java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf -i ../../../trunk/examples/svcomp/loop-acceleration/phases_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:28:40,180 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:28:40,182 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:28:40,193 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:28:40,194 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:28:40,195 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:28:40,196 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:28:40,198 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:28:40,200 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:28:40,201 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:28:40,202 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:28:40,202 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:28:40,203 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:28:40,204 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:28:40,205 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:28:40,206 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:28:40,207 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:28:40,209 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:28:40,211 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:28:40,212 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:28:40,214 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:28:40,215 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:28:40,217 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:28:40,218 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:28:40,218 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:28:40,219 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:28:40,220 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:28:40,221 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:28:40,222 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:28:40,223 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:28:40,223 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:28:40,224 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-24 12:28:40,227 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-24 12:28:40,244 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:28:40,245 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:28:40,245 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:28:40,246 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:28:40,246 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:28:40,246 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:28:40,246 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-24 12:28:40,246 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:28:40,247 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-24 12:28:40,247 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:28:40,247 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:28:40,247 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:28:40,247 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:28:40,248 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:28:40,248 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:28:40,248 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:28:40,249 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:28:40,249 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:28:40,249 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:28:40,249 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:28:40,249 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:28:40,249 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:28:40,250 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:28:40,250 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:28:40,250 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:28:40,250 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:28:40,250 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:28:40,251 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:28:40,251 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:28:40,251 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:28:40,251 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:28:40,251 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:28:40,252 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:28:40,252 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:28:40,252 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:28:40,252 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:28:40,294 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:28:40,312 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:28:40,316 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:28:40,317 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:28:40,318 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:28:40,318 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/phases_false-unreach-call1.i [2018-10-24 12:28:40,375 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/1b1cb9e06/ef939d9890184242b7ee77008fab76a9/FLAG5f91916a9 [2018-10-24 12:28:40,813 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:28:40,814 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_false-unreach-call1.i [2018-10-24 12:28:40,819 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/1b1cb9e06/ef939d9890184242b7ee77008fab76a9/FLAG5f91916a9 [2018-10-24 12:28:40,834 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/1b1cb9e06/ef939d9890184242b7ee77008fab76a9 [2018-10-24 12:28:40,845 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:28:40,846 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:28:40,847 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:28:40,847 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:28:40,855 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:28:40,856 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:28:40" (1/1) ... [2018-10-24 12:28:40,858 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3b3e367d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:40, skipping insertion in model container [2018-10-24 12:28:40,859 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:28:40" (1/1) ... [2018-10-24 12:28:40,867 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:28:40,888 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:28:41,074 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:28:41,079 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:28:41,096 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:28:41,111 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:28:41,112 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:41 WrapperNode [2018-10-24 12:28:41,112 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:28:41,113 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:28:41,113 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:28:41,113 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:28:41,123 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:41" (1/1) ... [2018-10-24 12:28:41,128 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:41" (1/1) ... [2018-10-24 12:28:41,134 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:28:41,135 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:28:41,135 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:28:41,135 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:28:41,145 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:41" (1/1) ... [2018-10-24 12:28:41,145 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:41" (1/1) ... [2018-10-24 12:28:41,146 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:41" (1/1) ... [2018-10-24 12:28:41,146 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:41" (1/1) ... [2018-10-24 12:28:41,149 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:41" (1/1) ... [2018-10-24 12:28:41,155 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:41" (1/1) ... [2018-10-24 12:28:41,155 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:41" (1/1) ... [2018-10-24 12:28:41,157 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:28:41,157 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:28:41,157 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:28:41,158 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:28:41,158 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:41" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:28:41,234 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:28:41,234 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:28:41,234 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:28:41,234 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:28:41,235 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:28:41,235 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:28:41,235 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:28:41,235 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:28:41,508 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:28:41,509 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:28:41 BoogieIcfgContainer [2018-10-24 12:28:41,509 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:28:41,510 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:28:41,510 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:28:41,513 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:28:41,514 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:28:40" (1/3) ... [2018-10-24 12:28:41,514 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ac0c473 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:28:41, skipping insertion in model container [2018-10-24 12:28:41,515 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:41" (2/3) ... [2018-10-24 12:28:41,515 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ac0c473 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:28:41, skipping insertion in model container [2018-10-24 12:28:41,515 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:28:41" (3/3) ... [2018-10-24 12:28:41,517 INFO L112 eAbstractionObserver]: Analyzing ICFG phases_false-unreach-call1.i [2018-10-24 12:28:41,525 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:28:41,533 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:28:41,551 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:28:41,583 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:28:41,584 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:28:41,584 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:28:41,584 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:28:41,584 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:28:41,584 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:28:41,584 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:28:41,585 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:28:41,603 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-10-24 12:28:41,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-24 12:28:41,610 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:41,611 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:41,613 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:41,620 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:41,620 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-10-24 12:28:41,623 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:41,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:41,673 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:41,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:41,673 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:41,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:41,724 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:41,726 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:28:41,726 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:28:41,727 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:28:41,731 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:28:41,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:28:41,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:28:41,747 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-10-24 12:28:41,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:41,774 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-24 12:28:41,774 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:28:41,775 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-24 12:28:41,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:41,783 INFO L225 Difference]: With dead ends: 30 [2018-10-24 12:28:41,783 INFO L226 Difference]: Without dead ends: 13 [2018-10-24 12:28:41,786 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:28:41,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-24 12:28:41,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-24 12:28:41,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-24 12:28:41,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-10-24 12:28:41,824 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-10-24 12:28:41,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:41,825 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-10-24 12:28:41,825 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:28:41,825 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-10-24 12:28:41,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-24 12:28:41,826 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:41,826 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:41,827 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:41,827 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:41,827 INFO L82 PathProgramCache]: Analyzing trace with hash 1144102878, now seen corresponding path program 1 times [2018-10-24 12:28:41,828 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:41,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:41,829 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:41,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:41,829 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:41,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:42,027 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:42,027 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:28:42,028 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:28:42,028 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:28:42,030 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:28:42,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:28:42,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:28:42,031 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-10-24 12:28:42,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:42,140 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2018-10-24 12:28:42,142 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:28:42,143 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-24 12:28:42,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:42,146 INFO L225 Difference]: With dead ends: 24 [2018-10-24 12:28:42,146 INFO L226 Difference]: Without dead ends: 16 [2018-10-24 12:28:42,149 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:28:42,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-24 12:28:42,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-24 12:28:42,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-24 12:28:42,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2018-10-24 12:28:42,162 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2018-10-24 12:28:42,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:42,162 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2018-10-24 12:28:42,162 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:28:42,162 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2018-10-24 12:28:42,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-24 12:28:42,163 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:42,164 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:42,164 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:42,164 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:42,164 INFO L82 PathProgramCache]: Analyzing trace with hash -2056921797, now seen corresponding path program 1 times [2018-10-24 12:28:42,165 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:42,171 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:42,171 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:42,171 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:42,172 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:42,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:42,386 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:42,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:42,387 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:42,388 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-24 12:28:42,391 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [26], [29], [31], [37], [38], [39], [41] [2018-10-24 12:28:42,431 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:28:42,431 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:28:42,622 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:28:42,623 INFO L272 AbstractInterpreter]: Visited 13 different actions 21 times. Merged at 3 different actions 6 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-10-24 12:28:42,643 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:42,644 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:28:42,644 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:42,645 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:42,656 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:42,657 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:42,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:42,690 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:42,753 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:42,754 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:42,834 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:42,858 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:42,858 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-24 12:28:42,858 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:42,859 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 12:28:42,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 12:28:42,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:28:42,860 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 4 states. [2018-10-24 12:28:42,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:42,943 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2018-10-24 12:28:42,944 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:28:42,944 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-24 12:28:42,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:42,945 INFO L225 Difference]: With dead ends: 27 [2018-10-24 12:28:42,945 INFO L226 Difference]: Without dead ends: 19 [2018-10-24 12:28:42,946 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:28:42,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-24 12:28:42,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-24 12:28:42,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-24 12:28:42,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-10-24 12:28:42,951 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2018-10-24 12:28:42,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:42,951 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-10-24 12:28:42,951 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 12:28:42,951 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-10-24 12:28:42,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 12:28:42,952 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:42,952 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:42,953 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:42,953 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:42,953 INFO L82 PathProgramCache]: Analyzing trace with hash 1670825662, now seen corresponding path program 2 times [2018-10-24 12:28:42,953 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:42,954 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:42,955 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:42,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:42,955 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:42,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:43,191 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:43,191 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:43,192 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:43,192 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:43,192 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:43,192 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:43,192 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:43,212 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:43,212 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:43,258 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-24 12:28:43,258 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:43,262 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:43,377 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-24 12:28:43,378 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:43,419 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-24 12:28:43,452 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-24 12:28:43,452 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 7 [2018-10-24 12:28:43,453 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:28:43,453 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:28:43,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:28:43,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:28:43,454 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 3 states. [2018-10-24 12:28:43,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:43,498 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2018-10-24 12:28:43,498 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:28:43,498 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-10-24 12:28:43,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:43,499 INFO L225 Difference]: With dead ends: 27 [2018-10-24 12:28:43,499 INFO L226 Difference]: Without dead ends: 22 [2018-10-24 12:28:43,500 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:28:43,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-24 12:28:43,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-10-24 12:28:43,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-24 12:28:43,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-10-24 12:28:43,508 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 17 [2018-10-24 12:28:43,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:43,508 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-10-24 12:28:43,508 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:28:43,508 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-10-24 12:28:43,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-24 12:28:43,509 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:43,509 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:43,510 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:43,510 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:43,510 INFO L82 PathProgramCache]: Analyzing trace with hash 1801011421, now seen corresponding path program 1 times [2018-10-24 12:28:43,510 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:43,511 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:43,511 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:43,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:43,512 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:43,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:43,698 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:43,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:43,698 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:43,698 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 21 with the following transitions: [2018-10-24 12:28:43,699 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-24 12:28:43,701 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:28:43,701 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:28:43,764 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:28:43,765 INFO L272 AbstractInterpreter]: Visited 14 different actions 24 times. Merged at 3 different actions 6 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 2 variables. [2018-10-24 12:28:43,774 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:43,774 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:28:43,774 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:43,774 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:43,783 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:43,783 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:43,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:43,810 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:43,863 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:43,863 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:44,155 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:44,182 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:44,182 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6] total 10 [2018-10-24 12:28:44,183 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:44,183 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:28:44,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:28:44,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:28:44,184 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 6 states. [2018-10-24 12:28:44,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:44,233 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-24 12:28:44,234 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:28:44,234 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-24 12:28:44,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:44,235 INFO L225 Difference]: With dead ends: 34 [2018-10-24 12:28:44,235 INFO L226 Difference]: Without dead ends: 24 [2018-10-24 12:28:44,236 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:28:44,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-24 12:28:44,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-24 12:28:44,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-24 12:28:44,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-10-24 12:28:44,242 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 20 [2018-10-24 12:28:44,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:44,242 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-10-24 12:28:44,242 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:28:44,242 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-10-24 12:28:44,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-24 12:28:44,243 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:44,243 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:44,244 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:44,244 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:44,244 INFO L82 PathProgramCache]: Analyzing trace with hash -2092450784, now seen corresponding path program 2 times [2018-10-24 12:28:44,244 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:44,245 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:44,245 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:44,246 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:44,246 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:44,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:44,430 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:44,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:44,431 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:44,431 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:44,432 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:44,432 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:44,432 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:44,445 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:44,445 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:44,489 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:28:44,489 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:44,491 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:44,824 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-24 12:28:44,825 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:44,967 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-24 12:28:44,988 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:44,989 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4] total 11 [2018-10-24 12:28:44,989 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:44,989 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:28:44,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:28:44,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:28:44,990 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 9 states. [2018-10-24 12:28:45,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:45,167 INFO L93 Difference]: Finished difference Result 44 states and 51 transitions. [2018-10-24 12:28:45,168 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:28:45,168 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-10-24 12:28:45,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:45,169 INFO L225 Difference]: With dead ends: 44 [2018-10-24 12:28:45,169 INFO L226 Difference]: Without dead ends: 34 [2018-10-24 12:28:45,170 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:28:45,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-24 12:28:45,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2018-10-24 12:28:45,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-24 12:28:45,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2018-10-24 12:28:45,176 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 23 [2018-10-24 12:28:45,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:45,176 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2018-10-24 12:28:45,176 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:28:45,177 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2018-10-24 12:28:45,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-24 12:28:45,177 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:45,178 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:45,178 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:45,178 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:45,178 INFO L82 PathProgramCache]: Analyzing trace with hash -1050905282, now seen corresponding path program 3 times [2018-10-24 12:28:45,178 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:45,180 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:45,180 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:45,180 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:45,180 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:45,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:45,370 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:45,370 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:45,370 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:45,371 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:45,371 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:45,371 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:45,371 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:45,379 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:45,379 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:45,393 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:45,393 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:45,396 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:45,435 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:28:45,435 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:45,780 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:28:45,801 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:45,801 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 8] total 15 [2018-10-24 12:28:45,802 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:45,802 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:28:45,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:28:45,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:28:45,803 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 9 states. [2018-10-24 12:28:45,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:45,931 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2018-10-24 12:28:45,931 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:28:45,932 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-10-24 12:28:45,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:45,933 INFO L225 Difference]: With dead ends: 46 [2018-10-24 12:28:45,933 INFO L226 Difference]: Without dead ends: 33 [2018-10-24 12:28:45,934 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:28:45,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-24 12:28:45,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-10-24 12:28:45,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-24 12:28:45,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2018-10-24 12:28:45,940 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 29 [2018-10-24 12:28:45,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:45,941 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2018-10-24 12:28:45,941 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:28:45,941 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2018-10-24 12:28:45,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-24 12:28:45,942 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:45,942 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:45,942 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:45,942 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:45,943 INFO L82 PathProgramCache]: Analyzing trace with hash -306121381, now seen corresponding path program 4 times [2018-10-24 12:28:45,943 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:45,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:45,944 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:45,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:45,944 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:45,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:46,324 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:46,325 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:46,325 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:46,325 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:46,325 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:46,325 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:46,325 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:46,333 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:46,333 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:46,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:46,348 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:46,378 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:28:46,378 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:46,704 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:28:46,725 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:46,725 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 9] total 17 [2018-10-24 12:28:46,725 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:46,726 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:28:46,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:28:46,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:28:46,727 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 10 states. [2018-10-24 12:28:47,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:47,015 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2018-10-24 12:28:47,017 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:28:47,017 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-24 12:28:47,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:47,018 INFO L225 Difference]: With dead ends: 49 [2018-10-24 12:28:47,018 INFO L226 Difference]: Without dead ends: 36 [2018-10-24 12:28:47,019 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:28:47,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-24 12:28:47,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-24 12:28:47,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-24 12:28:47,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2018-10-24 12:28:47,025 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 32 [2018-10-24 12:28:47,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:47,025 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2018-10-24 12:28:47,026 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:28:47,026 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2018-10-24 12:28:47,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-24 12:28:47,027 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:47,027 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:47,027 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:47,027 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:47,028 INFO L82 PathProgramCache]: Analyzing trace with hash -249977826, now seen corresponding path program 5 times [2018-10-24 12:28:47,028 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:47,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:47,029 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:47,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:47,029 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:47,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:47,203 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:47,203 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:47,203 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:47,203 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:47,203 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:47,203 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:47,204 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:47,213 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:47,213 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:47,228 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-24 12:28:47,229 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:47,232 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:47,345 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 48 proven. 7 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-24 12:28:47,345 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:47,453 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 48 proven. 7 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-24 12:28:47,475 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:47,475 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 5, 5] total 17 [2018-10-24 12:28:47,475 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:47,476 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:28:47,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:28:47,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=187, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:28:47,477 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2018-10-24 12:28:51,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:51,974 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2018-10-24 12:28:51,974 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:28:51,974 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2018-10-24 12:28:51,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:51,975 INFO L225 Difference]: With dead ends: 62 [2018-10-24 12:28:51,975 INFO L226 Difference]: Without dead ends: 49 [2018-10-24 12:28:51,976 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:28:51,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-24 12:28:51,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 42. [2018-10-24 12:28:51,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-24 12:28:51,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2018-10-24 12:28:51,982 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 35 [2018-10-24 12:28:51,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:51,983 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2018-10-24 12:28:51,983 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:28:51,983 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2018-10-24 12:28:51,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-24 12:28:51,984 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:51,984 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:51,984 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:51,985 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:51,985 INFO L82 PathProgramCache]: Analyzing trace with hash 607533056, now seen corresponding path program 6 times [2018-10-24 12:28:51,985 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:51,986 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:51,986 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:51,986 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:51,986 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:51,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:52,575 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:52,575 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:52,575 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:52,576 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:52,576 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:52,576 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:52,576 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:52,585 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:52,586 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:52,601 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:52,601 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:52,604 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:52,649 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:52,649 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:53,172 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:53,193 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:53,193 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 24 [2018-10-24 12:28:53,193 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:53,194 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:28:53,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:28:53,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=385, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:28:53,195 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand 13 states. [2018-10-24 12:28:53,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:53,510 INFO L93 Difference]: Finished difference Result 61 states and 68 transitions. [2018-10-24 12:28:53,510 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:28:53,511 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-10-24 12:28:53,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:53,513 INFO L225 Difference]: With dead ends: 61 [2018-10-24 12:28:53,513 INFO L226 Difference]: Without dead ends: 45 [2018-10-24 12:28:53,514 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 70 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=167, Invalid=385, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:28:53,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-24 12:28:53,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-10-24 12:28:53,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-24 12:28:53,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2018-10-24 12:28:53,521 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 41 [2018-10-24 12:28:53,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:53,521 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2018-10-24 12:28:53,521 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:28:53,522 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2018-10-24 12:28:53,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-24 12:28:53,522 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:53,523 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:53,523 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:53,523 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:53,523 INFO L82 PathProgramCache]: Analyzing trace with hash 1655862429, now seen corresponding path program 7 times [2018-10-24 12:28:53,523 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:53,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:53,524 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:53,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:53,524 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:53,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:53,917 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:53,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:53,917 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:53,917 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:53,917 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:53,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:53,918 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:53,925 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:53,925 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:53,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:53,951 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:54,006 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 72 proven. 108 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-24 12:28:54,007 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:54,534 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 72 proven. 108 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-24 12:28:54,555 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:54,555 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 12] total 24 [2018-10-24 12:28:54,555 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:54,556 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:28:54,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:28:54,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:28:54,556 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand 14 states. [2018-10-24 12:28:54,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:54,784 INFO L93 Difference]: Finished difference Result 64 states and 71 transitions. [2018-10-24 12:28:54,784 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:28:54,784 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-10-24 12:28:54,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:54,786 INFO L225 Difference]: With dead ends: 64 [2018-10-24 12:28:54,786 INFO L226 Difference]: Without dead ends: 48 [2018-10-24 12:28:54,787 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:28:54,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-24 12:28:54,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-24 12:28:54,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-24 12:28:54,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2018-10-24 12:28:54,793 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 44 [2018-10-24 12:28:54,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:54,794 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2018-10-24 12:28:54,794 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:28:54,794 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2018-10-24 12:28:54,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-24 12:28:54,795 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:54,795 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:54,795 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:54,795 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:54,796 INFO L82 PathProgramCache]: Analyzing trace with hash -565963040, now seen corresponding path program 8 times [2018-10-24 12:28:54,796 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:54,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:54,797 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:54,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:54,797 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:54,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:55,035 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:55,035 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:55,035 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:55,036 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:55,036 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:55,036 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:55,036 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:55,045 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:55,045 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:55,079 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:28:55,080 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:55,083 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:55,234 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 99 proven. 15 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-24 12:28:55,234 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:56,381 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 99 proven. 15 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-24 12:28:56,421 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:56,421 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 6, 6] total 23 [2018-10-24 12:28:56,421 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:56,422 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:28:56,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:28:56,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=359, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:28:56,423 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 19 states. [2018-10-24 12:29:00,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:00,147 INFO L93 Difference]: Finished difference Result 74 states and 85 transitions. [2018-10-24 12:29:00,147 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:29:00,148 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 47 [2018-10-24 12:29:00,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:00,149 INFO L225 Difference]: With dead ends: 74 [2018-10-24 12:29:00,149 INFO L226 Difference]: Without dead ends: 58 [2018-10-24 12:29:00,150 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=195, Invalid=455, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:29:00,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-24 12:29:00,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 54. [2018-10-24 12:29:00,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-24 12:29:00,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2018-10-24 12:29:00,157 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 47 [2018-10-24 12:29:00,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:00,158 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2018-10-24 12:29:00,158 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:29:00,158 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2018-10-24 12:29:00,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-24 12:29:00,159 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:00,159 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:00,159 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:00,160 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:00,160 INFO L82 PathProgramCache]: Analyzing trace with hash -829748866, now seen corresponding path program 9 times [2018-10-24 12:29:00,160 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:00,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:00,161 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:00,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:00,161 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:00,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:00,506 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:00,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:00,506 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:00,507 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:00,507 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:00,507 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:00,507 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:00,515 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:00,515 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:00,557 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:00,557 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:00,559 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:00,775 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 165 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:29:00,775 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:01,424 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 165 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:29:01,444 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:01,444 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13, 14] total 29 [2018-10-24 12:29:01,444 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:01,444 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:29:01,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:29:01,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=576, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:29:01,445 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand 17 states. [2018-10-24 12:29:01,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:01,729 INFO L93 Difference]: Finished difference Result 76 states and 85 transitions. [2018-10-24 12:29:01,730 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:29:01,730 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-10-24 12:29:01,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:01,731 INFO L225 Difference]: With dead ends: 76 [2018-10-24 12:29:01,731 INFO L226 Difference]: Without dead ends: 57 [2018-10-24 12:29:01,732 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 93 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=236, Invalid=576, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:29:01,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-24 12:29:01,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-10-24 12:29:01,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-24 12:29:01,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 61 transitions. [2018-10-24 12:29:01,740 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 61 transitions. Word has length 53 [2018-10-24 12:29:01,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:01,740 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 61 transitions. [2018-10-24 12:29:01,740 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:29:01,740 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 61 transitions. [2018-10-24 12:29:01,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-24 12:29:01,741 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:01,741 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:01,742 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:01,742 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:01,742 INFO L82 PathProgramCache]: Analyzing trace with hash 786973339, now seen corresponding path program 10 times [2018-10-24 12:29:01,742 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:01,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:01,743 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:01,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:01,743 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:01,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:02,331 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:02,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:02,331 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:02,331 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:02,331 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:02,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:02,332 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:02,340 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:02,340 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:02,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:02,368 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:02,511 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 132 proven. 198 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:29:02,511 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:03,711 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 132 proven. 198 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:29:03,732 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:03,732 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 14, 15] total 31 [2018-10-24 12:29:03,732 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:03,732 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:29:03,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:29:03,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=268, Invalid=662, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:29:03,733 INFO L87 Difference]: Start difference. First operand 57 states and 61 transitions. Second operand 18 states. [2018-10-24 12:29:04,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:04,136 INFO L93 Difference]: Finished difference Result 79 states and 88 transitions. [2018-10-24 12:29:04,137 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:29:04,137 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-10-24 12:29:04,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:04,138 INFO L225 Difference]: With dead ends: 79 [2018-10-24 12:29:04,138 INFO L226 Difference]: Without dead ends: 60 [2018-10-24 12:29:04,139 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 98 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=268, Invalid=662, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:29:04,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-24 12:29:04,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-10-24 12:29:04,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-24 12:29:04,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2018-10-24 12:29:04,145 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 56 [2018-10-24 12:29:04,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:04,145 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2018-10-24 12:29:04,145 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:29:04,146 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2018-10-24 12:29:04,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:29:04,147 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:04,147 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:04,147 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:04,147 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:04,147 INFO L82 PathProgramCache]: Analyzing trace with hash 794925150, now seen corresponding path program 11 times [2018-10-24 12:29:04,147 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:04,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:04,148 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:04,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:04,148 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:04,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:04,522 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:04,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:04,523 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:04,523 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:04,523 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:04,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:04,523 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:04,541 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:04,541 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:29:04,561 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-24 12:29:04,561 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:04,564 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:04,761 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 168 proven. 26 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-24 12:29:04,762 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:04,926 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 168 proven. 26 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-24 12:29:04,946 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:04,946 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 7, 7] total 29 [2018-10-24 12:29:04,947 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:04,947 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:29:04,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:29:04,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=587, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:29:04,948 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand 24 states. [2018-10-24 12:29:13,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:13,071 INFO L93 Difference]: Finished difference Result 89 states and 102 transitions. [2018-10-24 12:29:13,071 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:29:13,071 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 59 [2018-10-24 12:29:13,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:13,073 INFO L225 Difference]: With dead ends: 89 [2018-10-24 12:29:13,073 INFO L226 Difference]: Without dead ends: 70 [2018-10-24 12:29:13,074 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 112 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=305, Invalid=751, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:29:13,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-24 12:29:13,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 66. [2018-10-24 12:29:13,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-24 12:29:13,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 71 transitions. [2018-10-24 12:29:13,082 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 71 transitions. Word has length 59 [2018-10-24 12:29:13,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:13,082 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 71 transitions. [2018-10-24 12:29:13,082 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:29:13,083 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 71 transitions. [2018-10-24 12:29:13,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-24 12:29:13,084 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:13,084 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 13, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:13,084 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:13,084 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:13,084 INFO L82 PathProgramCache]: Analyzing trace with hash -1319222592, now seen corresponding path program 12 times [2018-10-24 12:29:13,085 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:13,085 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:13,085 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:13,085 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:13,086 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:13,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:13,568 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:13,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:13,568 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:13,569 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:13,569 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:13,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:13,569 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:13,581 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:13,581 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:13,626 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:13,626 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:13,628 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:13,693 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 273 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:29:13,694 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:15,001 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 273 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:29:15,021 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:15,030 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 16, 17] total 36 [2018-10-24 12:29:15,030 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:15,031 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:29:15,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:29:15,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=905, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:29:15,032 INFO L87 Difference]: Start difference. First operand 66 states and 71 transitions. Second operand 21 states. [2018-10-24 12:29:15,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:15,476 INFO L93 Difference]: Finished difference Result 91 states and 102 transitions. [2018-10-24 12:29:15,476 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:29:15,476 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-10-24 12:29:15,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:15,477 INFO L225 Difference]: With dead ends: 91 [2018-10-24 12:29:15,477 INFO L226 Difference]: Without dead ends: 69 [2018-10-24 12:29:15,479 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 114 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=355, Invalid=905, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:29:15,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-24 12:29:15,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-10-24 12:29:15,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-24 12:29:15,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 74 transitions. [2018-10-24 12:29:15,486 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 74 transitions. Word has length 65 [2018-10-24 12:29:15,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:15,486 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 74 transitions. [2018-10-24 12:29:15,486 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:29:15,486 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 74 transitions. [2018-10-24 12:29:15,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-24 12:29:15,487 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:15,487 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 14, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:15,488 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:15,488 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:15,488 INFO L82 PathProgramCache]: Analyzing trace with hash -1618626467, now seen corresponding path program 13 times [2018-10-24 12:29:15,488 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:15,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:15,489 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:15,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:15,489 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:15,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:16,138 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:16,139 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:16,139 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:16,139 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:16,139 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:16,139 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:16,139 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:16,147 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:16,147 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:16,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:16,174 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:16,223 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 210 proven. 315 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:29:16,223 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:17,505 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 210 proven. 315 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:29:17,525 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:17,525 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 17, 18] total 38 [2018-10-24 12:29:17,525 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:17,526 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:29:17,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:29:17,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=1012, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:29:17,527 INFO L87 Difference]: Start difference. First operand 69 states and 74 transitions. Second operand 22 states. [2018-10-24 12:29:18,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:18,298 INFO L93 Difference]: Finished difference Result 94 states and 105 transitions. [2018-10-24 12:29:18,298 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:29:18,298 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-10-24 12:29:18,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:18,299 INFO L225 Difference]: With dead ends: 94 [2018-10-24 12:29:18,300 INFO L226 Difference]: Without dead ends: 72 [2018-10-24 12:29:18,301 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 119 SyntacticMatches, 3 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=394, Invalid=1012, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:29:18,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-24 12:29:18,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-10-24 12:29:18,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-24 12:29:18,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2018-10-24 12:29:18,309 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 68 [2018-10-24 12:29:18,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:18,309 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2018-10-24 12:29:18,309 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:29:18,310 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2018-10-24 12:29:18,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-24 12:29:18,310 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:18,310 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 15, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:18,311 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:18,311 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:18,311 INFO L82 PathProgramCache]: Analyzing trace with hash -512392800, now seen corresponding path program 14 times [2018-10-24 12:29:18,311 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:18,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:18,312 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:18,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:18,312 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:18,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:19,121 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:19,122 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:19,122 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:19,122 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:19,122 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:19,122 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:19,122 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:19,137 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:19,137 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:29:19,200 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:29:19,200 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:19,202 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:19,473 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 255 proven. 40 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-24 12:29:19,473 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:19,724 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 255 proven. 40 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-24 12:29:19,744 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:19,744 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 8, 8] total 35 [2018-10-24 12:29:19,744 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:19,745 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:29:19,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:29:19,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=871, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:29:19,745 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand 29 states. [2018-10-24 12:29:25,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:25,226 INFO L93 Difference]: Finished difference Result 104 states and 119 transitions. [2018-10-24 12:29:25,226 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:29:25,226 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 71 [2018-10-24 12:29:25,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:25,227 INFO L225 Difference]: With dead ends: 104 [2018-10-24 12:29:25,227 INFO L226 Difference]: Without dead ends: 82 [2018-10-24 12:29:25,228 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 135 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=439, Invalid=1121, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:29:25,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-10-24 12:29:25,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 78. [2018-10-24 12:29:25,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-24 12:29:25,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 84 transitions. [2018-10-24 12:29:25,235 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 84 transitions. Word has length 71 [2018-10-24 12:29:25,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:25,236 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 84 transitions. [2018-10-24 12:29:25,236 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:29:25,236 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 84 transitions. [2018-10-24 12:29:25,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-24 12:29:25,239 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:25,240 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 16, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:25,240 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:25,240 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:25,240 INFO L82 PathProgramCache]: Analyzing trace with hash 2099613118, now seen corresponding path program 15 times [2018-10-24 12:29:25,240 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:25,241 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:25,241 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:25,241 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:25,241 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:25,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:25,779 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 44 proven. 693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:25,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:25,780 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:25,780 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:25,780 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:25,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:25,780 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:25,788 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:25,788 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:25,810 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:25,810 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:25,812 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:26,010 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 160 proven. 570 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-24 12:29:26,011 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:29,146 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 160 proven. 570 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-24 12:29:29,166 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:29,166 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 22, 23] total 46 [2018-10-24 12:29:29,167 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:29,167 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:29:29,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:29:29,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=1475, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:29:29,169 INFO L87 Difference]: Start difference. First operand 78 states and 84 transitions. Second operand 25 states. [2018-10-24 12:29:29,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:29,778 INFO L93 Difference]: Finished difference Result 109 states and 123 transitions. [2018-10-24 12:29:29,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:29:29,778 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 77 [2018-10-24 12:29:29,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:29,779 INFO L225 Difference]: With dead ends: 109 [2018-10-24 12:29:29,779 INFO L226 Difference]: Without dead ends: 84 [2018-10-24 12:29:29,781 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 132 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=595, Invalid=1475, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:29:29,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-24 12:29:29,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2018-10-24 12:29:29,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-24 12:29:29,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 90 transitions. [2018-10-24 12:29:29,787 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 90 transitions. Word has length 77 [2018-10-24 12:29:29,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:29,788 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 90 transitions. [2018-10-24 12:29:29,788 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:29:29,788 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 90 transitions. [2018-10-24 12:29:29,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-24 12:29:29,789 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:29,789 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 18, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:29,789 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:29,789 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:29,789 INFO L82 PathProgramCache]: Analyzing trace with hash -1326089058, now seen corresponding path program 16 times [2018-10-24 12:29:29,789 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:29,790 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:29,790 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:29,790 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:29,790 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:29,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:30,602 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 48 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:30,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:30,602 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:30,602 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:30,602 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:30,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:30,603 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:30,611 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:30,611 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:30,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:30,637 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:30,677 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 323 proven. 513 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:29:30,678 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:33,366 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 323 proven. 513 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:29:33,387 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:33,388 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 21, 22] total 47 [2018-10-24 12:29:33,388 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:33,388 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:29:33,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:29:33,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=1546, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:29:33,389 INFO L87 Difference]: Start difference. First operand 84 states and 90 transitions. Second operand 27 states. [2018-10-24 12:29:34,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:34,055 INFO L93 Difference]: Finished difference Result 115 states and 129 transitions. [2018-10-24 12:29:34,055 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:29:34,056 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 83 [2018-10-24 12:29:34,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:34,057 INFO L225 Difference]: With dead ends: 115 [2018-10-24 12:29:34,057 INFO L226 Difference]: Without dead ends: 90 [2018-10-24 12:29:34,058 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 145 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=616, Invalid=1546, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:29:34,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-24 12:29:34,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2018-10-24 12:29:34,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-24 12:29:34,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 96 transitions. [2018-10-24 12:29:34,066 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 96 transitions. Word has length 83 [2018-10-24 12:29:34,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:34,066 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 96 transitions. [2018-10-24 12:29:34,066 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:29:34,066 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 96 transitions. [2018-10-24 12:29:34,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:29:34,067 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:34,067 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 20, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:34,067 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:34,068 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:34,068 INFO L82 PathProgramCache]: Analyzing trace with hash -502348930, now seen corresponding path program 17 times [2018-10-24 12:29:34,068 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:34,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:34,069 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:34,069 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:34,069 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:34,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:34,892 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 52 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:34,892 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:34,892 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:34,892 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:34,893 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:34,893 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:34,893 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:34,900 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:34,900 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:29:34,962 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-24 12:29:34,963 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:34,964 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:35,319 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 400 proven. 57 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2018-10-24 12:29:35,320 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:35,878 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 400 proven. 57 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2018-10-24 12:29:35,909 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:35,909 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 9, 9] total 43 [2018-10-24 12:29:35,909 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:35,910 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:29:35,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:29:35,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=480, Invalid=1326, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:29:35,911 INFO L87 Difference]: Start difference. First operand 90 states and 96 transitions. Second operand 36 states. [2018-10-24 12:29:44,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:44,109 INFO L93 Difference]: Finished difference Result 128 states and 146 transitions. [2018-10-24 12:29:44,109 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:29:44,110 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 89 [2018-10-24 12:29:44,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:44,111 INFO L225 Difference]: With dead ends: 128 [2018-10-24 12:29:44,111 INFO L226 Difference]: Without dead ends: 103 [2018-10-24 12:29:44,112 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 170 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=690, Invalid=1760, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:29:44,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-24 12:29:44,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 99. [2018-10-24 12:29:44,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-24 12:29:44,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 106 transitions. [2018-10-24 12:29:44,119 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 106 transitions. Word has length 89 [2018-10-24 12:29:44,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:44,120 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 106 transitions. [2018-10-24 12:29:44,120 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:29:44,120 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 106 transitions. [2018-10-24 12:29:44,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-10-24 12:29:44,121 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:44,121 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 22, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:44,121 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:44,121 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:44,121 INFO L82 PathProgramCache]: Analyzing trace with hash -2002812611, now seen corresponding path program 18 times [2018-10-24 12:29:44,122 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:44,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:44,122 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:44,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:44,123 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:44,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:45,381 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 140 proven. 1134 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:29:45,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:45,382 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:45,382 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:45,382 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:45,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:45,382 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:45,390 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:45,391 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:45,417 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:45,417 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:45,419 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:45,495 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 460 proven. 759 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-24 12:29:45,495 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:48,043 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 460 proven. 759 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-24 12:29:48,063 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:48,063 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 25, 26] total 55 [2018-10-24 12:29:48,063 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:48,064 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:29:48,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:29:48,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=832, Invalid=2138, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:29:48,065 INFO L87 Difference]: Start difference. First operand 99 states and 106 transitions. Second operand 31 states. [2018-10-24 12:29:49,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:49,124 INFO L93 Difference]: Finished difference Result 133 states and 149 transitions. [2018-10-24 12:29:49,126 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:29:49,126 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 98 [2018-10-24 12:29:49,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:49,128 INFO L225 Difference]: With dead ends: 133 [2018-10-24 12:29:49,128 INFO L226 Difference]: Without dead ends: 105 [2018-10-24 12:29:49,130 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 171 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=832, Invalid=2138, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:29:49,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-24 12:29:49,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2018-10-24 12:29:49,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-10-24 12:29:49,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 112 transitions. [2018-10-24 12:29:49,139 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 112 transitions. Word has length 98 [2018-10-24 12:29:49,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:49,140 INFO L481 AbstractCegarLoop]: Abstraction has 105 states and 112 transitions. [2018-10-24 12:29:49,140 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:29:49,140 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 112 transitions. [2018-10-24 12:29:49,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-24 12:29:49,140 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:49,141 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 24, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:49,141 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:49,141 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:49,141 INFO L82 PathProgramCache]: Analyzing trace with hash 615751261, now seen corresponding path program 19 times [2018-10-24 12:29:49,141 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:49,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:49,142 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:49,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:49,142 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:49,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:50,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 150 proven. 1305 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:29:50,270 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:50,271 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:50,271 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:50,271 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:50,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:50,271 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:50,281 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:50,281 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:50,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:50,312 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:50,408 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 500 proven. 900 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-24 12:29:50,408 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:53,941 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 500 proven. 900 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-24 12:29:53,961 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:53,962 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 27, 28] total 59 [2018-10-24 12:29:53,962 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:53,962 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:29:53,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:29:53,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=952, Invalid=2470, Unknown=0, NotChecked=0, Total=3422 [2018-10-24 12:29:53,964 INFO L87 Difference]: Start difference. First operand 105 states and 112 transitions. Second operand 33 states. [2018-10-24 12:29:54,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:54,997 INFO L93 Difference]: Finished difference Result 139 states and 155 transitions. [2018-10-24 12:29:54,997 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:29:54,998 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 104 [2018-10-24 12:29:54,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:54,998 INFO L225 Difference]: With dead ends: 139 [2018-10-24 12:29:54,999 INFO L226 Difference]: Without dead ends: 111 [2018-10-24 12:29:55,000 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 181 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=952, Invalid=2470, Unknown=0, NotChecked=0, Total=3422 [2018-10-24 12:29:55,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-10-24 12:29:55,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2018-10-24 12:29:55,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-10-24 12:29:55,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 118 transitions. [2018-10-24 12:29:55,010 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 118 transitions. Word has length 104 [2018-10-24 12:29:55,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:55,010 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 118 transitions. [2018-10-24 12:29:55,010 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:29:55,010 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 118 transitions. [2018-10-24 12:29:55,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-10-24 12:29:55,011 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:55,011 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 26, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:55,011 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:55,012 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:55,012 INFO L82 PathProgramCache]: Analyzing trace with hash 323314557, now seen corresponding path program 20 times [2018-10-24 12:29:55,012 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:55,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:55,013 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:55,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:55,013 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:55,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:56,532 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 160 proven. 1488 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:29:56,532 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:56,532 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:56,532 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:56,532 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:56,532 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:56,532 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:56,540 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:56,540 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:30:22,907 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:30:22,907 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:30:24,042 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:24,747 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 598 proven. 77 refuted. 0 times theorem prover too weak. 975 trivial. 0 not checked. [2018-10-24 12:30:24,747 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:25,251 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 598 proven. 77 refuted. 0 times theorem prover too weak. 975 trivial. 0 not checked. [2018-10-24 12:30:25,254 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:25,255 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 10, 10] total 51 [2018-10-24 12:30:25,255 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:25,255 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-24 12:30:25,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-24 12:30:25,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=651, Invalid=1899, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:30:25,257 INFO L87 Difference]: Start difference. First operand 111 states and 118 transitions. Second operand 43 states. [2018-10-24 12:30:39,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:39,921 INFO L93 Difference]: Finished difference Result 155 states and 176 transitions. [2018-10-24 12:30:39,921 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-24 12:30:39,922 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 110 [2018-10-24 12:30:39,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:39,923 INFO L225 Difference]: With dead ends: 155 [2018-10-24 12:30:39,923 INFO L226 Difference]: Without dead ends: 127 [2018-10-24 12:30:39,924 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 211 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=977, Invalid=2563, Unknown=0, NotChecked=0, Total=3540 [2018-10-24 12:30:39,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-24 12:30:39,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 120. [2018-10-24 12:30:39,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-10-24 12:30:39,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 128 transitions. [2018-10-24 12:30:39,935 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 128 transitions. Word has length 110 [2018-10-24 12:30:39,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:39,935 INFO L481 AbstractCegarLoop]: Abstraction has 120 states and 128 transitions. [2018-10-24 12:30:39,935 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-24 12:30:39,936 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 128 transitions. [2018-10-24 12:30:39,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:30:39,936 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:39,936 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 28, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:39,936 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:39,936 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:39,937 INFO L82 PathProgramCache]: Analyzing trace with hash -1376389474, now seen corresponding path program 21 times [2018-10-24 12:30:39,937 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:39,937 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:39,937 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:30:39,937 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:39,938 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:39,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:41,522 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:41,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:41,523 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:41,523 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:41,523 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:41,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:41,523 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:41,531 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:30:41,531 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:30:41,568 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:30:41,568 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:30:41,571 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:41,674 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 667 proven. 1218 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:30:41,674 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:46,351 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 667 proven. 1218 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:30:46,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:46,371 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 31, 32] total 69 [2018-10-24 12:30:46,371 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:46,371 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:30:46,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:30:46,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1246, Invalid=3446, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:30:46,373 INFO L87 Difference]: Start difference. First operand 120 states and 128 transitions. Second operand 39 states. [2018-10-24 12:30:47,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:47,861 INFO L93 Difference]: Finished difference Result 154 states and 171 transitions. [2018-10-24 12:30:47,861 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:30:47,862 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 119 [2018-10-24 12:30:47,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:47,863 INFO L225 Difference]: With dead ends: 154 [2018-10-24 12:30:47,863 INFO L226 Difference]: Without dead ends: 123 [2018-10-24 12:30:47,864 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 207 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=1246, Invalid=3446, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:30:47,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-24 12:30:47,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2018-10-24 12:30:47,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-10-24 12:30:47,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 131 transitions. [2018-10-24 12:30:47,873 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 131 transitions. Word has length 119 [2018-10-24 12:30:47,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:47,873 INFO L481 AbstractCegarLoop]: Abstraction has 123 states and 131 transitions. [2018-10-24 12:30:47,874 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:30:47,874 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 131 transitions. [2018-10-24 12:30:47,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-10-24 12:30:47,874 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:47,875 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 29, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:47,875 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:47,875 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:47,875 INFO L82 PathProgramCache]: Analyzing trace with hash -57936773, now seen corresponding path program 22 times [2018-10-24 12:30:47,875 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:47,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:47,876 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:30:47,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:47,876 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:47,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:48,780 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:48,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:48,780 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:48,781 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:48,781 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:48,781 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:48,781 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:48,789 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:30:48,789 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:30:48,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:48,824 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:48,894 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 690 proven. 1305 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:30:48,894 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:53,350 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 690 proven. 1305 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:30:53,370 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:53,371 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 32, 33] total 71 [2018-10-24 12:30:53,371 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:53,371 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-24 12:30:53,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-24 12:30:53,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1318, Invalid=3652, Unknown=0, NotChecked=0, Total=4970 [2018-10-24 12:30:53,373 INFO L87 Difference]: Start difference. First operand 123 states and 131 transitions. Second operand 40 states. [2018-10-24 12:30:55,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:55,083 INFO L93 Difference]: Finished difference Result 157 states and 174 transitions. [2018-10-24 12:30:55,084 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:30:55,084 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 122 [2018-10-24 12:30:55,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:55,085 INFO L225 Difference]: With dead ends: 157 [2018-10-24 12:30:55,085 INFO L226 Difference]: Without dead ends: 126 [2018-10-24 12:30:55,088 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 212 SyntacticMatches, 3 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=1318, Invalid=3652, Unknown=0, NotChecked=0, Total=4970 [2018-10-24 12:30:55,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-10-24 12:30:55,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2018-10-24 12:30:55,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-10-24 12:30:55,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 134 transitions. [2018-10-24 12:30:55,099 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 134 transitions. Word has length 122 [2018-10-24 12:30:55,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:55,099 INFO L481 AbstractCegarLoop]: Abstraction has 126 states and 134 transitions. [2018-10-24 12:30:55,099 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-24 12:30:55,099 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 134 transitions. [2018-10-24 12:30:55,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-24 12:30:55,100 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:55,100 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 30, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:55,100 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:55,101 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:55,101 INFO L82 PathProgramCache]: Analyzing trace with hash 490556798, now seen corresponding path program 23 times [2018-10-24 12:30:55,101 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:55,101 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:55,102 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:30:55,102 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:55,102 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:55,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:56,072 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:56,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:56,073 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:56,073 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:56,073 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:56,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:56,073 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:56,080 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:30:56,080 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:32:24,282 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-24 12:32:24,282 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:32:24,330 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:32:25,217 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 841 proven. 126 refuted. 0 times theorem prover too weak. 1218 trivial. 0 not checked. [2018-10-24 12:32:25,217 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:32:26,754 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 841 proven. 126 refuted. 0 times theorem prover too weak. 1218 trivial. 0 not checked. [2018-10-24 12:32:26,775 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:32:26,775 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 12, 13] total 62 [2018-10-24 12:32:26,775 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:32:26,775 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-24 12:32:26,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-24 12:32:26,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=939, Invalid=2843, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:32:26,777 INFO L87 Difference]: Start difference. First operand 126 states and 134 transitions. Second operand 51 states. [2018-10-24 12:32:30,164 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 12 [2018-10-24 12:32:32,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:32:32,841 INFO L93 Difference]: Finished difference Result 170 states and 192 transitions. [2018-10-24 12:32:32,841 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-24 12:32:32,841 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 125 [2018-10-24 12:32:32,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:32:32,842 INFO L225 Difference]: With dead ends: 170 [2018-10-24 12:32:32,842 INFO L226 Difference]: Without dead ends: 139 [2018-10-24 12:32:32,843 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 236 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=1184, Invalid=3786, Unknown=0, NotChecked=0, Total=4970 [2018-10-24 12:32:32,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-24 12:32:32,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 133. [2018-10-24 12:32:32,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-10-24 12:32:32,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2018-10-24 12:32:32,856 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 125 [2018-10-24 12:32:32,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:32:32,856 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2018-10-24 12:32:32,856 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-24 12:32:32,856 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2018-10-24 12:32:32,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-10-24 12:32:32,857 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:32:32,857 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:32:32,858 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:32:32,858 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:32:32,858 INFO L82 PathProgramCache]: Analyzing trace with hash -2039378720, now seen corresponding path program 24 times [2018-10-24 12:32:32,858 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:32:32,859 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:32,859 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:32:32,859 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:32,859 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:32:32,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:34,192 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:34,192 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:34,192 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:32:34,193 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:32:34,193 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:32:34,193 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:34,193 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:32:34,200 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:32:34,200 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:32:34,236 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:32:34,236 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:32:34,239 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:32:34,317 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 832 proven. 1488 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-24 12:32:34,317 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:32:39,242 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 832 proven. 1488 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-24 12:32:39,262 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:32:39,262 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 34, 35] total 76 [2018-10-24 12:32:39,262 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:32:39,263 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-24 12:32:39,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-24 12:32:39,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1503, Invalid=4197, Unknown=0, NotChecked=0, Total=5700 [2018-10-24 12:32:39,264 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand 43 states. [2018-10-24 12:32:41,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:32:41,058 INFO L93 Difference]: Finished difference Result 171 states and 176 transitions. [2018-10-24 12:32:41,059 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:32:41,059 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 131 [2018-10-24 12:32:41,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:32:41,060 INFO L225 Difference]: With dead ends: 171 [2018-10-24 12:32:41,060 INFO L226 Difference]: Without dead ends: 136 [2018-10-24 12:32:41,060 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 228 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=1503, Invalid=4197, Unknown=0, NotChecked=0, Total=5700 [2018-10-24 12:32:41,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-10-24 12:32:41,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2018-10-24 12:32:41,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-10-24 12:32:41,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 138 transitions. [2018-10-24 12:32:41,075 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 138 transitions. Word has length 131 [2018-10-24 12:32:41,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:32:41,076 INFO L481 AbstractCegarLoop]: Abstraction has 136 states and 138 transitions. [2018-10-24 12:32:41,076 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-24 12:32:41,076 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 138 transitions. [2018-10-24 12:32:41,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-24 12:32:41,076 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:32:41,077 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 32, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:32:41,077 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:32:41,077 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:32:41,077 INFO L82 PathProgramCache]: Analyzing trace with hash 34645821, now seen corresponding path program 25 times [2018-10-24 12:32:41,077 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:32:41,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:41,078 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:32:41,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:41,078 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:32:41,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:43,076 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:43,076 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:43,076 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:32:43,077 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:32:43,077 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:32:43,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:43,077 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:32:43,097 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:32:43,097 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:32:43,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:43,135 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:32:43,274 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 858 proven. 1584 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-24 12:32:43,274 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:32:48,817 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 858 proven. 1584 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-24 12:32:48,837 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:32:48,837 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 35, 36] total 78 [2018-10-24 12:32:48,837 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:32:48,837 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-24 12:32:48,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-24 12:32:48,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1582, Invalid=4424, Unknown=0, NotChecked=0, Total=6006 [2018-10-24 12:32:48,838 INFO L87 Difference]: Start difference. First operand 136 states and 138 transitions. Second operand 44 states. [2018-10-24 12:32:50,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:32:50,794 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2018-10-24 12:32:50,794 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:32:50,794 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 134 [2018-10-24 12:32:50,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:32:50,795 INFO L225 Difference]: With dead ends: 174 [2018-10-24 12:32:50,796 INFO L226 Difference]: Without dead ends: 139 [2018-10-24 12:32:50,797 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 233 SyntacticMatches, 3 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=1582, Invalid=4424, Unknown=0, NotChecked=0, Total=6006 [2018-10-24 12:32:50,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-24 12:32:50,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2018-10-24 12:32:50,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-10-24 12:32:50,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 141 transitions. [2018-10-24 12:32:50,808 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 141 transitions. Word has length 134 [2018-10-24 12:32:50,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:32:50,808 INFO L481 AbstractCegarLoop]: Abstraction has 139 states and 141 transitions. [2018-10-24 12:32:50,809 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-24 12:32:50,809 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 141 transitions. [2018-10-24 12:32:50,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-10-24 12:32:50,809 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:32:50,810 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 33, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:32:50,810 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:32:50,810 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:32:50,810 INFO L82 PathProgramCache]: Analyzing trace with hash -99773504, now seen corresponding path program 26 times [2018-10-24 12:32:50,810 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:32:50,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:50,811 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:32:50,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:50,811 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:32:50,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:52,018 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:52,019 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:52,019 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:32:52,019 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:32:52,019 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:32:52,019 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:52,019 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:32:52,029 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:32:52,029 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown