java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT-LIM.epf -i ../../../trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 22:14:57,141 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 22:14:57,143 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 22:14:57,155 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 22:14:57,155 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 22:14:57,156 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 22:14:57,157 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 22:14:57,159 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 22:14:57,161 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 22:14:57,161 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 22:14:57,162 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 22:14:57,163 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 22:14:57,163 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 22:14:57,164 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 22:14:57,166 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 22:14:57,167 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 22:14:57,167 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 22:14:57,169 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 22:14:57,171 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 22:14:57,173 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 22:14:57,174 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 22:14:57,176 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 22:14:57,178 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 22:14:57,179 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 22:14:57,179 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 22:14:57,180 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 22:14:57,181 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 22:14:57,182 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 22:14:57,183 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 22:14:57,184 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 22:14:57,184 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 22:14:57,185 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-11-07 22:14:57,190 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT-LIM.epf [2018-11-07 22:14:57,224 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 22:14:57,224 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 22:14:57,225 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 22:14:57,225 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 22:14:57,225 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 22:14:57,229 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 22:14:57,229 INFO L133 SettingsManager]: * Maximum recursion depth of evaluation operations=6 [2018-11-07 22:14:57,229 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 22:14:57,229 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 22:14:57,229 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 22:14:57,230 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 22:14:57,230 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 22:14:57,230 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 22:14:57,231 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 22:14:57,231 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 22:14:57,231 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 22:14:57,231 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 22:14:57,232 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 22:14:57,232 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 22:14:57,232 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 22:14:57,232 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 22:14:57,234 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 22:14:57,234 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 22:14:57,234 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 22:14:57,234 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 22:14:57,235 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 22:14:57,235 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 22:14:57,235 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 22:14:57,235 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 22:14:57,236 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 22:14:57,237 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 22:14:57,237 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 22:14:57,237 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 22:14:57,237 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 22:14:57,237 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 22:14:57,294 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 22:14:57,308 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 22:14:57,313 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 22:14:57,315 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 22:14:57,316 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 22:14:57,317 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i [2018-11-07 22:14:57,387 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fe0b2276d/b3e35320b8c34087a1efe500f6f4da73/FLAG71154cde1 [2018-11-07 22:14:57,796 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 22:14:57,797 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i [2018-11-07 22:14:57,804 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fe0b2276d/b3e35320b8c34087a1efe500f6f4da73/FLAG71154cde1 [2018-11-07 22:14:57,820 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fe0b2276d/b3e35320b8c34087a1efe500f6f4da73 [2018-11-07 22:14:57,831 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 22:14:57,833 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 22:14:57,834 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 22:14:57,834 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 22:14:57,838 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 22:14:57,839 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:14:57" (1/1) ... [2018-11-07 22:14:57,842 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@13b6a1c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:57, skipping insertion in model container [2018-11-07 22:14:57,842 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:14:57" (1/1) ... [2018-11-07 22:14:57,852 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 22:14:57,877 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 22:14:58,140 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:14:58,147 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 22:14:58,166 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:14:58,184 INFO L193 MainTranslator]: Completed translation [2018-11-07 22:14:58,185 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:58 WrapperNode [2018-11-07 22:14:58,185 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 22:14:58,186 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 22:14:58,186 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 22:14:58,186 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 22:14:58,196 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:58" (1/1) ... [2018-11-07 22:14:58,202 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:58" (1/1) ... [2018-11-07 22:14:58,210 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 22:14:58,210 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 22:14:58,210 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 22:14:58,211 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 22:14:58,220 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:58" (1/1) ... [2018-11-07 22:14:58,220 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:58" (1/1) ... [2018-11-07 22:14:58,221 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:58" (1/1) ... [2018-11-07 22:14:58,221 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:58" (1/1) ... [2018-11-07 22:14:58,224 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:58" (1/1) ... [2018-11-07 22:14:58,229 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:58" (1/1) ... [2018-11-07 22:14:58,230 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:58" (1/1) ... [2018-11-07 22:14:58,232 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 22:14:58,232 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 22:14:58,232 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 22:14:58,232 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 22:14:58,234 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:58" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:14:58,385 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 22:14:58,386 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 22:14:58,386 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 22:14:58,386 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 22:14:58,386 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 22:14:58,386 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 22:14:58,387 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 22:14:58,387 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 22:14:58,700 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 22:14:58,700 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:14:58 BoogieIcfgContainer [2018-11-07 22:14:58,701 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 22:14:58,702 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 22:14:58,702 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 22:14:58,705 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 22:14:58,706 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 10:14:57" (1/3) ... [2018-11-07 22:14:58,707 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a565ab4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:14:58, skipping insertion in model container [2018-11-07 22:14:58,707 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:14:58" (2/3) ... [2018-11-07 22:14:58,707 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a565ab4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:14:58, skipping insertion in model container [2018-11-07 22:14:58,707 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:14:58" (3/3) ... [2018-11-07 22:14:58,709 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_k_true-unreach-call_true-termination.i [2018-11-07 22:14:58,720 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 22:14:58,729 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 22:14:58,765 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 22:14:58,816 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 22:14:58,816 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 22:14:58,816 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 22:14:58,816 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 22:14:58,817 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 22:14:58,817 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 22:14:58,817 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 22:14:58,818 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 22:14:58,865 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-11-07 22:14:58,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-07 22:14:58,877 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:58,886 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:58,889 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:58,906 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:58,907 INFO L82 PathProgramCache]: Analyzing trace with hash 1152414567, now seen corresponding path program 1 times [2018-11-07 22:14:58,910 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:58,966 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:58,966 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:58,966 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:58,966 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:58,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:59,028 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:59,030 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:14:59,031 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 22:14:59,031 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:14:59,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 22:14:59,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 22:14:59,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 22:14:59,050 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-11-07 22:14:59,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:59,075 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2018-11-07 22:14:59,075 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 22:14:59,076 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2018-11-07 22:14:59,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:59,086 INFO L225 Difference]: With dead ends: 33 [2018-11-07 22:14:59,086 INFO L226 Difference]: Without dead ends: 14 [2018-11-07 22:14:59,092 INFO L604 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 [2018-11-07 22:14:59,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-11-07 22:14:59,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-11-07 22:14:59,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-11-07 22:14:59,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-11-07 22:14:59,135 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-11-07 22:14:59,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:59,136 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-11-07 22:14:59,136 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 22:14:59,136 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-11-07 22:14:59,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-11-07 22:14:59,137 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:59,137 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:59,138 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:59,138 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:59,138 INFO L82 PathProgramCache]: Analyzing trace with hash 1083883255, now seen corresponding path program 1 times [2018-11-07 22:14:59,138 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:59,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:59,142 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:59,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:59,144 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:59,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:59,382 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:59,383 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:14:59,383 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-11-07 22:14:59,383 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:14:59,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 22:14:59,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 22:14:59,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-11-07 22:14:59,386 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2018-11-07 22:14:59,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:59,547 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-11-07 22:14:59,548 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 22:14:59,548 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2018-11-07 22:14:59,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:59,549 INFO L225 Difference]: With dead ends: 21 [2018-11-07 22:14:59,549 INFO L226 Difference]: Without dead ends: 16 [2018-11-07 22:14:59,550 INFO L604 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 [2018-11-07 22:14:59,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-11-07 22:14:59,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-11-07 22:14:59,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-11-07 22:14:59,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-11-07 22:14:59,555 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 12 [2018-11-07 22:14:59,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:59,555 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-11-07 22:14:59,556 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 22:14:59,556 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-11-07 22:14:59,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-11-07 22:14:59,556 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:59,557 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:59,557 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:59,557 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:59,558 INFO L82 PathProgramCache]: Analyzing trace with hash 1128913667, now seen corresponding path program 1 times [2018-11-07 22:14:59,558 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:59,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:59,559 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:59,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:59,559 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:59,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:59,649 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:14:59,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:59,649 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:59,650 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-11-07 22:14:59,652 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [15], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-11-07 22:14:59,687 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 22:14:59,687 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 22:14:59,989 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 22:14:59,991 INFO L272 AbstractInterpreter]: Visited 14 different actions 62 times. Merged at 4 different actions 24 times. Widened at 1 different actions 2 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-11-07 22:15:00,005 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:00,006 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 22:15:00,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:00,006 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:15:00,018 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:00,018 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:15:00,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:00,055 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:00,323 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:00,324 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:00,434 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:00,456 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:00,456 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-11-07 22:15:00,456 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:00,457 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-07 22:15:00,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-07 22:15:00,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-11-07 22:15:00,458 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 7 states. [2018-11-07 22:15:00,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:00,601 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-11-07 22:15:00,601 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-07 22:15:00,601 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-11-07 22:15:00,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:00,602 INFO L225 Difference]: With dead ends: 30 [2018-11-07 22:15:00,602 INFO L226 Difference]: Without dead ends: 25 [2018-11-07 22:15:00,603 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-11-07 22:15:00,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-11-07 22:15:00,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-11-07 22:15:00,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-11-07 22:15:00,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-11-07 22:15:00,609 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 15 [2018-11-07 22:15:00,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:00,610 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-11-07 22:15:00,610 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-07 22:15:00,610 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-11-07 22:15:00,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-11-07 22:15:00,611 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:00,611 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:00,611 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:00,611 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:00,611 INFO L82 PathProgramCache]: Analyzing trace with hash 1437681655, now seen corresponding path program 2 times [2018-11-07 22:15:00,612 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:00,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:00,613 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:00,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:00,613 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:00,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:00,884 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:00,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:00,885 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:00,885 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:00,886 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:00,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:00,886 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:15:00,905 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:15:00,906 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:15:00,943 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-11-07 22:15:00,944 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:00,946 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:01,131 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:01,131 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:01,416 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:01,451 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:01,451 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-11-07 22:15:01,451 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:01,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 22:15:01,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 22:15:01,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2018-11-07 22:15:01,453 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2018-11-07 22:15:01,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:01,946 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2018-11-07 22:15:01,947 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 22:15:01,947 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2018-11-07 22:15:01,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:01,948 INFO L225 Difference]: With dead ends: 39 [2018-11-07 22:15:01,948 INFO L226 Difference]: Without dead ends: 34 [2018-11-07 22:15:01,949 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=127, Invalid=253, Unknown=0, NotChecked=0, Total=380 [2018-11-07 22:15:01,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-11-07 22:15:01,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-11-07 22:15:01,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-11-07 22:15:01,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-11-07 22:15:01,956 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 24 [2018-11-07 22:15:01,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:01,956 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-11-07 22:15:01,956 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 22:15:01,957 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-11-07 22:15:01,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-11-07 22:15:01,958 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:01,958 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:01,958 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:01,958 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:01,958 INFO L82 PathProgramCache]: Analyzing trace with hash -656200317, now seen corresponding path program 3 times [2018-11-07 22:15:01,959 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:01,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:01,960 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:01,960 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:01,960 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:01,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:02,142 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:02,143 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:02,143 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:02,143 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:02,144 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:02,144 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:02,144 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:15:02,159 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:15:02,160 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:15:02,180 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:15:02,180 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:02,183 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:02,306 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:02,306 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:02,602 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:02,622 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:02,623 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-11-07 22:15:02,623 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:02,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 22:15:02,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 22:15:02,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=261, Unknown=0, NotChecked=0, Total=380 [2018-11-07 22:15:02,625 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 13 states. [2018-11-07 22:15:02,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:02,964 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2018-11-07 22:15:02,971 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 22:15:02,971 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2018-11-07 22:15:02,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:02,972 INFO L225 Difference]: With dead ends: 48 [2018-11-07 22:15:02,972 INFO L226 Difference]: Without dead ends: 43 [2018-11-07 22:15:02,974 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=277, Invalid=535, Unknown=0, NotChecked=0, Total=812 [2018-11-07 22:15:02,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-11-07 22:15:02,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-11-07 22:15:02,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-11-07 22:15:02,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-11-07 22:15:02,990 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 33 [2018-11-07 22:15:02,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:02,994 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-11-07 22:15:02,994 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 22:15:02,994 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-11-07 22:15:02,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-11-07 22:15:02,995 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:02,996 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:02,997 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:02,998 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:02,998 INFO L82 PathProgramCache]: Analyzing trace with hash -1490238089, now seen corresponding path program 4 times [2018-11-07 22:15:02,998 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:02,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:02,999 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:02,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:02,999 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:03,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:03,603 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:03,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:03,604 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:03,604 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:03,604 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:03,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:03,605 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:15:03,621 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:03,621 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:15:03,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:03,641 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:03,749 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:03,749 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:04,303 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:04,323 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:04,323 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-11-07 22:15:04,323 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:04,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 22:15:04,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 22:15:04,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=441, Unknown=0, NotChecked=0, Total=650 [2018-11-07 22:15:04,325 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 16 states. [2018-11-07 22:15:04,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:04,874 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2018-11-07 22:15:04,876 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 22:15:04,876 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 42 [2018-11-07 22:15:04,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:04,878 INFO L225 Difference]: With dead ends: 57 [2018-11-07 22:15:04,878 INFO L226 Difference]: Without dead ends: 52 [2018-11-07 22:15:04,879 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=490, Invalid=916, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 22:15:04,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-11-07 22:15:04,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-11-07 22:15:04,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-11-07 22:15:04,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-11-07 22:15:04,888 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 42 [2018-11-07 22:15:04,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:04,888 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-11-07 22:15:04,889 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 22:15:04,889 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-11-07 22:15:04,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-11-07 22:15:04,890 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:04,890 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:04,891 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:04,891 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:04,891 INFO L82 PathProgramCache]: Analyzing trace with hash 45932547, now seen corresponding path program 5 times [2018-11-07 22:15:04,891 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:04,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:04,892 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:04,893 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:04,893 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:04,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:05,481 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:05,481 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:05,481 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:05,482 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:05,482 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:05,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:05,482 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:15:05,491 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:15:05,491 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:15:05,527 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-11-07 22:15:05,527 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:05,530 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:05,709 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:05,709 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:06,183 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:06,204 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:06,204 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-11-07 22:15:06,204 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:06,206 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 22:15:06,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 22:15:06,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=666, Unknown=0, NotChecked=0, Total=992 [2018-11-07 22:15:06,207 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 19 states. [2018-11-07 22:15:07,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:07,135 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2018-11-07 22:15:07,139 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 22:15:07,139 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 51 [2018-11-07 22:15:07,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:07,140 INFO L225 Difference]: With dead ends: 66 [2018-11-07 22:15:07,141 INFO L226 Difference]: Without dead ends: 61 [2018-11-07 22:15:07,142 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=766, Invalid=1396, Unknown=0, NotChecked=0, Total=2162 [2018-11-07 22:15:07,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-11-07 22:15:07,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-11-07 22:15:07,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-11-07 22:15:07,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-11-07 22:15:07,150 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 51 [2018-11-07 22:15:07,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:07,151 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-11-07 22:15:07,151 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 22:15:07,151 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-11-07 22:15:07,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-11-07 22:15:07,153 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:07,153 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:07,153 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:07,153 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:07,153 INFO L82 PathProgramCache]: Analyzing trace with hash -1227627785, now seen corresponding path program 6 times [2018-11-07 22:15:07,154 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:07,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:07,155 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:07,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:07,155 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:07,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:07,867 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:07,867 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:07,867 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:07,868 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:07,868 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:07,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:07,868 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:15:07,877 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:15:07,878 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:15:07,899 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:15:07,899 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:07,904 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:08,010 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:08,011 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:08,766 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:08,787 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:08,787 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-11-07 22:15:08,788 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:08,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-07 22:15:08,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-07 22:15:08,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=936, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 22:15:08,790 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 22 states. [2018-11-07 22:15:09,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:09,761 INFO L93 Difference]: Finished difference Result 75 states and 77 transitions. [2018-11-07 22:15:09,762 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-07 22:15:09,762 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 60 [2018-11-07 22:15:09,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:09,763 INFO L225 Difference]: With dead ends: 75 [2018-11-07 22:15:09,763 INFO L226 Difference]: Without dead ends: 70 [2018-11-07 22:15:09,765 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 270 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1105, Invalid=1975, Unknown=0, NotChecked=0, Total=3080 [2018-11-07 22:15:09,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-11-07 22:15:09,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-11-07 22:15:09,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-11-07 22:15:09,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2018-11-07 22:15:09,774 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 60 [2018-11-07 22:15:09,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:09,774 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2018-11-07 22:15:09,774 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-07 22:15:09,775 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2018-11-07 22:15:09,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-11-07 22:15:09,776 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:09,776 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:09,776 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:09,777 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:09,777 INFO L82 PathProgramCache]: Analyzing trace with hash 360641155, now seen corresponding path program 7 times [2018-11-07 22:15:09,777 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:09,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:09,778 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:09,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:09,778 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:09,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:10,177 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:10,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:10,178 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:10,178 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:10,178 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:10,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:10,178 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:15:10,189 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:10,190 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:15:10,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:10,221 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:10,317 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:10,317 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:11,445 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:11,465 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:11,465 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-11-07 22:15:11,466 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:11,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-07 22:15:11,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-07 22:15:11,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=641, Invalid=1251, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 22:15:11,468 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand 25 states. [2018-11-07 22:15:12,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:12,590 INFO L93 Difference]: Finished difference Result 84 states and 86 transitions. [2018-11-07 22:15:12,592 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-07 22:15:12,592 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 69 [2018-11-07 22:15:12,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:12,593 INFO L225 Difference]: With dead ends: 84 [2018-11-07 22:15:12,593 INFO L226 Difference]: Without dead ends: 79 [2018-11-07 22:15:12,595 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1507, Invalid=2653, Unknown=0, NotChecked=0, Total=4160 [2018-11-07 22:15:12,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-11-07 22:15:12,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-11-07 22:15:12,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-11-07 22:15:12,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2018-11-07 22:15:12,604 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 69 [2018-11-07 22:15:12,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:12,604 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2018-11-07 22:15:12,604 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-07 22:15:12,605 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2018-11-07 22:15:12,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-11-07 22:15:12,606 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:12,606 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:12,606 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:12,606 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:12,607 INFO L82 PathProgramCache]: Analyzing trace with hash -318857097, now seen corresponding path program 8 times [2018-11-07 22:15:12,607 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:12,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:12,608 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:12,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:12,608 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:12,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:13,078 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:13,079 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:13,079 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:13,079 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:13,079 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:13,079 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:13,079 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:15:13,090 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:15:13,090 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:15:13,121 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-11-07 22:15:13,121 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:13,125 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:13,218 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:13,219 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:14,140 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:14,160 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:14,160 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2018-11-07 22:15:14,160 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:14,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-07 22:15:14,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-07 22:15:14,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=839, Invalid=1611, Unknown=0, NotChecked=0, Total=2450 [2018-11-07 22:15:14,162 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 28 states. [2018-11-07 22:15:15,119 WARN L179 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 11 [2018-11-07 22:15:16,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:16,003 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2018-11-07 22:15:16,003 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-07 22:15:16,003 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 78 [2018-11-07 22:15:16,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:16,005 INFO L225 Difference]: With dead ends: 93 [2018-11-07 22:15:16,005 INFO L226 Difference]: Without dead ends: 88 [2018-11-07 22:15:16,007 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 131 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1972, Invalid=3430, Unknown=0, NotChecked=0, Total=5402 [2018-11-07 22:15:16,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-11-07 22:15:16,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-11-07 22:15:16,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-11-07 22:15:16,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 88 transitions. [2018-11-07 22:15:16,016 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 88 transitions. Word has length 78 [2018-11-07 22:15:16,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:16,016 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 88 transitions. [2018-11-07 22:15:16,016 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-07 22:15:16,016 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 88 transitions. [2018-11-07 22:15:16,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-11-07 22:15:16,018 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:16,018 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:16,018 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:16,018 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:16,018 INFO L82 PathProgramCache]: Analyzing trace with hash -1949211389, now seen corresponding path program 9 times [2018-11-07 22:15:16,019 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:16,019 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:16,020 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:16,020 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:16,020 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:16,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:17,345 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:17,345 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:17,345 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:17,346 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:17,346 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:17,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:17,346 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:15:17,362 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:15:17,362 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:15:17,388 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:15:17,388 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:17,395 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:17,577 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:17,577 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:18,744 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:18,763 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:18,764 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-11-07 22:15:18,764 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:18,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-11-07 22:15:18,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-11-07 22:15:18,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1064, Invalid=2016, Unknown=0, NotChecked=0, Total=3080 [2018-11-07 22:15:18,766 INFO L87 Difference]: Start difference. First operand 88 states and 88 transitions. Second operand 31 states. [2018-11-07 22:15:19,684 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 11 [2018-11-07 22:15:20,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:20,768 INFO L93 Difference]: Finished difference Result 102 states and 104 transitions. [2018-11-07 22:15:20,774 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-11-07 22:15:20,774 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 87 [2018-11-07 22:15:20,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:20,775 INFO L225 Difference]: With dead ends: 102 [2018-11-07 22:15:20,775 INFO L226 Difference]: Without dead ends: 97 [2018-11-07 22:15:20,778 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 146 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=2500, Invalid=4306, Unknown=0, NotChecked=0, Total=6806 [2018-11-07 22:15:20,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-11-07 22:15:20,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-11-07 22:15:20,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-11-07 22:15:20,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2018-11-07 22:15:20,788 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 87 [2018-11-07 22:15:20,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:20,788 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2018-11-07 22:15:20,788 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-11-07 22:15:20,788 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2018-11-07 22:15:20,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-11-07 22:15:20,790 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:20,790 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:20,790 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:20,791 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:20,791 INFO L82 PathProgramCache]: Analyzing trace with hash 1275395575, now seen corresponding path program 10 times [2018-11-07 22:15:20,791 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:20,792 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:20,792 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:20,792 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:20,792 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:20,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:21,385 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:21,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:21,386 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:21,386 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:21,386 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:21,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:21,386 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:15:21,395 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:21,395 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:15:21,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:21,454 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:21,566 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:21,567 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:22,864 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:22,885 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:22,886 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2018-11-07 22:15:22,886 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:22,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-11-07 22:15:22,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-11-07 22:15:22,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1316, Invalid=2466, Unknown=0, NotChecked=0, Total=3782 [2018-11-07 22:15:22,888 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 34 states. [2018-11-07 22:15:25,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:25,181 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2018-11-07 22:15:25,182 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-11-07 22:15:25,182 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 96 [2018-11-07 22:15:25,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:25,183 INFO L225 Difference]: With dead ends: 111 [2018-11-07 22:15:25,183 INFO L226 Difference]: Without dead ends: 106 [2018-11-07 22:15:25,187 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 636 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=3091, Invalid=5281, Unknown=0, NotChecked=0, Total=8372 [2018-11-07 22:15:25,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-11-07 22:15:25,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2018-11-07 22:15:25,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-11-07 22:15:25,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 106 transitions. [2018-11-07 22:15:25,195 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 106 transitions. Word has length 96 [2018-11-07 22:15:25,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:25,196 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 106 transitions. [2018-11-07 22:15:25,196 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-11-07 22:15:25,196 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 106 transitions. [2018-11-07 22:15:25,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-11-07 22:15:25,198 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:25,198 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:25,198 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:25,198 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:25,199 INFO L82 PathProgramCache]: Analyzing trace with hash -2040776829, now seen corresponding path program 11 times [2018-11-07 22:15:25,199 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:25,199 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:25,200 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:25,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:25,200 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:25,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:25,935 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:25,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:25,935 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:25,935 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:25,935 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:25,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:25,936 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:15:25,944 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:15:25,944 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:15:25,998 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-11-07 22:15:25,998 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:26,002 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:26,151 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:26,151 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:27,589 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:27,618 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:27,619 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 68 [2018-11-07 22:15:27,619 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:27,619 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-11-07 22:15:27,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-11-07 22:15:27,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1595, Invalid=2961, Unknown=0, NotChecked=0, Total=4556 [2018-11-07 22:15:27,622 INFO L87 Difference]: Start difference. First operand 106 states and 106 transitions. Second operand 37 states. [2018-11-07 22:15:27,874 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 8 [2018-11-07 22:15:30,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:30,292 INFO L93 Difference]: Finished difference Result 120 states and 122 transitions. [2018-11-07 22:15:30,292 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-11-07 22:15:30,292 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 105 [2018-11-07 22:15:30,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:30,293 INFO L225 Difference]: With dead ends: 120 [2018-11-07 22:15:30,294 INFO L226 Difference]: Without dead ends: 115 [2018-11-07 22:15:30,297 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 176 SyntacticMatches, 2 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 750 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=3745, Invalid=6355, Unknown=0, NotChecked=0, Total=10100 [2018-11-07 22:15:30,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-11-07 22:15:30,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2018-11-07 22:15:30,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-11-07 22:15:30,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2018-11-07 22:15:30,305 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 105 [2018-11-07 22:15:30,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:30,305 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2018-11-07 22:15:30,305 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-11-07 22:15:30,305 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2018-11-07 22:15:30,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-11-07 22:15:30,307 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:30,307 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:30,308 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:30,308 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:30,308 INFO L82 PathProgramCache]: Analyzing trace with hash -264307849, now seen corresponding path program 12 times [2018-11-07 22:15:30,308 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:30,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:30,309 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:30,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:30,309 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:30,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:31,164 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:31,165 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:31,165 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:31,165 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:31,165 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:31,165 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:31,165 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:15:31,174 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:15:31,174 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:15:31,227 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:15:31,228 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:31,249 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:31,375 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:31,375 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:33,474 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:33,494 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:33,494 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 74 [2018-11-07 22:15:33,495 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:33,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-11-07 22:15:33,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-11-07 22:15:33,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1901, Invalid=3501, Unknown=0, NotChecked=0, Total=5402 [2018-11-07 22:15:33,498 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 40 states. [2018-11-07 22:15:36,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:36,417 INFO L93 Difference]: Finished difference Result 129 states and 131 transitions. [2018-11-07 22:15:36,417 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-11-07 22:15:36,417 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 114 [2018-11-07 22:15:36,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:36,419 INFO L225 Difference]: With dead ends: 129 [2018-11-07 22:15:36,419 INFO L226 Difference]: Without dead ends: 124 [2018-11-07 22:15:36,421 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 191 SyntacticMatches, 2 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 873 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=4462, Invalid=7528, Unknown=0, NotChecked=0, Total=11990 [2018-11-07 22:15:36,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-11-07 22:15:36,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2018-11-07 22:15:36,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-11-07 22:15:36,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 124 transitions. [2018-11-07 22:15:36,428 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 124 transitions. Word has length 114 [2018-11-07 22:15:36,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:36,429 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 124 transitions. [2018-11-07 22:15:36,429 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-11-07 22:15:36,429 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 124 transitions. [2018-11-07 22:15:36,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-11-07 22:15:36,431 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:36,431 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:36,431 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:36,431 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:36,432 INFO L82 PathProgramCache]: Analyzing trace with hash 1271360003, now seen corresponding path program 13 times [2018-11-07 22:15:36,432 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:36,432 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:36,433 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:36,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:36,433 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:36,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:37,399 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:37,399 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:37,399 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:37,399 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:37,400 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:37,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:37,400 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:15:37,409 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:37,410 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:15:37,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:37,514 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:37,637 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:37,637 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:39,922 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:39,942 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:39,942 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 80 [2018-11-07 22:15:39,942 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:39,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-11-07 22:15:39,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-11-07 22:15:39,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2234, Invalid=4086, Unknown=0, NotChecked=0, Total=6320 [2018-11-07 22:15:39,944 INFO L87 Difference]: Start difference. First operand 124 states and 124 transitions. Second operand 43 states. [2018-11-07 22:15:43,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:43,655 INFO L93 Difference]: Finished difference Result 138 states and 140 transitions. [2018-11-07 22:15:43,656 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-11-07 22:15:43,656 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 123 [2018-11-07 22:15:43,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:43,658 INFO L225 Difference]: With dead ends: 138 [2018-11-07 22:15:43,658 INFO L226 Difference]: Without dead ends: 133 [2018-11-07 22:15:43,660 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 206 SyntacticMatches, 2 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1005 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=5242, Invalid=8800, Unknown=0, NotChecked=0, Total=14042 [2018-11-07 22:15:43,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-11-07 22:15:43,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2018-11-07 22:15:43,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-11-07 22:15:43,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 133 transitions. [2018-11-07 22:15:43,666 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 133 transitions. Word has length 123 [2018-11-07 22:15:43,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:43,667 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 133 transitions. [2018-11-07 22:15:43,667 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-11-07 22:15:43,667 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 133 transitions. [2018-11-07 22:15:43,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-11-07 22:15:43,668 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:43,669 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:43,669 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:43,669 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:43,669 INFO L82 PathProgramCache]: Analyzing trace with hash -1878746889, now seen corresponding path program 14 times [2018-11-07 22:15:43,669 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:43,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:43,670 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:43,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:43,671 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:43,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:45,595 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:45,596 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:45,596 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:45,596 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:45,596 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:45,596 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:45,596 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:15:45,605 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:15:45,605 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:15:45,648 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-11-07 22:15:45,649 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:45,654 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:45,800 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:45,801 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:48,233 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:48,252 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:48,253 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 86 [2018-11-07 22:15:48,253 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:48,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-11-07 22:15:48,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-11-07 22:15:48,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2594, Invalid=4716, Unknown=0, NotChecked=0, Total=7310 [2018-11-07 22:15:48,254 INFO L87 Difference]: Start difference. First operand 133 states and 133 transitions. Second operand 46 states. [2018-11-07 22:15:52,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:52,390 INFO L93 Difference]: Finished difference Result 147 states and 149 transitions. [2018-11-07 22:15:52,390 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-11-07 22:15:52,390 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 132 [2018-11-07 22:15:52,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:52,392 INFO L225 Difference]: With dead ends: 147 [2018-11-07 22:15:52,392 INFO L226 Difference]: Without dead ends: 142 [2018-11-07 22:15:52,395 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 221 SyntacticMatches, 2 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1146 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=6085, Invalid=10171, Unknown=0, NotChecked=0, Total=16256 [2018-11-07 22:15:52,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-11-07 22:15:52,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2018-11-07 22:15:52,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-11-07 22:15:52,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 142 transitions. [2018-11-07 22:15:52,402 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 142 transitions. Word has length 132 [2018-11-07 22:15:52,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:52,402 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 142 transitions. [2018-11-07 22:15:52,402 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-11-07 22:15:52,402 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 142 transitions. [2018-11-07 22:15:52,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2018-11-07 22:15:52,404 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:52,404 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:52,404 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:52,404 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:52,404 INFO L82 PathProgramCache]: Analyzing trace with hash -927269757, now seen corresponding path program 15 times [2018-11-07 22:15:52,405 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:52,405 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:52,405 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:52,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:52,406 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:52,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:53,700 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:53,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:53,701 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:53,701 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:53,701 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:53,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:53,701 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:15:53,710 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:15:53,710 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:15:53,750 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:15:53,750 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:53,759 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:53,892 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:53,892 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:56,905 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:15:56,924 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:56,925 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 92 [2018-11-07 22:15:56,925 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:56,925 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-11-07 22:15:56,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-11-07 22:15:56,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2981, Invalid=5391, Unknown=0, NotChecked=0, Total=8372 [2018-11-07 22:15:56,927 INFO L87 Difference]: Start difference. First operand 142 states and 142 transitions. Second operand 49 states. [2018-11-07 22:16:01,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:16:01,746 INFO L93 Difference]: Finished difference Result 156 states and 158 transitions. [2018-11-07 22:16:01,746 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-11-07 22:16:01,746 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 141 [2018-11-07 22:16:01,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:16:01,747 INFO L225 Difference]: With dead ends: 156 [2018-11-07 22:16:01,748 INFO L226 Difference]: Without dead ends: 151 [2018-11-07 22:16:01,749 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 236 SyntacticMatches, 2 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1296 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=6991, Invalid=11641, Unknown=0, NotChecked=0, Total=18632 [2018-11-07 22:16:01,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-11-07 22:16:01,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2018-11-07 22:16:01,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-11-07 22:16:01,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 151 transitions. [2018-11-07 22:16:01,756 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 151 transitions. Word has length 141 [2018-11-07 22:16:01,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:16:01,756 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 151 transitions. [2018-11-07 22:16:01,756 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-11-07 22:16:01,756 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 151 transitions. [2018-11-07 22:16:01,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-11-07 22:16:01,757 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:16:01,757 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:16:01,758 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:16:01,758 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:16:01,758 INFO L82 PathProgramCache]: Analyzing trace with hash -72493449, now seen corresponding path program 16 times [2018-11-07 22:16:01,758 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:16:01,759 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:01,759 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:16:01,759 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:01,759 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:16:01,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:03,111 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:03,111 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:03,111 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:16:03,111 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:16:03,112 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:16:03,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:03,112 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:16:03,120 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:16:03,121 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:16:03,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:03,291 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:16:03,630 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:03,630 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:16:07,003 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:07,023 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:16:07,023 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 98 [2018-11-07 22:16:07,023 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:16:07,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-11-07 22:16:07,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-11-07 22:16:07,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3395, Invalid=6111, Unknown=0, NotChecked=0, Total=9506 [2018-11-07 22:16:07,024 INFO L87 Difference]: Start difference. First operand 151 states and 151 transitions. Second operand 52 states. [2018-11-07 22:16:07,417 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 9 [2018-11-07 22:16:12,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:16:12,636 INFO L93 Difference]: Finished difference Result 165 states and 167 transitions. [2018-11-07 22:16:12,644 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-11-07 22:16:12,644 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 150 [2018-11-07 22:16:12,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:16:12,645 INFO L225 Difference]: With dead ends: 165 [2018-11-07 22:16:12,645 INFO L226 Difference]: Without dead ends: 160 [2018-11-07 22:16:12,647 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 251 SyntacticMatches, 2 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1455 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=7960, Invalid=13210, Unknown=0, NotChecked=0, Total=21170 [2018-11-07 22:16:12,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-11-07 22:16:12,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2018-11-07 22:16:12,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-11-07 22:16:12,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 160 transitions. [2018-11-07 22:16:12,653 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 160 transitions. Word has length 150 [2018-11-07 22:16:12,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:16:12,654 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 160 transitions. [2018-11-07 22:16:12,654 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-11-07 22:16:12,654 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 160 transitions. [2018-11-07 22:16:12,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-11-07 22:16:12,655 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:16:12,655 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:16:12,655 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:16:12,655 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:16:12,655 INFO L82 PathProgramCache]: Analyzing trace with hash 266268419, now seen corresponding path program 17 times [2018-11-07 22:16:12,655 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:16:12,656 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:12,656 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:16:12,656 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:12,656 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:16:12,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:14,095 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:14,095 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:14,095 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:16:14,095 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:16:14,095 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:16:14,096 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:14,096 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:16:14,105 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:16:14,105 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:16:14,157 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2018-11-07 22:16:14,157 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:16:14,161 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:16:14,336 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:14,336 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:16:18,148 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:18,170 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:16:18,171 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 104 [2018-11-07 22:16:18,171 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:16:18,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-11-07 22:16:18,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-11-07 22:16:18,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3836, Invalid=6876, Unknown=0, NotChecked=0, Total=10712 [2018-11-07 22:16:18,172 INFO L87 Difference]: Start difference. First operand 160 states and 160 transitions. Second operand 55 states. [2018-11-07 22:16:18,574 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 9 [2018-11-07 22:16:18,702 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 22:16:18,836 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 22:16:24,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:16:24,313 INFO L93 Difference]: Finished difference Result 174 states and 176 transitions. [2018-11-07 22:16:24,313 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-11-07 22:16:24,313 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 159 [2018-11-07 22:16:24,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:16:24,314 INFO L225 Difference]: With dead ends: 174 [2018-11-07 22:16:24,314 INFO L226 Difference]: Without dead ends: 169 [2018-11-07 22:16:24,315 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 266 SyntacticMatches, 2 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1623 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=8992, Invalid=14878, Unknown=0, NotChecked=0, Total=23870 [2018-11-07 22:16:24,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-11-07 22:16:24,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-11-07 22:16:24,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-11-07 22:16:24,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 169 transitions. [2018-11-07 22:16:24,322 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 169 transitions. Word has length 159 [2018-11-07 22:16:24,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:16:24,323 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 169 transitions. [2018-11-07 22:16:24,323 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-11-07 22:16:24,323 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 169 transitions. [2018-11-07 22:16:24,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-11-07 22:16:24,324 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:16:24,324 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:16:24,324 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:16:24,324 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:16:24,325 INFO L82 PathProgramCache]: Analyzing trace with hash -1651330057, now seen corresponding path program 18 times [2018-11-07 22:16:24,325 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:16:24,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:24,325 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:16:24,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:24,326 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:16:24,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:25,953 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:25,954 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:25,954 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:16:25,954 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:16:25,954 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:16:25,954 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:25,954 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:16:25,966 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:16:25,966 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:16:26,056 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:16:26,057 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:16:26,085 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:16:26,364 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:26,364 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:16:30,272 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:30,293 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:16:30,293 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 110 [2018-11-07 22:16:30,293 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:16:30,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-11-07 22:16:30,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-11-07 22:16:30,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4304, Invalid=7686, Unknown=0, NotChecked=0, Total=11990 [2018-11-07 22:16:30,295 INFO L87 Difference]: Start difference. First operand 169 states and 169 transitions. Second operand 58 states. [2018-11-07 22:16:30,461 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 8 [2018-11-07 22:16:30,580 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 8 [2018-11-07 22:16:30,716 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 9 [2018-11-07 22:16:30,858 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 22:16:31,000 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 22:16:31,155 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 22:16:31,317 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 22:16:31,486 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 22:16:31,635 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-07 22:16:37,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:16:37,524 INFO L93 Difference]: Finished difference Result 183 states and 185 transitions. [2018-11-07 22:16:37,524 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-11-07 22:16:37,524 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 168 [2018-11-07 22:16:37,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:16:37,526 INFO L225 Difference]: With dead ends: 183 [2018-11-07 22:16:37,526 INFO L226 Difference]: Without dead ends: 178 [2018-11-07 22:16:37,527 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 281 SyntacticMatches, 2 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1800 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=10087, Invalid=16645, Unknown=0, NotChecked=0, Total=26732 [2018-11-07 22:16:37,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-11-07 22:16:37,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2018-11-07 22:16:37,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-11-07 22:16:37,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 178 transitions. [2018-11-07 22:16:37,536 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 178 transitions. Word has length 168 [2018-11-07 22:16:37,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:16:37,536 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 178 transitions. [2018-11-07 22:16:37,536 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-11-07 22:16:37,536 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 178 transitions. [2018-11-07 22:16:37,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-11-07 22:16:37,537 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:16:37,538 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:16:37,538 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:16:37,538 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:16:37,538 INFO L82 PathProgramCache]: Analyzing trace with hash -639942269, now seen corresponding path program 19 times [2018-11-07 22:16:37,538 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:16:37,539 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:37,539 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:16:37,539 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:37,539 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:16:37,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:39,700 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:39,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:39,700 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:16:39,701 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:16:39,701 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:16:39,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:39,701 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:16:39,709 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:16:39,710 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:16:39,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:39,977 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:16:40,250 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:40,250 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:16:44,673 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:44,694 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:16:44,694 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 116 [2018-11-07 22:16:44,694 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:16:44,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-11-07 22:16:44,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-11-07 22:16:44,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4799, Invalid=8541, Unknown=0, NotChecked=0, Total=13340 [2018-11-07 22:16:44,696 INFO L87 Difference]: Start difference. First operand 178 states and 178 transitions. Second operand 61 states. [2018-11-07 22:16:44,908 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 8 [2018-11-07 22:16:45,037 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 168 DAG size of output: 8 [2018-11-07 22:16:45,184 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 9 [2018-11-07 22:16:45,332 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 22:16:45,489 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 22:16:45,645 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 22:16:45,804 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 22:16:45,964 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 22:16:46,128 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 22:16:46,285 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 22:16:46,462 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 22:16:46,678 WARN L179 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-07 22:16:52,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:16:52,922 INFO L93 Difference]: Finished difference Result 192 states and 194 transitions. [2018-11-07 22:16:52,922 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-11-07 22:16:52,922 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 177 [2018-11-07 22:16:52,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:16:52,924 INFO L225 Difference]: With dead ends: 192 [2018-11-07 22:16:52,924 INFO L226 Difference]: Without dead ends: 187 [2018-11-07 22:16:52,926 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 296 SyntacticMatches, 2 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1986 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=11245, Invalid=18511, Unknown=0, NotChecked=0, Total=29756 [2018-11-07 22:16:52,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-11-07 22:16:52,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2018-11-07 22:16:52,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-11-07 22:16:52,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 187 transitions. [2018-11-07 22:16:52,934 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 187 transitions. Word has length 177 [2018-11-07 22:16:52,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:16:52,934 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 187 transitions. [2018-11-07 22:16:52,934 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-11-07 22:16:52,934 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 187 transitions. [2018-11-07 22:16:52,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-11-07 22:16:52,935 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:16:52,935 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:16:52,936 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:16:52,936 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:16:52,936 INFO L82 PathProgramCache]: Analyzing trace with hash -99929737, now seen corresponding path program 20 times [2018-11-07 22:16:52,936 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:16:52,937 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:52,937 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:16:52,937 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:16:52,937 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:16:53,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:16:55,069 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:55,069 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:55,069 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:16:55,069 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:16:55,070 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:16:55,070 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:16:55,070 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:16:55,087 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:16:55,087 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:16:55,225 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2018-11-07 22:16:55,225 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:16:55,230 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:16:55,415 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:16:55,416 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:00,384 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:00,417 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:00,418 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 122 [2018-11-07 22:17:00,418 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:00,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-11-07 22:17:00,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-11-07 22:17:00,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5321, Invalid=9441, Unknown=0, NotChecked=0, Total=14762 [2018-11-07 22:17:00,420 INFO L87 Difference]: Start difference. First operand 187 states and 187 transitions. Second operand 64 states. [2018-11-07 22:17:00,676 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 8 [2018-11-07 22:17:00,820 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 8 [2018-11-07 22:17:00,984 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 9 [2018-11-07 22:17:01,149 WARN L179 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-07 22:17:01,313 WARN L179 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-07 22:17:01,481 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-07 22:17:01,652 WARN L179 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 22:17:01,843 WARN L179 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 22:17:02,026 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 22:17:02,213 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 22:17:02,389 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 22:17:02,560 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 22:17:02,734 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 22:17:02,909 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 22:17:03,098 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-07 22:17:03,280 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-11-07 22:17:09,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:09,840 INFO L93 Difference]: Finished difference Result 201 states and 203 transitions. [2018-11-07 22:17:09,842 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-11-07 22:17:09,842 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 186 [2018-11-07 22:17:09,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:09,844 INFO L225 Difference]: With dead ends: 201 [2018-11-07 22:17:09,844 INFO L226 Difference]: Without dead ends: 196 [2018-11-07 22:17:09,846 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 311 SyntacticMatches, 2 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2181 ImplicationChecksByTransitivity, 15.5s TimeCoverageRelationStatistics Valid=12466, Invalid=20476, Unknown=0, NotChecked=0, Total=32942 [2018-11-07 22:17:09,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-11-07 22:17:09,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2018-11-07 22:17:09,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-11-07 22:17:09,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 196 transitions. [2018-11-07 22:17:09,854 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 196 transitions. Word has length 186 [2018-11-07 22:17:09,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:09,854 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 196 transitions. [2018-11-07 22:17:09,854 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-11-07 22:17:09,854 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 196 transitions. [2018-11-07 22:17:09,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-11-07 22:17:09,855 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:09,856 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:09,856 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:09,856 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:09,856 INFO L82 PathProgramCache]: Analyzing trace with hash 89650179, now seen corresponding path program 21 times [2018-11-07 22:17:09,856 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:09,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:09,857 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:09,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:09,857 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:10,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:12,584 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:12,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:12,584 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:12,585 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:12,585 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:12,585 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:12,585 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:17:12,593 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:17:12,593 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:17:12,750 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:17:12,751 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:12,824 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:13,122 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:13,123 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:18,645 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:18,665 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:18,665 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 128 [2018-11-07 22:17:18,665 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:18,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-11-07 22:17:18,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-11-07 22:17:18,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5870, Invalid=10386, Unknown=0, NotChecked=0, Total=16256 [2018-11-07 22:17:18,667 INFO L87 Difference]: Start difference. First operand 196 states and 196 transitions. Second operand 67 states. [2018-11-07 22:17:18,891 WARN L179 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 8 [2018-11-07 22:17:19,040 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 186 DAG size of output: 8 [2018-11-07 22:17:19,211 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 9 [2018-11-07 22:17:19,385 WARN L179 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-11-07 22:17:19,558 WARN L179 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-11-07 22:17:19,746 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-11-07 22:17:19,926 WARN L179 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-07 22:17:20,111 WARN L179 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-07 22:17:20,298 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-07 22:17:20,484 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 22:17:20,674 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 22:17:20,863 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 22:17:21,053 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 22:17:21,238 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 22:17:21,426 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 22:17:21,619 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 22:17:21,803 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 22:17:22,100 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-07 22:17:22,299 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-11-07 22:17:22,503 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-11-07 22:17:29,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:29,069 INFO L93 Difference]: Finished difference Result 210 states and 212 transitions. [2018-11-07 22:17:29,069 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-11-07 22:17:29,070 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 195 [2018-11-07 22:17:29,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:29,071 INFO L225 Difference]: With dead ends: 210 [2018-11-07 22:17:29,071 INFO L226 Difference]: Without dead ends: 205 [2018-11-07 22:17:29,072 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 326 SyntacticMatches, 2 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2385 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=13750, Invalid=22540, Unknown=0, NotChecked=0, Total=36290 [2018-11-07 22:17:29,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-11-07 22:17:29,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2018-11-07 22:17:29,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-11-07 22:17:29,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 205 transitions. [2018-11-07 22:17:29,080 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 205 transitions. Word has length 195 [2018-11-07 22:17:29,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:29,081 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 205 transitions. [2018-11-07 22:17:29,081 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-11-07 22:17:29,081 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 205 transitions. [2018-11-07 22:17:29,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-11-07 22:17:29,082 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:29,082 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:29,082 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:29,082 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:29,082 INFO L82 PathProgramCache]: Analyzing trace with hash 795823863, now seen corresponding path program 22 times [2018-11-07 22:17:29,082 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:29,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:29,083 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:29,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:29,083 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:29,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:31,602 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:31,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:31,603 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:31,603 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:31,603 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:31,603 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:31,603 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:17:31,611 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:31,611 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:17:31,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:32,020 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:32,246 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:32,247 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:38,517 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:38,537 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:38,537 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 134 [2018-11-07 22:17:38,537 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:38,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-11-07 22:17:38,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-11-07 22:17:38,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6446, Invalid=11376, Unknown=0, NotChecked=0, Total=17822 [2018-11-07 22:17:38,539 INFO L87 Difference]: Start difference. First operand 205 states and 205 transitions. Second operand 70 states. [2018-11-07 22:17:38,773 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 8 [2018-11-07 22:17:38,936 WARN L179 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 8 [2018-11-07 22:17:39,123 WARN L179 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 9 [2018-11-07 22:17:39,305 WARN L179 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-11-07 22:17:39,501 WARN L179 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-11-07 22:17:39,690 WARN L179 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-11-07 22:17:39,883 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-11-07 22:17:40,082 WARN L179 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-11-07 22:17:40,275 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-11-07 22:17:40,475 WARN L179 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-07 22:17:40,678 WARN L179 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-07 22:17:40,879 WARN L179 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-07 22:17:41,082 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 22:17:41,281 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 22:17:41,486 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 22:17:41,684 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 22:17:41,882 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 22:17:42,084 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 22:17:42,283 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 22:17:42,477 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 22:17:42,879 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-11-07 22:17:43,104 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-11-07 22:17:45,714 WARN L179 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 11 [2018-11-07 22:17:50,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:50,115 INFO L93 Difference]: Finished difference Result 219 states and 221 transitions. [2018-11-07 22:17:50,115 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-11-07 22:17:50,116 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 204 [2018-11-07 22:17:50,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:50,117 INFO L225 Difference]: With dead ends: 219 [2018-11-07 22:17:50,117 INFO L226 Difference]: Without dead ends: 214 [2018-11-07 22:17:50,119 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 541 GetRequests, 341 SyntacticMatches, 2 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2598 ImplicationChecksByTransitivity, 19.6s TimeCoverageRelationStatistics Valid=15097, Invalid=24703, Unknown=0, NotChecked=0, Total=39800 [2018-11-07 22:17:50,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-11-07 22:17:50,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 214. [2018-11-07 22:17:50,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2018-11-07 22:17:50,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 214 transitions. [2018-11-07 22:17:50,127 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 214 transitions. Word has length 204 [2018-11-07 22:17:50,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:50,128 INFO L480 AbstractCegarLoop]: Abstraction has 214 states and 214 transitions. [2018-11-07 22:17:50,128 INFO L481 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-11-07 22:17:50,128 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 214 transitions. [2018-11-07 22:17:50,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2018-11-07 22:17:50,129 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:50,129 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:50,130 INFO L423 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:50,130 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:50,130 INFO L82 PathProgramCache]: Analyzing trace with hash 385681027, now seen corresponding path program 23 times [2018-11-07 22:17:50,130 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:50,131 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:50,131 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:50,131 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:50,131 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:50,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:52,711 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:52,711 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:52,712 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:52,712 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:52,712 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:52,712 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:52,712 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:17:52,720 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:17:52,720 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:17:52,844 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 68 check-sat command(s) [2018-11-07 22:17:52,844 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:52,850 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:53,136 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:53,136 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:59,892 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:17:59,912 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:59,912 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 140 [2018-11-07 22:17:59,912 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:59,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-11-07 22:17:59,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-11-07 22:17:59,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7049, Invalid=12411, Unknown=0, NotChecked=0, Total=19460 [2018-11-07 22:17:59,914 INFO L87 Difference]: Start difference. First operand 214 states and 214 transitions. Second operand 73 states. [2018-11-07 22:18:00,685 WARN L179 SmtUtils]: Spent 335.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 8 [2018-11-07 22:18:00,857 WARN L179 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 8 [2018-11-07 22:18:01,053 WARN L179 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 210 DAG size of output: 9 [2018-11-07 22:18:01,250 WARN L179 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-11-07 22:18:01,450 WARN L179 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-11-07 22:18:01,658 WARN L179 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-11-07 22:18:01,875 WARN L179 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-11-07 22:18:02,088 WARN L179 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-11-07 22:18:02,300 WARN L179 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-11-07 22:18:02,516 WARN L179 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-11-07 22:18:02,734 WARN L179 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-11-07 22:18:02,946 WARN L179 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-11-07 22:18:03,158 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-07 22:18:03,400 WARN L179 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-07 22:18:03,638 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-07 22:18:03,850 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 22:18:04,136 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 22:18:05,216 WARN L179 SmtUtils]: Spent 588.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 22:18:05,436 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 22:18:05,661 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 22:18:05,878 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 22:18:06,087 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 22:18:06,304 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 22:18:06,950 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-11-07 22:18:14,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:14,549 INFO L93 Difference]: Finished difference Result 228 states and 230 transitions. [2018-11-07 22:18:14,551 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-11-07 22:18:14,551 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 213 [2018-11-07 22:18:14,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:14,552 INFO L225 Difference]: With dead ends: 228 [2018-11-07 22:18:14,552 INFO L226 Difference]: Without dead ends: 223 [2018-11-07 22:18:14,554 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 565 GetRequests, 356 SyntacticMatches, 2 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2820 ImplicationChecksByTransitivity, 22.7s TimeCoverageRelationStatistics Valid=16507, Invalid=26965, Unknown=0, NotChecked=0, Total=43472 [2018-11-07 22:18:14,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-11-07 22:18:14,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 223. [2018-11-07 22:18:14,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2018-11-07 22:18:14,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 223 transitions. [2018-11-07 22:18:14,564 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 223 transitions. Word has length 213 [2018-11-07 22:18:14,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:14,564 INFO L480 AbstractCegarLoop]: Abstraction has 223 states and 223 transitions. [2018-11-07 22:18:14,564 INFO L481 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-11-07 22:18:14,564 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 223 transitions. [2018-11-07 22:18:14,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-11-07 22:18:14,565 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:14,566 INFO L375 BasicCegarLoop]: trace histogram [71, 70, 70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:14,566 INFO L423 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:14,566 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:14,566 INFO L82 PathProgramCache]: Analyzing trace with hash 1981222007, now seen corresponding path program 24 times [2018-11-07 22:18:14,566 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:14,567 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:14,567 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:18:14,567 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:14,567 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:14,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:17,704 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:17,704 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:17,704 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:17,705 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:17,705 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:17,705 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:17,705 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:18:17,714 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:18:17,714 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:18:17,968 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:18:17,968 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:18:18,100 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:18,427 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:18,428 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:26,024 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:26,044 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:26,044 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 146 [2018-11-07 22:18:26,044 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:26,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 76 states [2018-11-07 22:18:26,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2018-11-07 22:18:26,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7679, Invalid=13491, Unknown=0, NotChecked=0, Total=21170 [2018-11-07 22:18:26,048 INFO L87 Difference]: Start difference. First operand 223 states and 223 transitions. Second operand 76 states. [2018-11-07 22:18:26,395 WARN L179 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 210 DAG size of output: 8 [2018-11-07 22:18:26,572 WARN L179 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 8 [2018-11-07 22:18:26,783 WARN L179 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 9 [2018-11-07 22:18:27,000 WARN L179 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-11-07 22:18:27,218 WARN L179 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-11-07 22:18:27,437 WARN L179 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-11-07 22:18:27,654 WARN L179 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-11-07 22:18:27,895 WARN L179 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-11-07 22:18:28,118 WARN L179 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-11-07 22:18:28,350 WARN L179 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-11-07 22:18:28,584 WARN L179 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-11-07 22:18:28,812 WARN L179 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-11-07 22:18:29,062 WARN L179 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-11-07 22:18:29,317 WARN L179 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-11-07 22:18:29,542 WARN L179 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-11-07 22:18:29,773 WARN L179 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-07 22:18:30,003 WARN L179 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-07 22:18:30,237 WARN L179 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-07 22:18:30,465 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 22:18:30,702 WARN L179 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 22:18:30,935 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 22:18:31,169 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 22:18:31,406 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 22:18:31,639 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 22:18:31,863 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 22:18:32,095 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 22:18:32,326 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-07 22:18:33,009 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-11-07 22:18:40,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:40,452 INFO L93 Difference]: Finished difference Result 237 states and 239 transitions. [2018-11-07 22:18:40,452 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-11-07 22:18:40,453 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 222 [2018-11-07 22:18:40,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:40,454 INFO L225 Difference]: With dead ends: 237 [2018-11-07 22:18:40,455 INFO L226 Difference]: Without dead ends: 232 [2018-11-07 22:18:40,456 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 589 GetRequests, 371 SyntacticMatches, 2 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3051 ImplicationChecksByTransitivity, 24.2s TimeCoverageRelationStatistics Valid=17980, Invalid=29326, Unknown=0, NotChecked=0, Total=47306 [2018-11-07 22:18:40,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2018-11-07 22:18:40,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 232. [2018-11-07 22:18:40,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2018-11-07 22:18:40,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 232 transitions. [2018-11-07 22:18:40,465 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 232 transitions. Word has length 222 [2018-11-07 22:18:40,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:40,465 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 232 transitions. [2018-11-07 22:18:40,465 INFO L481 AbstractCegarLoop]: Interpolant automaton has 76 states. [2018-11-07 22:18:40,466 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 232 transitions. [2018-11-07 22:18:40,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2018-11-07 22:18:40,467 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:40,467 INFO L375 BasicCegarLoop]: trace histogram [74, 73, 73, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:40,467 INFO L423 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:40,467 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:40,468 INFO L82 PathProgramCache]: Analyzing trace with hash -1183680253, now seen corresponding path program 25 times [2018-11-07 22:18:40,468 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:40,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:40,468 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:18:40,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:40,469 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:40,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:44,697 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:44,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:44,697 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:44,698 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:44,698 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:44,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:44,698 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:18:44,707 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:44,707 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:18:45,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:45,308 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:45,547 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:45,548 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:53,266 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:53,287 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:53,287 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 152 [2018-11-07 22:18:53,287 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:53,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-11-07 22:18:53,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-11-07 22:18:53,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8336, Invalid=14616, Unknown=0, NotChecked=0, Total=22952 [2018-11-07 22:18:53,290 INFO L87 Difference]: Start difference. First operand 232 states and 232 transitions. Second operand 79 states. [2018-11-07 22:18:53,564 WARN L179 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 8 [2018-11-07 22:18:53,759 WARN L179 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 222 DAG size of output: 8 [2018-11-07 22:18:53,982 WARN L179 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 228 DAG size of output: 9 [2018-11-07 22:18:54,227 WARN L179 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-11-07 22:18:54,466 WARN L179 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-11-07 22:18:54,721 WARN L179 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-11-07 22:18:54,968 WARN L179 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-11-07 22:18:55,209 WARN L179 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-11-07 22:18:55,444 WARN L179 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-11-07 22:18:55,686 WARN L179 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-11-07 22:18:55,930 WARN L179 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-11-07 22:18:56,168 WARN L179 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-11-07 22:18:56,415 WARN L179 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-11-07 22:18:56,708 WARN L179 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-11-07 22:18:56,957 WARN L179 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-11-07 22:18:57,229 WARN L179 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-11-07 22:18:57,471 WARN L179 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-11-07 22:18:57,726 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-11-07 22:18:57,968 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-07 22:18:58,221 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-07 22:18:58,476 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-07 22:18:58,730 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 22:18:58,982 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 22:18:59,223 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 22:18:59,461 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 22:18:59,720 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 22:18:59,978 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 22:19:00,220 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 22:19:00,469 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 22:19:00,723 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-07 22:19:00,965 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 Received shutdown request... [2018-11-07 22:19:06,358 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-11-07 22:19:06,358 WARN L549 AbstractCegarLoop]: Verification canceled [2018-11-07 22:19:06,363 WARN L205 ceAbstractionStarter]: Timeout [2018-11-07 22:19:06,363 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 10:19:06 BoogieIcfgContainer [2018-11-07 22:19:06,363 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-07 22:19:06,364 INFO L168 Benchmark]: Toolchain (without parser) took 248532.33 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 753.9 MB). Free memory was 1.4 GB in the beginning and 2.0 GB in the end (delta: -574.2 MB). Peak memory consumption was 179.7 MB. Max. memory is 7.1 GB. [2018-11-07 22:19:06,364 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 22:19:06,365 INFO L168 Benchmark]: CACSL2BoogieTranslator took 351.69 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. [2018-11-07 22:19:06,365 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.22 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. [2018-11-07 22:19:06,365 INFO L168 Benchmark]: Boogie Preprocessor took 21.51 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. [2018-11-07 22:19:06,365 INFO L168 Benchmark]: RCFGBuilder took 468.66 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 723.0 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -773.9 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. [2018-11-07 22:19:06,366 INFO L168 Benchmark]: TraceAbstraction took 247661.46 ms. Allocated memory was 2.3 GB in the beginning and 2.3 GB in the end (delta: 30.9 MB). Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 189.1 MB). Peak memory consumption was 220.1 MB. Max. memory is 7.1 GB. [2018-11-07 22:19:06,368 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 351.69 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 24.22 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 21.51 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 468.66 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 723.0 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -773.9 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 247661.46 ms. Allocated memory was 2.3 GB in the beginning and 2.3 GB in the end (delta: 30.9 MB). Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 189.1 MB). Peak memory consumption was 220.1 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 (232states) and FLOYD_HOARE automaton (currently 57 states, 79 states before enhancement),while PredicateComparison was comparing new predicate (quantifier-free) to 207 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. TIMEOUT Result, 247.5s OverallTime, 27 OverallIterations, 74 TraceHistogramMax, 129.9s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 352 SDtfs, 3993 SDslu, 8701 SDs, 0 SdLazy, 4099 SolverSat, 2471 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 6.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 8113 GetRequests, 5154 SyntacticMatches, 50 SemanticMatches, 2908 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29551 ImplicationChecksByTransitivity, 225.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=232occurred in iteration=26, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 26 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 5.2s SatisfiabilityAnalysisTime, 109.8s InterpolantComputationTime, 6173 NumberOfCodeBlocks, 6173 NumberOfCodeBlocksAsserted, 344 NumberOfCheckSat, 9171 ConstructedInterpolants, 74 QuantifiedInterpolants, 8659439 SizeOfPredicates, 75 NumberOfNonLiveVariables, 4425 ConjunctsInSsa, 1000 ConjunctsInUnsatCore, 77 InterpolantComputations, 2 PerfectInterpolantSequences, 0/208050 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown