java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_false-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 16:36:01,325 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 16:36:01,327 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 16:36:01,339 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 16:36:01,339 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 16:36:01,340 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 16:36:01,342 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 16:36:01,344 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 16:36:01,348 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 16:36:01,349 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 16:36:01,350 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 16:36:01,350 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 16:36:01,351 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 16:36:01,352 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 16:36:01,354 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 16:36:01,355 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 16:36:01,356 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 16:36:01,361 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 16:36:01,363 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 16:36:01,364 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 16:36:01,366 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 16:36:01,368 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 16:36:01,371 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-11-07 16:36:01,382 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-07 16:36:01,382 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-07 16:36:01,383 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-07 16:36:01,384 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-07 16:36:01,384 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf [2018-11-07 16:36:01,408 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 16:36:01,408 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 16:36:01,409 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 16:36:01,409 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 16:36:01,409 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 16:36:01,410 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 16:36:01,410 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 16:36:01,410 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 16:36:01,410 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 16:36:01,411 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 16:36:01,411 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 16:36:01,411 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 16:36:01,412 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 16:36:01,412 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 16:36:01,412 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 16:36:01,412 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 16:36:01,413 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 16:36:01,413 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 16:36:01,413 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 16:36:01,413 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 16:36:01,413 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 16:36:01,414 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 16:36:01,414 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 16:36:01,414 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 16:36:01,414 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 16:36:01,414 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 16:36:01,415 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 16:36:01,415 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 16:36:01,415 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 16:36:01,415 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 16:36:01,415 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 16:36:01,416 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 16:36:01,416 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 16:36:01,416 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 16:36:01,480 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 16:36:01,495 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 16:36:01,499 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 16:36:01,500 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 16:36:01,501 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 16:36:01,501 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_false-unreach-call1_true-termination.i [2018-11-07 16:36:01,563 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/74115b0a2/4bb91e6d28104375957ddb88dc507302/FLAGa268356fb [2018-11-07 16:36:01,971 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 16:36:01,971 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_false-unreach-call1_true-termination.i [2018-11-07 16:36:01,979 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/74115b0a2/4bb91e6d28104375957ddb88dc507302/FLAGa268356fb [2018-11-07 16:36:01,998 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/74115b0a2/4bb91e6d28104375957ddb88dc507302 [2018-11-07 16:36:02,011 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 16:36:02,013 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 16:36:02,015 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 16:36:02,015 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 16:36:02,019 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 16:36:02,020 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:36:02" (1/1) ... [2018-11-07 16:36:02,023 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@42844b5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:36:02, skipping insertion in model container [2018-11-07 16:36:02,023 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:36:02" (1/1) ... [2018-11-07 16:36:02,035 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 16:36:02,059 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 16:36:02,311 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 16:36:02,316 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 16:36:02,340 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 16:36:02,366 INFO L193 MainTranslator]: Completed translation [2018-11-07 16:36:02,366 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:36:02 WrapperNode [2018-11-07 16:36:02,367 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 16:36:02,368 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 16:36:02,368 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 16:36:02,368 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 16:36:02,378 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:36:02" (1/1) ... [2018-11-07 16:36:02,388 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:36:02" (1/1) ... [2018-11-07 16:36:02,395 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 16:36:02,396 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 16:36:02,396 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 16:36:02,396 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 16:36:02,406 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:36:02" (1/1) ... [2018-11-07 16:36:02,406 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:36:02" (1/1) ... [2018-11-07 16:36:02,408 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:36:02" (1/1) ... [2018-11-07 16:36:02,408 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:36:02" (1/1) ... [2018-11-07 16:36:02,413 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:36:02" (1/1) ... [2018-11-07 16:36:02,418 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:36:02" (1/1) ... [2018-11-07 16:36:02,419 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:36:02" (1/1) ... [2018-11-07 16:36:02,421 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 16:36:02,421 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 16:36:02,422 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 16:36:02,422 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 16:36:02,423 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:36:02" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 16:36:02,555 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2018-11-07 16:36:02,556 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 16:36:02,556 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 16:36:02,556 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-11-07 16:36:02,556 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 16:36:02,556 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 16:36:02,556 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 16:36:02,557 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 16:36:02,557 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2018-11-07 16:36:02,557 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 16:36:02,557 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 16:36:02,557 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-11-07 16:36:02,887 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 16:36:02,888 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:36:02 BoogieIcfgContainer [2018-11-07 16:36:02,888 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 16:36:02,889 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 16:36:02,889 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 16:36:02,894 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 16:36:02,894 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 04:36:02" (1/3) ... [2018-11-07 16:36:02,895 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3084c724 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:36:02, skipping insertion in model container [2018-11-07 16:36:02,895 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:36:02" (2/3) ... [2018-11-07 16:36:02,895 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3084c724 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:36:02, skipping insertion in model container [2018-11-07 16:36:02,896 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:36:02" (3/3) ... [2018-11-07 16:36:02,897 INFO L112 eAbstractionObserver]: Analyzing ICFG array_false-unreach-call1_true-termination.i [2018-11-07 16:36:02,906 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 16:36:02,913 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 16:36:02,928 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 16:36:02,963 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 16:36:02,963 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 16:36:02,963 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 16:36:02,964 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 16:36:02,964 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 16:36:02,964 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 16:36:02,964 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 16:36:02,964 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 16:36:02,983 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2018-11-07 16:36:02,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-07 16:36:02,990 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:02,991 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:02,993 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:02,999 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:02,999 INFO L82 PathProgramCache]: Analyzing trace with hash 526261342, now seen corresponding path program 1 times [2018-11-07 16:36:03,001 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:03,049 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:03,050 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:03,050 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:03,050 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:03,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:03,130 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:03,132 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 16:36:03,133 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 16:36:03,133 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 16:36:03,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 16:36:03,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 16:36:03,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 16:36:03,153 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 2 states. [2018-11-07 16:36:03,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:03,175 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2018-11-07 16:36:03,175 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 16:36:03,176 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-11-07 16:36:03,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:03,183 INFO L225 Difference]: With dead ends: 41 [2018-11-07 16:36:03,183 INFO L226 Difference]: Without dead ends: 17 [2018-11-07 16:36:03,187 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 16:36:03,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-11-07 16:36:03,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-11-07 16:36:03,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-11-07 16:36:03,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-11-07 16:36:03,221 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 13 [2018-11-07 16:36:03,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:03,221 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-11-07 16:36:03,221 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 16:36:03,222 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-11-07 16:36:03,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-11-07 16:36:03,222 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:03,223 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:03,223 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:03,223 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:03,224 INFO L82 PathProgramCache]: Analyzing trace with hash -1427482147, now seen corresponding path program 1 times [2018-11-07 16:36:03,224 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:03,225 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:03,225 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:03,225 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:03,225 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:03,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:03,289 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:03,290 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 16:36:03,290 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-07 16:36:03,290 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 16:36:03,292 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 16:36:03,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 16:36:03,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 16:36:03,293 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 3 states. [2018-11-07 16:36:03,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:03,352 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-11-07 16:36:03,353 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 16:36:03,353 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2018-11-07 16:36:03,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:03,355 INFO L225 Difference]: With dead ends: 27 [2018-11-07 16:36:03,355 INFO L226 Difference]: Without dead ends: 21 [2018-11-07 16:36:03,357 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 16:36:03,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-11-07 16:36:03,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2018-11-07 16:36:03,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-11-07 16:36:03,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-11-07 16:36:03,362 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 14 [2018-11-07 16:36:03,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:03,363 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-11-07 16:36:03,363 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 16:36:03,363 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-11-07 16:36:03,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-11-07 16:36:03,364 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:03,364 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:03,365 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:03,365 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:03,365 INFO L82 PathProgramCache]: Analyzing trace with hash -1966302602, now seen corresponding path program 1 times [2018-11-07 16:36:03,365 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:03,367 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:03,367 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:03,367 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:03,367 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:03,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:03,450 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:03,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:03,451 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:03,452 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-11-07 16:36:03,454 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [6], [10], [13], [15], [16], [18], [22], [28], [31], [33], [39], [40], [41], [43] [2018-11-07 16:36:03,490 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 16:36:03,490 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 16:36:03,731 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 16:36:03,733 INFO L272 AbstractInterpreter]: Visited 17 different actions 45 times. Merged at 4 different actions 22 times. Widened at 1 different actions 2 times. Found 1 fixpoints after 1 different actions. Largest state had 15 variables. [2018-11-07 16:36:03,775 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:03,777 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 16:36:03,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:03,778 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:03,795 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:03,796 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:36:03,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:03,846 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:03,909 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:03,909 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:03,967 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:03,990 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:03,990 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2018-11-07 16:36:03,990 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:03,991 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-07 16:36:03,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-07 16:36:03,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-11-07 16:36:03,992 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 5 states. [2018-11-07 16:36:04,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:04,066 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-11-07 16:36:04,067 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-07 16:36:04,068 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2018-11-07 16:36:04,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:04,069 INFO L225 Difference]: With dead ends: 31 [2018-11-07 16:36:04,069 INFO L226 Difference]: Without dead ends: 25 [2018-11-07 16:36:04,069 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-11-07 16:36:04,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-11-07 16:36:04,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2018-11-07 16:36:04,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-11-07 16:36:04,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-11-07 16:36:04,078 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 18 [2018-11-07 16:36:04,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:04,079 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-11-07 16:36:04,079 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-07 16:36:04,079 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-11-07 16:36:04,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-11-07 16:36:04,081 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:04,081 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:04,082 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:04,082 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:04,082 INFO L82 PathProgramCache]: Analyzing trace with hash 939189903, now seen corresponding path program 2 times [2018-11-07 16:36:04,082 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:04,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:04,084 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:04,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:04,084 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:04,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:04,217 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:04,218 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:04,218 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:04,218 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:04,219 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:04,219 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:04,219 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:04,243 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:36:04,243 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:36:04,305 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 16:36:04,305 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:04,308 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:04,417 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:04,417 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:04,598 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:04,619 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:04,619 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-11-07 16:36:04,620 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:04,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 16:36:04,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 16:36:04,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-11-07 16:36:04,621 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 6 states. [2018-11-07 16:36:04,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:04,667 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-11-07 16:36:04,670 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 16:36:04,670 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2018-11-07 16:36:04,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:04,671 INFO L225 Difference]: With dead ends: 35 [2018-11-07 16:36:04,671 INFO L226 Difference]: Without dead ends: 29 [2018-11-07 16:36:04,672 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-11-07 16:36:04,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-11-07 16:36:04,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2018-11-07 16:36:04,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-11-07 16:36:04,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-11-07 16:36:04,678 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 22 [2018-11-07 16:36:04,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:04,678 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-11-07 16:36:04,678 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 16:36:04,678 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-11-07 16:36:04,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-11-07 16:36:04,679 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:04,680 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:04,680 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:04,680 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:04,680 INFO L82 PathProgramCache]: Analyzing trace with hash -830243288, now seen corresponding path program 3 times [2018-11-07 16:36:04,681 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:04,682 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:04,682 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:36:04,682 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:04,682 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:04,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:04,780 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:04,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:04,780 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:04,780 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:04,781 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:04,781 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:04,781 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:04,797 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:36:04,798 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:36:04,838 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:36:04,838 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:04,841 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:04,863 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:04,864 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:04,973 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:04,996 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:04,996 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2018-11-07 16:36:04,997 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:04,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-07 16:36:04,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-07 16:36:04,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-11-07 16:36:04,998 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 7 states. [2018-11-07 16:36:05,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:05,068 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-11-07 16:36:05,072 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 16:36:05,072 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 26 [2018-11-07 16:36:05,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:05,073 INFO L225 Difference]: With dead ends: 39 [2018-11-07 16:36:05,073 INFO L226 Difference]: Without dead ends: 33 [2018-11-07 16:36:05,074 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-11-07 16:36:05,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-11-07 16:36:05,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2018-11-07 16:36:05,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-11-07 16:36:05,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-11-07 16:36:05,080 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 26 [2018-11-07 16:36:05,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:05,080 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-11-07 16:36:05,080 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-07 16:36:05,080 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-11-07 16:36:05,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-11-07 16:36:05,081 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:05,082 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:05,082 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:05,082 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:05,082 INFO L82 PathProgramCache]: Analyzing trace with hash 961847617, now seen corresponding path program 4 times [2018-11-07 16:36:05,083 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:05,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:05,084 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:36:05,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:05,084 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:05,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:05,278 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:05,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:05,279 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:05,279 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:05,279 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:05,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:05,279 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:05,288 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:05,288 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:36:05,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:05,317 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:05,432 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:05,433 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:05,721 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:05,750 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:05,750 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-11-07 16:36:05,751 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:05,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-07 16:36:05,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-07 16:36:05,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-11-07 16:36:05,753 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 8 states. [2018-11-07 16:36:05,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:05,804 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-11-07 16:36:05,805 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-07 16:36:05,805 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 30 [2018-11-07 16:36:05,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:05,807 INFO L225 Difference]: With dead ends: 43 [2018-11-07 16:36:05,807 INFO L226 Difference]: Without dead ends: 37 [2018-11-07 16:36:05,808 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-11-07 16:36:05,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-11-07 16:36:05,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2018-11-07 16:36:05,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-11-07 16:36:05,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-11-07 16:36:05,813 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 30 [2018-11-07 16:36:05,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:05,814 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-11-07 16:36:05,814 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-07 16:36:05,814 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-11-07 16:36:05,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-11-07 16:36:05,815 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:05,815 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:05,816 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:05,816 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:05,816 INFO L82 PathProgramCache]: Analyzing trace with hash -1036218406, now seen corresponding path program 5 times [2018-11-07 16:36:05,816 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:05,817 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:05,817 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:05,817 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:05,818 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:05,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:05,925 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:05,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:05,926 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:05,926 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:05,926 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:05,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:05,926 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:05,936 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:36:05,936 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:36:05,998 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 16:36:05,998 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:06,003 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:06,028 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:06,029 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:06,191 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:06,213 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:06,213 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-11-07 16:36:06,213 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:06,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 16:36:06,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 16:36:06,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-11-07 16:36:06,216 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 9 states. [2018-11-07 16:36:06,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:06,322 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-11-07 16:36:06,324 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-07 16:36:06,324 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 34 [2018-11-07 16:36:06,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:06,325 INFO L225 Difference]: With dead ends: 47 [2018-11-07 16:36:06,325 INFO L226 Difference]: Without dead ends: 41 [2018-11-07 16:36:06,326 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-11-07 16:36:06,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-11-07 16:36:06,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2018-11-07 16:36:06,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-11-07 16:36:06,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-11-07 16:36:06,332 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 34 [2018-11-07 16:36:06,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:06,332 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-11-07 16:36:06,333 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 16:36:06,333 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-11-07 16:36:06,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-11-07 16:36:06,334 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:06,334 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:06,334 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:06,334 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:06,335 INFO L82 PathProgramCache]: Analyzing trace with hash -1578530317, now seen corresponding path program 6 times [2018-11-07 16:36:06,335 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:06,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:06,336 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:36:06,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:06,336 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:06,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:06,496 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:06,497 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:06,497 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:06,497 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:06,497 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:06,497 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:06,497 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:06,506 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:36:06,507 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:36:06,550 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:36:06,550 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:06,553 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:06,592 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:06,592 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:06,807 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:06,827 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:06,828 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2018-11-07 16:36:06,828 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:06,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 16:36:06,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 16:36:06,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-11-07 16:36:06,829 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 10 states. [2018-11-07 16:36:06,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:06,883 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-11-07 16:36:06,886 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-07 16:36:06,886 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 38 [2018-11-07 16:36:06,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:06,888 INFO L225 Difference]: With dead ends: 51 [2018-11-07 16:36:06,888 INFO L226 Difference]: Without dead ends: 45 [2018-11-07 16:36:06,890 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-11-07 16:36:06,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-11-07 16:36:06,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2018-11-07 16:36:06,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-11-07 16:36:06,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-11-07 16:36:06,895 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 38 [2018-11-07 16:36:06,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:06,895 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-11-07 16:36:06,895 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 16:36:06,896 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-11-07 16:36:06,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-11-07 16:36:06,897 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:06,897 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:06,897 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:06,898 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:06,898 INFO L82 PathProgramCache]: Analyzing trace with hash -1880502388, now seen corresponding path program 7 times [2018-11-07 16:36:06,898 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:06,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:06,899 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:36:06,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:06,899 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:06,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:07,054 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:07,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:07,055 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:07,055 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:07,055 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:07,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:07,055 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:07,065 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:07,065 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:36:07,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:07,093 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:07,112 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:07,112 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:07,296 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:07,316 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:07,316 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-11-07 16:36:07,317 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:07,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-07 16:36:07,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-07 16:36:07,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-11-07 16:36:07,318 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 11 states. [2018-11-07 16:36:07,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:07,479 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-11-07 16:36:07,480 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 16:36:07,480 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 42 [2018-11-07 16:36:07,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:07,482 INFO L225 Difference]: With dead ends: 55 [2018-11-07 16:36:07,482 INFO L226 Difference]: Without dead ends: 49 [2018-11-07 16:36:07,483 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-11-07 16:36:07,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-11-07 16:36:07,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2018-11-07 16:36:07,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-11-07 16:36:07,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-11-07 16:36:07,488 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 42 [2018-11-07 16:36:07,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:07,489 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-11-07 16:36:07,489 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-07 16:36:07,489 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-11-07 16:36:07,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-11-07 16:36:07,490 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:07,490 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:07,490 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:07,490 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:07,491 INFO L82 PathProgramCache]: Analyzing trace with hash 1386979493, now seen corresponding path program 8 times [2018-11-07 16:36:07,491 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:07,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:07,492 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:07,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:07,492 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:07,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:07,786 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:07,786 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:07,787 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:07,787 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:07,787 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:07,787 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:07,787 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:07,798 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:36:07,798 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:36:07,928 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 16:36:07,929 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:07,934 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:08,059 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:08,059 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:08,453 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:08,475 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:08,476 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-11-07 16:36:08,476 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:08,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-07 16:36:08,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-07 16:36:08,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-11-07 16:36:08,478 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 12 states. [2018-11-07 16:36:08,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:08,540 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-11-07 16:36:08,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 16:36:08,541 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 46 [2018-11-07 16:36:08,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:08,542 INFO L225 Difference]: With dead ends: 59 [2018-11-07 16:36:08,543 INFO L226 Difference]: Without dead ends: 53 [2018-11-07 16:36:08,544 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-11-07 16:36:08,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-11-07 16:36:08,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2018-11-07 16:36:08,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-11-07 16:36:08,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-11-07 16:36:08,549 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 46 [2018-11-07 16:36:08,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:08,550 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-11-07 16:36:08,550 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-07 16:36:08,550 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-11-07 16:36:08,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-11-07 16:36:08,551 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:08,551 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:08,552 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:08,552 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:08,552 INFO L82 PathProgramCache]: Analyzing trace with hash 1333607742, now seen corresponding path program 9 times [2018-11-07 16:36:08,552 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:08,553 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:08,553 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:36:08,553 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:08,553 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:08,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:08,737 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:08,737 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:08,738 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:08,738 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:08,738 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:08,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:08,738 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:08,753 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:36:08,753 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:36:08,777 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:36:08,777 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:08,781 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:08,808 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:08,808 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:09,044 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:09,065 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:09,065 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2018-11-07 16:36:09,066 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:09,066 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 16:36:09,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 16:36:09,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-07 16:36:09,067 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 13 states. [2018-11-07 16:36:09,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:09,151 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-11-07 16:36:09,151 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-07 16:36:09,151 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 50 [2018-11-07 16:36:09,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:09,153 INFO L225 Difference]: With dead ends: 63 [2018-11-07 16:36:09,153 INFO L226 Difference]: Without dead ends: 57 [2018-11-07 16:36:09,154 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-11-07 16:36:09,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-07 16:36:09,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2018-11-07 16:36:09,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-11-07 16:36:09,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-11-07 16:36:09,160 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 50 [2018-11-07 16:36:09,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:09,160 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-11-07 16:36:09,160 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 16:36:09,160 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-11-07 16:36:09,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-11-07 16:36:09,161 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:09,161 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:09,162 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:09,162 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:09,162 INFO L82 PathProgramCache]: Analyzing trace with hash 445441367, now seen corresponding path program 10 times [2018-11-07 16:36:09,162 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:09,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:09,163 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:36:09,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:09,164 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:09,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:09,425 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:09,425 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:09,425 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:09,426 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:09,426 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:09,426 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:09,426 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:09,436 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:09,436 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:36:09,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:09,474 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:09,499 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:09,500 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:09,874 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:09,894 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:09,895 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-11-07 16:36:09,895 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:09,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 16:36:09,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 16:36:09,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-11-07 16:36:09,897 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 14 states. [2018-11-07 16:36:09,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:09,970 INFO L93 Difference]: Finished difference Result 67 states and 67 transitions. [2018-11-07 16:36:09,972 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 16:36:09,972 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2018-11-07 16:36:09,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:09,973 INFO L225 Difference]: With dead ends: 67 [2018-11-07 16:36:09,973 INFO L226 Difference]: Without dead ends: 61 [2018-11-07 16:36:09,974 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-11-07 16:36:09,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-11-07 16:36:09,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2018-11-07 16:36:09,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-11-07 16:36:09,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-11-07 16:36:09,980 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 54 [2018-11-07 16:36:09,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:09,980 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-11-07 16:36:09,981 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 16:36:09,981 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-11-07 16:36:09,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-11-07 16:36:09,982 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:09,982 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:09,982 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:09,982 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:09,983 INFO L82 PathProgramCache]: Analyzing trace with hash 115923184, now seen corresponding path program 11 times [2018-11-07 16:36:09,983 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:09,984 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:09,984 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:09,984 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:09,984 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:09,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:10,195 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:10,195 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:10,195 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:10,195 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:10,195 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:10,195 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:10,195 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:10,204 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:36:10,204 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:36:10,314 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-07 16:36:10,314 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:10,316 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:10,349 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:10,350 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:10,635 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:10,655 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:10,655 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-11-07 16:36:10,656 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:10,656 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-07 16:36:10,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-07 16:36:10,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-11-07 16:36:10,657 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 15 states. [2018-11-07 16:36:10,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:10,818 INFO L93 Difference]: Finished difference Result 71 states and 71 transitions. [2018-11-07 16:36:10,818 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 16:36:10,818 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 58 [2018-11-07 16:36:10,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:10,819 INFO L225 Difference]: With dead ends: 71 [2018-11-07 16:36:10,819 INFO L226 Difference]: Without dead ends: 65 [2018-11-07 16:36:10,820 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-11-07 16:36:10,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-11-07 16:36:10,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2018-11-07 16:36:10,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-11-07 16:36:10,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-11-07 16:36:10,827 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 58 [2018-11-07 16:36:10,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:10,827 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-11-07 16:36:10,827 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-07 16:36:10,827 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-11-07 16:36:10,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-11-07 16:36:10,829 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:10,829 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:10,830 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:10,830 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:10,830 INFO L82 PathProgramCache]: Analyzing trace with hash -1233168375, now seen corresponding path program 12 times [2018-11-07 16:36:10,830 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:10,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:10,831 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:36:10,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:10,831 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:10,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:11,212 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:11,212 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:11,212 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:11,212 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:11,212 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:11,212 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:11,213 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:11,221 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:36:11,222 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:36:11,258 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:36:11,258 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:11,262 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:11,281 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:11,281 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:11,595 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:11,615 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:11,615 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2018-11-07 16:36:11,615 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:11,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 16:36:11,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 16:36:11,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-11-07 16:36:11,617 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 16 states. [2018-11-07 16:36:11,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:11,775 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-11-07 16:36:11,775 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-07 16:36:11,775 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 62 [2018-11-07 16:36:11,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:11,776 INFO L225 Difference]: With dead ends: 75 [2018-11-07 16:36:11,776 INFO L226 Difference]: Without dead ends: 69 [2018-11-07 16:36:11,777 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-11-07 16:36:11,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-11-07 16:36:11,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2018-11-07 16:36:11,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-11-07 16:36:11,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2018-11-07 16:36:11,783 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 62 [2018-11-07 16:36:11,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:11,784 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2018-11-07 16:36:11,784 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 16:36:11,784 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2018-11-07 16:36:11,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-11-07 16:36:11,785 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:11,785 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:11,785 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:11,785 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:11,786 INFO L82 PathProgramCache]: Analyzing trace with hash -1440832862, now seen corresponding path program 13 times [2018-11-07 16:36:11,786 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:11,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:11,787 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:36:11,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:11,787 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:11,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:12,071 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:12,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:12,071 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:12,071 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:12,071 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:12,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:12,072 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:12,080 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:12,080 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:36:12,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:12,113 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:12,219 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:12,219 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:13,111 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:13,131 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:13,131 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-11-07 16:36:13,131 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:13,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-07 16:36:13,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-07 16:36:13,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-11-07 16:36:13,133 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 17 states. [2018-11-07 16:36:13,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:13,204 INFO L93 Difference]: Finished difference Result 79 states and 79 transitions. [2018-11-07 16:36:13,205 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 16:36:13,206 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 66 [2018-11-07 16:36:13,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:13,207 INFO L225 Difference]: With dead ends: 79 [2018-11-07 16:36:13,207 INFO L226 Difference]: Without dead ends: 73 [2018-11-07 16:36:13,208 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-11-07 16:36:13,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-11-07 16:36:13,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2018-11-07 16:36:13,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-11-07 16:36:13,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2018-11-07 16:36:13,215 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 66 [2018-11-07 16:36:13,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:13,216 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2018-11-07 16:36:13,216 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-07 16:36:13,216 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2018-11-07 16:36:13,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-11-07 16:36:13,217 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:13,217 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:13,217 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:13,218 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:13,218 INFO L82 PathProgramCache]: Analyzing trace with hash -780863301, now seen corresponding path program 14 times [2018-11-07 16:36:13,218 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:13,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:13,219 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:13,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:13,219 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:13,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:13,521 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:13,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:13,521 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:13,521 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:13,522 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:13,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:13,522 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:13,533 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:36:13,533 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:36:13,708 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-07 16:36:13,708 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:13,710 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:13,762 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:13,763 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:14,174 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:14,198 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:14,198 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-11-07 16:36:14,198 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:14,199 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-07 16:36:14,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-07 16:36:14,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 16:36:14,200 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 18 states. [2018-11-07 16:36:14,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:14,350 INFO L93 Difference]: Finished difference Result 83 states and 83 transitions. [2018-11-07 16:36:14,353 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 16:36:14,353 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 70 [2018-11-07 16:36:14,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:14,354 INFO L225 Difference]: With dead ends: 83 [2018-11-07 16:36:14,355 INFO L226 Difference]: Without dead ends: 77 [2018-11-07 16:36:14,356 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 16:36:14,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-11-07 16:36:14,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2018-11-07 16:36:14,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-11-07 16:36:14,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-11-07 16:36:14,366 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 70 [2018-11-07 16:36:14,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:14,366 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-11-07 16:36:14,366 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-07 16:36:14,366 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-11-07 16:36:14,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-11-07 16:36:14,367 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:14,367 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:14,371 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:14,371 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:14,371 INFO L82 PathProgramCache]: Analyzing trace with hash 454072916, now seen corresponding path program 15 times [2018-11-07 16:36:14,371 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:14,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:14,372 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:36:14,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:14,372 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:14,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:14,626 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:14,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:14,626 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:14,626 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:14,626 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:14,627 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:14,627 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:14,643 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:36:14,643 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:36:14,716 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:36:14,716 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:14,719 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:14,732 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:14,733 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:15,667 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:15,688 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:15,688 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 35 [2018-11-07 16:36:15,688 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:15,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 16:36:15,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 16:36:15,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 16:36:15,689 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 19 states. [2018-11-07 16:36:15,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:15,773 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2018-11-07 16:36:15,773 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-07 16:36:15,774 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 74 [2018-11-07 16:36:15,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:15,775 INFO L225 Difference]: With dead ends: 87 [2018-11-07 16:36:15,775 INFO L226 Difference]: Without dead ends: 81 [2018-11-07 16:36:15,776 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 16:36:15,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-11-07 16:36:15,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2018-11-07 16:36:15,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-11-07 16:36:15,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2018-11-07 16:36:15,781 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 74 [2018-11-07 16:36:15,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:15,782 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2018-11-07 16:36:15,782 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 16:36:15,782 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2018-11-07 16:36:15,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-11-07 16:36:15,783 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:15,784 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:15,784 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:15,784 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:15,784 INFO L82 PathProgramCache]: Analyzing trace with hash 73385837, now seen corresponding path program 16 times [2018-11-07 16:36:15,784 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:15,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:15,787 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:36:15,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:15,788 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:15,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:16,102 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:16,103 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:16,103 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:16,103 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:16,103 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:16,103 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:16,103 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:16,112 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:16,112 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:36:16,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:16,140 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:16,162 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:16,162 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:17,127 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:17,148 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:17,148 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-11-07 16:36:17,148 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:17,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-07 16:36:17,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-07 16:36:17,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-11-07 16:36:17,149 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 20 states. [2018-11-07 16:36:17,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:17,238 INFO L93 Difference]: Finished difference Result 91 states and 91 transitions. [2018-11-07 16:36:17,239 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 16:36:17,239 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 78 [2018-11-07 16:36:17,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:17,240 INFO L225 Difference]: With dead ends: 91 [2018-11-07 16:36:17,240 INFO L226 Difference]: Without dead ends: 85 [2018-11-07 16:36:17,241 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-11-07 16:36:17,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-11-07 16:36:17,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2018-11-07 16:36:17,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-11-07 16:36:17,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2018-11-07 16:36:17,245 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 78 [2018-11-07 16:36:17,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:17,246 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2018-11-07 16:36:17,246 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-07 16:36:17,246 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2018-11-07 16:36:17,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-11-07 16:36:17,247 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:17,247 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:17,247 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:17,248 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:17,248 INFO L82 PathProgramCache]: Analyzing trace with hash 699449350, now seen corresponding path program 17 times [2018-11-07 16:36:17,248 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:17,249 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:17,249 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:17,249 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:17,249 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:17,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:17,503 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 578 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:17,503 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:17,503 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:17,504 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:17,504 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:17,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:17,504 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:17,513 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:36:17,514 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:36:17,952 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-11-07 16:36:17,952 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:17,956 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:17,989 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 578 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:17,989 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:18,509 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 578 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:18,529 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:18,530 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-11-07 16:36:18,530 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:18,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-07 16:36:18,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-07 16:36:18,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-11-07 16:36:18,531 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 21 states. [2018-11-07 16:36:18,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:18,649 INFO L93 Difference]: Finished difference Result 95 states and 95 transitions. [2018-11-07 16:36:18,649 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-07 16:36:18,649 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 82 [2018-11-07 16:36:18,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:18,651 INFO L225 Difference]: With dead ends: 95 [2018-11-07 16:36:18,651 INFO L226 Difference]: Without dead ends: 89 [2018-11-07 16:36:18,652 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-11-07 16:36:18,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-11-07 16:36:18,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2018-11-07 16:36:18,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-11-07 16:36:18,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2018-11-07 16:36:18,656 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 82 [2018-11-07 16:36:18,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:18,656 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2018-11-07 16:36:18,656 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-07 16:36:18,656 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2018-11-07 16:36:18,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-11-07 16:36:18,657 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:18,658 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:18,658 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:18,658 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:18,658 INFO L82 PathProgramCache]: Analyzing trace with hash -701381601, now seen corresponding path program 18 times [2018-11-07 16:36:18,658 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:18,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:18,659 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:36:18,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:18,659 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:18,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:19,068 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:19,068 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:19,068 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:19,068 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:19,068 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:19,068 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:19,068 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:19,078 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:36:19,078 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:36:19,186 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:36:19,186 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:19,188 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:19,206 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:19,206 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:19,636 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:19,658 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:19,658 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2018-11-07 16:36:19,658 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:19,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-07 16:36:19,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-07 16:36:19,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-11-07 16:36:19,659 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 22 states. [2018-11-07 16:36:19,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:19,750 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2018-11-07 16:36:19,751 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-07 16:36:19,751 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 86 [2018-11-07 16:36:19,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:19,752 INFO L225 Difference]: With dead ends: 99 [2018-11-07 16:36:19,753 INFO L226 Difference]: Without dead ends: 93 [2018-11-07 16:36:19,754 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-11-07 16:36:19,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-11-07 16:36:19,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 91. [2018-11-07 16:36:19,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-11-07 16:36:19,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2018-11-07 16:36:19,757 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 86 [2018-11-07 16:36:19,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:19,757 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2018-11-07 16:36:19,757 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-07 16:36:19,758 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2018-11-07 16:36:19,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-11-07 16:36:19,758 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:19,758 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:19,759 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:19,759 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:19,759 INFO L82 PathProgramCache]: Analyzing trace with hash -1812917320, now seen corresponding path program 19 times [2018-11-07 16:36:19,759 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:19,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:19,760 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:36:19,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:19,760 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:19,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:20,667 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 0 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:20,667 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:20,667 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:20,667 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:20,668 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:20,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:20,668 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:20,676 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:20,676 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:36:20,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:20,701 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:20,720 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 0 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:20,721 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:21,216 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 0 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:21,239 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:21,239 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-11-07 16:36:21,239 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:21,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-07 16:36:21,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-07 16:36:21,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-11-07 16:36:21,242 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 23 states. [2018-11-07 16:36:21,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:21,393 INFO L93 Difference]: Finished difference Result 103 states and 103 transitions. [2018-11-07 16:36:21,393 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-07 16:36:21,393 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 90 [2018-11-07 16:36:21,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:21,395 INFO L225 Difference]: With dead ends: 103 [2018-11-07 16:36:21,395 INFO L226 Difference]: Without dead ends: 97 [2018-11-07 16:36:21,396 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-11-07 16:36:21,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-11-07 16:36:21,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 95. [2018-11-07 16:36:21,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-11-07 16:36:21,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2018-11-07 16:36:21,399 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 90 [2018-11-07 16:36:21,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:21,400 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2018-11-07 16:36:21,400 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-07 16:36:21,400 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2018-11-07 16:36:21,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-11-07 16:36:21,401 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:21,401 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:21,402 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:21,402 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:21,402 INFO L82 PathProgramCache]: Analyzing trace with hash -1143148847, now seen corresponding path program 20 times [2018-11-07 16:36:21,402 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:21,403 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:21,403 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:21,403 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:21,403 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:21,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:21,890 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 0 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:21,891 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:21,891 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:21,891 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:21,891 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:21,891 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:21,891 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:21,906 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:36:21,906 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:36:22,555 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-11-07 16:36:22,556 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:22,559 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:22,581 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 0 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:22,581 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:23,617 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 0 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:23,637 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:23,637 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-11-07 16:36:23,637 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:23,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-07 16:36:23,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-07 16:36:23,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-11-07 16:36:23,639 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 24 states. [2018-11-07 16:36:23,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:23,770 INFO L93 Difference]: Finished difference Result 107 states and 107 transitions. [2018-11-07 16:36:23,773 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-07 16:36:23,773 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 94 [2018-11-07 16:36:23,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:23,774 INFO L225 Difference]: With dead ends: 107 [2018-11-07 16:36:23,774 INFO L226 Difference]: Without dead ends: 101 [2018-11-07 16:36:23,776 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-11-07 16:36:23,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2018-11-07 16:36:23,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 99. [2018-11-07 16:36:23,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-11-07 16:36:23,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2018-11-07 16:36:23,780 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 94 [2018-11-07 16:36:23,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:23,780 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2018-11-07 16:36:23,780 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-07 16:36:23,781 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2018-11-07 16:36:23,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-11-07 16:36:23,781 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:23,781 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:23,782 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:23,782 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:23,782 INFO L82 PathProgramCache]: Analyzing trace with hash 96703850, now seen corresponding path program 21 times [2018-11-07 16:36:23,782 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:23,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:23,783 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:36:23,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:23,783 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:23,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:24,119 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 0 proven. 882 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:24,119 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:24,119 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:24,119 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:24,119 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:24,120 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:24,120 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:24,129 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:36:24,130 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:36:24,355 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:36:24,355 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:24,359 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:24,379 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 0 proven. 882 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:24,380 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:24,920 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 0 proven. 882 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:24,941 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:24,941 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2018-11-07 16:36:24,941 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:24,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-07 16:36:24,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-07 16:36:24,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-11-07 16:36:24,943 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 25 states. [2018-11-07 16:36:25,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:25,080 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2018-11-07 16:36:25,080 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-07 16:36:25,080 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 98 [2018-11-07 16:36:25,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:25,082 INFO L225 Difference]: With dead ends: 111 [2018-11-07 16:36:25,082 INFO L226 Difference]: Without dead ends: 105 [2018-11-07 16:36:25,084 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-11-07 16:36:25,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-11-07 16:36:25,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 103. [2018-11-07 16:36:25,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2018-11-07 16:36:25,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2018-11-07 16:36:25,087 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 98 [2018-11-07 16:36:25,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:25,088 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2018-11-07 16:36:25,088 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-07 16:36:25,088 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2018-11-07 16:36:25,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-11-07 16:36:25,089 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:25,089 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:25,089 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:25,089 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:25,089 INFO L82 PathProgramCache]: Analyzing trace with hash 408110979, now seen corresponding path program 22 times [2018-11-07 16:36:25,090 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:25,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:25,090 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:36:25,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:25,091 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:25,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:25,395 INFO L134 CoverageAnalysis]: Checked inductivity of 968 backedges. 0 proven. 968 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:25,396 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:25,396 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:25,396 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:25,396 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:25,396 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:25,396 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:25,405 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:25,406 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:36:25,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:25,434 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:25,466 INFO L134 CoverageAnalysis]: Checked inductivity of 968 backedges. 0 proven. 968 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:25,466 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:26,220 INFO L134 CoverageAnalysis]: Checked inductivity of 968 backedges. 0 proven. 968 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:26,239 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:26,239 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-11-07 16:36:26,239 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:26,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-07 16:36:26,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-07 16:36:26,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-11-07 16:36:26,241 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 26 states. [2018-11-07 16:36:26,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:26,385 INFO L93 Difference]: Finished difference Result 115 states and 115 transitions. [2018-11-07 16:36:26,385 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-07 16:36:26,385 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 102 [2018-11-07 16:36:26,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:26,386 INFO L225 Difference]: With dead ends: 115 [2018-11-07 16:36:26,386 INFO L226 Difference]: Without dead ends: 109 [2018-11-07 16:36:26,388 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 181 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-11-07 16:36:26,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-11-07 16:36:26,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 107. [2018-11-07 16:36:26,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-11-07 16:36:26,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2018-11-07 16:36:26,392 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 102 [2018-11-07 16:36:26,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:26,392 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2018-11-07 16:36:26,392 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-07 16:36:26,392 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2018-11-07 16:36:26,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2018-11-07 16:36:26,393 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:26,393 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:26,393 INFO L423 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:26,394 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:26,394 INFO L82 PathProgramCache]: Analyzing trace with hash 421152028, now seen corresponding path program 23 times [2018-11-07 16:36:26,394 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:26,394 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:26,395 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:26,395 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:26,395 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:26,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:26,765 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 0 proven. 1058 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:26,765 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:26,766 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:26,766 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:26,766 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:26,766 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:26,766 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:26,775 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:36:26,775 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:36:28,677 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-11-07 16:36:28,677 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:28,682 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:28,699 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 0 proven. 1058 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:28,699 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:29,394 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 0 proven. 1058 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:29,415 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:29,415 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-11-07 16:36:29,415 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:29,415 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-11-07 16:36:29,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-11-07 16:36:29,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-11-07 16:36:29,417 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 27 states. [2018-11-07 16:36:29,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:29,556 INFO L93 Difference]: Finished difference Result 119 states and 119 transitions. [2018-11-07 16:36:29,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-07 16:36:29,556 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 106 [2018-11-07 16:36:29,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:29,558 INFO L225 Difference]: With dead ends: 119 [2018-11-07 16:36:29,558 INFO L226 Difference]: Without dead ends: 113 [2018-11-07 16:36:29,559 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 188 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-11-07 16:36:29,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2018-11-07 16:36:29,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 111. [2018-11-07 16:36:29,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-11-07 16:36:29,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2018-11-07 16:36:29,563 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 106 [2018-11-07 16:36:29,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:29,564 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2018-11-07 16:36:29,564 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-11-07 16:36:29,564 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2018-11-07 16:36:29,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-11-07 16:36:29,565 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:29,565 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:29,565 INFO L423 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:29,565 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:29,565 INFO L82 PathProgramCache]: Analyzing trace with hash 1015467573, now seen corresponding path program 24 times [2018-11-07 16:36:29,566 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:29,566 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:29,566 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:36:29,566 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:29,567 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:29,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:30,091 INFO L134 CoverageAnalysis]: Checked inductivity of 1152 backedges. 0 proven. 1152 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:30,091 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:30,091 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:30,091 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:30,092 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:30,092 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:30,092 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:30,102 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:36:30,102 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:36:30,573 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:36:30,573 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:30,578 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:30,635 INFO L134 CoverageAnalysis]: Checked inductivity of 1152 backedges. 0 proven. 1152 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:30,636 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:31,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1152 backedges. 0 proven. 1152 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:31,384 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:31,385 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 53 [2018-11-07 16:36:31,385 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:31,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-07 16:36:31,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-07 16:36:31,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-11-07 16:36:31,387 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 28 states. [2018-11-07 16:36:31,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:31,562 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2018-11-07 16:36:31,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-11-07 16:36:31,562 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 110 [2018-11-07 16:36:31,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:31,563 INFO L225 Difference]: With dead ends: 123 [2018-11-07 16:36:31,563 INFO L226 Difference]: Without dead ends: 117 [2018-11-07 16:36:31,565 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-11-07 16:36:31,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-11-07 16:36:31,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 115. [2018-11-07 16:36:31,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-11-07 16:36:31,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2018-11-07 16:36:31,568 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 110 [2018-11-07 16:36:31,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:31,569 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2018-11-07 16:36:31,569 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-07 16:36:31,569 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2018-11-07 16:36:31,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-11-07 16:36:31,570 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:31,570 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:31,570 INFO L423 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:31,570 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:31,570 INFO L82 PathProgramCache]: Analyzing trace with hash 1441211086, now seen corresponding path program 25 times [2018-11-07 16:36:31,571 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:31,571 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:31,571 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:36:31,571 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:31,571 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:31,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:31,917 INFO L134 CoverageAnalysis]: Checked inductivity of 1250 backedges. 0 proven. 1250 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:31,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:31,917 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:31,917 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:31,917 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:31,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:31,917 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:31,926 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:31,926 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:36:31,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:31,957 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:31,978 INFO L134 CoverageAnalysis]: Checked inductivity of 1250 backedges. 0 proven. 1250 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:31,978 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:34,011 INFO L134 CoverageAnalysis]: Checked inductivity of 1250 backedges. 0 proven. 1250 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:34,030 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:34,030 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-11-07 16:36:34,030 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:34,031 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-11-07 16:36:34,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-11-07 16:36:34,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-11-07 16:36:34,032 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 29 states. [2018-11-07 16:36:34,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:34,152 INFO L93 Difference]: Finished difference Result 127 states and 127 transitions. [2018-11-07 16:36:34,152 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-07 16:36:34,153 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 114 [2018-11-07 16:36:34,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:34,154 INFO L225 Difference]: With dead ends: 127 [2018-11-07 16:36:34,154 INFO L226 Difference]: Without dead ends: 121 [2018-11-07 16:36:34,156 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 202 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-11-07 16:36:34,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-11-07 16:36:34,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 119. [2018-11-07 16:36:34,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-11-07 16:36:34,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2018-11-07 16:36:34,160 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 114 [2018-11-07 16:36:34,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:34,160 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2018-11-07 16:36:34,161 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-11-07 16:36:34,161 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2018-11-07 16:36:34,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2018-11-07 16:36:34,161 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:34,162 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:34,162 INFO L423 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:34,162 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:34,162 INFO L82 PathProgramCache]: Analyzing trace with hash 1734968039, now seen corresponding path program 26 times [2018-11-07 16:36:34,162 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:34,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:34,163 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:34,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:34,163 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:34,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:34,632 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 0 proven. 1352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:34,633 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:34,633 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:34,633 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:34,633 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:34,633 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:34,633 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 16:36:34,643 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:36:34,643 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:36:37,020 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-11-07 16:36:37,021 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:37,025 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:37,060 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 0 proven. 1352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:37,060 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:38,108 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 0 proven. 1352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:38,131 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:38,131 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-11-07 16:36:38,131 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:38,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-11-07 16:36:38,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-11-07 16:36:38,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-11-07 16:36:38,133 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 30 states. [2018-11-07 16:36:38,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:38,398 INFO L93 Difference]: Finished difference Result 131 states and 131 transitions. [2018-11-07 16:36:38,398 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-07 16:36:38,399 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 118 [2018-11-07 16:36:38,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:38,400 INFO L225 Difference]: With dead ends: 131 [2018-11-07 16:36:38,400 INFO L226 Difference]: Without dead ends: 125 [2018-11-07 16:36:38,402 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 209 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-11-07 16:36:38,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2018-11-07 16:36:38,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 123. [2018-11-07 16:36:38,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-11-07 16:36:38,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2018-11-07 16:36:38,406 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 118 [2018-11-07 16:36:38,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:38,406 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2018-11-07 16:36:38,406 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-11-07 16:36:38,406 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2018-11-07 16:36:38,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-11-07 16:36:38,407 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:38,407 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:38,408 INFO L423 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:38,408 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:38,408 INFO L82 PathProgramCache]: Analyzing trace with hash 840707712, now seen corresponding path program 27 times [2018-11-07 16:36:38,408 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:38,409 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:38,409 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:36:38,409 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:38,409 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:38,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:38,849 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 0 proven. 1458 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:38,849 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:38,850 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:38,850 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:38,850 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:38,850 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:38,850 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 16:36:38,859 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:36:38,859 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:36:39,361 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:36:39,361 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:39,365 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:39,393 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 0 proven. 1458 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:39,393 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:40,249 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 0 proven. 1458 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:40,270 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:40,270 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 59 [2018-11-07 16:36:40,270 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:40,270 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-11-07 16:36:40,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-11-07 16:36:40,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-11-07 16:36:40,271 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 31 states. [2018-11-07 16:36:40,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:40,423 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2018-11-07 16:36:40,424 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-11-07 16:36:40,424 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 122 [2018-11-07 16:36:40,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:40,426 INFO L225 Difference]: With dead ends: 135 [2018-11-07 16:36:40,426 INFO L226 Difference]: Without dead ends: 129 [2018-11-07 16:36:40,427 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 216 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-11-07 16:36:40,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-11-07 16:36:40,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 127. [2018-11-07 16:36:40,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-11-07 16:36:40,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 127 transitions. [2018-11-07 16:36:40,430 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 127 transitions. Word has length 122 [2018-11-07 16:36:40,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:40,430 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 127 transitions. [2018-11-07 16:36:40,430 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-11-07 16:36:40,431 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 127 transitions. [2018-11-07 16:36:40,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2018-11-07 16:36:40,431 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:40,431 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:40,432 INFO L423 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:40,432 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:40,432 INFO L82 PathProgramCache]: Analyzing trace with hash -974297703, now seen corresponding path program 28 times [2018-11-07 16:36:40,432 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:40,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:40,433 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:36:40,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:40,433 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:40,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:41,107 INFO L134 CoverageAnalysis]: Checked inductivity of 1568 backedges. 0 proven. 1568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:41,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:41,108 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:41,108 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:41,108 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:41,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:41,109 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 16:36:41,117 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:41,117 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:36:41,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:41,147 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:41,171 INFO L134 CoverageAnalysis]: Checked inductivity of 1568 backedges. 0 proven. 1568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:41,172 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:42,062 INFO L134 CoverageAnalysis]: Checked inductivity of 1568 backedges. 0 proven. 1568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:42,082 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:42,082 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-11-07 16:36:42,082 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:42,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-11-07 16:36:42,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-11-07 16:36:42,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-11-07 16:36:42,083 INFO L87 Difference]: Start difference. First operand 127 states and 127 transitions. Second operand 32 states. [2018-11-07 16:36:42,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:42,253 INFO L93 Difference]: Finished difference Result 139 states and 139 transitions. [2018-11-07 16:36:42,254 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-11-07 16:36:42,254 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 126 [2018-11-07 16:36:42,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:42,255 INFO L225 Difference]: With dead ends: 139 [2018-11-07 16:36:42,255 INFO L226 Difference]: Without dead ends: 133 [2018-11-07 16:36:42,256 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 223 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-11-07 16:36:42,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-11-07 16:36:42,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 131. [2018-11-07 16:36:42,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-11-07 16:36:42,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 131 transitions. [2018-11-07 16:36:42,260 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 131 transitions. Word has length 126 [2018-11-07 16:36:42,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:42,260 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 131 transitions. [2018-11-07 16:36:42,261 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-11-07 16:36:42,261 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 131 transitions. [2018-11-07 16:36:42,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2018-11-07 16:36:42,261 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:42,262 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:42,262 INFO L423 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:42,262 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:42,262 INFO L82 PathProgramCache]: Analyzing trace with hash 296446002, now seen corresponding path program 29 times [2018-11-07 16:36:42,262 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:42,263 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:42,263 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:42,263 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:42,263 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:42,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:42,739 INFO L134 CoverageAnalysis]: Checked inductivity of 1682 backedges. 0 proven. 1682 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:42,740 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:42,740 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:42,740 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:42,740 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:42,740 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:42,740 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-11-07 16:36:42,748 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:36:42,748 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:36:45,885 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-11-07 16:36:45,885 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:45,890 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:45,929 INFO L134 CoverageAnalysis]: Checked inductivity of 1682 backedges. 0 proven. 1682 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:45,930 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:47,034 INFO L134 CoverageAnalysis]: Checked inductivity of 1682 backedges. 0 proven. 1682 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:47,056 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:47,056 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2018-11-07 16:36:47,056 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:47,057 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-11-07 16:36:47,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-11-07 16:36:47,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-11-07 16:36:47,058 INFO L87 Difference]: Start difference. First operand 131 states and 131 transitions. Second operand 33 states. [2018-11-07 16:36:47,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:47,198 INFO L93 Difference]: Finished difference Result 143 states and 143 transitions. [2018-11-07 16:36:47,198 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-11-07 16:36:47,199 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 130 [2018-11-07 16:36:47,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:47,200 INFO L225 Difference]: With dead ends: 143 [2018-11-07 16:36:47,200 INFO L226 Difference]: Without dead ends: 137 [2018-11-07 16:36:47,201 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 230 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-11-07 16:36:47,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2018-11-07 16:36:47,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 135. [2018-11-07 16:36:47,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-11-07 16:36:47,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 135 transitions. [2018-11-07 16:36:47,205 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 135 transitions. Word has length 130 [2018-11-07 16:36:47,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:47,205 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 135 transitions. [2018-11-07 16:36:47,205 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-11-07 16:36:47,205 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 135 transitions. [2018-11-07 16:36:47,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-11-07 16:36:47,206 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:47,206 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:47,206 INFO L423 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:47,206 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:47,207 INFO L82 PathProgramCache]: Analyzing trace with hash 1929672267, now seen corresponding path program 30 times [2018-11-07 16:36:47,207 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:47,207 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:47,207 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:36:47,207 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:47,207 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:47,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:47,715 INFO L134 CoverageAnalysis]: Checked inductivity of 1800 backedges. 0 proven. 1800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:47,715 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:47,715 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:47,715 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:47,715 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:47,715 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:47,715 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:47,724 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:36:47,724 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:36:48,845 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:36:48,845 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:48,850 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:48,938 INFO L134 CoverageAnalysis]: Checked inductivity of 1800 backedges. 0 proven. 1800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:48,939 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:49,958 INFO L134 CoverageAnalysis]: Checked inductivity of 1800 backedges. 0 proven. 1800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:49,980 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:49,980 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 65 [2018-11-07 16:36:49,980 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:49,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-11-07 16:36:49,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-11-07 16:36:49,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2080, Invalid=2080, Unknown=0, NotChecked=0, Total=4160 [2018-11-07 16:36:49,982 INFO L87 Difference]: Start difference. First operand 135 states and 135 transitions. Second operand 34 states. [2018-11-07 16:36:50,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:50,154 INFO L93 Difference]: Finished difference Result 147 states and 147 transitions. [2018-11-07 16:36:50,154 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-11-07 16:36:50,154 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 134 [2018-11-07 16:36:50,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:50,155 INFO L225 Difference]: With dead ends: 147 [2018-11-07 16:36:50,155 INFO L226 Difference]: Without dead ends: 141 [2018-11-07 16:36:50,156 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 237 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2080, Invalid=2080, Unknown=0, NotChecked=0, Total=4160 [2018-11-07 16:36:50,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2018-11-07 16:36:50,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 139. [2018-11-07 16:36:50,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-11-07 16:36:50,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 139 transitions. [2018-11-07 16:36:50,160 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 139 transitions. Word has length 134 [2018-11-07 16:36:50,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:50,161 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 139 transitions. [2018-11-07 16:36:50,161 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-11-07 16:36:50,161 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 139 transitions. [2018-11-07 16:36:50,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2018-11-07 16:36:50,162 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:50,162 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:50,162 INFO L423 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:50,162 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:50,162 INFO L82 PathProgramCache]: Analyzing trace with hash 1183240164, now seen corresponding path program 31 times [2018-11-07 16:36:50,162 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:50,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:50,163 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:36:50,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:50,164 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:50,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:50,640 INFO L134 CoverageAnalysis]: Checked inductivity of 1922 backedges. 0 proven. 1922 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:50,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:50,640 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:50,640 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:50,640 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:50,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:50,641 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:50,651 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:50,651 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:36:50,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:50,691 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:50,733 INFO L134 CoverageAnalysis]: Checked inductivity of 1922 backedges. 0 proven. 1922 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:50,733 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:51,902 INFO L134 CoverageAnalysis]: Checked inductivity of 1922 backedges. 0 proven. 1922 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:51,923 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:36:51,923 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2018-11-07 16:36:51,923 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:36:51,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-11-07 16:36:51,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-11-07 16:36:51,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-11-07 16:36:51,924 INFO L87 Difference]: Start difference. First operand 139 states and 139 transitions. Second operand 35 states. [2018-11-07 16:36:52,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:36:52,061 INFO L93 Difference]: Finished difference Result 151 states and 151 transitions. [2018-11-07 16:36:52,061 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-11-07 16:36:52,061 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 138 [2018-11-07 16:36:52,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:36:52,063 INFO L225 Difference]: With dead ends: 151 [2018-11-07 16:36:52,063 INFO L226 Difference]: Without dead ends: 145 [2018-11-07 16:36:52,064 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 244 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-11-07 16:36:52,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-11-07 16:36:52,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 143. [2018-11-07 16:36:52,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2018-11-07 16:36:52,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 143 transitions. [2018-11-07 16:36:52,068 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 143 transitions. Word has length 138 [2018-11-07 16:36:52,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:36:52,068 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 143 transitions. [2018-11-07 16:36:52,069 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-11-07 16:36:52,069 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 143 transitions. [2018-11-07 16:36:52,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2018-11-07 16:36:52,069 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:36:52,070 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:36:52,070 INFO L423 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:36:52,070 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:36:52,070 INFO L82 PathProgramCache]: Analyzing trace with hash 2007020797, now seen corresponding path program 32 times [2018-11-07 16:36:52,070 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:36:52,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:52,071 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:36:52,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:36:52,071 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:36:52,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:36:53,081 INFO L134 CoverageAnalysis]: Checked inductivity of 2048 backedges. 0 proven. 2048 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:53,081 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:53,081 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:36:53,081 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:36:53,081 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:36:53,081 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:36:53,082 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:36:53,089 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:36:53,089 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:36:58,618 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-11-07 16:36:58,618 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:36:58,624 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:36:58,659 INFO L134 CoverageAnalysis]: Checked inductivity of 2048 backedges. 0 proven. 2048 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:36:58,659 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:36:59,979 INFO L134 CoverageAnalysis]: Checked inductivity of 2048 backedges. 0 proven. 2048 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:00,000 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:37:00,001 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-11-07 16:37:00,001 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:37:00,001 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-11-07 16:37:00,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-11-07 16:37:00,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-11-07 16:37:00,002 INFO L87 Difference]: Start difference. First operand 143 states and 143 transitions. Second operand 36 states. [2018-11-07 16:37:00,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:37:00,914 INFO L93 Difference]: Finished difference Result 155 states and 155 transitions. [2018-11-07 16:37:00,914 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-11-07 16:37:00,914 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 142 [2018-11-07 16:37:00,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:37:00,915 INFO L225 Difference]: With dead ends: 155 [2018-11-07 16:37:00,915 INFO L226 Difference]: Without dead ends: 149 [2018-11-07 16:37:00,916 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 251 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-11-07 16:37:00,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-11-07 16:37:00,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 147. [2018-11-07 16:37:00,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-11-07 16:37:00,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 147 transitions. [2018-11-07 16:37:00,921 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 147 transitions. Word has length 142 [2018-11-07 16:37:00,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:37:00,921 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 147 transitions. [2018-11-07 16:37:00,921 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-11-07 16:37:00,921 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 147 transitions. [2018-11-07 16:37:00,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-11-07 16:37:00,922 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:37:00,922 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:37:00,923 INFO L423 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:37:00,923 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:37:00,923 INFO L82 PathProgramCache]: Analyzing trace with hash 278947222, now seen corresponding path program 33 times [2018-11-07 16:37:00,923 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:37:00,923 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:37:00,924 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:37:00,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:37:00,924 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:37:00,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:37:01,524 INFO L134 CoverageAnalysis]: Checked inductivity of 2178 backedges. 0 proven. 2178 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:01,525 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:37:01,525 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:37:01,525 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:37:01,525 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:37:01,525 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:37:01,525 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:37:01,533 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:37:01,533 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:37:02,844 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:37:02,844 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:37:02,850 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:37:02,912 INFO L134 CoverageAnalysis]: Checked inductivity of 2178 backedges. 0 proven. 2178 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:02,912 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:37:04,453 INFO L134 CoverageAnalysis]: Checked inductivity of 2178 backedges. 0 proven. 2178 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:04,475 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:37:04,475 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 71 [2018-11-07 16:37:04,475 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:37:04,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-11-07 16:37:04,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-11-07 16:37:04,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2485, Invalid=2485, Unknown=0, NotChecked=0, Total=4970 [2018-11-07 16:37:04,477 INFO L87 Difference]: Start difference. First operand 147 states and 147 transitions. Second operand 37 states. [2018-11-07 16:37:04,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:37:04,707 INFO L93 Difference]: Finished difference Result 159 states and 159 transitions. [2018-11-07 16:37:04,708 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-11-07 16:37:04,708 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 146 [2018-11-07 16:37:04,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:37:04,710 INFO L225 Difference]: With dead ends: 159 [2018-11-07 16:37:04,710 INFO L226 Difference]: Without dead ends: 153 [2018-11-07 16:37:04,711 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 258 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2485, Invalid=2485, Unknown=0, NotChecked=0, Total=4970 [2018-11-07 16:37:04,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2018-11-07 16:37:04,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 151. [2018-11-07 16:37:04,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-11-07 16:37:04,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 151 transitions. [2018-11-07 16:37:04,716 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 151 transitions. Word has length 146 [2018-11-07 16:37:04,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:37:04,716 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 151 transitions. [2018-11-07 16:37:04,716 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-11-07 16:37:04,716 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 151 transitions. [2018-11-07 16:37:04,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-11-07 16:37:04,717 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:37:04,717 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:37:04,718 INFO L423 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:37:04,718 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:37:04,718 INFO L82 PathProgramCache]: Analyzing trace with hash -894164561, now seen corresponding path program 34 times [2018-11-07 16:37:04,718 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:37:04,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:37:04,719 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:37:04,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:37:04,719 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:37:04,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:37:05,765 INFO L134 CoverageAnalysis]: Checked inductivity of 2312 backedges. 0 proven. 2312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:05,765 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:37:05,765 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:37:05,765 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:37:05,765 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:37:05,765 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:37:05,766 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:37:05,773 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:37:05,773 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:37:05,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:37:05,811 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:37:05,933 INFO L134 CoverageAnalysis]: Checked inductivity of 2312 backedges. 0 proven. 2312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:05,933 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:37:07,776 INFO L134 CoverageAnalysis]: Checked inductivity of 2312 backedges. 0 proven. 2312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:07,795 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:37:07,796 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-11-07 16:37:07,796 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:37:07,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-11-07 16:37:07,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-11-07 16:37:07,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-11-07 16:37:07,797 INFO L87 Difference]: Start difference. First operand 151 states and 151 transitions. Second operand 38 states. [2018-11-07 16:37:08,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:37:08,208 INFO L93 Difference]: Finished difference Result 163 states and 163 transitions. [2018-11-07 16:37:08,208 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-11-07 16:37:08,209 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 150 [2018-11-07 16:37:08,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:37:08,210 INFO L225 Difference]: With dead ends: 163 [2018-11-07 16:37:08,210 INFO L226 Difference]: Without dead ends: 157 [2018-11-07 16:37:08,211 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 265 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-11-07 16:37:08,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-11-07 16:37:08,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 155. [2018-11-07 16:37:08,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 155 states. [2018-11-07 16:37:08,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 155 transitions. [2018-11-07 16:37:08,216 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 155 transitions. Word has length 150 [2018-11-07 16:37:08,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:37:08,216 INFO L480 AbstractCegarLoop]: Abstraction has 155 states and 155 transitions. [2018-11-07 16:37:08,216 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-11-07 16:37:08,217 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 155 transitions. [2018-11-07 16:37:08,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2018-11-07 16:37:08,217 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:37:08,218 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:37:08,218 INFO L423 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:37:08,218 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:37:08,218 INFO L82 PathProgramCache]: Analyzing trace with hash -1645598392, now seen corresponding path program 35 times [2018-11-07 16:37:08,218 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:37:08,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:37:08,219 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:37:08,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:37:08,219 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:37:08,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:37:09,477 INFO L134 CoverageAnalysis]: Checked inductivity of 2450 backedges. 0 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:09,477 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:37:09,477 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:37:09,478 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:37:09,478 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:37:09,478 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:37:09,478 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:37:09,499 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:37:09,500 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:37:19,486 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-11-07 16:37:19,486 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:37:19,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:37:19,533 INFO L134 CoverageAnalysis]: Checked inductivity of 2450 backedges. 0 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:19,533 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:37:21,119 INFO L134 CoverageAnalysis]: Checked inductivity of 2450 backedges. 0 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:21,141 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:37:21,141 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 75 [2018-11-07 16:37:21,141 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:37:21,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-11-07 16:37:21,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-11-07 16:37:21,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-11-07 16:37:21,142 INFO L87 Difference]: Start difference. First operand 155 states and 155 transitions. Second operand 39 states. [2018-11-07 16:37:21,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:37:21,935 INFO L93 Difference]: Finished difference Result 167 states and 167 transitions. [2018-11-07 16:37:21,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-11-07 16:37:21,935 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 154 [2018-11-07 16:37:21,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:37:21,936 INFO L225 Difference]: With dead ends: 167 [2018-11-07 16:37:21,936 INFO L226 Difference]: Without dead ends: 161 [2018-11-07 16:37:21,937 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 272 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-11-07 16:37:21,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2018-11-07 16:37:21,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 159. [2018-11-07 16:37:21,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-11-07 16:37:21,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 159 transitions. [2018-11-07 16:37:21,941 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 159 transitions. Word has length 154 [2018-11-07 16:37:21,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:37:21,941 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 159 transitions. [2018-11-07 16:37:21,941 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-11-07 16:37:21,941 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 159 transitions. [2018-11-07 16:37:21,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-11-07 16:37:21,942 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:37:21,942 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:37:21,943 INFO L423 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:37:21,943 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:37:21,943 INFO L82 PathProgramCache]: Analyzing trace with hash 1362148449, now seen corresponding path program 36 times [2018-11-07 16:37:21,943 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:37:21,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:37:21,944 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:37:21,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:37:21,944 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:37:21,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:37:23,074 INFO L134 CoverageAnalysis]: Checked inductivity of 2592 backedges. 0 proven. 2592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:23,074 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:37:23,074 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:37:23,074 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:37:23,075 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:37:23,075 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:37:23,075 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:37:23,090 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:37:23,091 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:37:26,137 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:37:26,137 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:37:26,147 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:37:26,252 INFO L134 CoverageAnalysis]: Checked inductivity of 2592 backedges. 0 proven. 2592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:26,252 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:37:28,007 INFO L134 CoverageAnalysis]: Checked inductivity of 2592 backedges. 0 proven. 2592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:28,029 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:37:28,030 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 77 [2018-11-07 16:37:28,030 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:37:28,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-11-07 16:37:28,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-11-07 16:37:28,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2926, Invalid=2926, Unknown=0, NotChecked=0, Total=5852 [2018-11-07 16:37:28,031 INFO L87 Difference]: Start difference. First operand 159 states and 159 transitions. Second operand 40 states. [2018-11-07 16:37:28,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:37:28,234 INFO L93 Difference]: Finished difference Result 171 states and 171 transitions. [2018-11-07 16:37:28,234 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-11-07 16:37:28,234 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 158 [2018-11-07 16:37:28,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:37:28,236 INFO L225 Difference]: With dead ends: 171 [2018-11-07 16:37:28,236 INFO L226 Difference]: Without dead ends: 165 [2018-11-07 16:37:28,236 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2926, Invalid=2926, Unknown=0, NotChecked=0, Total=5852 [2018-11-07 16:37:28,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2018-11-07 16:37:28,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 163. [2018-11-07 16:37:28,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2018-11-07 16:37:28,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 163 transitions. [2018-11-07 16:37:28,241 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 163 transitions. Word has length 158 [2018-11-07 16:37:28,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:37:28,241 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 163 transitions. [2018-11-07 16:37:28,241 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-11-07 16:37:28,242 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 163 transitions. [2018-11-07 16:37:28,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2018-11-07 16:37:28,242 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:37:28,243 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:37:28,243 INFO L423 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:37:28,243 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:37:28,243 INFO L82 PathProgramCache]: Analyzing trace with hash 173415162, now seen corresponding path program 37 times [2018-11-07 16:37:28,243 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:37:28,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:37:28,244 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:37:28,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:37:28,244 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:37:28,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:37:28,952 INFO L134 CoverageAnalysis]: Checked inductivity of 2738 backedges. 0 proven. 2738 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:28,953 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:37:28,953 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:37:28,953 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:37:28,953 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:37:28,953 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:37:28,953 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:37:28,970 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:37:28,970 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:37:29,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:37:29,017 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:37:29,112 INFO L134 CoverageAnalysis]: Checked inductivity of 2738 backedges. 0 proven. 2738 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:29,112 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:37:30,963 INFO L134 CoverageAnalysis]: Checked inductivity of 2738 backedges. 0 proven. 2738 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:30,982 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:37:30,982 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2018-11-07 16:37:30,982 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:37:30,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-11-07 16:37:30,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-11-07 16:37:30,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-11-07 16:37:30,984 INFO L87 Difference]: Start difference. First operand 163 states and 163 transitions. Second operand 41 states. [2018-11-07 16:37:31,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:37:31,162 INFO L93 Difference]: Finished difference Result 175 states and 175 transitions. [2018-11-07 16:37:31,162 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-11-07 16:37:31,162 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 162 [2018-11-07 16:37:31,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:37:31,164 INFO L225 Difference]: With dead ends: 175 [2018-11-07 16:37:31,164 INFO L226 Difference]: Without dead ends: 169 [2018-11-07 16:37:31,165 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 286 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-11-07 16:37:31,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-11-07 16:37:31,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 167. [2018-11-07 16:37:31,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-11-07 16:37:31,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 167 transitions. [2018-11-07 16:37:31,169 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 167 transitions. Word has length 162 [2018-11-07 16:37:31,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:37:31,170 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 167 transitions. [2018-11-07 16:37:31,170 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-11-07 16:37:31,170 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 167 transitions. [2018-11-07 16:37:31,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2018-11-07 16:37:31,171 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:37:31,171 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:37:31,171 INFO L423 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:37:31,171 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:37:31,172 INFO L82 PathProgramCache]: Analyzing trace with hash -569866989, now seen corresponding path program 38 times [2018-11-07 16:37:31,172 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:37:31,172 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:37:31,172 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:37:31,172 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:37:31,173 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:37:31,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:37:32,509 INFO L134 CoverageAnalysis]: Checked inductivity of 2888 backedges. 0 proven. 2888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:32,509 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:37:32,509 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:37:32,509 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:37:32,509 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:37:32,509 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:37:32,509 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:37:32,518 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:37:32,518 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:37:44,462 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-11-07 16:37:44,463 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:37:44,469 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:37:44,513 INFO L134 CoverageAnalysis]: Checked inductivity of 2888 backedges. 0 proven. 2888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:44,514 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:37:46,584 INFO L134 CoverageAnalysis]: Checked inductivity of 2888 backedges. 0 proven. 2888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:46,605 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:37:46,605 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-11-07 16:37:46,605 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:37:46,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-11-07 16:37:46,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-11-07 16:37:46,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3240, Invalid=3240, Unknown=0, NotChecked=0, Total=6480 [2018-11-07 16:37:46,607 INFO L87 Difference]: Start difference. First operand 167 states and 167 transitions. Second operand 42 states. [2018-11-07 16:37:46,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:37:46,810 INFO L93 Difference]: Finished difference Result 179 states and 179 transitions. [2018-11-07 16:37:46,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-11-07 16:37:46,810 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 166 [2018-11-07 16:37:46,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:37:46,812 INFO L225 Difference]: With dead ends: 179 [2018-11-07 16:37:46,812 INFO L226 Difference]: Without dead ends: 173 [2018-11-07 16:37:46,813 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 293 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3240, Invalid=3240, Unknown=0, NotChecked=0, Total=6480 [2018-11-07 16:37:46,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2018-11-07 16:37:46,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 171. [2018-11-07 16:37:46,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-11-07 16:37:46,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 171 transitions. [2018-11-07 16:37:46,817 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 171 transitions. Word has length 166 [2018-11-07 16:37:46,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:37:46,817 INFO L480 AbstractCegarLoop]: Abstraction has 171 states and 171 transitions. [2018-11-07 16:37:46,817 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-11-07 16:37:46,818 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 171 transitions. [2018-11-07 16:37:46,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-11-07 16:37:46,818 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:37:46,819 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:37:46,819 INFO L423 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:37:46,819 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:37:46,819 INFO L82 PathProgramCache]: Analyzing trace with hash 1607875244, now seen corresponding path program 39 times [2018-11-07 16:37:46,819 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:37:46,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:37:46,820 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:37:46,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:37:46,820 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:37:46,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:37:47,583 INFO L134 CoverageAnalysis]: Checked inductivity of 3042 backedges. 0 proven. 3042 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:47,583 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:37:47,583 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:37:47,584 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:37:47,584 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:37:47,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:37:47,584 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:37:47,596 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:37:47,596 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:37:49,035 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:37:49,035 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:37:49,041 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:37:49,081 INFO L134 CoverageAnalysis]: Checked inductivity of 3042 backedges. 0 proven. 3042 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:49,081 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:37:51,088 INFO L134 CoverageAnalysis]: Checked inductivity of 3042 backedges. 0 proven. 3042 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:51,110 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:37:51,110 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 83 [2018-11-07 16:37:51,111 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:37:51,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-11-07 16:37:51,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-11-07 16:37:51,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3403, Invalid=3403, Unknown=0, NotChecked=0, Total=6806 [2018-11-07 16:37:51,112 INFO L87 Difference]: Start difference. First operand 171 states and 171 transitions. Second operand 43 states. [2018-11-07 16:37:51,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:37:51,287 INFO L93 Difference]: Finished difference Result 183 states and 183 transitions. [2018-11-07 16:37:51,287 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-11-07 16:37:51,287 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 170 [2018-11-07 16:37:51,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:37:51,289 INFO L225 Difference]: With dead ends: 183 [2018-11-07 16:37:51,289 INFO L226 Difference]: Without dead ends: 177 [2018-11-07 16:37:51,290 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 300 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3403, Invalid=3403, Unknown=0, NotChecked=0, Total=6806 [2018-11-07 16:37:51,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-11-07 16:37:51,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 175. [2018-11-07 16:37:51,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-11-07 16:37:51,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 175 transitions. [2018-11-07 16:37:51,293 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 175 transitions. Word has length 170 [2018-11-07 16:37:51,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:37:51,294 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 175 transitions. [2018-11-07 16:37:51,294 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-11-07 16:37:51,294 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 175 transitions. [2018-11-07 16:37:51,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-11-07 16:37:51,295 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:37:51,295 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:37:51,295 INFO L423 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:37:51,295 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:37:51,296 INFO L82 PathProgramCache]: Analyzing trace with hash 841841605, now seen corresponding path program 40 times [2018-11-07 16:37:51,296 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:37:51,296 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:37:51,296 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:37:51,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:37:51,297 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:37:51,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:37:52,093 INFO L134 CoverageAnalysis]: Checked inductivity of 3200 backedges. 0 proven. 3200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:52,093 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:37:52,093 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:37:52,093 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:37:52,094 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:37:52,094 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:37:52,094 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:37:52,102 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:37:52,102 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:37:52,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:37:52,143 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:37:52,179 INFO L134 CoverageAnalysis]: Checked inductivity of 3200 backedges. 0 proven. 3200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:52,179 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:37:53,913 INFO L134 CoverageAnalysis]: Checked inductivity of 3200 backedges. 0 proven. 3200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:53,932 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:37:53,932 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 85 [2018-11-07 16:37:53,933 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:37:53,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-11-07 16:37:53,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-11-07 16:37:53,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3570, Invalid=3570, Unknown=0, NotChecked=0, Total=7140 [2018-11-07 16:37:53,934 INFO L87 Difference]: Start difference. First operand 175 states and 175 transitions. Second operand 44 states. [2018-11-07 16:37:54,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:37:54,133 INFO L93 Difference]: Finished difference Result 187 states and 187 transitions. [2018-11-07 16:37:54,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-11-07 16:37:54,133 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 174 [2018-11-07 16:37:54,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:37:54,134 INFO L225 Difference]: With dead ends: 187 [2018-11-07 16:37:54,134 INFO L226 Difference]: Without dead ends: 181 [2018-11-07 16:37:54,135 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 307 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3570, Invalid=3570, Unknown=0, NotChecked=0, Total=7140 [2018-11-07 16:37:54,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-11-07 16:37:54,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 179. [2018-11-07 16:37:54,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2018-11-07 16:37:54,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 179 transitions. [2018-11-07 16:37:54,138 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 179 transitions. Word has length 174 [2018-11-07 16:37:54,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:37:54,139 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 179 transitions. [2018-11-07 16:37:54,139 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-11-07 16:37:54,139 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 179 transitions. [2018-11-07 16:37:54,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2018-11-07 16:37:54,140 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:37:54,140 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:37:54,140 INFO L423 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:37:54,140 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:37:54,140 INFO L82 PathProgramCache]: Analyzing trace with hash -1772320674, now seen corresponding path program 41 times [2018-11-07 16:37:54,140 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:37:54,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:37:54,141 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:37:54,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:37:54,141 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:37:54,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:37:55,162 INFO L134 CoverageAnalysis]: Checked inductivity of 3362 backedges. 0 proven. 3362 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:37:55,163 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:37:55,163 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:37:55,163 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:37:55,163 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:37:55,163 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:37:55,163 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:37:55,172 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:37:55,172 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:38:23,865 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-11-07 16:38:23,865 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:23,875 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:23,918 INFO L134 CoverageAnalysis]: Checked inductivity of 3362 backedges. 0 proven. 3362 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:23,918 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:26,080 INFO L134 CoverageAnalysis]: Checked inductivity of 3362 backedges. 0 proven. 3362 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:26,104 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:26,105 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2018-11-07 16:38:26,105 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:26,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-11-07 16:38:26,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-11-07 16:38:26,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3741, Invalid=3741, Unknown=0, NotChecked=0, Total=7482 [2018-11-07 16:38:26,106 INFO L87 Difference]: Start difference. First operand 179 states and 179 transitions. Second operand 45 states. [2018-11-07 16:38:26,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:26,297 INFO L93 Difference]: Finished difference Result 191 states and 191 transitions. [2018-11-07 16:38:26,299 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-11-07 16:38:26,299 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 178 [2018-11-07 16:38:26,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:26,301 INFO L225 Difference]: With dead ends: 191 [2018-11-07 16:38:26,301 INFO L226 Difference]: Without dead ends: 185 [2018-11-07 16:38:26,301 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 314 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3741, Invalid=3741, Unknown=0, NotChecked=0, Total=7482 [2018-11-07 16:38:26,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2018-11-07 16:38:26,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 183. [2018-11-07 16:38:26,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-11-07 16:38:26,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 183 transitions. [2018-11-07 16:38:26,305 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 183 transitions. Word has length 178 [2018-11-07 16:38:26,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:26,306 INFO L480 AbstractCegarLoop]: Abstraction has 183 states and 183 transitions. [2018-11-07 16:38:26,306 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-11-07 16:38:26,306 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 183 transitions. [2018-11-07 16:38:26,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-11-07 16:38:26,307 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:26,307 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:26,307 INFO L423 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:26,307 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:26,308 INFO L82 PathProgramCache]: Analyzing trace with hash -57565065, now seen corresponding path program 42 times [2018-11-07 16:38:26,308 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:26,308 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:26,309 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:26,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:26,309 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:26,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:27,207 INFO L134 CoverageAnalysis]: Checked inductivity of 3528 backedges. 0 proven. 3528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:27,207 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:27,207 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:27,207 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:27,207 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:27,207 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:27,207 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:38:27,217 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:38:27,217 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:38:29,586 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:38:29,586 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:29,595 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:29,711 INFO L134 CoverageAnalysis]: Checked inductivity of 3528 backedges. 0 proven. 3528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:29,711 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:32,030 INFO L134 CoverageAnalysis]: Checked inductivity of 3528 backedges. 0 proven. 3528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:32,052 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:32,053 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 89 [2018-11-07 16:38:32,053 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:32,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-11-07 16:38:32,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-11-07 16:38:32,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3916, Invalid=3916, Unknown=0, NotChecked=0, Total=7832 [2018-11-07 16:38:32,054 INFO L87 Difference]: Start difference. First operand 183 states and 183 transitions. Second operand 46 states. [2018-11-07 16:38:32,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:32,277 INFO L93 Difference]: Finished difference Result 195 states and 195 transitions. [2018-11-07 16:38:32,277 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-11-07 16:38:32,277 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 182 [2018-11-07 16:38:32,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:32,278 INFO L225 Difference]: With dead ends: 195 [2018-11-07 16:38:32,278 INFO L226 Difference]: Without dead ends: 189 [2018-11-07 16:38:32,279 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 321 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3916, Invalid=3916, Unknown=0, NotChecked=0, Total=7832 [2018-11-07 16:38:32,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2018-11-07 16:38:32,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 187. [2018-11-07 16:38:32,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-11-07 16:38:32,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 187 transitions. [2018-11-07 16:38:32,283 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 187 transitions. Word has length 182 [2018-11-07 16:38:32,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:32,283 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 187 transitions. [2018-11-07 16:38:32,283 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-11-07 16:38:32,283 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 187 transitions. [2018-11-07 16:38:32,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-11-07 16:38:32,284 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:32,284 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:32,284 INFO L423 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:32,284 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:32,284 INFO L82 PathProgramCache]: Analyzing trace with hash -1814363120, now seen corresponding path program 43 times [2018-11-07 16:38:32,285 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:32,285 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:32,285 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:32,285 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:32,285 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:32,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:33,639 INFO L134 CoverageAnalysis]: Checked inductivity of 3698 backedges. 0 proven. 3698 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:33,639 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:33,639 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:33,639 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:33,639 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:33,639 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:33,639 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:38:33,649 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:33,649 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:38:33,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:33,690 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:33,730 INFO L134 CoverageAnalysis]: Checked inductivity of 3698 backedges. 0 proven. 3698 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:33,731 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:35,749 INFO L134 CoverageAnalysis]: Checked inductivity of 3698 backedges. 0 proven. 3698 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:35,768 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:35,768 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 91 [2018-11-07 16:38:35,768 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:35,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-11-07 16:38:35,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-11-07 16:38:35,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4095, Invalid=4095, Unknown=0, NotChecked=0, Total=8190 [2018-11-07 16:38:35,770 INFO L87 Difference]: Start difference. First operand 187 states and 187 transitions. Second operand 47 states. [2018-11-07 16:38:36,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:36,054 INFO L93 Difference]: Finished difference Result 199 states and 199 transitions. [2018-11-07 16:38:36,055 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-11-07 16:38:36,055 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 186 [2018-11-07 16:38:36,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:36,056 INFO L225 Difference]: With dead ends: 199 [2018-11-07 16:38:36,056 INFO L226 Difference]: Without dead ends: 193 [2018-11-07 16:38:36,057 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 328 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=4095, Invalid=4095, Unknown=0, NotChecked=0, Total=8190 [2018-11-07 16:38:36,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-11-07 16:38:36,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 191. [2018-11-07 16:38:36,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 191 states. [2018-11-07 16:38:36,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 191 transitions. [2018-11-07 16:38:36,060 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 191 transitions. Word has length 186 [2018-11-07 16:38:36,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:36,061 INFO L480 AbstractCegarLoop]: Abstraction has 191 states and 191 transitions. [2018-11-07 16:38:36,061 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-11-07 16:38:36,061 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 191 transitions. [2018-11-07 16:38:36,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2018-11-07 16:38:36,061 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:36,062 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:36,062 INFO L423 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:36,062 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:36,062 INFO L82 PathProgramCache]: Analyzing trace with hash -634981591, now seen corresponding path program 44 times [2018-11-07 16:38:36,062 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:36,062 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:36,063 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:36,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:36,063 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:36,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:36,949 INFO L134 CoverageAnalysis]: Checked inductivity of 3872 backedges. 0 proven. 3872 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:36,949 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:36,949 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:36,949 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:36,950 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:36,950 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:36,950 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:38:36,959 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:38:36,959 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:39:09,671 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-11-07 16:39:09,671 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:39:09,683 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:39:09,727 INFO L134 CoverageAnalysis]: Checked inductivity of 3872 backedges. 0 proven. 3872 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:09,727 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:39:12,443 INFO L134 CoverageAnalysis]: Checked inductivity of 3872 backedges. 0 proven. 3872 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:12,467 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:39:12,467 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-11-07 16:39:12,467 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:39:12,468 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-11-07 16:39:12,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-11-07 16:39:12,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4278, Invalid=4278, Unknown=0, NotChecked=0, Total=8556 [2018-11-07 16:39:12,469 INFO L87 Difference]: Start difference. First operand 191 states and 191 transitions. Second operand 48 states. [2018-11-07 16:39:12,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:39:12,673 INFO L93 Difference]: Finished difference Result 203 states and 203 transitions. [2018-11-07 16:39:12,673 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-11-07 16:39:12,673 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 190 [2018-11-07 16:39:12,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:39:12,675 INFO L225 Difference]: With dead ends: 203 [2018-11-07 16:39:12,675 INFO L226 Difference]: Without dead ends: 197 [2018-11-07 16:39:12,675 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 335 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4278, Invalid=4278, Unknown=0, NotChecked=0, Total=8556 [2018-11-07 16:39:12,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-11-07 16:39:12,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 195. [2018-11-07 16:39:12,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2018-11-07 16:39:12,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 195 transitions. [2018-11-07 16:39:12,680 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 195 transitions. Word has length 190 [2018-11-07 16:39:12,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:39:12,680 INFO L480 AbstractCegarLoop]: Abstraction has 195 states and 195 transitions. [2018-11-07 16:39:12,680 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-11-07 16:39:12,680 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 195 transitions. [2018-11-07 16:39:12,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-11-07 16:39:12,681 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:39:12,681 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:39:12,681 INFO L423 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:39:12,681 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:39:12,681 INFO L82 PathProgramCache]: Analyzing trace with hash 742632898, now seen corresponding path program 45 times [2018-11-07 16:39:12,682 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:39:12,682 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:12,682 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:39:12,682 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:12,682 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:39:12,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:39:13,568 INFO L134 CoverageAnalysis]: Checked inductivity of 4050 backedges. 0 proven. 4050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:13,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:13,569 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:39:13,569 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:39:13,569 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:39:13,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:13,569 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:39:13,580 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:39:13,580 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:39:16,819 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:39:16,819 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:39:16,829 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:39:16,981 INFO L134 CoverageAnalysis]: Checked inductivity of 4050 backedges. 0 proven. 4050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:16,982 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:39:19,423 INFO L134 CoverageAnalysis]: Checked inductivity of 4050 backedges. 0 proven. 4050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:19,447 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:39:19,447 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 95 [2018-11-07 16:39:19,447 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:39:19,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-11-07 16:39:19,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-11-07 16:39:19,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4465, Invalid=4465, Unknown=0, NotChecked=0, Total=8930 [2018-11-07 16:39:19,449 INFO L87 Difference]: Start difference. First operand 195 states and 195 transitions. Second operand 49 states. [2018-11-07 16:39:19,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:39:19,659 INFO L93 Difference]: Finished difference Result 207 states and 207 transitions. [2018-11-07 16:39:19,660 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-11-07 16:39:19,660 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 194 [2018-11-07 16:39:19,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:39:19,661 INFO L225 Difference]: With dead ends: 207 [2018-11-07 16:39:19,661 INFO L226 Difference]: Without dead ends: 201 [2018-11-07 16:39:19,661 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=4465, Invalid=4465, Unknown=0, NotChecked=0, Total=8930 [2018-11-07 16:39:19,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2018-11-07 16:39:19,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 199. [2018-11-07 16:39:19,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2018-11-07 16:39:19,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 199 transitions. [2018-11-07 16:39:19,665 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 199 transitions. Word has length 194 [2018-11-07 16:39:19,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:39:19,665 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 199 transitions. [2018-11-07 16:39:19,665 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-11-07 16:39:19,665 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 199 transitions. [2018-11-07 16:39:19,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2018-11-07 16:39:19,666 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:39:19,666 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:39:19,666 INFO L423 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:39:19,667 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:39:19,667 INFO L82 PathProgramCache]: Analyzing trace with hash 1440707547, now seen corresponding path program 46 times [2018-11-07 16:39:19,667 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:39:19,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:19,667 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:39:19,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:19,668 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:39:19,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:39:20,589 INFO L134 CoverageAnalysis]: Checked inductivity of 4232 backedges. 0 proven. 4232 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:20,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:20,589 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:39:20,589 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:39:20,589 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:39:20,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:20,590 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:39:20,599 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:39:20,599 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:39:20,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:39:20,645 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:39:20,681 INFO L134 CoverageAnalysis]: Checked inductivity of 4232 backedges. 0 proven. 4232 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:20,681 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:39:23,261 INFO L134 CoverageAnalysis]: Checked inductivity of 4232 backedges. 0 proven. 4232 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:23,280 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:39:23,280 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2018-11-07 16:39:23,280 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:39:23,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-11-07 16:39:23,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-11-07 16:39:23,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4656, Invalid=4656, Unknown=0, NotChecked=0, Total=9312 [2018-11-07 16:39:23,281 INFO L87 Difference]: Start difference. First operand 199 states and 199 transitions. Second operand 50 states. [2018-11-07 16:39:23,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:39:23,491 INFO L93 Difference]: Finished difference Result 211 states and 211 transitions. [2018-11-07 16:39:23,492 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-11-07 16:39:23,492 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 198 [2018-11-07 16:39:23,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:39:23,494 INFO L225 Difference]: With dead ends: 211 [2018-11-07 16:39:23,494 INFO L226 Difference]: Without dead ends: 205 [2018-11-07 16:39:23,495 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 349 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4656, Invalid=4656, Unknown=0, NotChecked=0, Total=9312 [2018-11-07 16:39:23,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-11-07 16:39:23,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 203. [2018-11-07 16:39:23,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 203 states. [2018-11-07 16:39:23,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 203 transitions. [2018-11-07 16:39:23,499 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 203 transitions. Word has length 198 [2018-11-07 16:39:23,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:39:23,499 INFO L480 AbstractCegarLoop]: Abstraction has 203 states and 203 transitions. [2018-11-07 16:39:23,499 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-11-07 16:39:23,499 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 203 transitions. [2018-11-07 16:39:23,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2018-11-07 16:39:23,500 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:39:23,501 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:39:23,501 INFO L423 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:39:23,501 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:39:23,501 INFO L82 PathProgramCache]: Analyzing trace with hash 562595188, now seen corresponding path program 47 times [2018-11-07 16:39:23,501 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:39:23,502 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:23,502 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:39:23,502 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:23,502 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:39:23,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:39:24,519 INFO L134 CoverageAnalysis]: Checked inductivity of 4418 backedges. 0 proven. 4418 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:24,519 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:24,520 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:39:24,520 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:39:24,520 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:39:24,520 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:24,520 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:39:24,529 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:39:24,529 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:40:01,254 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-11-07 16:40:01,255 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:40:01,264 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:40:01,398 INFO L134 CoverageAnalysis]: Checked inductivity of 4418 backedges. 0 proven. 4418 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:40:01,398 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:40:04,060 INFO L134 CoverageAnalysis]: Checked inductivity of 4418 backedges. 0 proven. 4418 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:40:04,084 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:40:04,084 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 99 [2018-11-07 16:40:04,084 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:40:04,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-11-07 16:40:04,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-11-07 16:40:04,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4851, Invalid=4851, Unknown=0, NotChecked=0, Total=9702 [2018-11-07 16:40:04,085 INFO L87 Difference]: Start difference. First operand 203 states and 203 transitions. Second operand 51 states. [2018-11-07 16:40:04,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:40:04,321 INFO L93 Difference]: Finished difference Result 215 states and 215 transitions. [2018-11-07 16:40:04,321 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-11-07 16:40:04,321 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 202 [2018-11-07 16:40:04,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:40:04,322 INFO L225 Difference]: With dead ends: 215 [2018-11-07 16:40:04,322 INFO L226 Difference]: Without dead ends: 209 [2018-11-07 16:40:04,323 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 356 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4851, Invalid=4851, Unknown=0, NotChecked=0, Total=9702 [2018-11-07 16:40:04,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2018-11-07 16:40:04,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 207. [2018-11-07 16:40:04,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-11-07 16:40:04,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 207 transitions. [2018-11-07 16:40:04,327 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 207 transitions. Word has length 202 [2018-11-07 16:40:04,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:40:04,328 INFO L480 AbstractCegarLoop]: Abstraction has 207 states and 207 transitions. [2018-11-07 16:40:04,328 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-11-07 16:40:04,328 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 207 transitions. [2018-11-07 16:40:04,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-11-07 16:40:04,329 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:40:04,329 INFO L375 BasicCegarLoop]: trace histogram [49, 48, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:40:04,329 INFO L423 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:40:04,330 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:40:04,330 INFO L82 PathProgramCache]: Analyzing trace with hash -391306611, now seen corresponding path program 48 times [2018-11-07 16:40:04,330 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:40:04,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:04,331 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:40:04,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:04,331 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:40:04,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:05,463 INFO L134 CoverageAnalysis]: Checked inductivity of 4608 backedges. 0 proven. 4608 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:40:05,463 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:05,463 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:40:05,464 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:40:05,464 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:40:05,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:05,464 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:40:05,471 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:40:05,471 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:40:08,532 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:40:08,532 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:40:08,542 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:40:08,582 INFO L134 CoverageAnalysis]: Checked inductivity of 4608 backedges. 0 proven. 4608 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:40:08,582 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:40:11,275 INFO L134 CoverageAnalysis]: Checked inductivity of 4608 backedges. 0 proven. 4608 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:40:11,300 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:40:11,301 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 101 [2018-11-07 16:40:11,301 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:40:11,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-11-07 16:40:11,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-11-07 16:40:11,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5050, Invalid=5050, Unknown=0, NotChecked=0, Total=10100 [2018-11-07 16:40:11,303 INFO L87 Difference]: Start difference. First operand 207 states and 207 transitions. Second operand 52 states. [2018-11-07 16:40:11,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:40:11,527 INFO L93 Difference]: Finished difference Result 219 states and 219 transitions. [2018-11-07 16:40:11,527 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-11-07 16:40:11,527 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 206 [2018-11-07 16:40:11,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:40:11,529 INFO L225 Difference]: With dead ends: 219 [2018-11-07 16:40:11,529 INFO L226 Difference]: Without dead ends: 213 [2018-11-07 16:40:11,530 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 363 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=5050, Invalid=5050, Unknown=0, NotChecked=0, Total=10100 [2018-11-07 16:40:11,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2018-11-07 16:40:11,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 211. [2018-11-07 16:40:11,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 211 states. [2018-11-07 16:40:11,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 211 transitions. [2018-11-07 16:40:11,535 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 211 transitions. Word has length 206 [2018-11-07 16:40:11,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:40:11,535 INFO L480 AbstractCegarLoop]: Abstraction has 211 states and 211 transitions. [2018-11-07 16:40:11,536 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-11-07 16:40:11,536 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 211 transitions. [2018-11-07 16:40:11,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2018-11-07 16:40:11,537 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:40:11,537 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:40:11,537 INFO L423 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:40:11,537 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:40:11,537 INFO L82 PathProgramCache]: Analyzing trace with hash 597396262, now seen corresponding path program 49 times [2018-11-07 16:40:11,538 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:40:11,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:11,538 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:40:11,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:11,538 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:40:11,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:13,402 INFO L134 CoverageAnalysis]: Checked inductivity of 4802 backedges. 0 proven. 4802 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:40:13,402 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:13,402 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:40:13,403 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:40:13,403 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:40:13,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:13,403 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:40:13,411 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:40:13,411 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:40:13,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:13,458 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:40:13,540 INFO L134 CoverageAnalysis]: Checked inductivity of 4802 backedges. 0 proven. 4802 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:40:13,540 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:40:16,128 INFO L134 CoverageAnalysis]: Checked inductivity of 4802 backedges. 0 proven. 4802 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:40:16,148 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:40:16,148 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 103 [2018-11-07 16:40:16,148 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:40:16,149 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-11-07 16:40:16,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-11-07 16:40:16,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5253, Invalid=5253, Unknown=0, NotChecked=0, Total=10506 [2018-11-07 16:40:16,149 INFO L87 Difference]: Start difference. First operand 211 states and 211 transitions. Second operand 53 states. [2018-11-07 16:40:16,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:40:16,410 INFO L93 Difference]: Finished difference Result 223 states and 223 transitions. [2018-11-07 16:40:16,410 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-11-07 16:40:16,410 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 210 [2018-11-07 16:40:16,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:40:16,415 INFO L225 Difference]: With dead ends: 223 [2018-11-07 16:40:16,415 INFO L226 Difference]: Without dead ends: 217 [2018-11-07 16:40:16,416 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 370 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=5253, Invalid=5253, Unknown=0, NotChecked=0, Total=10506 [2018-11-07 16:40:16,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2018-11-07 16:40:16,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 215. [2018-11-07 16:40:16,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2018-11-07 16:40:16,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 215 transitions. [2018-11-07 16:40:16,420 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 215 transitions. Word has length 210 [2018-11-07 16:40:16,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:40:16,420 INFO L480 AbstractCegarLoop]: Abstraction has 215 states and 215 transitions. [2018-11-07 16:40:16,420 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-11-07 16:40:16,420 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 215 transitions. [2018-11-07 16:40:16,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2018-11-07 16:40:16,421 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:40:16,422 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:40:16,422 INFO L423 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:40:16,422 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:40:16,422 INFO L82 PathProgramCache]: Analyzing trace with hash -108921025, now seen corresponding path program 50 times [2018-11-07 16:40:16,422 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:40:16,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:16,423 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:40:16,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:16,423 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:40:16,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:17,626 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 0 proven. 5000 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:40:17,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:17,627 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:40:17,627 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:40:17,627 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:40:17,627 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:17,627 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:40:17,636 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:40:17,636 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown