java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/diamond_true-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:11:35,092 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:11:35,094 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:11:35,117 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:11:35,118 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:11:35,121 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:11:35,123 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:11:35,125 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:11:35,128 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:11:35,128 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:11:35,129 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:11:35,130 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:11:35,131 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:11:35,132 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:11:35,133 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:11:35,134 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:11:35,134 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:11:35,136 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:11:35,138 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:11:35,140 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:11:35,141 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:11:35,142 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:11:35,145 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:11:35,145 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:11:35,145 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:11:35,146 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:11:35,147 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:11:35,151 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:11:35,152 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:11:35,153 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:11:35,157 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:11:35,158 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-24 12:11:35,158 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-24 12:11:35,158 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-24 12:11:35,159 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-24 12:11:35,160 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-24 12:11:35,160 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-24 12:11:35,187 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:11:35,187 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:11:35,190 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:11:35,191 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:11:35,191 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:11:35,191 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:11:35,191 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:11:35,191 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:11:35,192 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:11:35,192 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:11:35,192 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:11:35,192 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:11:35,193 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:11:35,193 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:11:35,193 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:11:35,193 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:11:35,193 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:11:35,195 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:11:35,195 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:11:35,196 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:11:35,196 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:11:35,196 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:11:35,196 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:11:35,196 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:11:35,197 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:11:35,197 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:11:35,197 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:11:35,197 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:11:35,198 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:11:35,198 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:11:35,198 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:11:35,198 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:11:35,198 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:11:35,199 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:11:35,246 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:11:35,258 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:11:35,262 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:11:35,264 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:11:35,264 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:11:35,265 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/diamond_true-unreach-call1_true-termination.i [2018-10-24 12:11:35,319 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/9f035ac4f/5c907717d5884e6eb6537109ede4cfbd/FLAG0a5a6716d [2018-10-24 12:11:35,778 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:11:35,779 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/diamond_true-unreach-call1_true-termination.i [2018-10-24 12:11:35,788 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/9f035ac4f/5c907717d5884e6eb6537109ede4cfbd/FLAG0a5a6716d [2018-10-24 12:11:35,811 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/9f035ac4f/5c907717d5884e6eb6537109ede4cfbd [2018-10-24 12:11:35,824 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:11:35,826 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:11:35,827 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:11:35,827 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:11:35,832 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:11:35,833 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:11:35" (1/1) ... [2018-10-24 12:11:35,836 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ed858fb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:11:35, skipping insertion in model container [2018-10-24 12:11:35,836 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:11:35" (1/1) ... [2018-10-24 12:11:35,847 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:11:35,874 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:11:36,040 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:11:36,044 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:11:36,062 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:11:36,078 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:11:36,078 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:11:36 WrapperNode [2018-10-24 12:11:36,078 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:11:36,079 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:11:36,080 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:11:36,080 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:11:36,089 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:11:36" (1/1) ... [2018-10-24 12:11:36,095 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:11:36" (1/1) ... [2018-10-24 12:11:36,101 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:11:36,102 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:11:36,102 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:11:36,102 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:11:36,112 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:11:36" (1/1) ... [2018-10-24 12:11:36,113 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:11:36" (1/1) ... [2018-10-24 12:11:36,114 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:11:36" (1/1) ... [2018-10-24 12:11:36,114 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:11:36" (1/1) ... [2018-10-24 12:11:36,117 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:11:36" (1/1) ... [2018-10-24 12:11:36,123 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:11:36" (1/1) ... [2018-10-24 12:11:36,124 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:11:36" (1/1) ... [2018-10-24 12:11:36,125 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:11:36,126 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:11:36,126 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:11:36,126 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:11:36,127 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:11:36" (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 12:11:36,263 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:11:36,264 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:11:36,264 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:11:36,264 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:11:36,264 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:11:36,264 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:11:36,265 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:11:36,265 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:11:36,475 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:11:36,476 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:11:36 BoogieIcfgContainer [2018-10-24 12:11:36,476 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:11:36,477 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:11:36,477 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:11:36,483 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:11:36,484 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:11:35" (1/3) ... [2018-10-24 12:11:36,485 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79a6bfae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:11:36, skipping insertion in model container [2018-10-24 12:11:36,485 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:11:36" (2/3) ... [2018-10-24 12:11:36,486 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79a6bfae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:11:36, skipping insertion in model container [2018-10-24 12:11:36,486 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:11:36" (3/3) ... [2018-10-24 12:11:36,488 INFO L112 eAbstractionObserver]: Analyzing ICFG diamond_true-unreach-call1_true-termination.i [2018-10-24 12:11:36,499 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:11:36,506 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:11:36,524 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:11:36,561 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:11:36,561 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:11:36,561 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:11:36,562 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:11:36,562 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:11:36,562 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:11:36,562 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:11:36,562 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:11:36,585 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-10-24 12:11:36,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-24 12:11:36,597 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:36,598 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:36,601 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:36,607 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:36,607 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-10-24 12:11:36,609 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:36,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:36,654 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:36,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:36,655 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:36,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:36,709 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 12:11:36,711 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:11:36,711 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:11:36,711 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:11:36,715 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:11:36,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:11:36,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:11:36,733 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-10-24 12:11:36,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:36,756 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-24 12:11:36,756 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:11:36,757 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-24 12:11:36,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:36,766 INFO L225 Difference]: With dead ends: 30 [2018-10-24 12:11:36,766 INFO L226 Difference]: Without dead ends: 13 [2018-10-24 12:11:36,770 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 12:11:36,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-24 12:11:36,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-24 12:11:36,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-24 12:11:36,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-10-24 12:11:36,810 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-10-24 12:11:36,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:36,811 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-10-24 12:11:36,811 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:11:36,811 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-10-24 12:11:36,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-24 12:11:36,812 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:36,812 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:36,812 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:36,813 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:36,813 INFO L82 PathProgramCache]: Analyzing trace with hash 1144102878, now seen corresponding path program 1 times [2018-10-24 12:11:36,813 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:36,814 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:36,815 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:36,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:36,815 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:36,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:37,060 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2018-10-24 12:11:37,077 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 12:11:37,077 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:11:37,077 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:11:37,078 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:11:37,080 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:11:37,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:11:37,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:11:37,081 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-10-24 12:11:37,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:37,184 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2018-10-24 12:11:37,185 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:11:37,185 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-24 12:11:37,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:37,188 INFO L225 Difference]: With dead ends: 21 [2018-10-24 12:11:37,188 INFO L226 Difference]: Without dead ends: 16 [2018-10-24 12:11:37,189 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 12:11:37,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-24 12:11:37,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-10-24 12:11:37,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-24 12:11:37,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-10-24 12:11:37,199 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2018-10-24 12:11:37,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:37,199 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-10-24 12:11:37,199 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:11:37,200 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-10-24 12:11:37,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-24 12:11:37,200 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:37,201 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:37,201 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:37,201 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:37,201 INFO L82 PathProgramCache]: Analyzing trace with hash -2056921797, now seen corresponding path program 1 times [2018-10-24 12:11:37,202 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:37,203 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:37,204 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:37,204 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:37,204 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:37,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:37,343 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 12:11:37,343 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:37,344 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:37,345 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-24 12:11:37,347 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [26], [29], [31], [37], [38], [39], [41] [2018-10-24 12:11:37,397 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:11:37,398 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:11:37,510 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:11:38,003 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:11:38,005 INFO L272 AbstractInterpreter]: Visited 13 different actions 77 times. Merged at 4 different actions 34 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-24 12:11:38,050 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:38,052 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:11:38,052 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:38,052 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 12:11:38,063 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:38,064 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:11:38,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:38,098 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:38,130 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 12:11:38,131 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:38,236 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 12:11:38,257 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:38,258 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-24 12:11:38,258 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:38,259 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 12:11:38,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 12:11:38,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:11:38,260 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 4 states. [2018-10-24 12:11:38,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:38,386 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2018-10-24 12:11:38,387 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:11:38,387 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-24 12:11:38,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:38,388 INFO L225 Difference]: With dead ends: 24 [2018-10-24 12:11:38,389 INFO L226 Difference]: Without dead ends: 19 [2018-10-24 12:11:38,390 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:11:38,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-24 12:11:38,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2018-10-24 12:11:38,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 12:11:38,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2018-10-24 12:11:38,394 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2018-10-24 12:11:38,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:38,395 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2018-10-24 12:11:38,395 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 12:11:38,395 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2018-10-24 12:11:38,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-24 12:11:38,396 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:38,396 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:38,397 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:38,397 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:38,397 INFO L82 PathProgramCache]: Analyzing trace with hash -281914435, now seen corresponding path program 1 times [2018-10-24 12:11:38,397 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:38,398 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:38,398 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:38,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:38,399 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:38,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:38,614 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 12:11:38,614 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:38,614 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:38,614 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-24 12:11:38,615 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-24 12:11:38,616 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:11:38,617 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:11:38,622 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:11:38,871 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:11:38,871 INFO L272 AbstractInterpreter]: Visited 13 different actions 77 times. Merged at 4 different actions 34 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 4 variables. [2018-10-24 12:11:38,909 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:38,909 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:11:38,910 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:38,910 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 12:11:38,928 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:38,928 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:11:38,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:38,956 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:39,031 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 12:11:39,032 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:39,314 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 12:11:39,343 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:39,343 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-24 12:11:39,343 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:39,344 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 12:11:39,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 12:11:39,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:11:39,345 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 4 states. [2018-10-24 12:11:39,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:39,617 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2018-10-24 12:11:39,617 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:11:39,618 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-24 12:11:39,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:39,618 INFO L225 Difference]: With dead ends: 26 [2018-10-24 12:11:39,619 INFO L226 Difference]: Without dead ends: 21 [2018-10-24 12:11:39,619 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:11:39,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-24 12:11:39,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2018-10-24 12:11:39,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 12:11:39,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2018-10-24 12:11:39,624 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2018-10-24 12:11:39,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:39,624 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2018-10-24 12:11:39,625 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 12:11:39,625 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2018-10-24 12:11:39,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 12:11:39,625 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:39,626 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:39,626 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:39,626 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:39,626 INFO L82 PathProgramCache]: Analyzing trace with hash 1670825662, now seen corresponding path program 2 times [2018-10-24 12:11:39,626 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:39,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:39,628 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:39,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:39,628 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:39,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:40,004 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 12:11:40,005 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:40,005 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:40,005 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:40,006 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:40,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:40,006 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 12:11:40,021 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:40,022 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:11:40,054 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:11:40,054 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:40,056 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:40,094 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 12:11:40,094 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:40,172 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 12:11:40,199 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:40,200 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-24 12:11:40,200 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:40,200 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:11:40,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:11:40,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:11:40,201 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2018-10-24 12:11:40,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:40,385 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2018-10-24 12:11:40,385 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:11:40,386 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-10-24 12:11:40,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:40,387 INFO L225 Difference]: With dead ends: 29 [2018-10-24 12:11:40,387 INFO L226 Difference]: Without dead ends: 24 [2018-10-24 12:11:40,388 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:11:40,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-24 12:11:40,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2018-10-24 12:11:40,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-24 12:11:40,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2018-10-24 12:11:40,392 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 17 [2018-10-24 12:11:40,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:40,393 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2018-10-24 12:11:40,393 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:11:40,393 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2018-10-24 12:11:40,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 12:11:40,394 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:40,394 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:40,394 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:40,395 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:40,395 INFO L82 PathProgramCache]: Analyzing trace with hash -849134272, now seen corresponding path program 1 times [2018-10-24 12:11:40,395 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:40,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:40,396 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:40,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:40,396 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:40,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:40,567 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 12:11:40,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:40,568 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:40,568 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 18 with the following transitions: [2018-10-24 12:11:40,569 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-24 12:11:40,570 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:11:40,571 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:11:40,575 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:11:40,765 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:11:40,765 INFO L272 AbstractInterpreter]: Visited 14 different actions 87 times. Merged at 5 different actions 34 times. Widened at 1 different actions 5 times. Found 11 fixpoints after 2 different actions. Largest state had 4 variables. [2018-10-24 12:11:40,804 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:40,804 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:11:40,805 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:40,805 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 12:11:40,820 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:40,820 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:11:40,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:40,853 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:41,041 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:41,041 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:41,069 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:41,090 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-24 12:11:41,090 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 6 [2018-10-24 12:11:41,090 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:11:41,090 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:11:41,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:11:41,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:11:41,091 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand 3 states. [2018-10-24 12:11:41,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:41,112 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2018-10-24 12:11:41,114 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:11:41,114 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-10-24 12:11:41,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:41,115 INFO L225 Difference]: With dead ends: 35 [2018-10-24 12:11:41,116 INFO L226 Difference]: Without dead ends: 27 [2018-10-24 12:11:41,117 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:11:41,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-24 12:11:41,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-24 12:11:41,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-24 12:11:41,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2018-10-24 12:11:41,124 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 17 [2018-10-24 12:11:41,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:41,124 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2018-10-24 12:11:41,124 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:11:41,125 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2018-10-24 12:11:41,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 12:11:41,125 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:41,126 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:41,126 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:41,126 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:41,126 INFO L82 PathProgramCache]: Analyzing trace with hash 1277798652, now seen corresponding path program 2 times [2018-10-24 12:11:41,126 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:41,127 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:41,128 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:41,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:41,128 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:41,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:41,394 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 12:11:41,394 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:41,395 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:41,395 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:41,395 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:41,395 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:41,395 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 12:11:41,406 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:41,407 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:11:41,433 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:11:41,434 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:41,436 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:41,709 WARN L179 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 6 [2018-10-24 12:11:41,725 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:41,725 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:41,791 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:41,812 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-24 12:11:41,812 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 6 [2018-10-24 12:11:41,812 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:11:41,813 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:11:41,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:11:41,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:11:41,813 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 3 states. [2018-10-24 12:11:41,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:41,833 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2018-10-24 12:11:41,834 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:11:41,834 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-10-24 12:11:41,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:41,835 INFO L225 Difference]: With dead ends: 35 [2018-10-24 12:11:41,835 INFO L226 Difference]: Without dead ends: 27 [2018-10-24 12:11:41,836 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:11:41,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-24 12:11:41,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-24 12:11:41,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-24 12:11:41,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2018-10-24 12:11:41,844 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 17 [2018-10-24 12:11:41,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:41,845 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2018-10-24 12:11:41,845 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:11:41,845 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2018-10-24 12:11:41,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 12:11:41,846 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:41,846 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:41,846 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:41,846 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:41,847 INFO L82 PathProgramCache]: Analyzing trace with hash -1242161282, now seen corresponding path program 2 times [2018-10-24 12:11:41,849 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:41,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:41,850 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:41,850 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:41,850 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:41,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:41,994 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 12:11:41,994 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:41,994 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:41,995 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:41,995 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:41,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:41,995 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 12:11:42,004 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:42,004 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:11:54,034 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:11:54,035 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:54,037 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:54,098 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 12:11:54,098 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:54,181 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 12:11:54,205 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:54,205 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-24 12:11:54,206 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:54,206 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:11:54,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:11:54,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:11:54,207 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 5 states. [2018-10-24 12:11:54,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:54,257 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2018-10-24 12:11:54,257 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:11:54,257 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-10-24 12:11:54,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:54,258 INFO L225 Difference]: With dead ends: 35 [2018-10-24 12:11:54,258 INFO L226 Difference]: Without dead ends: 30 [2018-10-24 12:11:54,258 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:11:54,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-24 12:11:54,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-10-24 12:11:54,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-24 12:11:54,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2018-10-24 12:11:54,264 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 17 [2018-10-24 12:11:54,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:54,265 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2018-10-24 12:11:54,265 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:11:54,265 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2018-10-24 12:11:54,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-24 12:11:54,266 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:54,266 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:54,266 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:54,267 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:54,267 INFO L82 PathProgramCache]: Analyzing trace with hash 26004059, now seen corresponding path program 3 times [2018-10-24 12:11:54,267 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:54,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:54,268 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:54,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:54,268 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:54,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:54,446 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:54,447 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:54,447 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:54,447 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:54,447 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:54,447 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:54,448 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 12:11:54,463 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:11:54,463 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:11:54,472 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:11:54,472 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:54,475 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:54,484 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:54,484 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:54,615 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:54,636 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:54,636 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-24 12:11:54,637 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:54,637 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:11:54,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:11:54,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:11:54,638 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 6 states. [2018-10-24 12:11:54,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:54,729 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2018-10-24 12:11:54,732 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:11:54,732 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-24 12:11:54,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:54,733 INFO L225 Difference]: With dead ends: 38 [2018-10-24 12:11:54,734 INFO L226 Difference]: Without dead ends: 33 [2018-10-24 12:11:54,734 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:11:54,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-24 12:11:54,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-10-24 12:11:54,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-24 12:11:54,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2018-10-24 12:11:54,740 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 20 [2018-10-24 12:11:54,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:54,740 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2018-10-24 12:11:54,741 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:11:54,741 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2018-10-24 12:11:54,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-24 12:11:54,742 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:54,742 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:54,742 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:54,742 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:54,742 INFO L82 PathProgramCache]: Analyzing trace with hash 821178397, now seen corresponding path program 3 times [2018-10-24 12:11:54,743 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:54,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:54,744 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:54,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:54,744 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:54,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:55,093 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:55,093 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:55,093 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:55,094 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:55,094 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:55,094 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:55,095 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 12:11:55,112 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:11:55,112 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:11:55,136 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:11:55,136 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:55,138 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:55,150 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:55,150 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:55,581 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:55,602 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:55,603 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-24 12:11:55,603 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:55,603 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:11:55,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:11:55,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:11:55,604 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 6 states. [2018-10-24 12:11:55,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:55,685 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2018-10-24 12:11:55,688 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:11:55,688 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-24 12:11:55,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:55,688 INFO L225 Difference]: With dead ends: 41 [2018-10-24 12:11:55,689 INFO L226 Difference]: Without dead ends: 36 [2018-10-24 12:11:55,689 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:11:55,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-24 12:11:55,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2018-10-24 12:11:55,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-24 12:11:55,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2018-10-24 12:11:55,695 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 20 [2018-10-24 12:11:55,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:55,695 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2018-10-24 12:11:55,695 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:11:55,695 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2018-10-24 12:11:55,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-24 12:11:55,696 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:55,696 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:55,697 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:55,697 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:55,697 INFO L82 PathProgramCache]: Analyzing trace with hash 427509150, now seen corresponding path program 4 times [2018-10-24 12:11:55,697 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:55,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:55,698 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:55,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:55,698 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:55,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:56,185 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 12:11:56,185 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:56,185 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:56,186 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:56,186 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:56,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:56,186 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 12:11:56,195 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:56,195 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:11:56,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:56,206 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:56,214 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 12:11:56,214 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:57,035 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 12:11:57,055 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:57,055 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-24 12:11:57,055 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:57,056 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:11:57,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:11:57,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:11:57,057 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 7 states. [2018-10-24 12:11:57,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:57,140 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2018-10-24 12:11:57,141 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:11:57,141 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-10-24 12:11:57,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:57,142 INFO L225 Difference]: With dead ends: 44 [2018-10-24 12:11:57,142 INFO L226 Difference]: Without dead ends: 39 [2018-10-24 12:11:57,143 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:11:57,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-24 12:11:57,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-10-24 12:11:57,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-24 12:11:57,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-10-24 12:11:57,148 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 23 [2018-10-24 12:11:57,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:57,149 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-10-24 12:11:57,149 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:11:57,149 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-10-24 12:11:57,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-24 12:11:57,150 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:57,150 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:57,150 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:57,151 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:57,151 INFO L82 PathProgramCache]: Analyzing trace with hash 201615134, now seen corresponding path program 4 times [2018-10-24 12:11:57,151 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:57,152 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:57,152 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:57,152 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:57,152 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:57,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:57,374 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 12:11:57,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:57,375 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:57,375 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:57,375 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:57,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:57,375 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 12:11:57,386 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:57,386 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:11:57,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:57,397 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:57,409 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 12:11:57,410 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:57,835 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 12:11:57,856 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:57,857 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-24 12:11:57,857 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:57,857 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:11:57,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:11:57,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:11:57,858 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 7 states. [2018-10-24 12:11:58,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:58,016 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2018-10-24 12:11:58,017 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:11:58,018 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-10-24 12:11:58,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:58,018 INFO L225 Difference]: With dead ends: 47 [2018-10-24 12:11:58,018 INFO L226 Difference]: Without dead ends: 42 [2018-10-24 12:11:58,019 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:11:58,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-24 12:11:58,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2018-10-24 12:11:58,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-24 12:11:58,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2018-10-24 12:11:58,023 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 23 [2018-10-24 12:11:58,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:58,024 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2018-10-24 12:11:58,024 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:11:58,024 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2018-10-24 12:11:58,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-24 12:11:58,025 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:58,025 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:58,025 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:58,025 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:58,026 INFO L82 PathProgramCache]: Analyzing trace with hash 181755771, now seen corresponding path program 5 times [2018-10-24 12:11:58,026 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:58,026 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:58,027 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:58,027 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:58,027 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:58,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:58,337 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:58,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:58,337 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:58,337 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:58,337 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:58,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:58,338 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 12:11:58,345 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:58,345 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:11:58,365 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:11:58,365 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:58,367 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:58,430 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:58,430 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:58,763 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:58,784 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:58,784 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-24 12:11:58,784 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:58,784 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:11:58,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:11:58,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:11:58,785 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 8 states. [2018-10-24 12:11:58,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:58,891 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2018-10-24 12:11:58,892 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:11:58,892 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-10-24 12:11:58,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:58,893 INFO L225 Difference]: With dead ends: 50 [2018-10-24 12:11:58,893 INFO L226 Difference]: Without dead ends: 45 [2018-10-24 12:11:58,893 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:11:58,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-24 12:11:58,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2018-10-24 12:11:58,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-24 12:11:58,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2018-10-24 12:11:58,900 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 26 [2018-10-24 12:11:58,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:58,900 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2018-10-24 12:11:58,900 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:11:58,901 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2018-10-24 12:11:58,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-24 12:11:58,902 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:58,902 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:58,902 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:58,902 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:58,903 INFO L82 PathProgramCache]: Analyzing trace with hash -1733081987, now seen corresponding path program 5 times [2018-10-24 12:11:58,903 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:58,903 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:58,904 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:58,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:58,904 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:58,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:59,073 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:59,074 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:59,074 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:59,074 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:59,074 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:59,074 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:59,074 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 12:11:59,083 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:59,083 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:12:23,323 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 12:12:23,323 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:12:23,325 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:24,107 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:12:24,108 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:30,493 WARN L854 $PredicateComparison]: unable to prove that (or (forall ((v_prenex_1 Int)) (let ((.cse0 (mod v_prenex_1 2))) (or (= .cse0 (mod (+ c_main_~x~0 1) 2)) (= .cse0 0) (= 0 (mod (+ .cse0 4294967294) 4294967296))))) (< (mod (+ c_main_~x~0 1) 4294967296) 99) (<= 99 (mod c_main_~x~0 4294967296))) is different from true [2018-10-24 12:12:32,536 WARN L854 $PredicateComparison]: unable to prove that (or (forall ((v_prenex_1 Int)) (let ((.cse0 (mod v_prenex_1 2))) (or (= .cse0 0) (= 0 (mod (+ .cse0 4294967294) 4294967296)) (= .cse0 (mod c_main_~x~0 2))))) (< (mod (+ c_main_~x~0 2) 4294967296) 99) (<= 99 (mod (+ c_main_~x~0 1) 4294967296))) is different from true [2018-10-24 12:12:38,583 WARN L854 $PredicateComparison]: unable to prove that (forall ((main_~x~0 Int) (v_prenex_1 Int)) (let ((.cse0 (mod v_prenex_1 2))) (or (= .cse0 0) (< (mod (+ main_~x~0 2) 4294967296) 99) (<= 99 (mod main_~x~0 4294967296)) (<= 99 (mod (+ main_~x~0 1) 4294967296)) (= 0 (mod (+ .cse0 4294967294) 4294967296)) (= .cse0 (mod main_~x~0 2))))) is different from true [2018-10-24 12:12:38,591 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 5 not checked. [2018-10-24 12:12:38,612 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-10-24 12:12:38,614 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [9] imperfect sequences [8, 10] total 23 [2018-10-24 12:12:38,614 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:12:38,614 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:12:38,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:12:38,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=303, Unknown=5, NotChecked=114, Total=506 [2018-10-24 12:12:38,615 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 9 states. [2018-10-24 12:12:38,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:38,883 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-10-24 12:12:38,883 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:12:38,883 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2018-10-24 12:12:38,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:38,884 INFO L225 Difference]: With dead ends: 49 [2018-10-24 12:12:38,885 INFO L226 Difference]: Without dead ends: 30 [2018-10-24 12:12:38,886 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=98, Invalid=371, Unknown=5, NotChecked=126, Total=600 [2018-10-24 12:12:38,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-24 12:12:38,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-24 12:12:38,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-24 12:12:38,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-24 12:12:38,892 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 26 [2018-10-24 12:12:38,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:38,892 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-24 12:12:38,892 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:12:38,892 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-24 12:12:38,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-24 12:12:38,893 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:38,893 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:38,893 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:38,894 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:38,894 INFO L82 PathProgramCache]: Analyzing trace with hash 1862081662, now seen corresponding path program 6 times [2018-10-24 12:12:38,894 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:38,895 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:38,895 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:12:38,895 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:38,895 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:38,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:39,069 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 12:12:39,069 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:39,069 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:39,069 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:39,070 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:39,070 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:39,070 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 12:12:39,079 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:12:39,079 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:12:39,093 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:12:39,093 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:12:39,095 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:39,111 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 12:12:39,111 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:39,852 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 12:12:39,872 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:39,872 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-24 12:12:39,872 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:39,874 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:12:39,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:12:39,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:12:39,875 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 9 states. [2018-10-24 12:12:40,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:40,032 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-24 12:12:40,032 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:12:40,032 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-10-24 12:12:40,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:40,033 INFO L225 Difference]: With dead ends: 39 [2018-10-24 12:12:40,033 INFO L226 Difference]: Without dead ends: 34 [2018-10-24 12:12:40,034 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:12:40,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-24 12:12:40,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-10-24 12:12:40,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-24 12:12:40,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-24 12:12:40,038 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 29 [2018-10-24 12:12:40,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:40,039 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-24 12:12:40,039 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:12:40,039 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-24 12:12:40,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-24 12:12:40,040 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:40,040 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:40,040 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:40,040 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:40,040 INFO L82 PathProgramCache]: Analyzing trace with hash -1688101733, now seen corresponding path program 7 times [2018-10-24 12:12:40,041 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:40,041 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:40,041 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:12:40,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:40,042 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:40,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:40,214 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 12:12:40,214 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:40,214 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:40,214 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:40,214 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:40,214 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:40,214 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 12:12:40,223 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:12:40,223 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:12:40,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:40,238 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:40,254 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 12:12:40,255 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:41,295 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 12:12:41,317 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:41,318 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-24 12:12:41,318 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:41,318 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:12:41,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:12:41,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:12:41,319 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 10 states. [2018-10-24 12:12:41,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:41,448 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-24 12:12:41,448 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:12:41,448 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-24 12:12:41,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:41,450 INFO L225 Difference]: With dead ends: 42 [2018-10-24 12:12:41,450 INFO L226 Difference]: Without dead ends: 37 [2018-10-24 12:12:41,451 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:12:41,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-24 12:12:41,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2018-10-24 12:12:41,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-24 12:12:41,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-24 12:12:41,456 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 32 [2018-10-24 12:12:41,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:41,457 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-24 12:12:41,457 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:12:41,457 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-24 12:12:41,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-24 12:12:41,458 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:41,458 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:41,458 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:41,458 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:41,459 INFO L82 PathProgramCache]: Analyzing trace with hash -1631958178, now seen corresponding path program 8 times [2018-10-24 12:12:41,459 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:41,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:41,460 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:12:41,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:41,460 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:41,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:41,695 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 12:12:41,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:41,696 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:41,696 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:41,696 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:41,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:41,696 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) [2018-10-24 12:12:41,711 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:12:41,711 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:12:44,809 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:12:44,810 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:12:44,813 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:44,835 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 12:12:44,835 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:46,669 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 12:12:46,689 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:46,689 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-24 12:12:46,689 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:46,690 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:12:46,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:12:46,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:12:46,690 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 11 states. [2018-10-24 12:12:46,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:46,834 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-24 12:12:46,834 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:12:46,835 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-10-24 12:12:46,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:46,836 INFO L225 Difference]: With dead ends: 45 [2018-10-24 12:12:46,836 INFO L226 Difference]: Without dead ends: 40 [2018-10-24 12:12:46,837 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:12:46,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-24 12:12:46,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2018-10-24 12:12:46,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-24 12:12:46,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-10-24 12:12:46,842 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 35 [2018-10-24 12:12:46,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:46,843 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-10-24 12:12:46,843 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:12:46,843 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-10-24 12:12:46,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-24 12:12:46,844 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:46,844 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:46,844 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:46,844 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:46,844 INFO L82 PathProgramCache]: Analyzing trace with hash 198410683, now seen corresponding path program 9 times [2018-10-24 12:12:46,845 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:46,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:46,845 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:12:46,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:46,846 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:46,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:47,110 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:47,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:47,110 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:47,110 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:47,110 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:47,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:47,111 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 12:12:47,118 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:12:47,119 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:12:47,130 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:12:47,130 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:12:47,132 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:47,151 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:47,151 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:49,801 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:49,821 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:49,822 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-24 12:12:49,822 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:49,822 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:12:49,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:12:49,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:12:49,823 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 12 states. [2018-10-24 12:12:50,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:50,136 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-24 12:12:50,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:12:50,136 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-10-24 12:12:50,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:50,137 INFO L225 Difference]: With dead ends: 48 [2018-10-24 12:12:50,137 INFO L226 Difference]: Without dead ends: 43 [2018-10-24 12:12:50,138 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:12:50,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-24 12:12:50,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2018-10-24 12:12:50,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-24 12:12:50,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-24 12:12:50,144 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 38 [2018-10-24 12:12:50,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:50,144 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-24 12:12:50,144 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:12:50,144 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-24 12:12:50,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-24 12:12:50,145 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:50,145 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:50,145 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:50,146 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:50,146 INFO L82 PathProgramCache]: Analyzing trace with hash -187641282, now seen corresponding path program 10 times [2018-10-24 12:12:50,146 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:50,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:50,147 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:12:50,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:50,147 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:50,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:50,488 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 12:12:50,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:50,488 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:50,488 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:50,488 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:50,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:50,488 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 12:12:50,495 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:12:50,496 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:12:50,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:50,524 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:50,570 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 12:12:50,571 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:54,762 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 12:12:54,782 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:54,783 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-24 12:12:54,783 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:54,783 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:12:54,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:12:54,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:12:54,784 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 13 states. [2018-10-24 12:12:55,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:55,048 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-24 12:12:55,050 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:12:55,050 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-10-24 12:12:55,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:55,051 INFO L225 Difference]: With dead ends: 51 [2018-10-24 12:12:55,051 INFO L226 Difference]: Without dead ends: 46 [2018-10-24 12:12:55,052 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:12:55,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-24 12:12:55,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2018-10-24 12:12:55,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-24 12:12:55,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-10-24 12:12:55,056 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 41 [2018-10-24 12:12:55,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:55,056 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-10-24 12:12:55,057 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:12:55,057 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-10-24 12:12:55,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-24 12:12:55,058 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:55,058 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:55,058 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:55,058 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:55,058 INFO L82 PathProgramCache]: Analyzing trace with hash 860688091, now seen corresponding path program 11 times [2018-10-24 12:12:55,058 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:55,059 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:55,059 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:12:55,059 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:55,059 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:55,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:55,803 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 12:12:55,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:55,804 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:55,804 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:55,804 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:55,804 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:55,804 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 12:12:55,812 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:12:55,812 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:13:02,107 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:13:02,107 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:13:02,183 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:02,200 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 12:13:02,200 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:04,807 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 12:13:04,834 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:04,834 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-24 12:13:04,835 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:04,835 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:13:04,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:13:04,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:13:04,836 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 14 states. [2018-10-24 12:13:05,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:05,376 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-24 12:13:05,377 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:13:05,377 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-10-24 12:13:05,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:05,378 INFO L225 Difference]: With dead ends: 54 [2018-10-24 12:13:05,378 INFO L226 Difference]: Without dead ends: 49 [2018-10-24 12:13:05,379 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:13:05,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-24 12:13:05,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2018-10-24 12:13:05,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-24 12:13:05,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-24 12:13:05,384 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 44 [2018-10-24 12:13:05,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:05,384 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-24 12:13:05,385 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:13:05,385 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-24 12:13:05,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-24 12:13:05,386 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:05,386 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:05,386 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:05,387 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:05,387 INFO L82 PathProgramCache]: Analyzing trace with hash -1361137378, now seen corresponding path program 12 times [2018-10-24 12:13:05,387 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:05,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:05,388 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:13:05,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:05,388 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:05,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:05,884 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 12:13:05,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:05,885 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:05,885 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:05,885 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:05,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:05,886 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 12:13:05,895 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:13:05,895 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:13:05,929 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:13:05,929 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:13:05,931 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:05,952 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 12:13:05,953 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:12,337 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 12:13:12,358 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:12,358 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-24 12:13:12,358 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:12,358 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:13:12,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:13:12,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:13:12,359 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 15 states. [2018-10-24 12:13:12,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:12,653 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-24 12:13:12,654 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:13:12,654 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-10-24 12:13:12,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:12,655 INFO L225 Difference]: With dead ends: 57 [2018-10-24 12:13:12,655 INFO L226 Difference]: Without dead ends: 52 [2018-10-24 12:13:12,656 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:13:12,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-24 12:13:12,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2018-10-24 12:13:12,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-24 12:13:12,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-10-24 12:13:12,661 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 47 [2018-10-24 12:13:12,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:12,661 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-10-24 12:13:12,662 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:13:12,662 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-10-24 12:13:12,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-24 12:13:12,662 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:12,663 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:12,663 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:12,663 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:12,663 INFO L82 PathProgramCache]: Analyzing trace with hash -2022685701, now seen corresponding path program 13 times [2018-10-24 12:13:12,663 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:12,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:12,664 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:13:12,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:12,665 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:12,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:12,922 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:13:12,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:12,922 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:12,922 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:12,922 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:12,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:12,923 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 12:13:12,930 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:13:12,930 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:13:12,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:12,948 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:12,965 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:13:12,965 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:18,916 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:13:18,939 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:18,940 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-24 12:13:18,940 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:18,940 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:13:18,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:13:18,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:13:18,941 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 16 states. [2018-10-24 12:13:19,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:19,289 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-24 12:13:19,301 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:13:19,301 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-10-24 12:13:19,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:19,302 INFO L225 Difference]: With dead ends: 60 [2018-10-24 12:13:19,302 INFO L226 Difference]: Without dead ends: 55 [2018-10-24 12:13:19,303 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:13:19,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-24 12:13:19,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2018-10-24 12:13:19,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-24 12:13:19,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-24 12:13:19,306 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 50 [2018-10-24 12:13:19,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:19,307 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-24 12:13:19,307 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:13:19,307 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-24 12:13:19,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-24 12:13:19,315 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:19,315 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:19,315 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:19,315 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:19,315 INFO L82 PathProgramCache]: Analyzing trace with hash -603854850, now seen corresponding path program 14 times [2018-10-24 12:13:19,316 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:19,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:19,316 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:13:19,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:19,317 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:19,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:19,735 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 12:13:19,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:19,735 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:19,735 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:19,735 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:19,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:19,735 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 12:13:19,742 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:13:19,742 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:13:47,880 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-24 12:13:47,881 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:13:47,936 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:47,957 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 12:13:47,958 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:54,588 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 12:13:54,610 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:54,610 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-24 12:13:54,610 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:54,610 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:13:54,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:13:54,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:13:54,611 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 17 states. [2018-10-24 12:13:55,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:55,194 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-24 12:13:55,194 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:13:55,194 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-10-24 12:13:55,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:55,195 INFO L225 Difference]: With dead ends: 63 [2018-10-24 12:13:55,195 INFO L226 Difference]: Without dead ends: 58 [2018-10-24 12:13:55,196 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:13:55,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-24 12:13:55,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2018-10-24 12:13:55,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-24 12:13:55,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-10-24 12:13:55,200 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 53 [2018-10-24 12:13:55,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:55,200 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-10-24 12:13:55,200 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:13:55,200 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-10-24 12:13:55,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-24 12:13:55,201 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:55,201 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:55,201 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:55,201 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:55,202 INFO L82 PathProgramCache]: Analyzing trace with hash 1012867355, now seen corresponding path program 15 times [2018-10-24 12:13:55,202 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:55,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:55,203 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:13:55,207 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:55,208 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:55,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:55,588 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 12:13:55,588 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:55,588 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:55,588 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:55,589 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:55,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:55,589 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 12:13:55,597 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:13:55,597 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:13:55,615 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:13:55,615 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:13:55,617 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:55,632 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 12:13:55,632 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:05,215 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 12:14:05,235 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:05,235 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-24 12:14:05,235 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:05,236 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:14:05,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:14:05,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:14:05,237 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 18 states. [2018-10-24 12:14:05,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:05,617 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-24 12:14:05,617 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:14:05,617 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-10-24 12:14:05,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:05,618 INFO L225 Difference]: With dead ends: 66 [2018-10-24 12:14:05,618 INFO L226 Difference]: Without dead ends: 61 [2018-10-24 12:14:05,619 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:14:05,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-24 12:14:05,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2018-10-24 12:14:05,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-24 12:14:05,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-10-24 12:14:05,624 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 56 [2018-10-24 12:14:05,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:05,624 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-10-24 12:14:05,624 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:14:05,624 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-10-24 12:14:05,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:14:05,625 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:05,625 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:05,625 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:05,625 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:05,625 INFO L82 PathProgramCache]: Analyzing trace with hash 1020819166, now seen corresponding path program 16 times [2018-10-24 12:14:05,625 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:05,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:05,626 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:14:05,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:05,626 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:05,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:06,301 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 12:14:06,302 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:06,302 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:06,302 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:06,302 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:06,302 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:06,302 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 12:14:06,309 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:06,309 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:14:06,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:06,327 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:06,397 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 12:14:06,397 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:15,436 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 12:14:15,456 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:15,456 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-24 12:14:15,456 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:15,457 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:14:15,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:14:15,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:14:15,458 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 19 states. [2018-10-24 12:14:15,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:15,889 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-24 12:14:15,889 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:14:15,889 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-10-24 12:14:15,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:15,890 INFO L225 Difference]: With dead ends: 69 [2018-10-24 12:14:15,890 INFO L226 Difference]: Without dead ends: 64 [2018-10-24 12:14:15,891 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:14:15,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-24 12:14:15,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2018-10-24 12:14:15,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-24 12:14:15,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-10-24 12:14:15,895 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 59 [2018-10-24 12:14:15,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:15,895 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-10-24 12:14:15,896 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:14:15,896 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-10-24 12:14:15,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-24 12:14:15,896 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:15,896 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:15,897 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:15,897 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:15,897 INFO L82 PathProgramCache]: Analyzing trace with hash 1690019387, now seen corresponding path program 17 times [2018-10-24 12:14:15,897 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:15,897 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:15,898 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:15,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:15,898 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:15,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:16,864 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:16,865 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:16,865 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:16,865 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:16,865 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:16,865 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:16,865 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 12:14:16,873 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:14:16,874 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:14:37,410 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-24 12:14:37,410 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:14:37,493 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:37,521 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:37,521 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:45,557 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:45,580 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:45,580 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-24 12:14:45,580 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:45,581 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:14:45,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:14:45,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:14:45,583 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 20 states. [2018-10-24 12:14:46,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:46,277 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-10-24 12:14:46,277 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:14:46,277 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-10-24 12:14:46,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:46,279 INFO L225 Difference]: With dead ends: 72 [2018-10-24 12:14:46,279 INFO L226 Difference]: Without dead ends: 67 [2018-10-24 12:14:46,280 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:14:46,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-24 12:14:46,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2018-10-24 12:14:46,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-24 12:14:46,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-10-24 12:14:46,284 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 62 [2018-10-24 12:14:46,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:46,284 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-10-24 12:14:46,285 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:14:46,285 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-10-24 12:14:46,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-24 12:14:46,285 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:46,285 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:46,286 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:46,286 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:46,286 INFO L82 PathProgramCache]: Analyzing trace with hash 595615166, now seen corresponding path program 18 times [2018-10-24 12:14:46,286 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:46,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:46,287 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:14:46,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:46,287 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:46,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:46,675 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 12:14:46,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:46,685 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:46,685 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:46,685 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:46,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:46,686 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 12:14:46,695 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:14:46,695 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:14:46,717 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:14:46,717 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:14:46,719 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:46,736 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 12:14:46,736 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:57,006 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 12:14:57,028 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:57,028 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-24 12:14:57,028 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:57,028 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:14:57,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:14:57,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:14:57,029 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 21 states. [2018-10-24 12:14:57,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:57,669 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-24 12:14:57,670 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:14:57,670 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-10-24 12:14:57,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:57,671 INFO L225 Difference]: With dead ends: 75 [2018-10-24 12:14:57,671 INFO L226 Difference]: Without dead ends: 70 [2018-10-24 12:14:57,672 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:14:57,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-24 12:14:57,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2018-10-24 12:14:57,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-24 12:14:57,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-10-24 12:14:57,675 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 65 [2018-10-24 12:14:57,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:57,675 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-10-24 12:14:57,675 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:14:57,675 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-10-24 12:14:57,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-24 12:14:57,676 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:57,676 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:57,676 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:57,676 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:57,676 INFO L82 PathProgramCache]: Analyzing trace with hash 296211291, now seen corresponding path program 19 times [2018-10-24 12:14:57,676 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:57,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:57,677 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:14:57,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:57,677 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:57,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:58,963 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 12:14:58,963 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:58,963 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:58,963 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:58,963 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:58,963 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:58,963 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 12:14:58,970 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:58,971 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:14:58,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:59,001 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:59,039 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 12:14:59,039 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:09,079 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 12:15:09,101 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:09,101 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-24 12:15:09,101 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:09,101 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:15:09,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:15:09,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:15:09,102 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 22 states. [2018-10-24 12:15:09,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:09,670 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2018-10-24 12:15:09,670 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:15:09,670 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-10-24 12:15:09,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:09,671 INFO L225 Difference]: With dead ends: 78 [2018-10-24 12:15:09,671 INFO L226 Difference]: Without dead ends: 73 [2018-10-24 12:15:09,672 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:15:09,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-10-24 12:15:09,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2018-10-24 12:15:09,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-24 12:15:09,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2018-10-24 12:15:09,677 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 68 [2018-10-24 12:15:09,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:09,677 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2018-10-24 12:15:09,677 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:15:09,677 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2018-10-24 12:15:09,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-24 12:15:09,678 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:09,678 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:09,678 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:09,678 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:09,678 INFO L82 PathProgramCache]: Analyzing trace with hash 1402444958, now seen corresponding path program 20 times [2018-10-24 12:15:09,678 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:09,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:09,679 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:09,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:09,679 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:09,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:10,521 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 12:15:10,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:10,522 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:10,522 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:10,522 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:10,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:10,522 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 12:15:10,531 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:15:10,532 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:15:33,532 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-24 12:15:33,533 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:15:33,566 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:33,685 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 12:15:33,685 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:35,748 WARN L179 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:15:38,675 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:15:41,377 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 12:15:41,399 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:41,399 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 24] total 45 [2018-10-24 12:15:41,399 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:41,400 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:15:41,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:15:41,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:15:41,401 INFO L87 Difference]: Start difference. First operand 72 states and 72 transitions. Second operand 23 states. [2018-10-24 12:15:42,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:42,027 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-10-24 12:15:42,027 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:15:42,027 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 71 [2018-10-24 12:15:42,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:42,029 INFO L225 Difference]: With dead ends: 81 [2018-10-24 12:15:42,029 INFO L226 Difference]: Without dead ends: 76 [2018-10-24 12:15:42,030 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 111 SyntacticMatches, 11 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:15:42,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-10-24 12:15:42,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2018-10-24 12:15:42,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-24 12:15:42,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-10-24 12:15:42,035 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 71 [2018-10-24 12:15:42,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:42,036 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-10-24 12:15:42,036 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:15:42,036 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-10-24 12:15:42,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-24 12:15:42,036 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:42,036 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:42,037 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:42,037 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:42,037 INFO L82 PathProgramCache]: Analyzing trace with hash 1925556347, now seen corresponding path program 21 times [2018-10-24 12:15:42,037 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:42,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:42,038 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:15:42,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:42,038 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:42,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:42,762 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:42,762 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:42,763 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:42,763 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:42,763 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:42,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:42,763 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 12:15:42,771 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:15:42,772 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:15:42,795 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:15:42,795 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:15:42,797 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:42,818 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:42,818 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:56,986 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 669 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:57,006 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:57,006 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-10-24 12:15:57,006 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:57,006 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:15:57,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:15:57,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=1496, Unknown=1, NotChecked=0, Total=2070 [2018-10-24 12:15:57,008 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 24 states. [2018-10-24 12:15:57,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:57,713 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2018-10-24 12:15:57,713 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 12:15:57,713 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 74 [2018-10-24 12:15:57,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:57,714 INFO L225 Difference]: With dead ends: 84 [2018-10-24 12:15:57,715 INFO L226 Difference]: Without dead ends: 79 [2018-10-24 12:15:57,716 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 126 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=573, Invalid=1496, Unknown=1, NotChecked=0, Total=2070 [2018-10-24 12:15:57,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-24 12:15:57,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2018-10-24 12:15:57,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-24 12:15:57,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 78 transitions. [2018-10-24 12:15:57,721 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 78 transitions. Word has length 74 [2018-10-24 12:15:57,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:57,721 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 78 transitions. [2018-10-24 12:15:57,721 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:15:57,721 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 78 transitions. [2018-10-24 12:15:57,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-24 12:15:57,722 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:57,722 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:57,722 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:57,722 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:57,722 INFO L82 PathProgramCache]: Analyzing trace with hash -499371138, now seen corresponding path program 22 times [2018-10-24 12:15:57,722 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:57,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:57,723 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:15:57,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:57,723 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:57,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:58,169 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:58,169 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:58,170 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:58,170 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:58,170 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:58,170 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:58,170 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:58,178 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:58,178 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:15:58,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:58,201 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:58,220 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:58,220 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-10-24 12:16:10,269 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-24 12:16:10,470 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:10,470 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-24 12:16:10,476 WARN L205 ceAbstractionStarter]: Timeout [2018-10-24 12:16:10,476 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:16:10 BoogieIcfgContainer [2018-10-24 12:16:10,476 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:16:10,477 INFO L168 Benchmark]: Toolchain (without parser) took 274652.60 ms. Allocated memory was 1.5 GB in the beginning and 2.5 GB in the end (delta: 961.0 MB). Free memory was 1.4 GB in the beginning and 1.9 GB in the end (delta: -458.6 MB). Peak memory consumption was 502.4 MB. Max. memory is 7.1 GB. [2018-10-24 12:16:10,478 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:16:10,479 INFO L168 Benchmark]: CACSL2BoogieTranslator took 251.87 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:16:10,479 INFO L168 Benchmark]: Boogie Procedure Inliner took 22.43 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:16:10,480 INFO L168 Benchmark]: Boogie Preprocessor took 23.37 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:16:10,480 INFO L168 Benchmark]: RCFGBuilder took 350.50 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 724.0 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -773.5 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. [2018-10-24 12:16:10,481 INFO L168 Benchmark]: TraceAbstraction took 273999.34 ms. Allocated memory was 2.2 GB in the beginning and 2.5 GB in the end (delta: 237.0 MB). Free memory was 2.2 GB in the beginning and 1.9 GB in the end (delta: 304.3 MB). Peak memory consumption was 541.3 MB. Max. memory is 7.1 GB. [2018-10-24 12:16:10,484 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 251.87 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 22.43 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 23.37 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 350.50 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 724.0 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -773.5 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 273999.34 ms. Allocated memory was 2.2 GB in the beginning and 2.5 GB in the end (delta: 237.0 MB). Free memory was 2.2 GB in the beginning and 1.9 GB in the end (delta: 304.3 MB). Peak memory consumption was 541.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 78 with TraceHistMax 23,while TraceCheckSpWp was constructing backward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 44 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. TIMEOUT Result, 273.9s OverallTime, 31 OverallIterations, 23 TraceHistogramMax, 8.5s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 590 SDtfs, 34 SDslu, 5785 SDs, 0 SdLazy, 8368 SolverSat, 5 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 6.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2458 GetRequests, 1828 SyntacticMatches, 65 SemanticMatches, 565 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 125.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=78occurred in iteration=30, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 1.2s AbstIntTime, 3 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 30 MinimizatonAttempts, 32 StatesRemovedByMinimization, 28 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 118.0s SatisfiabilityAnalysisTime, 131.7s InterpolantComputationTime, 2137 NumberOfCodeBlocks, 2131 NumberOfCodeBlocksAsserted, 150 NumberOfCheckSat, 3109 ConstructedInterpolants, 5 QuantifiedInterpolants, 892777 SizeOfPredicates, 33 NumberOfNonLiveVariables, 2173 ConjunctsInSsa, 580 ConjunctsInUnsatCore, 86 InterpolantComputations, 7 PerfectInterpolantSequences, 103/15558 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown