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/underapprox_false-unreach-call2_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:01:52,120 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:01:52,122 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:01:52,134 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:01:52,134 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:01:52,135 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:01:52,137 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:01:52,139 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:01:52,140 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:01:52,141 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:01:52,142 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:01:52,142 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:01:52,143 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:01:52,145 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:01:52,147 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:01:52,148 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:01:52,149 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:01:52,154 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:01:52,163 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:01:52,170 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:01:52,171 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:01:52,173 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:01:52,179 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-22 16:01:52,179 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-22 16:01:52,180 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-22 16:01:52,182 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-22 16:01:52,185 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-22 16:01:52,186 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-22 16:01:52,189 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-22 16:01:52,190 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-22 16:01:52,190 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-22 16:01:52,191 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-22 16:01:52,195 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 [2018-10-22 16:01:52,225 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:01:52,225 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:01:52,229 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:01:52,229 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:01:52,230 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:01:52,230 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:01:52,230 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:01:52,230 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:01:52,230 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:01:52,231 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:01:52,231 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:01:52,231 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:01:52,232 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:01:52,232 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:01:52,233 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:01:52,233 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:01:52,233 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:01:52,233 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:01:52,233 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:01:52,234 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:01:52,234 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:01:52,234 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:01:52,234 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:01:52,234 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:01:52,235 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:01:52,235 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:01:52,235 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:01:52,235 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:01:52,235 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:01:52,236 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:01:52,236 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:01:52,236 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:01:52,236 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:01:52,236 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:01:52,283 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:01:52,295 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:01:52,299 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:01:52,301 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:01:52,301 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:01:52,302 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_false-unreach-call2_true-termination.i [2018-10-22 16:01:52,355 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/dcd5feab6/67d698eee08e4d039ff02069a368aa40/FLAG70688148b [2018-10-22 16:01:52,745 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:01:52,745 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_false-unreach-call2_true-termination.i [2018-10-22 16:01:52,751 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/dcd5feab6/67d698eee08e4d039ff02069a368aa40/FLAG70688148b [2018-10-22 16:01:52,767 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/dcd5feab6/67d698eee08e4d039ff02069a368aa40 [2018-10-22 16:01:52,778 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:01:52,779 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:01:52,780 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:01:52,780 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:01:52,784 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:01:52,785 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:01:52" (1/1) ... [2018-10-22 16:01:52,788 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@68b10951 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:01:52, skipping insertion in model container [2018-10-22 16:01:52,788 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:01:52" (1/1) ... [2018-10-22 16:01:52,799 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:01:52,822 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:01:53,016 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:01:53,020 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:01:53,039 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:01:53,057 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:01:53,058 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:01:53 WrapperNode [2018-10-22 16:01:53,058 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:01:53,059 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:01:53,059 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:01:53,059 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:01:53,069 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:01:53" (1/1) ... [2018-10-22 16:01:53,074 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:01:53" (1/1) ... [2018-10-22 16:01:53,082 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:01:53,082 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:01:53,082 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:01:53,082 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:01:53,093 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:01:53" (1/1) ... [2018-10-22 16:01:53,093 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:01:53" (1/1) ... [2018-10-22 16:01:53,094 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:01:53" (1/1) ... [2018-10-22 16:01:53,094 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:01:53" (1/1) ... [2018-10-22 16:01:53,097 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:01:53" (1/1) ... [2018-10-22 16:01:53,104 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:01:53" (1/1) ... [2018-10-22 16:01:53,106 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:01:53" (1/1) ... [2018-10-22 16:01:53,107 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:01:53,108 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:01:53,108 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:01:53,108 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:01:53,109 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:01:53" (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 [2018-10-22 16:01:53,171 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:01:53,172 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:01:53,172 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:01:53,172 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:01:53,172 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:01:53,172 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:01:53,173 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:01:53,173 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:01:53,469 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:01:53,469 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:01:53 BoogieIcfgContainer [2018-10-22 16:01:53,469 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:01:53,470 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:01:53,471 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:01:53,474 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:01:53,474 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:01:52" (1/3) ... [2018-10-22 16:01:53,475 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@314d2160 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:01:53, skipping insertion in model container [2018-10-22 16:01:53,475 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:01:53" (2/3) ... [2018-10-22 16:01:53,475 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@314d2160 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:01:53, skipping insertion in model container [2018-10-22 16:01:53,476 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:01:53" (3/3) ... [2018-10-22 16:01:53,477 INFO L112 eAbstractionObserver]: Analyzing ICFG underapprox_false-unreach-call2_true-termination.i [2018-10-22 16:01:53,487 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:01:53,495 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:01:53,512 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:01:53,546 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:01:53,547 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:01:53,547 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:01:53,547 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:01:53,548 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:01:53,548 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:01:53,548 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:01:53,548 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:01:53,548 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:01:53,566 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-10-22 16:01:53,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-22 16:01:53,572 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:53,573 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:53,576 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:53,583 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:53,583 INFO L82 PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times [2018-10-22 16:01:53,586 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:53,638 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:53,639 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:53,639 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:53,639 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:53,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:53,696 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:53,699 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:01:53,699 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:01:53,699 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:01:53,704 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:01:53,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:01:53,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:01:53,719 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-10-22 16:01:53,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:53,740 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-10-22 16:01:53,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:01:53,742 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-22 16:01:53,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:53,750 INFO L225 Difference]: With dead ends: 29 [2018-10-22 16:01:53,750 INFO L226 Difference]: Without dead ends: 12 [2018-10-22 16:01:53,754 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 [2018-10-22 16:01:53,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-22 16:01:53,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-22 16:01:53,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-22 16:01:53,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-22 16:01:53,789 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-10-22 16:01:53,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:53,790 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-22 16:01:53,790 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:01:53,790 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-22 16:01:53,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-22 16:01:53,791 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:53,791 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:53,792 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:53,792 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:53,792 INFO L82 PathProgramCache]: Analyzing trace with hash -571410792, now seen corresponding path program 1 times [2018-10-22 16:01:53,793 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:53,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:53,794 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:53,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:53,794 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:53,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:53,959 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:53,959 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:01:53,960 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 16:01:53,960 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:01:53,963 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:01:53,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:01:53,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:01:53,964 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2018-10-22 16:01:54,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:54,017 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-22 16:01:54,020 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:01:54,020 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-22 16:01:54,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:54,021 INFO L225 Difference]: With dead ends: 19 [2018-10-22 16:01:54,021 INFO L226 Difference]: Without dead ends: 14 [2018-10-22 16:01:54,022 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 [2018-10-22 16:01:54,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-22 16:01:54,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-22 16:01:54,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-22 16:01:54,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-22 16:01:54,028 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-22 16:01:54,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:54,029 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-22 16:01:54,029 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:01:54,030 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-22 16:01:54,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-22 16:01:54,030 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:54,031 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:54,031 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:54,031 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:54,031 INFO L82 PathProgramCache]: Analyzing trace with hash 1625028318, now seen corresponding path program 1 times [2018-10-22 16:01:54,031 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:54,033 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:54,033 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:54,034 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:54,034 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:54,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:54,253 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:54,253 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:54,253 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:54,254 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-10-22 16:01:54,256 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [20], [23], [25], [31], [32], [33], [35] [2018-10-22 16:01:54,303 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:01:54,303 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:01:54,424 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:01:54,636 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:01:54,637 INFO L272 AbstractInterpreter]: Visited 12 different actions 64 times. Merged at 3 different actions 25 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-22 16:01:54,671 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:54,672 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:01:54,673 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:54,673 INFO L197 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 [2018-10-22 16:01:54,688 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:54,689 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:01:54,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:54,733 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:54,777 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:54,778 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:54,963 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:54,996 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:54,997 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:55,025 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:55,026 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:01:55,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:55,048 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:55,316 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:55,316 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:55,332 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:55,334 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:55,335 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 6, 6, 6] total 10 [2018-10-22 16:01:55,335 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:55,335 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-22 16:01:55,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-22 16:01:55,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:01:55,337 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2018-10-22 16:01:55,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:55,374 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-22 16:01:55,375 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-22 16:01:55,375 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-10-22 16:01:55,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:55,376 INFO L225 Difference]: With dead ends: 21 [2018-10-22 16:01:55,376 INFO L226 Difference]: Without dead ends: 16 [2018-10-22 16:01:55,377 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 42 SyntacticMatches, 5 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:01:55,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-22 16:01:55,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-22 16:01:55,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-22 16:01:55,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-22 16:01:55,381 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-22 16:01:55,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:55,382 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-22 16:01:55,382 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-22 16:01:55,382 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-22 16:01:55,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-22 16:01:55,382 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:55,383 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:55,383 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:55,383 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:55,383 INFO L82 PathProgramCache]: Analyzing trace with hash -720896604, now seen corresponding path program 2 times [2018-10-22 16:01:55,383 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:55,384 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:55,384 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:55,385 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:55,385 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:55,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:55,650 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:55,651 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:55,651 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:55,651 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:55,651 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:55,651 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:55,652 INFO L197 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 [2018-10-22 16:01:55,673 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:01:55,673 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:55,692 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:01:55,692 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:55,694 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:55,719 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:55,719 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:55,952 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:55,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:55,976 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:55,991 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:01:55,992 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:56,010 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:01:56,010 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:56,014 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:56,159 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:56,160 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:56,189 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:56,192 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:56,193 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 7, 7, 7] total 12 [2018-10-22 16:01:56,193 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:56,193 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 16:01:56,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 16:01:56,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:01:56,194 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 5 states. [2018-10-22 16:01:56,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:56,226 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-22 16:01:56,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 16:01:56,228 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-10-22 16:01:56,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:56,229 INFO L225 Difference]: With dead ends: 23 [2018-10-22 16:01:56,229 INFO L226 Difference]: Without dead ends: 18 [2018-10-22 16:01:56,230 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 49 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:01:56,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-22 16:01:56,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-22 16:01:56,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-22 16:01:56,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-22 16:01:56,235 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-22 16:01:56,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:56,235 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-22 16:01:56,235 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 16:01:56,236 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-22 16:01:56,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 16:01:56,236 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:56,237 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:56,237 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:56,237 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:56,237 INFO L82 PathProgramCache]: Analyzing trace with hash -296916246, now seen corresponding path program 3 times [2018-10-22 16:01:56,237 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:56,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:56,239 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:56,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:56,239 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:56,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:56,352 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:56,352 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:56,353 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:56,353 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:56,353 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:56,353 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:56,354 INFO L197 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 [2018-10-22 16:01:56,365 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:01:56,365 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:01:56,385 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:01:56,385 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:56,387 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:56,405 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:56,405 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:56,571 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:56,592 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:56,592 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:56,607 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:01:56,608 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:01:56,641 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:01:56,642 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:56,646 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:56,814 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:56,814 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:56,867 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:56,872 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:56,873 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 8, 8, 8] total 14 [2018-10-22 16:01:56,873 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:56,873 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 16:01:56,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 16:01:56,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:01:56,874 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2018-10-22 16:01:57,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:57,069 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-22 16:01:57,069 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 16:01:57,069 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2018-10-22 16:01:57,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:57,070 INFO L225 Difference]: With dead ends: 25 [2018-10-22 16:01:57,070 INFO L226 Difference]: Without dead ends: 20 [2018-10-22 16:01:57,071 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 56 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:01:57,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-22 16:01:57,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-22 16:01:57,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-22 16:01:57,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-22 16:01:57,076 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-22 16:01:57,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:57,076 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-22 16:01:57,077 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 16:01:57,077 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-22 16:01:57,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-22 16:01:57,077 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:57,077 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:57,078 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:57,078 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:57,078 INFO L82 PathProgramCache]: Analyzing trace with hash -873685328, now seen corresponding path program 4 times [2018-10-22 16:01:57,078 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:57,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:57,079 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:57,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:57,080 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:57,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:57,196 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:57,197 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:57,197 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:57,197 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:57,197 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:57,197 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:57,198 INFO L197 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 [2018-10-22 16:01:57,206 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:01:57,206 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:01:57,217 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:01:57,218 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:57,220 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:57,239 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:57,239 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:57,432 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:57,453 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:57,453 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:57,469 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:01:57,469 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:01:57,492 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:01:57,492 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:57,496 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:57,572 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:57,573 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:57,599 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:57,601 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:57,601 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9, 9, 9] total 16 [2018-10-22 16:01:57,601 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:57,602 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 16:01:57,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 16:01:57,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2018-10-22 16:01:57,603 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 7 states. [2018-10-22 16:01:57,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:57,662 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-22 16:01:57,663 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 16:01:57,663 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-10-22 16:01:57,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:57,664 INFO L225 Difference]: With dead ends: 27 [2018-10-22 16:01:57,664 INFO L226 Difference]: Without dead ends: 22 [2018-10-22 16:01:57,665 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2018-10-22 16:01:57,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-22 16:01:57,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-22 16:01:57,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-22 16:01:57,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-22 16:01:57,670 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-22 16:01:57,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:57,671 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-22 16:01:57,671 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 16:01:57,671 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-22 16:01:57,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-22 16:01:57,671 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:57,672 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:57,672 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:57,672 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:57,672 INFO L82 PathProgramCache]: Analyzing trace with hash -1097991946, now seen corresponding path program 5 times [2018-10-22 16:01:57,672 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:57,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:57,673 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:57,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:57,674 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:57,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:57,948 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:57,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:57,948 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:57,948 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:57,949 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:57,949 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:57,949 INFO L197 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 [2018-10-22 16:01:57,965 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:01:57,965 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:58,016 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:01:58,016 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:58,018 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:58,030 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:58,030 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:58,300 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:58,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:58,322 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:58,338 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:01:58,338 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:58,382 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:01:58,382 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:58,385 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:58,463 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:58,463 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:58,469 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:58,471 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:58,472 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 10, 10, 10] total 18 [2018-10-22 16:01:58,472 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:58,472 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 16:01:58,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 16:01:58,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:01:58,473 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 8 states. [2018-10-22 16:01:58,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:58,539 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-10-22 16:01:58,540 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 16:01:58,541 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-10-22 16:01:58,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:58,541 INFO L225 Difference]: With dead ends: 29 [2018-10-22 16:01:58,542 INFO L226 Difference]: Without dead ends: 24 [2018-10-22 16:01:58,542 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 70 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:01:58,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-22 16:01:58,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-22 16:01:58,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-22 16:01:58,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-22 16:01:58,547 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-22 16:01:58,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:58,548 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-22 16:01:58,548 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 16:01:58,548 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-22 16:01:58,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-22 16:01:58,549 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:58,549 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:58,549 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:58,549 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:58,549 INFO L82 PathProgramCache]: Analyzing trace with hash -1908287044, now seen corresponding path program 6 times [2018-10-22 16:01:58,549 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:58,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:58,550 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:58,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:58,551 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:58,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-22 16:01:58,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-22 16:01:58,608 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-10-22 16:01:58,640 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 04:01:58 BoogieIcfgContainer [2018-10-22 16:01:58,641 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-22 16:01:58,641 INFO L168 Benchmark]: Toolchain (without parser) took 5863.28 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 702.5 MB). Free memory was 1.4 GB in the beginning and 1.8 GB in the end (delta: -418.5 MB). Peak memory consumption was 284.0 MB. Max. memory is 7.1 GB. [2018-10-22 16:01:58,644 INFO L168 Benchmark]: CDTParser took 0.19 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. [2018-10-22 16:01:58,644 INFO L168 Benchmark]: CACSL2BoogieTranslator took 278.02 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. [2018-10-22 16:01:58,645 INFO L168 Benchmark]: Boogie Procedure Inliner took 23.04 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. [2018-10-22 16:01:58,646 INFO L168 Benchmark]: Boogie Preprocessor took 25.42 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. [2018-10-22 16:01:58,646 INFO L168 Benchmark]: RCFGBuilder took 361.72 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 702.5 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -753.3 MB). Peak memory consumption was 27.0 MB. Max. memory is 7.1 GB. [2018-10-22 16:01:58,647 INFO L168 Benchmark]: TraceAbstraction took 5170.38 ms. Allocated memory is still 2.2 GB. Free memory was 2.1 GB in the beginning and 1.8 GB in the end (delta: 324.2 MB). Peak memory consumption was 324.2 MB. Max. memory is 7.1 GB. [2018-10-22 16:01:58,651 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 278.02 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 23.04 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 25.42 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 361.72 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 702.5 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -753.3 MB). Peak memory consumption was 27.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 5170.38 ms. Allocated memory is still 2.2 GB. Free memory was 2.1 GB in the beginning and 1.8 GB in the end (delta: 324.2 MB). Peak memory consumption was 324.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 4]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L9] unsigned int x = 0; [L10] unsigned int y = 1; VAL [x=0, y=1] [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 VAL [x=1, y=2] [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 VAL [x=2, y=4] [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 VAL [x=3, y=8] [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 VAL [x=4, y=16] [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 VAL [x=5, y=32] [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 VAL [x=6, y=64] [L11] COND FALSE !(x < 6) VAL [x=6, y=64] [L15] CALL __VERIFIER_assert(x != 6) VAL [\old(cond)=0] [L3] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L4] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 18 locations, 1 error locations. UNSAFE Result, 5.1s OverallTime, 8 OverallIterations, 7 TraceHistogramMax, 0.5s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 99 SDtfs, 0 SDslu, 239 SDs, 0 SdLazy, 133 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 371 GetRequests, 284 SyntacticMatches, 26 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 2.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=24occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.4s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 3.1s InterpolantComputationTime, 299 NumberOfCodeBlocks, 299 NumberOfCodeBlocksAsserted, 38 NumberOfCheckSat, 419 ConstructedInterpolants, 0 QuantifiedInterpolants, 30581 SizeOfPredicates, 10 NumberOfNonLiveVariables, 430 ConjunctsInSsa, 145 ConjunctsInUnsatCore, 27 InterpolantComputations, 2 PerfectInterpolantSequences, 0/350 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...