018-10-24 12:16:50,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-10-24 12:16:50,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2018-10-24 12:16:50,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-10-24 12:16:50,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 130 transitions. [2018-10-24 12:16:50,224 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 130 transitions. Word has length 124 [2018-10-24 12:16:50,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:50,224 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 130 transitions. [2018-10-24 12:16:50,224 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:16:50,224 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 130 transitions. [2018-10-24 12:16:50,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2018-10-24 12:16:50,225 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:50,225 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:50,226 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:50,226 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:50,226 INFO L82 PathProgramCache]: Analyzing trace with hash -1380501317, now seen corresponding path program 22 times [2018-10-24 12:16:50,226 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:50,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:50,227 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:50,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:50,227 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:50,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:50,454 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 177 proven. 284 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-24 12:16:50,454 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:50,454 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:50,454 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:50,454 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:50,454 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:50,454 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 [2018-10-24 12:16:50,463 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:50,463 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:50,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:50,498 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:50,554 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 178 proven. 253 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:16:50,555 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:50,736 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 178 proven. 253 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:16:50,756 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:50,756 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 20 [2018-10-24 12:16:50,756 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:50,756 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:16:50,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:16:50,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=263, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:16:50,757 INFO L87 Difference]: Start difference. First operand 129 states and 130 transitions. Second operand 20 states. [2018-10-24 12:16:50,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:50,962 INFO L93 Difference]: Finished difference Result 139 states and 140 transitions. [2018-10-24 12:16:50,962 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:16:50,962 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 126 [2018-10-24 12:16:50,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:50,964 INFO L225 Difference]: With dead ends: 139 [2018-10-24 12:16:50,964 INFO L226 Difference]: Without dead ends: 137 [2018-10-24 12:16:50,965 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 239 SyntacticMatches, 25 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=130, Invalid=332, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:16:50,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2018-10-24 12:16:50,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2018-10-24 12:16:50,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2018-10-24 12:16:50,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 138 transitions. [2018-10-24 12:16:50,972 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 138 transitions. Word has length 126 [2018-10-24 12:16:50,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:50,972 INFO L481 AbstractCegarLoop]: Abstraction has 137 states and 138 transitions. [2018-10-24 12:16:50,972 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:16:50,973 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 138 transitions. [2018-10-24 12:16:50,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-24 12:16:50,974 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:50,974 INFO L375 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:50,974 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:50,974 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:50,974 INFO L82 PathProgramCache]: Analyzing trace with hash 63242975, now seen corresponding path program 23 times [2018-10-24 12:16:50,974 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:50,975 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:50,975 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:50,975 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:50,975 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:50,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:51,307 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-24 12:16:51,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:51,320 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:51,320 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:51,320 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:51,320 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:51,320 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 [2018-10-24 12:16:51,327 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:51,328 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:51,373 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-10-24 12:16:51,373 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:51,377 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:51,716 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-24 12:16:51,716 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:52,050 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-24 12:16:52,070 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:52,070 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 42 [2018-10-24 12:16:52,071 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:52,071 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:16:52,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:16:52,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=1303, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:16:52,072 INFO L87 Difference]: Start difference. First operand 137 states and 138 transitions. Second operand 42 states. [2018-10-24 12:16:52,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:52,711 INFO L93 Difference]: Finished difference Result 200 states and 214 transitions. [2018-10-24 12:16:52,711 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:16:52,712 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 134 [2018-10-24 12:16:52,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:52,713 INFO L225 Difference]: With dead ends: 200 [2018-10-24 12:16:52,713 INFO L226 Difference]: Without dead ends: 139 [2018-10-24 12:16:52,714 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 230 SyntacticMatches, 26 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1130 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=748, Invalid=2332, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:16:52,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-24 12:16:52,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2018-10-24 12:16:52,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-10-24 12:16:52,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2018-10-24 12:16:52,723 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 134 [2018-10-24 12:16:52,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:52,723 INFO L481 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2018-10-24 12:16:52,723 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:16:52,723 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2018-10-24 12:16:52,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2018-10-24 12:16:52,724 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:52,724 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:52,725 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:52,725 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:52,725 INFO L82 PathProgramCache]: Analyzing trace with hash -781662567, now seen corresponding path program 24 times [2018-10-24 12:16:52,725 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:52,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:52,726 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:52,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:52,726 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:52,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:52,962 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 205 proven. 334 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-24 12:16:52,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:52,962 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:52,962 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:52,962 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:52,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:52,962 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 [2018-10-24 12:16:52,971 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:52,971 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:53,007 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:53,007 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:53,010 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:53,067 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 206 proven. 300 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-24 12:16:53,068 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:53,350 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 206 proven. 300 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-24 12:16:53,372 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:53,372 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 21 [2018-10-24 12:16:53,372 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:53,373 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:16:53,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:16:53,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=288, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:16:53,373 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand 21 states. [2018-10-24 12:16:53,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:53,842 INFO L93 Difference]: Finished difference Result 149 states and 150 transitions. [2018-10-24 12:16:53,842 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:16:53,843 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 136 [2018-10-24 12:16:53,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:53,844 INFO L225 Difference]: With dead ends: 149 [2018-10-24 12:16:53,844 INFO L226 Difference]: Without dead ends: 147 [2018-10-24 12:16:53,845 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 258 SyntacticMatches, 27 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=145, Invalid=361, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:16:53,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-10-24 12:16:53,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2018-10-24 12:16:53,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-10-24 12:16:53,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 148 transitions. [2018-10-24 12:16:53,853 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 148 transitions. Word has length 136 [2018-10-24 12:16:53,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:53,853 INFO L481 AbstractCegarLoop]: Abstraction has 147 states and 148 transitions. [2018-10-24 12:16:53,853 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:16:53,853 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 148 transitions. [2018-10-24 12:16:53,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2018-10-24 12:16:53,854 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:53,855 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:53,855 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:53,855 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:53,855 INFO L82 PathProgramCache]: Analyzing trace with hash 720491197, now seen corresponding path program 25 times [2018-10-24 12:16:53,855 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:53,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:53,856 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:53,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:53,856 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:53,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:55,159 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:16:55,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:55,159 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:55,159 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:55,160 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:55,160 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:55,160 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 [2018-10-24 12:16:55,170 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:55,170 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:55,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:55,209 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:55,609 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:16:55,610 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:55,911 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:16:55,931 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:55,931 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 45 [2018-10-24 12:16:55,932 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:55,932 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:16:55,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:16:55,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=479, Invalid=1501, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:16:55,933 INFO L87 Difference]: Start difference. First operand 147 states and 148 transitions. Second operand 45 states. [2018-10-24 12:16:57,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:57,525 INFO L93 Difference]: Finished difference Result 214 states and 229 transitions. [2018-10-24 12:16:57,525 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:16:57,526 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 144 [2018-10-24 12:16:57,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:57,527 INFO L225 Difference]: With dead ends: 214 [2018-10-24 12:16:57,527 INFO L226 Difference]: Without dead ends: 149 [2018-10-24 12:16:57,529 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 247 SyntacticMatches, 28 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1315 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=854, Invalid=2686, Unknown=0, NotChecked=0, Total=3540 [2018-10-24 12:16:57,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-10-24 12:16:57,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2018-10-24 12:16:57,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-10-24 12:16:57,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 150 transitions. [2018-10-24 12:16:57,539 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 150 transitions. Word has length 144 [2018-10-24 12:16:57,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:57,540 INFO L481 AbstractCegarLoop]: Abstraction has 149 states and 150 transitions. [2018-10-24 12:16:57,540 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:16:57,540 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 150 transitions. [2018-10-24 12:16:57,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-10-24 12:16:57,541 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:57,541 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:57,542 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:57,542 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:57,542 INFO L82 PathProgramCache]: Analyzing trace with hash -349719049, now seen corresponding path program 26 times [2018-10-24 12:16:57,542 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:57,543 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:57,543 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:57,543 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:57,543 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:57,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:58,034 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 235 proven. 388 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-24 12:16:58,034 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:58,034 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:58,034 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:58,034 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:58,034 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:58,034 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 [2018-10-24 12:16:58,041 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:58,041 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:58,100 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-24 12:16:58,101 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:58,104 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:58,223 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 236 proven. 351 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:16:58,223 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:58,454 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 236 proven. 351 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:16:58,474 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:58,474 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 22 [2018-10-24 12:16:58,474 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:58,474 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:16:58,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:16:58,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=314, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:16:58,475 INFO L87 Difference]: Start difference. First operand 149 states and 150 transitions. Second operand 22 states. [2018-10-24 12:16:58,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:58,708 INFO L93 Difference]: Finished difference Result 159 states and 160 transitions. [2018-10-24 12:16:58,708 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:16:58,708 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 146 [2018-10-24 12:16:58,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:58,709 INFO L225 Difference]: With dead ends: 159 [2018-10-24 12:16:58,709 INFO L226 Difference]: Without dead ends: 157 [2018-10-24 12:16:58,710 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 277 SyntacticMatches, 29 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=161, Invalid=391, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:16:58,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-24 12:16:58,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2018-10-24 12:16:58,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-10-24 12:16:58,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 158 transitions. [2018-10-24 12:16:58,717 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 158 transitions. Word has length 146 [2018-10-24 12:16:58,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:58,718 INFO L481 AbstractCegarLoop]: Abstraction has 157 states and 158 transitions. [2018-10-24 12:16:58,718 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:16:58,718 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 158 transitions. [2018-10-24 12:16:58,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2018-10-24 12:16:58,719 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:58,719 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:58,719 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:58,719 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:58,720 INFO L82 PathProgramCache]: Analyzing trace with hash -76381157, now seen corresponding path program 27 times [2018-10-24 12:16:58,720 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:58,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:58,721 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:58,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:58,721 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:58,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:59,838 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-24 12:16:59,838 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:59,839 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:59,839 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:59,839 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:59,839 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:59,839 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 [2018-10-24 12:16:59,849 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:59,849 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:59,895 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:59,895 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:59,899 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:00,579 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-24 12:17:00,579 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:01,066 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-24 12:17:01,088 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:01,088 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 48 [2018-10-24 12:17:01,088 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:01,089 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-24 12:17:01,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-24 12:17:01,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=543, Invalid=1713, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:17:01,090 INFO L87 Difference]: Start difference. First operand 157 states and 158 transitions. Second operand 48 states. [2018-10-24 12:17:01,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:01,548 INFO L93 Difference]: Finished difference Result 228 states and 244 transitions. [2018-10-24 12:17:01,549 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-24 12:17:01,549 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 154 [2018-10-24 12:17:01,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:01,551 INFO L225 Difference]: With dead ends: 228 [2018-10-24 12:17:01,551 INFO L226 Difference]: Without dead ends: 159 [2018-10-24 12:17:01,552 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 264 SyntacticMatches, 30 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1514 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=967, Invalid=3065, Unknown=0, NotChecked=0, Total=4032 [2018-10-24 12:17:01,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2018-10-24 12:17:01,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2018-10-24 12:17:01,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-10-24 12:17:01,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 160 transitions. [2018-10-24 12:17:01,561 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 160 transitions. Word has length 154 [2018-10-24 12:17:01,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:01,561 INFO L481 AbstractCegarLoop]: Abstraction has 159 states and 160 transitions. [2018-10-24 12:17:01,561 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-24 12:17:01,561 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 160 transitions. [2018-10-24 12:17:01,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-10-24 12:17:01,562 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:01,562 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:01,563 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:01,563 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:01,563 INFO L82 PathProgramCache]: Analyzing trace with hash 1136207573, now seen corresponding path program 28 times [2018-10-24 12:17:01,563 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:01,564 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:01,564 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:01,564 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:01,564 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:01,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:01,849 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 267 proven. 446 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-24 12:17:01,849 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:01,849 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:01,849 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:01,849 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:01,850 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:01,850 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 [2018-10-24 12:17:01,856 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:01,857 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:17:01,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:01,906 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:02,082 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 268 proven. 406 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-24 12:17:02,082 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:02,329 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 268 proven. 406 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-24 12:17:02,351 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:02,352 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 23 [2018-10-24 12:17:02,352 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:02,353 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:17:02,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:17:02,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=341, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:17:02,354 INFO L87 Difference]: Start difference. First operand 159 states and 160 transitions. Second operand 23 states. [2018-10-24 12:17:02,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:02,973 INFO L93 Difference]: Finished difference Result 169 states and 170 transitions. [2018-10-24 12:17:02,973 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:17:02,973 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 156 [2018-10-24 12:17:02,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:02,975 INFO L225 Difference]: With dead ends: 169 [2018-10-24 12:17:02,975 INFO L226 Difference]: Without dead ends: 167 [2018-10-24 12:17:02,976 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 296 SyntacticMatches, 31 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=178, Invalid=422, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:17:02,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2018-10-24 12:17:02,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 167. [2018-10-24 12:17:02,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:17:02,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 168 transitions. [2018-10-24 12:17:02,984 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 168 transitions. Word has length 156 [2018-10-24 12:17:02,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:02,984 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 168 transitions. [2018-10-24 12:17:02,984 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:17:02,984 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 168 transitions. [2018-10-24 12:17:02,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-10-24 12:17:02,985 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:02,986 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:02,986 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:02,986 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:02,986 INFO L82 PathProgramCache]: Analyzing trace with hash -1226033415, now seen corresponding path program 29 times [2018-10-24 12:17:02,986 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:02,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:02,987 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:02,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:02,987 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:02,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:03,716 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:17:03,716 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:03,716 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:03,716 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:03,716 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:03,716 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:03,716 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 [2018-10-24 12:17:03,725 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:17:03,725 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:17:03,935 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-24 12:17:03,935 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:03,943 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:04,491 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:17:04,491 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:04,868 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:17:04,888 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:04,889 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 51 [2018-10-24 12:17:04,889 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:04,889 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-24 12:17:04,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-24 12:17:04,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=611, Invalid=1939, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:17:04,891 INFO L87 Difference]: Start difference. First operand 167 states and 168 transitions. Second operand 51 states. [2018-10-24 12:17:06,332 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-24 12:17:07,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:07,035 INFO L93 Difference]: Finished difference Result 242 states and 259 transitions. [2018-10-24 12:17:07,035 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:17:07,035 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 164 [2018-10-24 12:17:07,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:07,036 INFO L225 Difference]: With dead ends: 242 [2018-10-24 12:17:07,036 INFO L226 Difference]: Without dead ends: 169 [2018-10-24 12:17:07,039 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 379 GetRequests, 281 SyntacticMatches, 32 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1727 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1087, Invalid=3469, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:17:07,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-10-24 12:17:07,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-10-24 12:17:07,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-10-24 12:17:07,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2018-10-24 12:17:07,048 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 164 [2018-10-24 12:17:07,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:07,048 INFO L481 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2018-10-24 12:17:07,048 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-24 12:17:07,049 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2018-10-24 12:17:07,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2018-10-24 12:17:07,050 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:07,050 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:07,050 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:07,050 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:07,050 INFO L82 PathProgramCache]: Analyzing trace with hash -956679885, now seen corresponding path program 30 times [2018-10-24 12:17:07,050 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:07,051 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:07,051 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:07,051 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:07,051 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:07,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:07,425 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 301 proven. 508 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-24 12:17:07,425 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:07,425 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:07,425 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:07,425 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:07,426 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:07,426 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 [2018-10-24 12:17:07,435 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:17:07,435 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:17:07,485 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:17:07,485 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:07,489 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:08,140 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 302 proven. 465 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:17:08,140 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:08,449 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 302 proven. 465 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:17:08,470 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:08,470 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 24 [2018-10-24 12:17:08,470 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:08,471 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:17:08,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:17:08,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=369, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:17:08,472 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand 24 states. [2018-10-24 12:17:08,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:08,806 INFO L93 Difference]: Finished difference Result 179 states and 180 transitions. [2018-10-24 12:17:08,806 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:17:08,806 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 166 [2018-10-24 12:17:08,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:08,808 INFO L225 Difference]: With dead ends: 179 [2018-10-24 12:17:08,808 INFO L226 Difference]: Without dead ends: 177 [2018-10-24 12:17:08,809 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 315 SyntacticMatches, 33 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 388 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=196, Invalid=454, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:17:08,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-10-24 12:17:08,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 177. [2018-10-24 12:17:08,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-10-24 12:17:08,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 178 transitions. [2018-10-24 12:17:08,817 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 178 transitions. Word has length 166 [2018-10-24 12:17:08,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:08,818 INFO L481 AbstractCegarLoop]: Abstraction has 177 states and 178 transitions. [2018-10-24 12:17:08,818 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:17:08,818 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 178 transitions. [2018-10-24 12:17:08,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-10-24 12:17:08,819 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:08,819 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:08,820 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:08,820 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:08,820 INFO L82 PathProgramCache]: Analyzing trace with hash -1441002665, now seen corresponding path program 31 times [2018-10-24 12:17:08,820 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:08,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:08,821 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:08,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:08,821 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:08,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:09,647 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-24 12:17:09,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:09,647 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:09,647 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:09,648 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:09,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:09,648 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 [2018-10-24 12:17:09,655 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:09,655 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:17:09,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:09,715 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:10,644 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-24 12:17:10,644 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:11,200 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-24 12:17:11,220 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:11,220 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 54 [2018-10-24 12:17:11,221 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:11,221 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-24 12:17:11,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-24 12:17:11,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=683, Invalid=2179, Unknown=0, NotChecked=0, Total=2862 [2018-10-24 12:17:11,222 INFO L87 Difference]: Start difference. First operand 177 states and 178 transitions. Second operand 54 states. [2018-10-24 12:17:12,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:12,320 INFO L93 Difference]: Finished difference Result 256 states and 274 transitions. [2018-10-24 12:17:12,321 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-24 12:17:12,321 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 174 [2018-10-24 12:17:12,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:12,323 INFO L225 Difference]: With dead ends: 256 [2018-10-24 12:17:12,323 INFO L226 Difference]: Without dead ends: 179 [2018-10-24 12:17:12,325 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 298 SyntacticMatches, 34 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1954 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1214, Invalid=3898, Unknown=0, NotChecked=0, Total=5112 [2018-10-24 12:17:12,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2018-10-24 12:17:12,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2018-10-24 12:17:12,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2018-10-24 12:17:12,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 180 transitions. [2018-10-24 12:17:12,335 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 180 transitions. Word has length 174 [2018-10-24 12:17:12,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:12,335 INFO L481 AbstractCegarLoop]: Abstraction has 179 states and 180 transitions. [2018-10-24 12:17:12,335 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-24 12:17:12,335 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 180 transitions. [2018-10-24 12:17:12,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-10-24 12:17:12,337 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:12,337 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:12,337 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:12,337 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:12,337 INFO L82 PathProgramCache]: Analyzing trace with hash 98569489, now seen corresponding path program 32 times [2018-10-24 12:17:12,337 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:12,338 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:12,338 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:12,338 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:12,339 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:12,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:12,652 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 337 proven. 574 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-24 12:17:12,652 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:12,653 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:12,653 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:12,653 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:12,653 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:12,653 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 [2018-10-24 12:17:12,661 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:17:12,661 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:17:12,730 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-24 12:17:12,730 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:12,735 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:12,800 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 338 proven. 528 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-24 12:17:12,801 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:13,092 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 338 proven. 528 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-24 12:17:13,112 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:13,112 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 25 [2018-10-24 12:17:13,112 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:13,113 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:17:13,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:17:13,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=398, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:17:13,113 INFO L87 Difference]: Start difference. First operand 179 states and 180 transitions. Second operand 25 states. [2018-10-24 12:17:13,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:13,727 INFO L93 Difference]: Finished difference Result 189 states and 190 transitions. [2018-10-24 12:17:13,727 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 12:17:13,727 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 176 [2018-10-24 12:17:13,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:13,728 INFO L225 Difference]: With dead ends: 189 [2018-10-24 12:17:13,729 INFO L226 Difference]: Without dead ends: 187 [2018-10-24 12:17:13,729 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 334 SyntacticMatches, 35 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 429 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=215, Invalid=487, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:17:13,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-24 12:17:13,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2018-10-24 12:17:13,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-10-24 12:17:13,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 188 transitions. [2018-10-24 12:17:13,739 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 188 transitions. Word has length 176 [2018-10-24 12:17:13,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:13,739 INFO L481 AbstractCegarLoop]: Abstraction has 187 states and 188 transitions. [2018-10-24 12:17:13,739 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:17:13,739 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 188 transitions. [2018-10-24 12:17:13,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2018-10-24 12:17:13,740 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:13,741 INFO L375 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:13,741 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:13,741 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:13,741 INFO L82 PathProgramCache]: Analyzing trace with hash 785850677, now seen corresponding path program 33 times [2018-10-24 12:17:13,741 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:13,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:13,742 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:13,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:13,742 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:13,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:14,347 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:17:14,348 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:14,348 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:14,348 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:14,348 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:14,348 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:14,348 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:14,356 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:17:14,356 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:17:14,409 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:17:14,409 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:14,414 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:15,296 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:17:15,297 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:16,028 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:17:16,049 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:16,049 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 57 [2018-10-24 12:17:16,049 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:16,049 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-24 12:17:16,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-24 12:17:16,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=759, Invalid=2433, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:17:16,050 INFO L87 Difference]: Start difference. First operand 187 states and 188 transitions. Second operand 57 states. [2018-10-24 12:17:17,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:17,146 INFO L93 Difference]: Finished difference Result 270 states and 289 transitions. [2018-10-24 12:17:17,155 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:17:17,155 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 184 [2018-10-24 12:17:17,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:17,156 INFO L225 Difference]: With dead ends: 270 [2018-10-24 12:17:17,156 INFO L226 Difference]: Without dead ends: 189 [2018-10-24 12:17:17,157 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 315 SyntacticMatches, 36 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2195 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1348, Invalid=4352, Unknown=0, NotChecked=0, Total=5700 [2018-10-24 12:17:17,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2018-10-24 12:17:17,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 189. [2018-10-24 12:17:17,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-10-24 12:17:17,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 190 transitions. [2018-10-24 12:17:17,167 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 190 transitions. Word has length 184 [2018-10-24 12:17:17,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:17,167 INFO L481 AbstractCegarLoop]: Abstraction has 189 states and 190 transitions. [2018-10-24 12:17:17,167 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-24 12:17:17,167 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 190 transitions. [2018-10-24 12:17:17,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-10-24 12:17:17,169 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:17,169 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:17,169 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:17,169 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:17,169 INFO L82 PathProgramCache]: Analyzing trace with hash -1200110993, now seen corresponding path program 34 times [2018-10-24 12:17:17,169 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:17,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:17,170 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:17,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:17,171 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:17,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:17,731 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 375 proven. 644 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-24 12:17:17,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:17,731 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:17,731 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:17,732 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:17,732 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:17,732 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:17,740 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:17,740 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:17:17,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:17,795 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:17,903 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 376 proven. 595 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:17:17,903 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:18,221 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 376 proven. 595 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:17:18,243 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:18,244 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 26 [2018-10-24 12:17:18,244 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:18,244 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:17:18,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:17:18,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=428, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:17:18,245 INFO L87 Difference]: Start difference. First operand 189 states and 190 transitions. Second operand 26 states. [2018-10-24 12:17:18,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:18,508 INFO L93 Difference]: Finished difference Result 199 states and 200 transitions. [2018-10-24 12:17:18,508 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:17:18,508 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 186 [2018-10-24 12:17:18,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:18,510 INFO L225 Difference]: With dead ends: 199 [2018-10-24 12:17:18,511 INFO L226 Difference]: Without dead ends: 197 [2018-10-24 12:17:18,511 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 353 SyntacticMatches, 37 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 472 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=235, Invalid=521, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:17:18,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-10-24 12:17:18,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 197. [2018-10-24 12:17:18,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2018-10-24 12:17:18,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 198 transitions. [2018-10-24 12:17:18,521 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 198 transitions. Word has length 186 [2018-10-24 12:17:18,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:18,521 INFO L481 AbstractCegarLoop]: Abstraction has 197 states and 198 transitions. [2018-10-24 12:17:18,521 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:17:18,522 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 198 transitions. [2018-10-24 12:17:18,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-10-24 12:17:18,523 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:18,523 INFO L375 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 19, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:18,523 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:18,523 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:18,523 INFO L82 PathProgramCache]: Analyzing trace with hash 772446355, now seen corresponding path program 35 times [2018-10-24 12:17:18,523 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:18,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:18,524 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:18,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:18,524 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:18,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:19,139 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-24 12:17:19,140 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:19,140 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:19,140 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:19,140 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:19,140 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:19,140 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:19,147 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:17:19,147 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:17:19,230 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-10-24 12:17:19,230 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:19,234 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:19,999 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-24 12:17:19,999 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:20,886 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-24 12:17:20,906 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:20,907 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 60 [2018-10-24 12:17:20,907 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:20,907 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-24 12:17:20,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-24 12:17:20,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=839, Invalid=2701, Unknown=0, NotChecked=0, Total=3540 [2018-10-24 12:17:20,908 INFO L87 Difference]: Start difference. First operand 197 states and 198 transitions. Second operand 60 states. [2018-10-24 12:17:22,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:22,176 INFO L93 Difference]: Finished difference Result 284 states and 304 transitions. [2018-10-24 12:17:22,177 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:17:22,177 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 194 [2018-10-24 12:17:22,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:22,178 INFO L225 Difference]: With dead ends: 284 [2018-10-24 12:17:22,178 INFO L226 Difference]: Without dead ends: 199 [2018-10-24 12:17:22,180 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 448 GetRequests, 332 SyntacticMatches, 38 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2450 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1489, Invalid=4831, Unknown=0, NotChecked=0, Total=6320 [2018-10-24 12:17:22,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-10-24 12:17:22,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 199. [2018-10-24 12:17:22,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2018-10-24 12:17:22,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 200 transitions. [2018-10-24 12:17:22,189 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 200 transitions. Word has length 194 [2018-10-24 12:17:22,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:22,189 INFO L481 AbstractCegarLoop]: Abstraction has 199 states and 200 transitions. [2018-10-24 12:17:22,189 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-24 12:17:22,190 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 200 transitions. [2018-10-24 12:17:22,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2018-10-24 12:17:22,191 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:22,191 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:22,191 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:22,191 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:22,191 INFO L82 PathProgramCache]: Analyzing trace with hash -1075414707, now seen corresponding path program 36 times [2018-10-24 12:17:22,191 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:22,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:22,192 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:22,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:22,192 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:22,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:22,554 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 415 proven. 718 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-24 12:17:22,554 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:22,554 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:22,554 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:22,554 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:22,554 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:22,554 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:22,562 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:17:22,562 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:17:22,613 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:17:22,613 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:22,617 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:22,719 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 416 proven. 666 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-24 12:17:22,719 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:23,078 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 416 proven. 666 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-24 12:17:23,099 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:23,099 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 27 [2018-10-24 12:17:23,099 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:23,100 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:17:23,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:17:23,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=459, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:17:23,100 INFO L87 Difference]: Start difference. First operand 199 states and 200 transitions. Second operand 27 states. [2018-10-24 12:17:23,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:23,340 INFO L93 Difference]: Finished difference Result 209 states and 210 transitions. [2018-10-24 12:17:23,340 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:17:23,341 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 196 [2018-10-24 12:17:23,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:23,342 INFO L225 Difference]: With dead ends: 209 [2018-10-24 12:17:23,343 INFO L226 Difference]: Without dead ends: 207 [2018-10-24 12:17:23,343 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 372 SyntacticMatches, 39 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=256, Invalid=556, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:17:23,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2018-10-24 12:17:23,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2018-10-24 12:17:23,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-10-24 12:17:23,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 208 transitions. [2018-10-24 12:17:23,351 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 208 transitions. Word has length 196 [2018-10-24 12:17:23,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:23,352 INFO L481 AbstractCegarLoop]: Abstraction has 207 states and 208 transitions. [2018-10-24 12:17:23,352 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:17:23,352 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 208 transitions. [2018-10-24 12:17:23,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-10-24 12:17:23,353 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:23,353 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:23,353 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:23,354 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:23,354 INFO L82 PathProgramCache]: Analyzing trace with hash 565940593, now seen corresponding path program 37 times [2018-10-24 12:17:23,354 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:23,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:23,354 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:23,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:23,355 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:23,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:24,030 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:17:24,030 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:24,030 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:24,030 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:24,030 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:24,030 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:24,030 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 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:24,038 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:24,038 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:17:24,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:24,101 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:24,852 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:17:24,852 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:25,420 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:17:25,440 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:25,440 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 63 [2018-10-24 12:17:25,440 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:25,441 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-10-24 12:17:25,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-10-24 12:17:25,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=923, Invalid=2983, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:17:25,441 INFO L87 Difference]: Start difference. First operand 207 states and 208 transitions. Second operand 63 states. [2018-10-24 12:17:26,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:26,872 INFO L93 Difference]: Finished difference Result 298 states and 319 transitions. [2018-10-24 12:17:26,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:17:26,874 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 204 [2018-10-24 12:17:26,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:26,875 INFO L225 Difference]: With dead ends: 298 [2018-10-24 12:17:26,875 INFO L226 Difference]: Without dead ends: 209 [2018-10-24 12:17:26,877 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 349 SyntacticMatches, 40 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2719 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1637, Invalid=5335, Unknown=0, NotChecked=0, Total=6972 [2018-10-24 12:17:26,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2018-10-24 12:17:26,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 209. [2018-10-24 12:17:26,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2018-10-24 12:17:26,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 210 transitions. [2018-10-24 12:17:26,886 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 210 transitions. Word has length 204 [2018-10-24 12:17:26,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:26,887 INFO L481 AbstractCegarLoop]: Abstraction has 209 states and 210 transitions. [2018-10-24 12:17:26,887 INFO L482 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-10-24 12:17:26,887 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 210 transitions. [2018-10-24 12:17:26,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-10-24 12:17:26,888 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:26,888 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:26,888 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:26,889 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:26,889 INFO L82 PathProgramCache]: Analyzing trace with hash -1469492821, now seen corresponding path program 38 times [2018-10-24 12:17:26,889 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:26,889 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:26,890 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:26,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:26,890 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:26,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:27,411 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 457 proven. 796 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-24 12:17:27,412 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:27,412 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:27,412 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:27,412 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:27,412 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:27,412 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:27,419 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:17:27,419 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:17:27,541 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-24 12:17:27,541 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:27,546 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:27,927 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 458 proven. 741 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:17:27,928 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:28,322 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 458 proven. 741 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:17:28,342 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:28,342 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 28 [2018-10-24 12:17:28,342 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:28,342 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:17:28,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:17:28,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=491, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:17:28,343 INFO L87 Difference]: Start difference. First operand 209 states and 210 transitions. Second operand 28 states. [2018-10-24 12:17:28,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:28,674 INFO L93 Difference]: Finished difference Result 219 states and 220 transitions. [2018-10-24 12:17:28,675 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:17:28,675 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 206 [2018-10-24 12:17:28,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:28,676 INFO L225 Difference]: With dead ends: 219 [2018-10-24 12:17:28,677 INFO L226 Difference]: Without dead ends: 217 [2018-10-24 12:17:28,677 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 391 SyntacticMatches, 41 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 564 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=278, Invalid=592, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:17:28,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2018-10-24 12:17:28,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 217. [2018-10-24 12:17:28,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2018-10-24 12:17:28,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 218 transitions. [2018-10-24 12:17:28,688 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 218 transitions. Word has length 206 [2018-10-24 12:17:28,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:28,689 INFO L481 AbstractCegarLoop]: Abstraction has 217 states and 218 transitions. [2018-10-24 12:17:28,689 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:17:28,689 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 218 transitions. [2018-10-24 12:17:28,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2018-10-24 12:17:28,690 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:28,690 INFO L375 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 21, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:28,690 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:28,691 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:28,691 INFO L82 PathProgramCache]: Analyzing trace with hash -1761137713, now seen corresponding path program 39 times [2018-10-24 12:17:28,691 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:28,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:28,692 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:28,692 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:28,692 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:28,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:29,566 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-24 12:17:29,566 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:29,566 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:29,566 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:29,566 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:29,566 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:29,566 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:29,574 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:17:29,575 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:17:29,631 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:17:29,631 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:29,635 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:30,537 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-24 12:17:30,537 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:31,385 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-24 12:17:31,406 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:31,406 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 66 [2018-10-24 12:17:31,406 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:31,407 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-10-24 12:17:31,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-10-24 12:17:31,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1011, Invalid=3279, Unknown=0, NotChecked=0, Total=4290 [2018-10-24 12:17:31,407 INFO L87 Difference]: Start difference. First operand 217 states and 218 transitions. Second operand 66 states. [2018-10-24 12:17:33,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:33,174 INFO L93 Difference]: Finished difference Result 312 states and 334 transitions. [2018-10-24 12:17:33,174 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-24 12:17:33,174 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 214 [2018-10-24 12:17:33,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:33,175 INFO L225 Difference]: With dead ends: 312 [2018-10-24 12:17:33,176 INFO L226 Difference]: Without dead ends: 219 [2018-10-24 12:17:33,177 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 366 SyntacticMatches, 42 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3002 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1792, Invalid=5864, Unknown=0, NotChecked=0, Total=7656 [2018-10-24 12:17:33,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-10-24 12:17:33,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2018-10-24 12:17:33,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2018-10-24 12:17:33,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 220 transitions. [2018-10-24 12:17:33,187 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 220 transitions. Word has length 214 [2018-10-24 12:17:33,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:33,187 INFO L481 AbstractCegarLoop]: Abstraction has 219 states and 220 transitions. [2018-10-24 12:17:33,187 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-10-24 12:17:33,188 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 220 transitions. [2018-10-24 12:17:33,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2018-10-24 12:17:33,189 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:33,189 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:33,189 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:33,189 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:33,190 INFO L82 PathProgramCache]: Analyzing trace with hash -1420465271, now seen corresponding path program 40 times [2018-10-24 12:17:33,190 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:33,190 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:33,190 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:33,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:33,191 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:33,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:34,478 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 501 proven. 878 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2018-10-24 12:17:34,478 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:34,478 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:34,478 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:34,479 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:34,479 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:34,479 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:34,494 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:34,495 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:17:34,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:34,559 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:34,639 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 502 proven. 820 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-24 12:17:34,640 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:35,101 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 502 proven. 820 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-24 12:17:35,120 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:35,121 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 29 [2018-10-24 12:17:35,121 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:35,121 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:17:35,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:17:35,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=524, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:17:35,122 INFO L87 Difference]: Start difference. First operand 219 states and 220 transitions. Second operand 29 states. [2018-10-24 12:17:35,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:35,383 INFO L93 Difference]: Finished difference Result 229 states and 230 transitions. [2018-10-24 12:17:35,383 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:17:35,384 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 216 [2018-10-24 12:17:35,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:35,386 INFO L225 Difference]: With dead ends: 229 [2018-10-24 12:17:35,386 INFO L226 Difference]: Without dead ends: 227 [2018-10-24 12:17:35,386 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 410 SyntacticMatches, 43 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 613 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=301, Invalid=629, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:17:35,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2018-10-24 12:17:35,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 227. [2018-10-24 12:17:35,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 227 states. [2018-10-24 12:17:35,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 228 transitions. [2018-10-24 12:17:35,396 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 228 transitions. Word has length 216 [2018-10-24 12:17:35,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:35,397 INFO L481 AbstractCegarLoop]: Abstraction has 227 states and 228 transitions. [2018-10-24 12:17:35,397 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:17:35,397 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 228 transitions. [2018-10-24 12:17:35,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2018-10-24 12:17:35,398 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:35,398 INFO L375 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:35,399 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:35,399 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:35,399 INFO L82 PathProgramCache]: Analyzing trace with hash 807569325, now seen corresponding path program 41 times [2018-10-24 12:17:35,399 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:35,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:35,400 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:35,400 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:35,400 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:35,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:36,792 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:17:36,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:36,793 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:36,793 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:36,793 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:36,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:36,793 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:36,803 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:17:36,804 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:17:36,943 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-10-24 12:17:36,944 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:36,948 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:37,779 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:17:37,779 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:38,419 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:17:38,439 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:38,440 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 69 [2018-10-24 12:17:38,440 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:38,440 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-10-24 12:17:38,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-10-24 12:17:38,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1103, Invalid=3589, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:17:38,441 INFO L87 Difference]: Start difference. First operand 227 states and 228 transitions. Second operand 69 states. [2018-10-24 12:17:40,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:40,064 INFO L93 Difference]: Finished difference Result 326 states and 349 transitions. [2018-10-24 12:17:40,064 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:17:40,064 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 224 [2018-10-24 12:17:40,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:40,065 INFO L225 Difference]: With dead ends: 326 [2018-10-24 12:17:40,066 INFO L226 Difference]: Without dead ends: 229 [2018-10-24 12:17:40,067 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 383 SyntacticMatches, 44 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3299 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1954, Invalid=6418, Unknown=0, NotChecked=0, Total=8372 [2018-10-24 12:17:40,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2018-10-24 12:17:40,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 229. [2018-10-24 12:17:40,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2018-10-24 12:17:40,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 230 transitions. [2018-10-24 12:17:40,077 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 230 transitions. Word has length 224 [2018-10-24 12:17:40,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:40,077 INFO L481 AbstractCegarLoop]: Abstraction has 229 states and 230 transitions. [2018-10-24 12:17:40,077 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-10-24 12:17:40,077 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 230 transitions. [2018-10-24 12:17:40,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2018-10-24 12:17:40,078 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:40,078 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:40,079 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:40,079 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:40,079 INFO L82 PathProgramCache]: Analyzing trace with hash 823650023, now seen corresponding path program 42 times [2018-10-24 12:17:40,079 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:40,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:40,080 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:40,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:40,080 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:40,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:40,999 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 547 proven. 964 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2018-10-24 12:17:40,999 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:40,999 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:40,999 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:40,999 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:40,999 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:41,000 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 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:41,007 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:17:41,007 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:17:41,075 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:17:41,075 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:41,079 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:41,222 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 548 proven. 903 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:17:41,222 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:41,747 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 548 proven. 903 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:17:41,768 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:41,769 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27] total 30 [2018-10-24 12:17:41,769 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:41,769 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:17:41,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:17:41,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=558, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:17:41,770 INFO L87 Difference]: Start difference. First operand 229 states and 230 transitions. Second operand 30 states. [2018-10-24 12:17:42,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:42,105 INFO L93 Difference]: Finished difference Result 239 states and 240 transitions. [2018-10-24 12:17:42,106 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:17:42,106 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 226 [2018-10-24 12:17:42,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:42,108 INFO L225 Difference]: With dead ends: 239 [2018-10-24 12:17:42,108 INFO L226 Difference]: Without dead ends: 237 [2018-10-24 12:17:42,108 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 429 SyntacticMatches, 45 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 664 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=325, Invalid=667, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:17:42,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2018-10-24 12:17:42,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 237. [2018-10-24 12:17:42,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 237 states. [2018-10-24 12:17:42,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 238 transitions. [2018-10-24 12:17:42,118 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 238 transitions. Word has length 226 [2018-10-24 12:17:42,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:42,119 INFO L481 AbstractCegarLoop]: Abstraction has 237 states and 238 transitions. [2018-10-24 12:17:42,119 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:17:42,119 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 238 transitions. [2018-10-24 12:17:42,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2018-10-24 12:17:42,120 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:42,120 INFO L375 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 23, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:42,121 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:42,121 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:42,121 INFO L82 PathProgramCache]: Analyzing trace with hash 643482891, now seen corresponding path program 43 times [2018-10-24 12:17:42,121 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:42,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:42,122 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:42,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:42,122 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:42,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:43,478 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-24 12:17:43,478 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:43,478 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:43,478 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:43,479 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:43,479 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:43,479 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 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:43,488 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:43,488 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:17:43,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:43,557 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:44,497 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-24 12:17:44,497 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:45,239 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-24 12:17:45,259 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:45,259 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 72 [2018-10-24 12:17:45,259 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:45,260 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-10-24 12:17:45,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-10-24 12:17:45,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1199, Invalid=3913, Unknown=0, NotChecked=0, Total=5112 [2018-10-24 12:17:45,261 INFO L87 Difference]: Start difference. First operand 237 states and 238 transitions. Second operand 72 states. [2018-10-24 12:17:46,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:46,672 INFO L93 Difference]: Finished difference Result 340 states and 364 transitions. [2018-10-24 12:17:46,672 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-24 12:17:46,673 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 234 [2018-10-24 12:17:46,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:46,674 INFO L225 Difference]: With dead ends: 340 [2018-10-24 12:17:46,674 INFO L226 Difference]: Without dead ends: 239 [2018-10-24 12:17:46,676 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 540 GetRequests, 400 SyntacticMatches, 46 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3610 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2123, Invalid=6997, Unknown=0, NotChecked=0, Total=9120 [2018-10-24 12:17:46,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2018-10-24 12:17:46,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 239. [2018-10-24 12:17:46,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2018-10-24 12:17:46,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 240 transitions. [2018-10-24 12:17:46,687 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 240 transitions. Word has length 234 [2018-10-24 12:17:46,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:46,687 INFO L481 AbstractCegarLoop]: Abstraction has 239 states and 240 transitions. [2018-10-24 12:17:46,687 INFO L482 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-10-24 12:17:46,687 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 240 transitions. [2018-10-24 12:17:46,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2018-10-24 12:17:46,689 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:46,689 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:46,689 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:46,689 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:46,689 INFO L82 PathProgramCache]: Analyzing trace with hash -751443003, now seen corresponding path program 44 times [2018-10-24 12:17:46,690 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:46,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:46,690 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:46,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:46,690 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:46,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:47,225 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 595 proven. 1054 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-24 12:17:47,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:47,226 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:47,226 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:47,226 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:47,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:47,226 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:47,234 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:17:47,234 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:17:47,323 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-24 12:17:47,323 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:47,327 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:47,849 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 596 proven. 990 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-24 12:17:47,849 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:48,824 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 596 proven. 990 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-24 12:17:48,845 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:48,845 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 31 [2018-10-24 12:17:48,845 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:48,845 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:17:48,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:17:48,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=593, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:17:48,846 INFO L87 Difference]: Start difference. First operand 239 states and 240 transitions. Second operand 31 states. [2018-10-24 12:17:49,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:49,149 INFO L93 Difference]: Finished difference Result 249 states and 250 transitions. [2018-10-24 12:17:49,149 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-24 12:17:49,150 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 236 [2018-10-24 12:17:49,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:49,152 INFO L225 Difference]: With dead ends: 249 [2018-10-24 12:17:49,152 INFO L226 Difference]: Without dead ends: 247 [2018-10-24 12:17:49,152 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 448 SyntacticMatches, 47 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 717 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=350, Invalid=706, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:17:49,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-10-24 12:17:49,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 247. [2018-10-24 12:17:49,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2018-10-24 12:17:49,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 248 transitions. [2018-10-24 12:17:49,163 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 248 transitions. Word has length 236 [2018-10-24 12:17:49,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:49,163 INFO L481 AbstractCegarLoop]: Abstraction has 247 states and 248 transitions. [2018-10-24 12:17:49,163 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:17:49,163 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 248 transitions. [2018-10-24 12:17:49,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2018-10-24 12:17:49,165 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:49,165 INFO L375 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 24, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:49,165 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:49,165 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:49,166 INFO L82 PathProgramCache]: Analyzing trace with hash 1276445673, now seen corresponding path program 45 times [2018-10-24 12:17:49,166 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:49,166 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:49,166 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:49,166 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:49,167 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:49,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:50,097 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:17:50,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:50,097 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:50,097 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:50,097 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:50,098 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:50,098 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 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:50,106 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:17:50,106 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:17:50,174 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:17:50,174 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:50,179 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:51,249 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:17:51,249 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:52,342 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:17:52,363 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:52,363 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 75 [2018-10-24 12:17:52,363 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:52,363 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-10-24 12:17:52,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-10-24 12:17:52,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1299, Invalid=4251, Unknown=0, NotChecked=0, Total=5550 [2018-10-24 12:17:52,365 INFO L87 Difference]: Start difference. First operand 247 states and 248 transitions. Second operand 75 states. [2018-10-24 12:17:53,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:53,922 INFO L93 Difference]: Finished difference Result 354 states and 379 transitions. [2018-10-24 12:17:53,922 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-24 12:17:53,922 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 244 [2018-10-24 12:17:53,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:53,923 INFO L225 Difference]: With dead ends: 354 [2018-10-24 12:17:53,923 INFO L226 Difference]: Without dead ends: 249 [2018-10-24 12:17:53,925 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 563 GetRequests, 417 SyntacticMatches, 48 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3935 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2299, Invalid=7601, Unknown=0, NotChecked=0, Total=9900 [2018-10-24 12:17:53,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2018-10-24 12:17:53,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 249. [2018-10-24 12:17:53,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 249 states. [2018-10-24 12:17:53,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 250 transitions. [2018-10-24 12:17:53,937 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 250 transitions. Word has length 244 [2018-10-24 12:17:53,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:53,937 INFO L481 AbstractCegarLoop]: Abstraction has 249 states and 250 transitions. [2018-10-24 12:17:53,937 INFO L482 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-10-24 12:17:53,937 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 250 transitions. [2018-10-24 12:17:53,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2018-10-24 12:17:53,939 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:53,939 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:53,939 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:53,939 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:53,939 INFO L82 PathProgramCache]: Analyzing trace with hash -565411293, now seen corresponding path program 46 times [2018-10-24 12:17:53,940 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:53,940 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:53,940 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:53,940 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:53,940 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:53,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:54,388 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 645 proven. 1148 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2018-10-24 12:17:54,388 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:54,388 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:54,389 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:54,389 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:54,389 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:54,389 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 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:54,395 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:54,395 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:17:54,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:54,464 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:54,552 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 646 proven. 1081 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:17:54,552 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:55,127 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 646 proven. 1081 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:17:55,147 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:55,148 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 32 [2018-10-24 12:17:55,148 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:55,148 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:17:55,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:17:55,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=629, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:17:55,149 INFO L87 Difference]: Start difference. First operand 249 states and 250 transitions. Second operand 32 states. [2018-10-24 12:17:55,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:55,437 INFO L93 Difference]: Finished difference Result 259 states and 260 transitions. [2018-10-24 12:17:55,437 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:17:55,437 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 246 [2018-10-24 12:17:55,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:55,439 INFO L225 Difference]: With dead ends: 259 [2018-10-24 12:17:55,439 INFO L226 Difference]: Without dead ends: 257 [2018-10-24 12:17:55,440 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 467 SyntacticMatches, 49 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 772 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=376, Invalid=746, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:17:55,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2018-10-24 12:17:55,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 257. [2018-10-24 12:17:55,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 257 states. [2018-10-24 12:17:55,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 258 transitions. [2018-10-24 12:17:55,450 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 258 transitions. Word has length 246 [2018-10-24 12:17:55,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:55,451 INFO L481 AbstractCegarLoop]: Abstraction has 257 states and 258 transitions. [2018-10-24 12:17:55,451 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:17:55,451 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 258 transitions. [2018-10-24 12:17:55,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2018-10-24 12:17:55,452 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:55,452 INFO L375 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 25, 24, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:55,453 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:55,453 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:55,453 INFO L82 PathProgramCache]: Analyzing trace with hash -1899076537, now seen corresponding path program 47 times [2018-10-24 12:17:55,453 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:55,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:55,454 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:55,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:55,454 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:55,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:57,350 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-24 12:17:57,350 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:57,350 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:57,350 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:57,350 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:57,351 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:57,351 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:57,359 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:17:57,359 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:17:57,457 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-10-24 12:17:57,457 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:57,462 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:58,578 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-24 12:17:58,578 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:59,475 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-24 12:17:59,511 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:59,512 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 78 [2018-10-24 12:17:59,512 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:59,512 INFO L460 AbstractCegarLoop]: Interpolant automaton has 78 states [2018-10-24 12:17:59,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2018-10-24 12:17:59,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1403, Invalid=4603, Unknown=0, NotChecked=0, Total=6006 [2018-10-24 12:17:59,514 INFO L87 Difference]: Start difference. First operand 257 states and 258 transitions. Second operand 78 states. [2018-10-24 12:18:02,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:02,105 INFO L93 Difference]: Finished difference Result 368 states and 394 transitions. [2018-10-24 12:18:02,105 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-24 12:18:02,106 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 254 [2018-10-24 12:18:02,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:02,107 INFO L225 Difference]: With dead ends: 368 [2018-10-24 12:18:02,107 INFO L226 Difference]: Without dead ends: 259 [2018-10-24 12:18:02,108 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 434 SyntacticMatches, 50 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4274 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=2482, Invalid=8230, Unknown=0, NotChecked=0, Total=10712 [2018-10-24 12:18:02,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2018-10-24 12:18:02,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 259. [2018-10-24 12:18:02,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2018-10-24 12:18:02,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 260 transitions. [2018-10-24 12:18:02,120 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 260 transitions. Word has length 254 [2018-10-24 12:18:02,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:02,120 INFO L481 AbstractCegarLoop]: Abstraction has 259 states and 260 transitions. [2018-10-24 12:18:02,120 INFO L482 AbstractCegarLoop]: Interpolant automaton has 78 states. [2018-10-24 12:18:02,120 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 260 transitions. [2018-10-24 12:18:02,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 257 [2018-10-24 12:18:02,122 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:02,122 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:02,122 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:02,122 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:02,122 INFO L82 PathProgramCache]: Analyzing trace with hash 1410392577, now seen corresponding path program 48 times [2018-10-24 12:18:02,123 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:02,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:02,123 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:02,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:02,123 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:02,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:02,590 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 697 proven. 1246 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2018-10-24 12:18:02,590 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:02,590 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:02,590 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:02,590 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:02,591 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:02,591 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 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:02,599 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:02,599 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:02,674 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:02,674 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:02,678 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:03,237 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 698 proven. 1176 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-24 12:18:03,238 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:03,827 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 698 proven. 1176 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-24 12:18:03,847 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:03,847 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 33 [2018-10-24 12:18:03,847 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:03,848 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:18:03,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:18:03,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=390, Invalid=666, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:18:03,848 INFO L87 Difference]: Start difference. First operand 259 states and 260 transitions. Second operand 33 states. [2018-10-24 12:18:04,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:04,210 INFO L93 Difference]: Finished difference Result 269 states and 270 transitions. [2018-10-24 12:18:04,210 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:18:04,210 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 256 [2018-10-24 12:18:04,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:04,213 INFO L225 Difference]: With dead ends: 269 [2018-10-24 12:18:04,213 INFO L226 Difference]: Without dead ends: 267 [2018-10-24 12:18:04,213 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 486 SyntacticMatches, 51 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 829 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=403, Invalid=787, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:18:04,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2018-10-24 12:18:04,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 267. [2018-10-24 12:18:04,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 267 states. [2018-10-24 12:18:04,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 268 transitions. [2018-10-24 12:18:04,225 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 268 transitions. Word has length 256 [2018-10-24 12:18:04,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:04,225 INFO L481 AbstractCegarLoop]: Abstraction has 267 states and 268 transitions. [2018-10-24 12:18:04,226 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:18:04,226 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 268 transitions. [2018-10-24 12:18:04,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2018-10-24 12:18:04,227 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:04,227 INFO L375 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 26, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:04,228 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:04,228 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:04,228 INFO L82 PathProgramCache]: Analyzing trace with hash -115603931, now seen corresponding path program 49 times [2018-10-24 12:18:04,228 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:04,229 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:04,229 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:04,229 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:04,229 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:04,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:05,956 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:18:05,956 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:05,956 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:05,957 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:05,957 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:05,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:05,957 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 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:05,964 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:05,964 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:06,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:06,044 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:07,540 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:18:07,540 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:08,481 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:18:08,501 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:08,501 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 81 [2018-10-24 12:18:08,501 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:08,502 INFO L460 AbstractCegarLoop]: Interpolant automaton has 81 states [2018-10-24 12:18:08,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2018-10-24 12:18:08,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1511, Invalid=4969, Unknown=0, NotChecked=0, Total=6480 [2018-10-24 12:18:08,503 INFO L87 Difference]: Start difference. First operand 267 states and 268 transitions. Second operand 81 states. [2018-10-24 12:18:10,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:10,530 INFO L93 Difference]: Finished difference Result 382 states and 409 transitions. [2018-10-24 12:18:10,538 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-24 12:18:10,538 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 264 [2018-10-24 12:18:10,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:10,539 INFO L225 Difference]: With dead ends: 382 [2018-10-24 12:18:10,540 INFO L226 Difference]: Without dead ends: 269 [2018-10-24 12:18:10,541 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 609 GetRequests, 451 SyntacticMatches, 52 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4627 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=2672, Invalid=8884, Unknown=0, NotChecked=0, Total=11556 [2018-10-24 12:18:10,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2018-10-24 12:18:10,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 269. [2018-10-24 12:18:10,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2018-10-24 12:18:10,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 270 transitions. [2018-10-24 12:18:10,552 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 270 transitions. Word has length 264 [2018-10-24 12:18:10,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:10,552 INFO L481 AbstractCegarLoop]: Abstraction has 269 states and 270 transitions. [2018-10-24 12:18:10,553 INFO L482 AbstractCegarLoop]: Interpolant automaton has 81 states. [2018-10-24 12:18:10,553 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 270 transitions. [2018-10-24 12:18:10,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2018-10-24 12:18:10,554 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:10,554 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:10,555 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:10,555 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:10,555 INFO L82 PathProgramCache]: Analyzing trace with hash 1833968479, now seen corresponding path program 50 times [2018-10-24 12:18:10,555 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:10,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:10,556 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:10,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:10,556 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:10,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:11,047 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 751 proven. 1348 refuted. 0 times theorem prover too weak. 1128 trivial. 0 not checked. [2018-10-24 12:18:11,047 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:11,047 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:11,047 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:11,047 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:11,048 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:11,048 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 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:11,056 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:11,056 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:11,159 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-24 12:18:11,159 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:11,164 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:11,258 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 752 proven. 1275 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:18:11,259 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:12,310 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 752 proven. 1275 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:18:12,330 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:12,330 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 34 [2018-10-24 12:18:12,330 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:12,331 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:18:12,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:18:12,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=418, Invalid=704, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:18:12,331 INFO L87 Difference]: Start difference. First operand 269 states and 270 transitions. Second operand 34 states. [2018-10-24 12:18:12,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:12,689 INFO L93 Difference]: Finished difference Result 279 states and 280 transitions. [2018-10-24 12:18:12,689 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-24 12:18:12,689 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 266 [2018-10-24 12:18:12,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:12,691 INFO L225 Difference]: With dead ends: 279 [2018-10-24 12:18:12,691 INFO L226 Difference]: Without dead ends: 277 [2018-10-24 12:18:12,692 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 505 SyntacticMatches, 53 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 888 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=431, Invalid=829, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:18:12,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2018-10-24 12:18:12,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 277. [2018-10-24 12:18:12,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 277 states. [2018-10-24 12:18:12,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 278 transitions. [2018-10-24 12:18:12,703 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 278 transitions. Word has length 266 [2018-10-24 12:18:12,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:12,704 INFO L481 AbstractCegarLoop]: Abstraction has 277 states and 278 transitions. [2018-10-24 12:18:12,704 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:18:12,704 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 278 transitions. [2018-10-24 12:18:12,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2018-10-24 12:18:12,705 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:12,706 INFO L375 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 27, 26, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:12,706 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:12,706 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:12,706 INFO L82 PathProgramCache]: Analyzing trace with hash 883624323, now seen corresponding path program 51 times [2018-10-24 12:18:12,706 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:12,707 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:12,707 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:12,707 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:12,707 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:12,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:13,921 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-24 12:18:13,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:13,922 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:13,922 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:13,922 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:13,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:13,922 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 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:13,929 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:13,929 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:14,010 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:14,010 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:14,015 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:15,320 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-24 12:18:15,320 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:16,326 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-24 12:18:16,347 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:16,348 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 84 [2018-10-24 12:18:16,348 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:16,348 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2018-10-24 12:18:16,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2018-10-24 12:18:16,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1623, Invalid=5349, Unknown=0, NotChecked=0, Total=6972 [2018-10-24 12:18:16,349 INFO L87 Difference]: Start difference. First operand 277 states and 278 transitions. Second operand 84 states. [2018-10-24 12:18:17,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:17,868 INFO L93 Difference]: Finished difference Result 396 states and 424 transitions. [2018-10-24 12:18:17,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-10-24 12:18:17,869 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 274 [2018-10-24 12:18:17,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:17,870 INFO L225 Difference]: With dead ends: 396 [2018-10-24 12:18:17,870 INFO L226 Difference]: Without dead ends: 279 [2018-10-24 12:18:17,871 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 632 GetRequests, 468 SyntacticMatches, 54 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4994 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=2869, Invalid=9563, Unknown=0, NotChecked=0, Total=12432 [2018-10-24 12:18:17,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2018-10-24 12:18:17,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 279. [2018-10-24 12:18:17,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 279 states. [2018-10-24 12:18:17,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 280 transitions. [2018-10-24 12:18:17,884 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 280 transitions. Word has length 274 [2018-10-24 12:18:17,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:17,885 INFO L481 AbstractCegarLoop]: Abstraction has 279 states and 280 transitions. [2018-10-24 12:18:17,885 INFO L482 AbstractCegarLoop]: Interpolant automaton has 84 states. [2018-10-24 12:18:17,885 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 280 transitions. [2018-10-24 12:18:17,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2018-10-24 12:18:17,886 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:17,887 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:17,887 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:17,887 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:17,887 INFO L82 PathProgramCache]: Analyzing trace with hash -1678809539, now seen corresponding path program 52 times [2018-10-24 12:18:17,887 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:17,888 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:17,888 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:17,888 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:17,888 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:17,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:18,447 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 807 proven. 1454 refuted. 0 times theorem prover too weak. 1225 trivial. 0 not checked. [2018-10-24 12:18:18,448 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:18,448 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:18,448 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:18,448 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:18,448 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:18,448 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 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:18,456 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:18,456 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:18,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:18,534 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:18,640 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 808 proven. 1378 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-24 12:18:18,641 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:19,322 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 808 proven. 1378 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-24 12:18:19,343 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:19,343 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 35 [2018-10-24 12:18:19,343 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:19,344 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 12:18:19,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 12:18:19,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=447, Invalid=743, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:18:19,344 INFO L87 Difference]: Start difference. First operand 279 states and 280 transitions. Second operand 35 states. [2018-10-24 12:18:19,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:19,715 INFO L93 Difference]: Finished difference Result 289 states and 290 transitions. [2018-10-24 12:18:19,715 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:18:19,715 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 276 [2018-10-24 12:18:19,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:19,717 INFO L225 Difference]: With dead ends: 289 [2018-10-24 12:18:19,717 INFO L226 Difference]: Without dead ends: 287 [2018-10-24 12:18:19,717 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 614 GetRequests, 524 SyntacticMatches, 55 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 949 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=460, Invalid=872, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:18:19,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2018-10-24 12:18:19,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 287. [2018-10-24 12:18:19,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2018-10-24 12:18:19,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 288 transitions. [2018-10-24 12:18:19,729 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 288 transitions. Word has length 276 [2018-10-24 12:18:19,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:19,729 INFO L481 AbstractCegarLoop]: Abstraction has 287 states and 288 transitions. [2018-10-24 12:18:19,729 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 12:18:19,729 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 288 transitions. [2018-10-24 12:18:19,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2018-10-24 12:18:19,731 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:19,731 INFO L375 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 28, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:19,731 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:19,732 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:19,732 INFO L82 PathProgramCache]: Analyzing trace with hash -1941926303, now seen corresponding path program 53 times [2018-10-24 12:18:19,732 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:19,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:19,733 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:19,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:19,733 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:19,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:21,087 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:18:21,088 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:21,088 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:21,088 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:21,088 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:21,088 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:21,088 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 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:21,097 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:21,097 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:21,208 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-10-24 12:18:21,209 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:21,215 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:22,726 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:18:22,727 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:23,765 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:18:23,786 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:23,786 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 87 [2018-10-24 12:18:23,786 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:23,786 INFO L460 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-10-24 12:18:23,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-10-24 12:18:23,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1739, Invalid=5743, Unknown=0, NotChecked=0, Total=7482 [2018-10-24 12:18:23,788 INFO L87 Difference]: Start difference. First operand 287 states and 288 transitions. Second operand 87 states. [2018-10-24 12:18:25,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:25,061 INFO L93 Difference]: Finished difference Result 410 states and 439 transitions. [2018-10-24 12:18:25,061 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-24 12:18:25,062 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 284 [2018-10-24 12:18:25,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:25,063 INFO L225 Difference]: With dead ends: 410 [2018-10-24 12:18:25,063 INFO L226 Difference]: Without dead ends: 289 [2018-10-24 12:18:25,064 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 655 GetRequests, 485 SyntacticMatches, 56 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5375 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=3073, Invalid=10267, Unknown=0, NotChecked=0, Total=13340 [2018-10-24 12:18:25,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2018-10-24 12:18:25,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2018-10-24 12:18:25,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 289 states. [2018-10-24 12:18:25,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 290 transitions. [2018-10-24 12:18:25,077 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 290 transitions. Word has length 284 [2018-10-24 12:18:25,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:25,077 INFO L481 AbstractCegarLoop]: Abstraction has 289 states and 290 transitions. [2018-10-24 12:18:25,077 INFO L482 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-10-24 12:18:25,078 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 290 transitions. [2018-10-24 12:18:25,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2018-10-24 12:18:25,079 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:25,079 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 28, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:25,080 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:25,080 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:25,080 INFO L82 PathProgramCache]: Analyzing trace with hash 216779419, now seen corresponding path program 54 times [2018-10-24 12:18:25,080 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:25,081 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:25,081 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:25,081 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:25,081 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:25,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:25,592 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 865 proven. 1564 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2018-10-24 12:18:25,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:25,593 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:25,593 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:25,593 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:25,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:25,593 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 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:25,601 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:25,601 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:25,678 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:25,679 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:25,685 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:25,794 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 866 proven. 1485 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:18:25,794 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:26,505 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 866 proven. 1485 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:18:26,526 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:26,527 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33] total 36 [2018-10-24 12:18:26,527 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:26,527 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:18:26,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:18:26,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=783, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:18:26,528 INFO L87 Difference]: Start difference. First operand 289 states and 290 transitions. Second operand 36 states. [2018-10-24 12:18:26,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:26,867 INFO L93 Difference]: Finished difference Result 299 states and 300 transitions. [2018-10-24 12:18:26,868 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:18:26,868 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 286 [2018-10-24 12:18:26,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:26,870 INFO L225 Difference]: With dead ends: 299 [2018-10-24 12:18:26,870 INFO L226 Difference]: Without dead ends: 297 [2018-10-24 12:18:26,870 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 636 GetRequests, 543 SyntacticMatches, 57 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1012 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=490, Invalid=916, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:18:26,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2018-10-24 12:18:26,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 297. [2018-10-24 12:18:26,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 297 states. [2018-10-24 12:18:26,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 298 transitions. [2018-10-24 12:18:26,882 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 298 transitions. Word has length 286 [2018-10-24 12:18:26,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:26,883 INFO L481 AbstractCegarLoop]: Abstraction has 297 states and 298 transitions. [2018-10-24 12:18:26,883 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:18:26,883 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 298 transitions. [2018-10-24 12:18:26,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2018-10-24 12:18:26,885 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:26,885 INFO L375 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 29, 28, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:26,885 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:26,885 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:26,885 INFO L82 PathProgramCache]: Analyzing trace with hash 1840886975, now seen corresponding path program 55 times [2018-10-24 12:18:26,886 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:26,886 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:26,886 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:26,886 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:26,886 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:26,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:28,340 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-24 12:18:28,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:28,341 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:28,341 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:28,341 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:28,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:28,341 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 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:28,349 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:28,350 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:28,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:28,437 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:29,862 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-24 12:18:29,863 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:31,073 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-24 12:18:31,093 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:31,094 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 90 [2018-10-24 12:18:31,094 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:31,094 INFO L460 AbstractCegarLoop]: Interpolant automaton has 90 states [2018-10-24 12:18:31,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2018-10-24 12:18:31,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1859, Invalid=6151, Unknown=0, NotChecked=0, Total=8010 [2018-10-24 12:18:31,095 INFO L87 Difference]: Start difference. First operand 297 states and 298 transitions. Second operand 90 states. [2018-10-24 12:18:33,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:33,198 INFO L93 Difference]: Finished difference Result 424 states and 454 transitions. [2018-10-24 12:18:33,198 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-24 12:18:33,198 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 294 [2018-10-24 12:18:33,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:33,199 INFO L225 Difference]: With dead ends: 424 [2018-10-24 12:18:33,199 INFO L226 Difference]: Without dead ends: 299 [2018-10-24 12:18:33,201 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 678 GetRequests, 502 SyntacticMatches, 58 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5770 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3284, Invalid=10996, Unknown=0, NotChecked=0, Total=14280 [2018-10-24 12:18:33,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2018-10-24 12:18:33,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 299. [2018-10-24 12:18:33,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 299 states. [2018-10-24 12:18:33,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 300 transitions. [2018-10-24 12:18:33,214 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 300 transitions. Word has length 294 [2018-10-24 12:18:33,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:33,214 INFO L481 AbstractCegarLoop]: Abstraction has 299 states and 300 transitions. [2018-10-24 12:18:33,214 INFO L482 AbstractCegarLoop]: Interpolant automaton has 90 states. [2018-10-24 12:18:33,214 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 300 transitions. [2018-10-24 12:18:33,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2018-10-24 12:18:33,216 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:33,216 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:33,216 INFO L424 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:33,217 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:33,217 INFO L82 PathProgramCache]: Analyzing trace with hash -1436913543, now seen corresponding path program 56 times [2018-10-24 12:18:33,217 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:33,217 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:33,218 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:33,218 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:33,218 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:33,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:34,019 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 925 proven. 1678 refuted. 0 times theorem prover too weak. 1431 trivial. 0 not checked. [2018-10-24 12:18:34,019 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:34,020 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:34,020 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:34,020 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:34,020 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:34,020 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 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:34,027 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:34,028 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:34,146 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-24 12:18:34,146 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:34,151 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:34,264 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 926 proven. 1596 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-24 12:18:34,264 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:35,009 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 926 proven. 1596 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-24 12:18:35,030 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:35,030 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 37 [2018-10-24 12:18:35,030 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:35,030 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-24 12:18:35,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-24 12:18:35,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=508, Invalid=824, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:18:35,031 INFO L87 Difference]: Start difference. First operand 299 states and 300 transitions. Second operand 37 states. [2018-10-24 12:18:35,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:35,458 INFO L93 Difference]: Finished difference Result 309 states and 310 transitions. [2018-10-24 12:18:35,458 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-24 12:18:35,459 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 296 [2018-10-24 12:18:35,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:35,460 INFO L225 Difference]: With dead ends: 309 [2018-10-24 12:18:35,461 INFO L226 Difference]: Without dead ends: 307 [2018-10-24 12:18:35,461 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 658 GetRequests, 562 SyntacticMatches, 59 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1077 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=521, Invalid=961, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:18:35,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2018-10-24 12:18:35,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 307. [2018-10-24 12:18:35,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 307 states. [2018-10-24 12:18:35,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 308 transitions. [2018-10-24 12:18:35,471 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 308 transitions. Word has length 296 [2018-10-24 12:18:35,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:35,471 INFO L481 AbstractCegarLoop]: Abstraction has 307 states and 308 transitions. [2018-10-24 12:18:35,472 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-24 12:18:35,472 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 308 transitions. [2018-10-24 12:18:35,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2018-10-24 12:18:35,473 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:35,473 INFO L375 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 30, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:35,473 INFO L424 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:35,473 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:35,473 INFO L82 PathProgramCache]: Analyzing trace with hash 1812700317, now seen corresponding path program 57 times [2018-10-24 12:18:35,474 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:35,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:35,474 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:35,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:35,474 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:35,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:36,761 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:18:36,761 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:36,761 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:36,761 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:36,761 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:36,761 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:36,761 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 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:36,769 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:36,769 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:36,858 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:36,858 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:36,863 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:38,665 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:18:38,665 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:39,857 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:18:39,880 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:39,880 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 93 [2018-10-24 12:18:39,880 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:39,881 INFO L460 AbstractCegarLoop]: Interpolant automaton has 93 states [2018-10-24 12:18:39,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2018-10-24 12:18:39,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1983, Invalid=6573, Unknown=0, NotChecked=0, Total=8556 [2018-10-24 12:18:39,882 INFO L87 Difference]: Start difference. First operand 307 states and 308 transitions. Second operand 93 states. [2018-10-24 12:18:41,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:41,822 INFO L93 Difference]: Finished difference Result 438 states and 469 transitions. [2018-10-24 12:18:41,822 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-24 12:18:41,822 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 304 [2018-10-24 12:18:41,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:41,823 INFO L225 Difference]: With dead ends: 438 [2018-10-24 12:18:41,823 INFO L226 Difference]: Without dead ends: 309 [2018-10-24 12:18:41,824 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 701 GetRequests, 519 SyntacticMatches, 60 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6179 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=3502, Invalid=11750, Unknown=0, NotChecked=0, Total=15252 [2018-10-24 12:18:41,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2018-10-24 12:18:41,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 309. [2018-10-24 12:18:41,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 309 states. [2018-10-24 12:18:41,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 310 transitions. [2018-10-24 12:18:41,834 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 310 transitions. Word has length 304 [2018-10-24 12:18:41,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:41,834 INFO L481 AbstractCegarLoop]: Abstraction has 309 states and 310 transitions. [2018-10-24 12:18:41,834 INFO L482 AbstractCegarLoop]: Interpolant automaton has 93 states. [2018-10-24 12:18:41,834 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 310 transitions. [2018-10-24 12:18:41,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2018-10-24 12:18:41,836 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:41,836 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 30, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:41,837 INFO L424 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:41,837 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:41,837 INFO L82 PathProgramCache]: Analyzing trace with hash -1654097961, now seen corresponding path program 58 times [2018-10-24 12:18:41,837 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:41,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:41,838 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:41,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:41,838 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:41,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:42,831 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 987 proven. 1796 refuted. 0 times theorem prover too weak. 1540 trivial. 0 not checked. [2018-10-24 12:18:42,831 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:42,831 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:42,831 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:42,831 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:42,831 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:42,831 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 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:42,840 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:42,840 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:42,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:42,933 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:43,050 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 988 proven. 1711 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:18:43,050 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:43,829 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 988 proven. 1711 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:18:43,850 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:43,850 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 38 [2018-10-24 12:18:43,850 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:43,850 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:18:43,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:18:43,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=866, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:18:43,851 INFO L87 Difference]: Start difference. First operand 309 states and 310 transitions. Second operand 38 states. [2018-10-24 12:18:44,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:44,297 INFO L93 Difference]: Finished difference Result 319 states and 320 transitions. [2018-10-24 12:18:44,297 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-24 12:18:44,297 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 306 [2018-10-24 12:18:44,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:44,299 INFO L225 Difference]: With dead ends: 319 [2018-10-24 12:18:44,299 INFO L226 Difference]: Without dead ends: 317 [2018-10-24 12:18:44,300 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 680 GetRequests, 581 SyntacticMatches, 61 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1144 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=553, Invalid=1007, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:18:44,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2018-10-24 12:18:44,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 317. [2018-10-24 12:18:44,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 317 states. [2018-10-24 12:18:44,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 318 transitions. [2018-10-24 12:18:44,309 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 318 transitions. Word has length 306 [2018-10-24 12:18:44,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:44,309 INFO L481 AbstractCegarLoop]: Abstraction has 317 states and 318 transitions. [2018-10-24 12:18:44,309 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:18:44,309 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 318 transitions. [2018-10-24 12:18:44,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2018-10-24 12:18:44,311 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:44,311 INFO L375 BasicCegarLoop]: trace histogram [31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:44,311 INFO L424 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:44,311 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:44,312 INFO L82 PathProgramCache]: Analyzing trace with hash -1052547589, now seen corresponding path program 59 times [2018-10-24 12:18:44,312 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:44,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:44,312 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:44,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:44,313 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:44,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:45,850 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-24 12:18:45,850 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:45,851 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:45,851 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:45,851 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:45,851 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:45,851 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 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:45,859 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:45,859 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:45,992 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2018-10-24 12:18:45,992 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:45,997 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:47,934 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-24 12:18:47,934 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:49,148 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-24 12:18:49,183 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:49,183 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 96 [2018-10-24 12:18:49,183 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:49,184 INFO L460 AbstractCegarLoop]: Interpolant automaton has 96 states [2018-10-24 12:18:49,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2018-10-24 12:18:49,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2111, Invalid=7009, Unknown=0, NotChecked=0, Total=9120 [2018-10-24 12:18:49,185 INFO L87 Difference]: Start difference. First operand 317 states and 318 transitions. Second operand 96 states. [2018-10-24 12:18:51,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:51,252 INFO L93 Difference]: Finished difference Result 452 states and 484 transitions. [2018-10-24 12:18:51,252 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-24 12:18:51,253 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 314 [2018-10-24 12:18:51,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:51,254 INFO L225 Difference]: With dead ends: 452 [2018-10-24 12:18:51,254 INFO L226 Difference]: Without dead ends: 319 [2018-10-24 12:18:51,256 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 724 GetRequests, 536 SyntacticMatches, 62 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6602 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=3727, Invalid=12529, Unknown=0, NotChecked=0, Total=16256 [2018-10-24 12:18:51,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2018-10-24 12:18:51,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 319. [2018-10-24 12:18:51,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 319 states. [2018-10-24 12:18:51,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 320 transitions. [2018-10-24 12:18:51,269 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 320 transitions. Word has length 314 [2018-10-24 12:18:51,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:51,269 INFO L481 AbstractCegarLoop]: Abstraction has 319 states and 320 transitions. [2018-10-24 12:18:51,269 INFO L482 AbstractCegarLoop]: Interpolant automaton has 96 states. [2018-10-24 12:18:51,270 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 320 transitions. [2018-10-24 12:18:51,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2018-10-24 12:18:51,271 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:51,271 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 31, 31, 31, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:51,271 INFO L424 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:51,271 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:51,271 INFO L82 PathProgramCache]: Analyzing trace with hash 1348141237, now seen corresponding path program 60 times [2018-10-24 12:18:51,272 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:51,272 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:51,272 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:51,272 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:51,272 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:51,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:51,973 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1051 proven. 1918 refuted. 0 times theorem prover too weak. 1653 trivial. 0 not checked. [2018-10-24 12:18:51,973 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:51,973 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:51,973 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:51,973 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:51,973 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:51,973 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 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:51,981 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:51,981 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:52,073 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:52,074 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:52,078 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:52,191 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1052 proven. 1830 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-24 12:18:52,191 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:53,357 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1052 proven. 1830 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-24 12:18:53,378 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:53,378 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36, 36] total 39 [2018-10-24 12:18:53,378 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:53,378 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:18:53,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:18:53,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=909, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:18:53,379 INFO L87 Difference]: Start difference. First operand 319 states and 320 transitions. Second operand 39 states. [2018-10-24 12:18:53,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:53,871 INFO L93 Difference]: Finished difference Result 329 states and 330 transitions. [2018-10-24 12:18:53,872 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-24 12:18:53,872 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 316 [2018-10-24 12:18:53,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:53,874 INFO L225 Difference]: With dead ends: 329 [2018-10-24 12:18:53,874 INFO L226 Difference]: Without dead ends: 327 [2018-10-24 12:18:53,875 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 702 GetRequests, 600 SyntacticMatches, 63 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1213 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=586, Invalid=1054, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:18:53,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2018-10-24 12:18:53,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 327. [2018-10-24 12:18:53,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 327 states. [2018-10-24 12:18:53,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 328 transitions. [2018-10-24 12:18:53,884 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 328 transitions. Word has length 316 [2018-10-24 12:18:53,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:53,884 INFO L481 AbstractCegarLoop]: Abstraction has 327 states and 328 transitions. [2018-10-24 12:18:53,884 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:18:53,885 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 328 transitions. [2018-10-24 12:18:53,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2018-10-24 12:18:53,886 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:53,886 INFO L375 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 32, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:53,886 INFO L424 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:53,886 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:53,886 INFO L82 PathProgramCache]: Analyzing trace with hash 1350971609, now seen corresponding path program 61 times [2018-10-24 12:18:53,887 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:53,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:53,887 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:53,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:53,887 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:53,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:55,344 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:18:55,344 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:55,344 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:55,344 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:55,345 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:55,345 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:55,345 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 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:55,352 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:55,352 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:55,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:55,438 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:57,283 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:18:57,283 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:58,908 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:18:58,928 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:58,929 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 99 [2018-10-24 12:18:58,929 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:58,929 INFO L460 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-10-24 12:18:58,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-10-24 12:18:58,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2243, Invalid=7459, Unknown=0, NotChecked=0, Total=9702 [2018-10-24 12:18:58,931 INFO L87 Difference]: Start difference. First operand 327 states and 328 transitions. Second operand 99 states. [2018-10-24 12:19:01,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:01,229 INFO L93 Difference]: Finished difference Result 466 states and 499 transitions. [2018-10-24 12:19:01,229 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-24 12:19:01,229 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 324 [2018-10-24 12:19:01,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:01,231 INFO L225 Difference]: With dead ends: 466 [2018-10-24 12:19:01,231 INFO L226 Difference]: Without dead ends: 329 [2018-10-24 12:19:01,233 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 747 GetRequests, 553 SyntacticMatches, 64 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7039 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=3959, Invalid=13333, Unknown=0, NotChecked=0, Total=17292 [2018-10-24 12:19:01,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2018-10-24 12:19:01,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 329. [2018-10-24 12:19:01,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 329 states. [2018-10-24 12:19:01,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 330 transitions. [2018-10-24 12:19:01,247 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 330 transitions. Word has length 324 [2018-10-24 12:19:01,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:01,247 INFO L481 AbstractCegarLoop]: Abstraction has 329 states and 330 transitions. [2018-10-24 12:19:01,247 INFO L482 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-10-24 12:19:01,247 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 330 transitions. [2018-10-24 12:19:01,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2018-10-24 12:19:01,249 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:01,250 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:01,250 INFO L424 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:01,250 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:01,250 INFO L82 PathProgramCache]: Analyzing trace with hash -259052781, now seen corresponding path program 62 times [2018-10-24 12:19:01,250 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:01,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:01,251 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:01,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:01,251 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:01,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:01,945 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1117 proven. 2044 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2018-10-24 12:19:01,945 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:01,945 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:01,945 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:01,946 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:01,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:01,946 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 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:01,955 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:19:01,955 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:19:02,105 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-10-24 12:19:02,105 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:02,110 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:02,258 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1118 proven. 1953 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:19:02,258 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:03,517 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1118 proven. 1953 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:19:03,539 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:03,539 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37] total 40 [2018-10-24 12:19:03,539 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:03,539 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-24 12:19:03,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-24 12:19:03,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=607, Invalid=953, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:19:03,540 INFO L87 Difference]: Start difference. First operand 329 states and 330 transitions. Second operand 40 states. [2018-10-24 12:19:03,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:03,965 INFO L93 Difference]: Finished difference Result 339 states and 340 transitions. [2018-10-24 12:19:03,965 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:19:03,966 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 326 [2018-10-24 12:19:03,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:03,968 INFO L225 Difference]: With dead ends: 339 [2018-10-24 12:19:03,968 INFO L226 Difference]: Without dead ends: 337 [2018-10-24 12:19:03,969 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 724 GetRequests, 619 SyntacticMatches, 65 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1284 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=620, Invalid=1102, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:19:03,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2018-10-24 12:19:03,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 337. [2018-10-24 12:19:03,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 337 states. [2018-10-24 12:19:03,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 338 transitions. [2018-10-24 12:19:03,984 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 338 transitions. Word has length 326 [2018-10-24 12:19:03,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:03,985 INFO L481 AbstractCegarLoop]: Abstraction has 337 states and 338 transitions. [2018-10-24 12:19:03,985 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-24 12:19:03,985 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 338 transitions. [2018-10-24 12:19:03,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2018-10-24 12:19:03,987 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:03,988 INFO L375 BasicCegarLoop]: trace histogram [33, 33, 33, 33, 33, 32, 32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:03,988 INFO L424 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:03,988 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:03,988 INFO L82 PathProgramCache]: Analyzing trace with hash 672210231, now seen corresponding path program 63 times [2018-10-24 12:19:03,988 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:03,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:03,989 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:03,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:03,989 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:04,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:05,616 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-24 12:19:05,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:05,616 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:05,616 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:05,616 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:05,617 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:05,617 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 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:05,627 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:19:05,627 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:19:05,727 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:19:05,727 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:05,733 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:07,502 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-24 12:19:07,502 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:09,156 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-24 12:19:09,177 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:09,177 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 102 [2018-10-24 12:19:09,178 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:09,178 INFO L460 AbstractCegarLoop]: Interpolant automaton has 102 states [2018-10-24 12:19:09,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2018-10-24 12:19:09,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2379, Invalid=7923, Unknown=0, NotChecked=0, Total=10302 [2018-10-24 12:19:09,179 INFO L87 Difference]: Start difference. First operand 337 states and 338 transitions. Second operand 102 states. [2018-10-24 12:19:11,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:11,431 INFO L93 Difference]: Finished difference Result 480 states and 514 transitions. [2018-10-24 12:19:11,431 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-24 12:19:11,431 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 334 [2018-10-24 12:19:11,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:11,433 INFO L225 Difference]: With dead ends: 480 [2018-10-24 12:19:11,433 INFO L226 Difference]: Without dead ends: 339 [2018-10-24 12:19:11,435 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 770 GetRequests, 570 SyntacticMatches, 66 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7490 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=4198, Invalid=14162, Unknown=0, NotChecked=0, Total=18360 [2018-10-24 12:19:11,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2018-10-24 12:19:11,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 339. [2018-10-24 12:19:11,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 339 states. [2018-10-24 12:19:11,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 339 states to 339 states and 340 transitions. [2018-10-24 12:19:11,446 INFO L78 Accepts]: Start accepts. Automaton has 339 states and 340 transitions. Word has length 334 [2018-10-24 12:19:11,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:11,446 INFO L481 AbstractCegarLoop]: Abstraction has 339 states and 340 transitions. [2018-10-24 12:19:11,446 INFO L482 AbstractCegarLoop]: Interpolant automaton has 102 states. [2018-10-24 12:19:11,446 INFO L276 IsEmpty]: Start isEmpty. Operand 339 states and 340 transitions. [2018-10-24 12:19:11,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2018-10-24 12:19:11,447 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:11,447 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 33, 33, 33, 32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:11,448 INFO L424 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:11,448 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:11,448 INFO L82 PathProgramCache]: Analyzing trace with hash 1887049457, now seen corresponding path program 64 times [2018-10-24 12:19:11,448 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:11,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:11,449 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:11,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:11,449 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:11,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:12,142 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1185 proven. 2174 refuted. 0 times theorem prover too weak. 1891 trivial. 0 not checked. [2018-10-24 12:19:12,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:12,142 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:12,142 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:12,143 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:12,143 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:12,143 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 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:12,151 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:12,151 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:19:12,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:12,251 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:12,377 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1186 proven. 2080 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-24 12:19:12,377 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:13,510 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1186 proven. 2080 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-24 12:19:13,530 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:13,531 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 41 [2018-10-24 12:19:13,531 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:13,531 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-24 12:19:13,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-24 12:19:13,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=642, Invalid=998, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:19:13,532 INFO L87 Difference]: Start difference. First operand 339 states and 340 transitions. Second operand 41 states. [2018-10-24 12:19:14,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:14,013 INFO L93 Difference]: Finished difference Result 349 states and 350 transitions. [2018-10-24 12:19:14,013 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-24 12:19:14,014 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 336 [2018-10-24 12:19:14,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:14,016 INFO L225 Difference]: With dead ends: 349 [2018-10-24 12:19:14,016 INFO L226 Difference]: Without dead ends: 347 [2018-10-24 12:19:14,017 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 746 GetRequests, 638 SyntacticMatches, 67 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1357 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=655, Invalid=1151, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:19:14,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2018-10-24 12:19:14,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 347. [2018-10-24 12:19:14,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 347 states. [2018-10-24 12:19:14,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 347 states to 347 states and 348 transitions. [2018-10-24 12:19:14,030 INFO L78 Accepts]: Start accepts. Automaton has 347 states and 348 transitions. Word has length 336 [2018-10-24 12:19:14,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:14,030 INFO L481 AbstractCegarLoop]: Abstraction has 347 states and 348 transitions. [2018-10-24 12:19:14,030 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-24 12:19:14,031 INFO L276 IsEmpty]: Start isEmpty. Operand 347 states and 348 transitions. [2018-10-24 12:19:14,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2018-10-24 12:19:14,032 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:14,033 INFO L375 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 34, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:14,033 INFO L424 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:14,033 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:14,033 INFO L82 PathProgramCache]: Analyzing trace with hash -2093397227, now seen corresponding path program 65 times [2018-10-24 12:19:14,033 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:14,034 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:14,034 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:14,034 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:14,034 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:14,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:15,998 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:19:15,998 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:15,998 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:15,999 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:15,999 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:15,999 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:15,999 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 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:16,008 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:19:16,008 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:19:16,147 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-10-24 12:19:16,148 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:16,153 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:18,038 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:19:18,038 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:19,834 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:19:19,855 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:19,855 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 105 [2018-10-24 12:19:19,855 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:19,856 INFO L460 AbstractCegarLoop]: Interpolant automaton has 105 states [2018-10-24 12:19:19,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2018-10-24 12:19:19,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2519, Invalid=8401, Unknown=0, NotChecked=0, Total=10920 [2018-10-24 12:19:19,857 INFO L87 Difference]: Start difference. First operand 347 states and 348 transitions. Second operand 105 states. [2018-10-24 12:19:22,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:22,284 INFO L93 Difference]: Finished difference Result 494 states and 529 transitions. [2018-10-24 12:19:22,285 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-10-24 12:19:22,285 INFO L78 Accepts]: Start accepts. Automaton has 105 states. Word has length 344 [2018-10-24 12:19:22,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:22,286 INFO L225 Difference]: With dead ends: 494 [2018-10-24 12:19:22,286 INFO L226 Difference]: Without dead ends: 349 [2018-10-24 12:19:22,288 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 793 GetRequests, 587 SyntacticMatches, 68 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7955 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=4444, Invalid=15016, Unknown=0, NotChecked=0, Total=19460 [2018-10-24 12:19:22,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2018-10-24 12:19:22,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 349. [2018-10-24 12:19:22,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 349 states. [2018-10-24 12:19:22,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 350 transitions. [2018-10-24 12:19:22,322 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 350 transitions. Word has length 344 [2018-10-24 12:19:22,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:22,322 INFO L481 AbstractCegarLoop]: Abstraction has 349 states and 350 transitions. [2018-10-24 12:19:22,323 INFO L482 AbstractCegarLoop]: Interpolant automaton has 105 states. [2018-10-24 12:19:22,323 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 350 transitions. [2018-10-24 12:19:22,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2018-10-24 12:19:22,324 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:22,324 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 34, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:22,324 INFO L424 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:22,324 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:22,325 INFO L82 PathProgramCache]: Analyzing trace with hash 162063439, now seen corresponding path program 66 times [2018-10-24 12:19:22,325 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:22,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:22,325 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:22,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:22,325 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:22,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:23,152 INFO L134 CoverageAnalysis]: Checked inductivity of 5579 backedges. 1255 proven. 2308 refuted. 0 times theorem prover too weak. 2016 trivial. 0 not checked. [2018-10-24 12:19:23,152 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:23,152 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:23,152 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:23,152 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:23,152 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:23,153 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 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:23,160 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:19:23,160 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:19:23,266 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:19:23,267 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:23,272 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:23,535 INFO L134 CoverageAnalysis]: Checked inductivity of 5579 backedges. 1256 proven. 2211 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:19:23,536 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:24,647 INFO L134 CoverageAnalysis]: Checked inductivity of 5579 backedges. 1256 proven. 2211 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:19:24,668 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:24,668 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39] total 42 [2018-10-24 12:19:24,668 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:24,669 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:19:24,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:19:24,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=678, Invalid=1044, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:19:24,669 INFO L87 Difference]: Start difference. First operand 349 states and 350 transitions. Second operand 42 states. [2018-10-24 12:19:25,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:25,115 INFO L93 Difference]: Finished difference Result 359 states and 360 transitions. [2018-10-24 12:19:25,115 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:19:25,115 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 346 [2018-10-24 12:19:25,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:25,118 INFO L225 Difference]: With dead ends: 359 [2018-10-24 12:19:25,118 INFO L226 Difference]: Without dead ends: 357 [2018-10-24 12:19:25,118 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 768 GetRequests, 657 SyntacticMatches, 69 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1432 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=691, Invalid=1201, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:19:25,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2018-10-24 12:19:25,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 357. [2018-10-24 12:19:25,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 357 states. [2018-10-24 12:19:25,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 357 states to 357 states and 358 transitions. [2018-10-24 12:19:25,130 INFO L78 Accepts]: Start accepts. Automaton has 357 states and 358 transitions. Word has length 346 [2018-10-24 12:19:25,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:25,130 INFO L481 AbstractCegarLoop]: Abstraction has 357 states and 358 transitions. [2018-10-24 12:19:25,130 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:19:25,130 INFO L276 IsEmpty]: Start isEmpty. Operand 357 states and 358 transitions. [2018-10-24 12:19:25,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 355 [2018-10-24 12:19:25,132 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:25,132 INFO L375 BasicCegarLoop]: trace histogram [35, 35, 35, 35, 35, 34, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:25,133 INFO L424 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:25,133 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:25,133 INFO L82 PathProgramCache]: Analyzing trace with hash 1282136691, now seen corresponding path program 67 times [2018-10-24 12:19:25,133 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:25,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:25,134 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:25,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:25,134 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:25,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:26,758 INFO L134 CoverageAnalysis]: Checked inductivity of 5848 backedges. 2414 proven. 1190 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-10-24 12:19:26,758 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:26,758 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:26,759 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:26,759 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:26,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:26,759 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 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:26,766 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:26,766 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:19:26,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:26,861 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:29,145 INFO L134 CoverageAnalysis]: Checked inductivity of 5848 backedges. 2414 proven. 1190 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-10-24 12:19:29,145 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:30,743 INFO L134 CoverageAnalysis]: Checked inductivity of 5848 backedges. 2414 proven. 1190 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-10-24 12:19:30,763 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:30,763 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 108 [2018-10-24 12:19:30,764 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:30,764 INFO L460 AbstractCegarLoop]: Interpolant automaton has 108 states [2018-10-24 12:19:30,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2018-10-24 12:19:30,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2663, Invalid=8893, Unknown=0, NotChecked=0, Total=11556 [2018-10-24 12:19:30,766 INFO L87 Difference]: Start difference. First operand 357 states and 358 transitions. Second operand 108 states. [2018-10-24 12:19:33,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:33,237 INFO L93 Difference]: Finished difference Result 508 states and 544 transitions. [2018-10-24 12:19:33,238 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-10-24 12:19:33,238 INFO L78 Accepts]: Start accepts. Automaton has 108 states. Word has length 354 [2018-10-24 12:19:33,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:33,239 INFO L225 Difference]: With dead ends: 508 [2018-10-24 12:19:33,239 INFO L226 Difference]: Without dead ends: 359 [2018-10-24 12:19:33,241 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 816 GetRequests, 604 SyntacticMatches, 70 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8434 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=4697, Invalid=15895, Unknown=0, NotChecked=0, Total=20592 [2018-10-24 12:19:33,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2018-10-24 12:19:33,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 359. [2018-10-24 12:19:33,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 359 states. [2018-10-24 12:19:33,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 360 transitions. [2018-10-24 12:19:33,253 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 360 transitions. Word has length 354 [2018-10-24 12:19:33,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:33,254 INFO L481 AbstractCegarLoop]: Abstraction has 359 states and 360 transitions. [2018-10-24 12:19:33,254 INFO L482 AbstractCegarLoop]: Interpolant automaton has 108 states. [2018-10-24 12:19:33,254 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 360 transitions. [2018-10-24 12:19:33,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 357 [2018-10-24 12:19:33,255 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:33,255 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 35, 35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:33,255 INFO L424 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:33,256 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:33,256 INFO L82 PathProgramCache]: Analyzing trace with hash 1052816173, now seen corresponding path program 68 times [2018-10-24 12:19:33,256 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:33,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:33,256 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:33,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:33,257 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:33,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:34,373 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 1327 proven. 2446 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-24 12:19:34,373 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:34,373 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:34,373 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:34,373 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:34,373 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:34,373 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 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:34,380 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:19:34,380 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:19:34,535 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-10-24 12:19:34,535 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:34,541 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:34,663 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 1328 proven. 2346 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-10-24 12:19:34,663 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:35,687 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 1328 proven. 2346 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-10-24 12:19:35,708 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:35,708 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40, 40] total 43 [2018-10-24 12:19:35,708 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:35,709 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-24 12:19:35,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-24 12:19:35,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=715, Invalid=1091, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:19:35,709 INFO L87 Difference]: Start difference. First operand 359 states and 360 transitions. Second operand 43 states. [2018-10-24 12:19:36,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:36,193 INFO L93 Difference]: Finished difference Result 369 states and 370 transitions. [2018-10-24 12:19:36,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-24 12:19:36,194 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 356 [2018-10-24 12:19:36,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:36,196 INFO L225 Difference]: With dead ends: 369 [2018-10-24 12:19:36,196 INFO L226 Difference]: Without dead ends: 367 [2018-10-24 12:19:36,196 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 790 GetRequests, 676 SyntacticMatches, 71 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1509 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=728, Invalid=1252, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:19:36,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2018-10-24 12:19:36,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 367. [2018-10-24 12:19:36,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 367 states. [2018-10-24 12:19:36,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 368 transitions. [2018-10-24 12:19:36,207 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 368 transitions. Word has length 356 [2018-10-24 12:19:36,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:36,208 INFO L481 AbstractCegarLoop]: Abstraction has 367 states and 368 transitions. [2018-10-24 12:19:36,208 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-24 12:19:36,208 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 368 transitions. [2018-10-24 12:19:36,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 365 [2018-10-24 12:19:36,209 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:36,209 INFO L375 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 36, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:36,210 INFO L424 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:36,210 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:36,210 INFO L82 PathProgramCache]: Analyzing trace with hash 523103057, now seen corresponding path program 69 times [2018-10-24 12:19:36,210 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:36,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:36,211 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:36,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:36,211 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:36,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:37,913 INFO L134 CoverageAnalysis]: Checked inductivity of 6195 backedges. 2555 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:19:37,914 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:37,914 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:37,914 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:37,914 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:37,914 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:37,914 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 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:37,921 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:19:37,922 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:19:38,025 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:19:38,026 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:38,032 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:40,457 INFO L134 CoverageAnalysis]: Checked inductivity of 6195 backedges. 2555 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:19:40,457 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:42,131 INFO L134 CoverageAnalysis]: Checked inductivity of 6195 backedges. 2555 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:19:42,152 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:42,152 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 111 [2018-10-24 12:19:42,152 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:42,153 INFO L460 AbstractCegarLoop]: Interpolant automaton has 111 states [2018-10-24 12:19:42,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2018-10-24 12:19:42,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2811, Invalid=9399, Unknown=0, NotChecked=0, Total=12210 [2018-10-24 12:19:42,154 INFO L87 Difference]: Start difference. First operand 367 states and 368 transitions. Second operand 111 states. [2018-10-24 12:19:44,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:44,932 INFO L93 Difference]: Finished difference Result 522 states and 559 transitions. [2018-10-24 12:19:44,933 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-10-24 12:19:44,933 INFO L78 Accepts]: Start accepts. Automaton has 111 states. Word has length 364 [2018-10-24 12:19:44,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:44,934 INFO L225 Difference]: With dead ends: 522 [2018-10-24 12:19:44,934 INFO L226 Difference]: Without dead ends: 369 [2018-10-24 12:19:44,936 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 839 GetRequests, 621 SyntacticMatches, 72 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8927 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=4957, Invalid=16799, Unknown=0, NotChecked=0, Total=21756 [2018-10-24 12:19:44,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2018-10-24 12:19:44,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 369. [2018-10-24 12:19:44,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 369 states. [2018-10-24 12:19:44,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 369 states to 369 states and 370 transitions. [2018-10-24 12:19:44,953 INFO L78 Accepts]: Start accepts. Automaton has 369 states and 370 transitions. Word has length 364 [2018-10-24 12:19:44,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:44,953 INFO L481 AbstractCegarLoop]: Abstraction has 369 states and 370 transitions. [2018-10-24 12:19:44,953 INFO L482 AbstractCegarLoop]: Interpolant automaton has 111 states. [2018-10-24 12:19:44,953 INFO L276 IsEmpty]: Start isEmpty. Operand 369 states and 370 transitions. [2018-10-24 12:19:44,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 367 [2018-10-24 12:19:44,955 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:44,956 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 36, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:44,956 INFO L424 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:44,956 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:44,956 INFO L82 PathProgramCache]: Analyzing trace with hash 1568580491, now seen corresponding path program 70 times [2018-10-24 12:19:44,956 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:44,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:44,957 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:44,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:44,957 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:44,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:45,706 INFO L134 CoverageAnalysis]: Checked inductivity of 6267 backedges. 1401 proven. 2588 refuted. 0 times theorem prover too weak. 2278 trivial. 0 not checked. [2018-10-24 12:19:45,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:45,707 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:45,707 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:45,707 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:45,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:45,707 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 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:45,714 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:45,714 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:19:45,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:45,820 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:45,960 INFO L134 CoverageAnalysis]: Checked inductivity of 6267 backedges. 1402 proven. 2485 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:19:45,961 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:47,076 INFO L134 CoverageAnalysis]: Checked inductivity of 6267 backedges. 1402 proven. 2485 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:19:47,097 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:47,097 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 44 [2018-10-24 12:19:47,097 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:47,097 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-24 12:19:47,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-24 12:19:47,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=753, Invalid=1139, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:19:47,098 INFO L87 Difference]: Start difference. First operand 369 states and 370 transitions. Second operand 44 states. [2018-10-24 12:19:47,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:47,573 INFO L93 Difference]: Finished difference Result 379 states and 380 transitions. [2018-10-24 12:19:47,574 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:19:47,574 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 366 [2018-10-24 12:19:47,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:47,576 INFO L225 Difference]: With dead ends: 379 [2018-10-24 12:19:47,577 INFO L226 Difference]: Without dead ends: 377 [2018-10-24 12:19:47,577 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 812 GetRequests, 695 SyntacticMatches, 73 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1588 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=766, Invalid=1304, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:19:47,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2018-10-24 12:19:47,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 377. [2018-10-24 12:19:47,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 377 states. [2018-10-24 12:19:47,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 378 transitions. [2018-10-24 12:19:47,593 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 378 transitions. Word has length 366 [2018-10-24 12:19:47,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:47,593 INFO L481 AbstractCegarLoop]: Abstraction has 377 states and 378 transitions. [2018-10-24 12:19:47,593 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-24 12:19:47,593 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 378 transitions. [2018-10-24 12:19:47,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2018-10-24 12:19:47,595 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:47,595 INFO L375 BasicCegarLoop]: trace histogram [37, 37, 37, 37, 37, 36, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:47,595 INFO L424 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:47,595 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:47,595 INFO L82 PathProgramCache]: Analyzing trace with hash -904094289, now seen corresponding path program 71 times [2018-10-24 12:19:47,595 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:47,596 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:47,596 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:47,596 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:47,596 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:47,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:49,399 INFO L134 CoverageAnalysis]: Checked inductivity of 6552 backedges. 2700 proven. 1332 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-10-24 12:19:49,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:49,400 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:49,400 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:49,400 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:49,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:49,400 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 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:49,409 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:19:49,409 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:19:49,566 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2018-10-24 12:19:49,566 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:49,572 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:51,786 INFO L134 CoverageAnalysis]: Checked inductivity of 6552 backedges. 2700 proven. 1332 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-10-24 12:19:51,786 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:53,521 INFO L134 CoverageAnalysis]: Checked inductivity of 6552 backedges. 2700 proven. 1332 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-10-24 12:19:53,542 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:53,543 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 114 [2018-10-24 12:19:53,543 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:53,543 INFO L460 AbstractCegarLoop]: Interpolant automaton has 114 states [2018-10-24 12:19:53,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2018-10-24 12:19:53,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2963, Invalid=9919, Unknown=0, NotChecked=0, Total=12882 [2018-10-24 12:19:53,544 INFO L87 Difference]: Start difference. First operand 377 states and 378 transitions. Second operand 114 states. [2018-10-24 12:19:56,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:56,417 INFO L93 Difference]: Finished difference Result 536 states and 574 transitions. [2018-10-24 12:19:56,417 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-10-24 12:19:56,417 INFO L78 Accepts]: Start accepts. Automaton has 114 states. Word has length 374 [2018-10-24 12:19:56,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:56,419 INFO L225 Difference]: With dead ends: 536 [2018-10-24 12:19:56,419 INFO L226 Difference]: Without dead ends: 379 [2018-10-24 12:19:56,420 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 862 GetRequests, 638 SyntacticMatches, 74 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9434 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=5224, Invalid=17728, Unknown=0, NotChecked=0, Total=22952 [2018-10-24 12:19:56,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2018-10-24 12:19:56,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 379. [2018-10-24 12:19:56,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 379 states. [2018-10-24 12:19:56,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 380 transitions. [2018-10-24 12:19:56,432 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 380 transitions. Word has length 374 [2018-10-24 12:19:56,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:56,433 INFO L481 AbstractCegarLoop]: Abstraction has 379 states and 380 transitions. [2018-10-24 12:19:56,433 INFO L482 AbstractCegarLoop]: Interpolant automaton has 114 states. [2018-10-24 12:19:56,433 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 380 transitions. [2018-10-24 12:19:56,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 377 [2018-10-24 12:19:56,434 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:56,435 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 37, 37, 37, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:56,435 INFO L424 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:56,435 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:56,435 INFO L82 PathProgramCache]: Analyzing trace with hash -2135435927, now seen corresponding path program 72 times [2018-10-24 12:19:56,435 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:56,435 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:56,436 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:56,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:56,436 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:56,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:57,166 INFO L134 CoverageAnalysis]: Checked inductivity of 6626 backedges. 1477 proven. 2734 refuted. 0 times theorem prover too weak. 2415 trivial. 0 not checked. [2018-10-24 12:19:57,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:57,166 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:57,166 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:57,166 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:57,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:57,166 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 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:57,175 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:19:57,175 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:19:57,283 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:19:57,284 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:57,289 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:57,461 INFO L134 CoverageAnalysis]: Checked inductivity of 6626 backedges. 1478 proven. 2628 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-10-24 12:19:57,461 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:58,621 INFO L134 CoverageAnalysis]: Checked inductivity of 6626 backedges. 1478 proven. 2628 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-10-24 12:19:58,642 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:58,642 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 45 [2018-10-24 12:19:58,643 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:58,643 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:19:58,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:19:58,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=792, Invalid=1188, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:19:58,644 INFO L87 Difference]: Start difference. First operand 379 states and 380 transitions. Second operand 45 states. [2018-10-24 12:19:59,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:59,150 INFO L93 Difference]: Finished difference Result 389 states and 390 transitions. [2018-10-24 12:19:59,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-24 12:19:59,150 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 376 [2018-10-24 12:19:59,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:59,152 INFO L225 Difference]: With dead ends: 389 [2018-10-24 12:19:59,153 INFO L226 Difference]: Without dead ends: 387 [2018-10-24 12:19:59,153 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 834 GetRequests, 714 SyntacticMatches, 75 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1669 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=805, Invalid=1357, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:19:59,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2018-10-24 12:19:59,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 387. [2018-10-24 12:19:59,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 387 states. [2018-10-24 12:19:59,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 388 transitions. [2018-10-24 12:19:59,165 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 388 transitions. Word has length 376 [2018-10-24 12:19:59,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:59,165 INFO L481 AbstractCegarLoop]: Abstraction has 387 states and 388 transitions. [2018-10-24 12:19:59,165 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:19:59,165 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 388 transitions. [2018-10-24 12:19:59,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 385 [2018-10-24 12:19:59,168 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:59,168 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 38, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:59,168 INFO L424 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:59,168 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:59,168 INFO L82 PathProgramCache]: Analyzing trace with hash 1357713805, now seen corresponding path program 73 times [2018-10-24 12:19:59,169 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:59,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:59,169 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:59,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:59,169 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:59,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:01,165 INFO L134 CoverageAnalysis]: Checked inductivity of 6919 backedges. 2849 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:20:01,165 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:01,165 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:20:01,165 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:20:01,165 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:20:01,165 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:01,165 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 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:20:01,173 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:20:01,173 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:20:01,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:01,282 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:20:03,570 INFO L134 CoverageAnalysis]: Checked inductivity of 6919 backedges. 2849 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:20:03,571 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:20:05,511 INFO L134 CoverageAnalysis]: Checked inductivity of 6919 backedges. 2849 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:20:05,532 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:20:05,533 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 117 [2018-10-24 12:20:05,533 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:20:05,533 INFO L460 AbstractCegarLoop]: Interpolant automaton has 117 states [2018-10-24 12:20:05,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2018-10-24 12:20:05,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3119, Invalid=10453, Unknown=0, NotChecked=0, Total=13572 [2018-10-24 12:20:05,534 INFO L87 Difference]: Start difference. First operand 387 states and 388 transitions. Second operand 117 states. [2018-10-24 12:20:08,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:20:08,394 INFO L93 Difference]: Finished difference Result 550 states and 589 transitions. [2018-10-24 12:20:08,395 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-10-24 12:20:08,395 INFO L78 Accepts]: Start accepts. Automaton has 117 states. Word has length 384 [2018-10-24 12:20:08,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:20:08,396 INFO L225 Difference]: With dead ends: 550 [2018-10-24 12:20:08,396 INFO L226 Difference]: Without dead ends: 389 [2018-10-24 12:20:08,398 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 885 GetRequests, 655 SyntacticMatches, 76 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9955 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=5498, Invalid=18682, Unknown=0, NotChecked=0, Total=24180 [2018-10-24 12:20:08,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2018-10-24 12:20:08,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 389. [2018-10-24 12:20:08,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 389 states. [2018-10-24 12:20:08,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 389 states to 389 states and 390 transitions. [2018-10-24 12:20:08,411 INFO L78 Accepts]: Start accepts. Automaton has 389 states and 390 transitions. Word has length 384 [2018-10-24 12:20:08,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:20:08,412 INFO L481 AbstractCegarLoop]: Abstraction has 389 states and 390 transitions. [2018-10-24 12:20:08,412 INFO L482 AbstractCegarLoop]: Interpolant automaton has 117 states. [2018-10-24 12:20:08,412 INFO L276 IsEmpty]: Start isEmpty. Operand 389 states and 390 transitions. [2018-10-24 12:20:08,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2018-10-24 12:20:08,413 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:20:08,413 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 38, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:20:08,414 INFO L424 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:20:08,414 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:20:08,414 INFO L82 PathProgramCache]: Analyzing trace with hash 307849415, now seen corresponding path program 74 times [2018-10-24 12:20:08,414 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:20:08,414 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:08,415 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:20:08,415 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:08,415 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:20:08,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:09,195 INFO L134 CoverageAnalysis]: Checked inductivity of 6995 backedges. 1555 proven. 2884 refuted. 0 times theorem prover too weak. 2556 trivial. 0 not checked. [2018-10-24 12:20:09,195 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:09,196 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:20:09,196 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:20:09,196 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:20:09,196 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:09,196 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 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:20:09,204 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:20:09,204 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:20:09,378 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-10-24 12:20:09,378 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:20:09,386 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:20:09,545 INFO L134 CoverageAnalysis]: Checked inductivity of 6995 backedges. 1556 proven. 2775 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:20:09,545 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:20:10,856 INFO L134 CoverageAnalysis]: Checked inductivity of 6995 backedges. 1556 proven. 2775 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:20:10,879 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:20:10,879 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43, 43] total 46 [2018-10-24 12:20:10,879 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:20:10,880 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-24 12:20:10,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-24 12:20:10,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=832, Invalid=1238, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:20:10,880 INFO L87 Difference]: Start difference. First operand 389 states and 390 transitions. Second operand 46 states. [2018-10-24 12:20:11,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:20:11,439 INFO L93 Difference]: Finished difference Result 399 states and 400 transitions. [2018-10-24 12:20:11,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-24 12:20:11,439 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 386 [2018-10-24 12:20:11,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:20:11,442 INFO L225 Difference]: With dead ends: 399 [2018-10-24 12:20:11,442 INFO L226 Difference]: Without dead ends: 397 [2018-10-24 12:20:11,442 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 856 GetRequests, 733 SyntacticMatches, 77 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1752 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=845, Invalid=1411, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:20:11,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2018-10-24 12:20:11,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 397. [2018-10-24 12:20:11,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 397 states. [2018-10-24 12:20:11,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 398 transitions. [2018-10-24 12:20:11,457 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 398 transitions. Word has length 386 [2018-10-24 12:20:11,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:20:11,458 INFO L481 AbstractCegarLoop]: Abstraction has 397 states and 398 transitions. [2018-10-24 12:20:11,458 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-24 12:20:11,458 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 398 transitions. [2018-10-24 12:20:11,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 395 [2018-10-24 12:20:11,460 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:20:11,460 INFO L375 BasicCegarLoop]: trace histogram [39, 39, 39, 39, 39, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:20:11,460 INFO L424 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:20:11,461 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:20:11,461 INFO L82 PathProgramCache]: Analyzing trace with hash 1852597995, now seen corresponding path program 75 times [2018-10-24 12:20:11,461 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:20:11,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:11,461 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:20:11,462 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:11,462 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:20:11,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:13,639 INFO L134 CoverageAnalysis]: Checked inductivity of 7296 backedges. 3002 proven. 1482 refuted. 0 times theorem prover too weak. 2812 trivial. 0 not checked. [2018-10-24 12:20:13,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:13,640 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:20:13,640 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:20:13,640 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:20:13,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:13,640 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 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:20:13,647 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:20:13,648 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:20:13,781 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:20:13,782 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:20:13,788 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:20:16,219 INFO L134 CoverageAnalysis]: Checked inductivity of 7296 backedges. 3002 proven. 1482 refuted. 0 times theorem prover too weak. 2812 trivial. 0 not checked. [2018-10-24 12:20:16,219 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:20:18,149 INFO L134 CoverageAnalysis]: Checked inductivity of 7296 backedges. 3002 proven. 1482 refuted. 0 times theorem prover too weak. 2812 trivial. 0 not checked. [2018-10-24 12:20:18,174 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:20:18,174 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 120 [2018-10-24 12:20:18,174 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:20:18,175 INFO L460 AbstractCegarLoop]: Interpolant automaton has 120 states [2018-10-24 12:20:18,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2018-10-24 12:20:18,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3279, Invalid=11001, Unknown=0, NotChecked=0, Total=14280 [2018-10-24 12:20:18,176 INFO L87 Difference]: Start difference. First operand 397 states and 398 transitions. Second operand 120 states. Received shutdown request... [2018-10-24 12:20:18,271 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:20:18,271 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-24 12:20:18,276 WARN L205 ceAbstractionStarter]: Timeout [2018-10-24 12:20:18,277 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:20:18 BoogieIcfgContainer [2018-10-24 12:20:18,277 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:20:18,278 INFO L168 Benchmark]: Toolchain (without parser) took 232345.31 ms. Allocated memory was 1.5 GB in the beginning and 2.7 GB in the end (delta: 1.2 GB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -781.6 MB). Peak memory consumption was 425.3 MB. Max. memory is 7.1 GB. [2018-10-24 12:20:18,279 INFO L168 Benchmark]: CDTParser took 0.20 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. [2018-10-24 12:20:18,279 INFO L168 Benchmark]: CACSL2BoogieTranslator took 263.10 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. [2018-10-24 12:20:18,280 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.63 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. [2018-10-24 12:20:18,280 INFO L168 Benchmark]: Boogie Preprocessor took 33.55 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. [2018-10-24 12:20:18,280 INFO L168 Benchmark]: RCFGBuilder took 468.55 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 756.5 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -805.7 MB). Peak memory consumption was 26.9 MB. Max. memory is 7.1 GB. [2018-10-24 12:20:18,281 INFO L168 Benchmark]: TraceAbstraction took 231550.68 ms. Allocated memory was 2.3 GB in the beginning and 2.7 GB in the end (delta: 450.4 MB). Free memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: 13.5 MB). Peak memory consumption was 463.9 MB. Max. memory is 7.1 GB. [2018-10-24 12:20:18,283 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 263.10 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 24.63 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 33.55 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 468.55 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 756.5 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -805.7 MB). Peak memory consumption was 26.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 231550.68 ms. Allocated memory was 2.3 GB in the beginning and 2.7 GB in the end (delta: 450.4 MB). Free memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: 13.5 MB). Peak memory consumption was 463.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was constructing difference of abstraction (397states) and FLOYD_HOARE automaton (currently 41 states, 120 states before enhancement),while PredicateComparison was comparing new predicate (quantifier-free) to 120 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 22 locations, 1 error locations. TIMEOUT Result, 231.4s OverallTime, 78 OverallIterations, 39 TraceHistogramMax, 65.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 3911 SDtfs, 3030 SDslu, 44389 SDs, 0 SdLazy, 53751 SolverSat, 3658 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 33.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 35332 GetRequests, 28058 SyntacticMatches, 3075 SemanticMatches, 4198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164187 ImplicationChecksByTransitivity, 160.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=397occurred in iteration=77, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.5s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.7s AutomataMinimizationTime, 77 MinimizatonAttempts, 5 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.9s SsaConstructionTime, 5.5s SatisfiabilityAnalysisTime, 152.9s InterpolantComputationTime, 31171 NumberOfCodeBlocks, 31171 NumberOfCodeBlocksAsserted, 672 NumberOfCheckSat, 46507 ConstructedInterpolants, 0 QuantifiedInterpolants, 33375145 SizeOfPredicates, 226 NumberOfNonLiveVariables, 33021 ConjunctsInSsa, 3336 ConjunctsInUnsatCore, 228 InterpolantComputations, 3 PerfectInterpolantSequences, 393142/562016 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown