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/diamond_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 16:38:02,902 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 16:38:02,904 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 16:38:02,918 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 16:38:02,919 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 16:38:02,920 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 16:38:02,921 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 16:38:02,923 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 16:38:02,924 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 16:38:02,925 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 16:38:02,926 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 16:38:02,926 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 16:38:02,927 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 16:38:02,928 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 16:38:02,931 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 16:38:02,932 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 16:38:02,933 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 16:38:02,940 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 16:38:02,942 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 16:38:02,946 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 16:38:02,950 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 16:38:02,951 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 16:38:02,953 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 16:38:02,954 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 16:38:02,954 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 16:38:02,955 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 16:38:02,956 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 16:38:02,956 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 16:38:02,957 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 16:38:02,958 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 16:38:02,958 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 16:38:02,959 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-07 16:38:02,959 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-07 16:38:02,960 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-07 16:38:02,960 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-07 16:38:02,961 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-07 16:38:02,961 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 16:38:02,976 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 16:38:02,976 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 16:38:02,977 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 16:38:02,977 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 16:38:02,978 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 16:38:02,978 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 16:38:02,978 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 16:38:02,978 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 16:38:02,978 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 16:38:02,979 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 16:38:02,979 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 16:38:02,979 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 16:38:02,980 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 16:38:02,980 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 16:38:02,980 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 16:38:02,980 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 16:38:02,980 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 16:38:02,981 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 16:38:02,981 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 16:38:02,981 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 16:38:02,981 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 16:38:02,981 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 16:38:02,982 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 16:38:02,982 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 16:38:02,982 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 16:38:02,982 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 16:38:02,982 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 16:38:02,983 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 16:38:02,983 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 16:38:02,983 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 16:38:02,983 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 16:38:02,983 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 16:38:02,984 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 16:38:02,984 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 16:38:03,031 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 16:38:03,045 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 16:38:03,049 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 16:38:03,051 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 16:38:03,051 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 16:38:03,052 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/diamond_false-unreach-call1.i [2018-11-07 16:38:03,119 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c1bd48c4/0d8b01667669476fb897f5783b9e6f2a/FLAG3d5da5623 [2018-11-07 16:38:03,597 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 16:38:03,598 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/diamond_false-unreach-call1.i [2018-11-07 16:38:03,604 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c1bd48c4/0d8b01667669476fb897f5783b9e6f2a/FLAG3d5da5623 [2018-11-07 16:38:03,624 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c1bd48c4/0d8b01667669476fb897f5783b9e6f2a [2018-11-07 16:38:03,640 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 16:38:03,642 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 16:38:03,643 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 16:38:03,643 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 16:38:03,647 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 16:38:03,648 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:38:03" (1/1) ... [2018-11-07 16:38:03,651 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7aebaabf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:38:03, skipping insertion in model container [2018-11-07 16:38:03,651 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:38:03" (1/1) ... [2018-11-07 16:38:03,662 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 16:38:03,683 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 16:38:03,885 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 16:38:03,889 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 16:38:03,907 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 16:38:03,923 INFO L193 MainTranslator]: Completed translation [2018-11-07 16:38:03,924 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:38:03 WrapperNode [2018-11-07 16:38:03,924 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 16:38:03,925 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 16:38:03,925 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 16:38:03,925 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 16:38:03,934 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:38:03" (1/1) ... [2018-11-07 16:38:03,939 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:38:03" (1/1) ... [2018-11-07 16:38:03,945 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 16:38:03,946 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 16:38:03,946 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 16:38:03,946 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 16:38:03,954 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:38:03" (1/1) ... [2018-11-07 16:38:03,955 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:38:03" (1/1) ... [2018-11-07 16:38:03,955 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:38:03" (1/1) ... [2018-11-07 16:38:03,955 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:38:03" (1/1) ... [2018-11-07 16:38:03,959 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:38:03" (1/1) ... [2018-11-07 16:38:03,964 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:38:03" (1/1) ... [2018-11-07 16:38:03,965 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:38:03" (1/1) ... [2018-11-07 16:38:03,966 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 16:38:03,967 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 16:38:03,967 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 16:38:03,967 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 16:38:03,968 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:38:03" (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 16:38:04,090 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 16:38:04,090 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 16:38:04,090 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 16:38:04,091 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 16:38:04,091 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 16:38:04,091 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 16:38:04,091 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 16:38:04,091 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 16:38:04,292 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 16:38:04,292 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:38:04 BoogieIcfgContainer [2018-11-07 16:38:04,293 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 16:38:04,294 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 16:38:04,294 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 16:38:04,297 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 16:38:04,298 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 04:38:03" (1/3) ... [2018-11-07 16:38:04,299 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a27e85 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:38:04, skipping insertion in model container [2018-11-07 16:38:04,299 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:38:03" (2/3) ... [2018-11-07 16:38:04,299 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a27e85 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:38:04, skipping insertion in model container [2018-11-07 16:38:04,299 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:38:04" (3/3) ... [2018-11-07 16:38:04,301 INFO L112 eAbstractionObserver]: Analyzing ICFG diamond_false-unreach-call1.i [2018-11-07 16:38:04,312 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 16:38:04,321 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 16:38:04,337 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 16:38:04,377 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 16:38:04,377 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 16:38:04,378 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 16:38:04,378 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 16:38:04,379 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 16:38:04,379 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 16:38:04,379 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 16:38:04,379 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 16:38:04,398 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-11-07 16:38:04,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-07 16:38:04,407 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:04,408 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:04,410 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:04,416 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:04,416 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-11-07 16:38:04,418 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:04,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:04,466 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:04,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:04,466 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:04,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:04,518 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 16:38:04,520 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 16:38:04,520 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 16:38:04,520 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 16:38:04,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 16:38:04,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 16:38:04,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 16:38:04,541 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-11-07 16:38:04,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:04,564 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-11-07 16:38:04,565 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 16:38:04,566 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-11-07 16:38:04,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:04,575 INFO L225 Difference]: With dead ends: 30 [2018-11-07 16:38:04,575 INFO L226 Difference]: Without dead ends: 13 [2018-11-07 16:38:04,579 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 16:38:04,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-11-07 16:38:04,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-11-07 16:38:04,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-11-07 16:38:04,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-11-07 16:38:04,625 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-11-07 16:38:04,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:04,626 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-11-07 16:38:04,626 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 16:38:04,626 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-11-07 16:38:04,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-07 16:38:04,627 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:04,627 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:04,628 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:04,628 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:04,628 INFO L82 PathProgramCache]: Analyzing trace with hash 1144102878, now seen corresponding path program 1 times [2018-11-07 16:38:04,628 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:04,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:04,630 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:04,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:04,630 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:04,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:04,839 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2018-11-07 16:38:04,858 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 16:38:04,859 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 16:38:04,859 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-07 16:38:04,859 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 16:38:04,861 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 16:38:04,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 16:38:04,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 16:38:04,862 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-11-07 16:38:04,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:04,958 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2018-11-07 16:38:04,959 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 16:38:04,959 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-11-07 16:38:04,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:04,962 INFO L225 Difference]: With dead ends: 21 [2018-11-07 16:38:04,962 INFO L226 Difference]: Without dead ends: 16 [2018-11-07 16:38:04,963 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 16:38:04,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-11-07 16:38:04,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-11-07 16:38:04,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-11-07 16:38:04,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-11-07 16:38:04,974 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2018-11-07 16:38:04,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:04,975 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-11-07 16:38:04,975 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 16:38:04,975 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-11-07 16:38:04,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-11-07 16:38:04,976 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:04,976 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:04,977 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:04,977 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:04,977 INFO L82 PathProgramCache]: Analyzing trace with hash -2056921797, now seen corresponding path program 1 times [2018-11-07 16:38:04,977 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:04,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:04,979 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:04,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:04,979 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:05,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:05,132 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 16:38:05,132 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:05,132 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:05,133 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-11-07 16:38:05,135 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [26], [29], [31], [37], [38], [39], [41] [2018-11-07 16:38:05,174 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 16:38:05,174 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 16:38:05,269 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 16:38:05,729 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 16:38:05,731 INFO L272 AbstractInterpreter]: Visited 13 different actions 61 times. Merged at 4 different actions 26 times. Widened at 1 different actions 3 times. Found 1 fixpoints after 1 different actions. Largest state had 4 variables. [2018-11-07 16:38:05,782 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:05,786 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 16:38:05,786 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:05,786 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 16:38:05,806 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:05,806 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:38:05,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:05,856 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:05,944 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 16:38:05,944 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:06,228 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 16:38:06,266 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:06,266 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-11-07 16:38:06,268 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:06,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-07 16:38:06,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-07 16:38:06,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-11-07 16:38:06,269 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 4 states. [2018-11-07 16:38:06,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:06,519 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2018-11-07 16:38:06,521 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-07 16:38:06,521 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-11-07 16:38:06,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:06,523 INFO L225 Difference]: With dead ends: 24 [2018-11-07 16:38:06,524 INFO L226 Difference]: Without dead ends: 19 [2018-11-07 16:38:06,524 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-11-07 16:38:06,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-11-07 16:38:06,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2018-11-07 16:38:06,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-11-07 16:38:06,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2018-11-07 16:38:06,533 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2018-11-07 16:38:06,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:06,533 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2018-11-07 16:38:06,533 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-07 16:38:06,533 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2018-11-07 16:38:06,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-11-07 16:38:06,536 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:06,536 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:06,536 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:06,537 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:06,537 INFO L82 PathProgramCache]: Analyzing trace with hash -281914435, now seen corresponding path program 1 times [2018-11-07 16:38:06,537 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:06,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:06,538 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:06,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:06,539 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:06,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:06,694 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 16:38:06,694 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:06,694 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:06,695 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-11-07 16:38:06,695 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [19], [26], [29], [31], [37], [38], [39], [41] [2018-11-07 16:38:06,697 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 16:38:06,697 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 16:38:06,702 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 16:38:07,130 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 16:38:07,131 INFO L272 AbstractInterpreter]: Visited 13 different actions 61 times. Merged at 4 different actions 26 times. Widened at 1 different actions 3 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-11-07 16:38:07,167 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:07,167 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 16:38:07,168 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:07,168 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 16:38:07,182 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:07,182 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:38:07,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:07,210 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:07,279 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 16:38:07,280 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:07,551 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 16:38:07,587 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:07,588 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-11-07 16:38:07,588 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:07,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-07 16:38:07,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-07 16:38:07,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-11-07 16:38:07,589 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 4 states. [2018-11-07 16:38:07,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:07,858 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2018-11-07 16:38:07,860 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-07 16:38:07,860 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-11-07 16:38:07,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:07,861 INFO L225 Difference]: With dead ends: 26 [2018-11-07 16:38:07,861 INFO L226 Difference]: Without dead ends: 21 [2018-11-07 16:38:07,863 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-11-07 16:38:07,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-11-07 16:38:07,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2018-11-07 16:38:07,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-11-07 16:38:07,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2018-11-07 16:38:07,871 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2018-11-07 16:38:07,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:07,872 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2018-11-07 16:38:07,872 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-07 16:38:07,872 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2018-11-07 16:38:07,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-11-07 16:38:07,875 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:07,875 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:07,875 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:07,875 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:07,876 INFO L82 PathProgramCache]: Analyzing trace with hash 1670825662, now seen corresponding path program 2 times [2018-11-07 16:38:07,877 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:07,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:07,878 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:07,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:07,878 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:07,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:08,358 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:08,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:08,359 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:08,359 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:08,359 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:08,359 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:08,359 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 16:38:08,379 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:38:08,379 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:38:08,431 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 16:38:08,432 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:08,434 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:08,499 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:08,499 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:08,751 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:08,778 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:08,778 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-11-07 16:38:08,779 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:08,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-07 16:38:08,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-07 16:38:08,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-11-07 16:38:08,780 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2018-11-07 16:38:08,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:08,915 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2018-11-07 16:38:08,916 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 16:38:08,916 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-11-07 16:38:08,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:08,918 INFO L225 Difference]: With dead ends: 29 [2018-11-07 16:38:08,918 INFO L226 Difference]: Without dead ends: 24 [2018-11-07 16:38:08,919 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-11-07 16:38:08,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-11-07 16:38:08,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2018-11-07 16:38:08,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-07 16:38:08,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2018-11-07 16:38:08,924 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 17 [2018-11-07 16:38:08,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:08,925 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2018-11-07 16:38:08,925 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-07 16:38:08,925 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2018-11-07 16:38:08,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-11-07 16:38:08,926 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:08,926 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:08,926 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:08,926 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:08,927 INFO L82 PathProgramCache]: Analyzing trace with hash -849134272, now seen corresponding path program 1 times [2018-11-07 16:38:08,927 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:08,928 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:08,928 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:08,928 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:08,928 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:08,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:09,051 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:09,052 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:09,052 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:09,052 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 18 with the following transitions: [2018-11-07 16:38:09,053 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-11-07 16:38:09,054 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 16:38:09,054 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 16:38:09,059 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 16:38:09,344 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 16:38:09,344 INFO L272 AbstractInterpreter]: Visited 14 different actions 69 times. Merged at 5 different actions 26 times. Widened at 2 different actions 3 times. Found 9 fixpoints after 2 different actions. Largest state had 4 variables. [2018-11-07 16:38:09,382 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:09,382 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 16:38:09,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:09,382 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 16:38:09,401 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:09,401 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:38:09,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:09,427 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:09,561 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:09,561 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:09,597 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:09,621 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-11-07 16:38:09,621 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 6 [2018-11-07 16:38:09,621 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 16:38:09,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 16:38:09,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 16:38:09,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-11-07 16:38:09,622 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand 3 states. [2018-11-07 16:38:09,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:09,637 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2018-11-07 16:38:09,638 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 16:38:09,638 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-11-07 16:38:09,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:09,640 INFO L225 Difference]: With dead ends: 35 [2018-11-07 16:38:09,640 INFO L226 Difference]: Without dead ends: 27 [2018-11-07 16:38:09,641 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-11-07 16:38:09,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-11-07 16:38:09,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-11-07 16:38:09,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-11-07 16:38:09,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2018-11-07 16:38:09,647 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 17 [2018-11-07 16:38:09,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:09,647 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2018-11-07 16:38:09,648 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 16:38:09,648 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2018-11-07 16:38:09,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-11-07 16:38:09,649 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:09,649 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:09,649 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:09,649 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:09,649 INFO L82 PathProgramCache]: Analyzing trace with hash 1277798652, now seen corresponding path program 2 times [2018-11-07 16:38:09,650 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:09,650 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:09,651 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:09,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:09,651 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:09,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:09,851 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:09,851 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:09,851 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:09,852 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:09,852 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:09,852 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:09,852 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 16:38:09,861 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:38:09,861 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:38:09,882 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 16:38:09,882 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:09,884 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:09,962 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:09,962 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:10,019 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:10,040 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-11-07 16:38:10,040 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 6 [2018-11-07 16:38:10,040 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 16:38:10,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 16:38:10,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 16:38:10,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-11-07 16:38:10,041 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 3 states. [2018-11-07 16:38:10,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:10,071 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2018-11-07 16:38:10,075 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 16:38:10,075 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-11-07 16:38:10,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:10,076 INFO L225 Difference]: With dead ends: 35 [2018-11-07 16:38:10,076 INFO L226 Difference]: Without dead ends: 27 [2018-11-07 16:38:10,077 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-11-07 16:38:10,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-11-07 16:38:10,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-11-07 16:38:10,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-11-07 16:38:10,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2018-11-07 16:38:10,090 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 17 [2018-11-07 16:38:10,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:10,090 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2018-11-07 16:38:10,090 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 16:38:10,090 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2018-11-07 16:38:10,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-11-07 16:38:10,094 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:10,094 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:10,095 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:10,095 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:10,095 INFO L82 PathProgramCache]: Analyzing trace with hash -1242161282, now seen corresponding path program 2 times [2018-11-07 16:38:10,095 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:10,096 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:10,096 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:10,096 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:10,096 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:10,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:10,207 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:10,208 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:10,208 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:10,209 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:10,209 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:10,209 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:10,210 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 16:38:10,225 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:38:10,225 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:38:10,235 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 16:38:10,235 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:10,237 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:10,269 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:10,269 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:10,382 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:10,402 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:10,402 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-11-07 16:38:10,402 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:10,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-07 16:38:10,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-07 16:38:10,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-11-07 16:38:10,403 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 5 states. [2018-11-07 16:38:10,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:10,458 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2018-11-07 16:38:10,459 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 16:38:10,459 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-11-07 16:38:10,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:10,460 INFO L225 Difference]: With dead ends: 35 [2018-11-07 16:38:10,460 INFO L226 Difference]: Without dead ends: 30 [2018-11-07 16:38:10,461 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-11-07 16:38:10,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-11-07 16:38:10,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-11-07 16:38:10,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-11-07 16:38:10,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2018-11-07 16:38:10,465 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 17 [2018-11-07 16:38:10,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:10,466 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2018-11-07 16:38:10,466 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-07 16:38:10,466 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2018-11-07 16:38:10,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-11-07 16:38:10,467 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:10,467 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:10,467 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:10,467 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:10,467 INFO L82 PathProgramCache]: Analyzing trace with hash 26004059, now seen corresponding path program 3 times [2018-11-07 16:38:10,468 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:10,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:10,469 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:10,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:10,469 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:10,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:10,969 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:10,969 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:10,969 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:10,969 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:10,970 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:10,970 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:10,970 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 16:38:10,988 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:38:10,988 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:38:11,026 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:38:11,026 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:11,028 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:11,089 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:11,089 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:11,290 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:11,311 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:11,311 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-11-07 16:38:11,311 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:11,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 16:38:11,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 16:38:11,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-11-07 16:38:11,312 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 6 states. [2018-11-07 16:38:11,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:11,424 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2018-11-07 16:38:11,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 16:38:11,425 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-11-07 16:38:11,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:11,426 INFO L225 Difference]: With dead ends: 38 [2018-11-07 16:38:11,426 INFO L226 Difference]: Without dead ends: 33 [2018-11-07 16:38:11,427 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-11-07 16:38:11,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-11-07 16:38:11,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-11-07 16:38:11,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-11-07 16:38:11,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2018-11-07 16:38:11,432 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 20 [2018-11-07 16:38:11,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:11,433 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2018-11-07 16:38:11,433 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 16:38:11,433 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2018-11-07 16:38:11,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-11-07 16:38:11,434 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:11,434 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:11,434 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:11,435 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:11,435 INFO L82 PathProgramCache]: Analyzing trace with hash 821178397, now seen corresponding path program 3 times [2018-11-07 16:38:11,435 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:11,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:11,436 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:11,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:11,436 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:11,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:11,639 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:11,639 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:11,639 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:11,640 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:11,640 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:11,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:11,640 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 16:38:11,651 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:38:11,651 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:38:11,678 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:38:11,679 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:11,681 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:11,706 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:11,706 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:11,793 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:11,816 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:11,816 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-11-07 16:38:11,816 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:11,816 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 16:38:11,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 16:38:11,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-11-07 16:38:11,817 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 6 states. [2018-11-07 16:38:11,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:11,875 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2018-11-07 16:38:11,875 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 16:38:11,876 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-11-07 16:38:11,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:11,876 INFO L225 Difference]: With dead ends: 41 [2018-11-07 16:38:11,876 INFO L226 Difference]: Without dead ends: 36 [2018-11-07 16:38:11,877 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-11-07 16:38:11,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-11-07 16:38:11,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2018-11-07 16:38:11,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-11-07 16:38:11,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2018-11-07 16:38:11,883 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 20 [2018-11-07 16:38:11,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:11,884 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2018-11-07 16:38:11,884 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 16:38:11,884 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2018-11-07 16:38:11,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-11-07 16:38:11,885 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:11,885 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:11,885 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:11,886 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:11,886 INFO L82 PathProgramCache]: Analyzing trace with hash 427509150, now seen corresponding path program 4 times [2018-11-07 16:38:11,886 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:11,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:11,887 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:11,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:11,887 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:11,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:12,459 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:12,460 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:12,460 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:12,460 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:12,460 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:12,460 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:12,461 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 16:38:12,469 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:12,469 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:38:12,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:12,483 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:12,501 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:12,501 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:12,673 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:12,693 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:12,694 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-11-07 16:38:12,694 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:12,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-07 16:38:12,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-07 16:38:12,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-11-07 16:38:12,695 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 7 states. [2018-11-07 16:38:12,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:12,793 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2018-11-07 16:38:12,793 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-07 16:38:12,794 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-11-07 16:38:12,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:12,795 INFO L225 Difference]: With dead ends: 44 [2018-11-07 16:38:12,795 INFO L226 Difference]: Without dead ends: 39 [2018-11-07 16:38:12,795 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-11-07 16:38:12,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-11-07 16:38:12,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-11-07 16:38:12,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-11-07 16:38:12,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-11-07 16:38:12,801 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 23 [2018-11-07 16:38:12,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:12,802 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-11-07 16:38:12,802 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-07 16:38:12,802 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-11-07 16:38:12,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-11-07 16:38:12,803 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:12,803 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:12,803 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:12,803 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:12,804 INFO L82 PathProgramCache]: Analyzing trace with hash 201615134, now seen corresponding path program 4 times [2018-11-07 16:38:12,804 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:12,804 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:12,805 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:12,805 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:12,805 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:12,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:13,053 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:13,053 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:13,053 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:13,054 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:13,054 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:13,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:13,054 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 16:38:13,067 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:13,067 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:38:13,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:13,078 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:13,098 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:13,098 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:13,354 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:13,373 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:13,374 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-11-07 16:38:13,374 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:13,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-07 16:38:13,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-07 16:38:13,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-11-07 16:38:13,375 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 7 states. [2018-11-07 16:38:13,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:13,444 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2018-11-07 16:38:13,445 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-07 16:38:13,445 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-11-07 16:38:13,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:13,446 INFO L225 Difference]: With dead ends: 47 [2018-11-07 16:38:13,446 INFO L226 Difference]: Without dead ends: 42 [2018-11-07 16:38:13,447 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-11-07 16:38:13,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-11-07 16:38:13,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2018-11-07 16:38:13,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-11-07 16:38:13,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2018-11-07 16:38:13,452 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 23 [2018-11-07 16:38:13,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:13,452 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2018-11-07 16:38:13,453 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-07 16:38:13,453 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2018-11-07 16:38:13,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-11-07 16:38:13,453 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:13,454 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:13,454 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:13,454 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:13,454 INFO L82 PathProgramCache]: Analyzing trace with hash 181755771, now seen corresponding path program 5 times [2018-11-07 16:38:13,454 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:13,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:13,455 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:13,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:13,456 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:13,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:13,575 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:13,576 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:13,576 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:13,576 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:13,576 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:13,576 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:13,577 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 16:38:13,599 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:38:13,599 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:38:13,811 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 16:38:13,812 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:13,814 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:13,833 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:13,833 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:14,219 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:14,240 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:14,241 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-11-07 16:38:14,241 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:14,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-07 16:38:14,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-07 16:38:14,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-11-07 16:38:14,242 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 8 states. [2018-11-07 16:38:14,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:14,351 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2018-11-07 16:38:14,359 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-07 16:38:14,359 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-11-07 16:38:14,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:14,360 INFO L225 Difference]: With dead ends: 50 [2018-11-07 16:38:14,360 INFO L226 Difference]: Without dead ends: 45 [2018-11-07 16:38:14,361 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-11-07 16:38:14,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-11-07 16:38:14,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2018-11-07 16:38:14,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-11-07 16:38:14,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2018-11-07 16:38:14,367 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 26 [2018-11-07 16:38:14,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:14,368 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2018-11-07 16:38:14,368 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-07 16:38:14,368 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2018-11-07 16:38:14,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-11-07 16:38:14,369 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:14,369 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:14,369 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:14,369 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:14,370 INFO L82 PathProgramCache]: Analyzing trace with hash -1733081987, now seen corresponding path program 5 times [2018-11-07 16:38:14,370 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:14,370 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:14,371 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:14,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:14,371 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:14,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:14,561 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:14,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:14,561 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:14,561 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:14,561 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:14,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:14,561 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 16:38:14,570 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:38:14,570 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:38:14,642 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 16:38:14,642 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:14,645 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:14,655 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:14,656 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:14,920 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:14,941 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:14,941 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-11-07 16:38:14,941 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:14,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-07 16:38:14,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-07 16:38:14,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-11-07 16:38:14,942 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 8 states. [2018-11-07 16:38:15,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:15,022 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2018-11-07 16:38:15,028 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-07 16:38:15,028 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-11-07 16:38:15,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:15,029 INFO L225 Difference]: With dead ends: 53 [2018-11-07 16:38:15,029 INFO L226 Difference]: Without dead ends: 48 [2018-11-07 16:38:15,030 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-11-07 16:38:15,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-11-07 16:38:15,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2018-11-07 16:38:15,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-11-07 16:38:15,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2018-11-07 16:38:15,040 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 26 [2018-11-07 16:38:15,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:15,041 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2018-11-07 16:38:15,041 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-07 16:38:15,041 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2018-11-07 16:38:15,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-11-07 16:38:15,042 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:15,042 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:15,042 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:15,042 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:15,043 INFO L82 PathProgramCache]: Analyzing trace with hash 1862081662, now seen corresponding path program 6 times [2018-11-07 16:38:15,043 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:15,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:15,044 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:15,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:15,044 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:15,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:15,188 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:15,188 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:15,188 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:15,188 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:15,189 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:15,189 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:15,189 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 16:38:15,197 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:38:15,198 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:38:15,208 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:38:15,209 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:15,210 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:15,224 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:15,224 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:15,735 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:15,756 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:15,756 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-11-07 16:38:15,757 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:15,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 16:38:15,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 16:38:15,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-11-07 16:38:15,758 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 9 states. [2018-11-07 16:38:15,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:15,932 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2018-11-07 16:38:15,933 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-07 16:38:15,933 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-11-07 16:38:15,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:15,934 INFO L225 Difference]: With dead ends: 56 [2018-11-07 16:38:15,934 INFO L226 Difference]: Without dead ends: 51 [2018-11-07 16:38:15,935 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-11-07 16:38:15,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-11-07 16:38:15,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2018-11-07 16:38:15,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-11-07 16:38:15,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2018-11-07 16:38:15,942 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 29 [2018-11-07 16:38:15,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:15,943 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2018-11-07 16:38:15,943 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 16:38:15,943 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2018-11-07 16:38:15,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-11-07 16:38:15,944 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:15,944 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:15,944 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:15,944 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:15,944 INFO L82 PathProgramCache]: Analyzing trace with hash 166098622, now seen corresponding path program 6 times [2018-11-07 16:38:15,944 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:15,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:15,945 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:15,946 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:15,946 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:15,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:16,097 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:16,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:16,097 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:16,097 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:16,097 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:16,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:16,097 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 16:38:16,106 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:38:16,107 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:38:16,116 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:38:16,116 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:16,119 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:16,141 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:16,144 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:16,507 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:16,529 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:16,529 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-11-07 16:38:16,529 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:16,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 16:38:16,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 16:38:16,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-11-07 16:38:16,530 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 9 states. [2018-11-07 16:38:16,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:16,750 INFO L93 Difference]: Finished difference Result 59 states and 61 transitions. [2018-11-07 16:38:16,750 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-07 16:38:16,750 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-11-07 16:38:16,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:16,751 INFO L225 Difference]: With dead ends: 59 [2018-11-07 16:38:16,751 INFO L226 Difference]: Without dead ends: 54 [2018-11-07 16:38:16,752 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-11-07 16:38:16,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-11-07 16:38:16,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2018-11-07 16:38:16,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-11-07 16:38:16,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2018-11-07 16:38:16,759 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 29 [2018-11-07 16:38:16,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:16,760 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2018-11-07 16:38:16,760 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 16:38:16,760 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2018-11-07 16:38:16,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-11-07 16:38:16,761 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:16,761 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:16,761 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:16,761 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:16,762 INFO L82 PathProgramCache]: Analyzing trace with hash -1688101733, now seen corresponding path program 7 times [2018-11-07 16:38:16,762 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:16,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:16,763 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:16,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:16,763 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:16,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:16,893 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:16,894 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:16,894 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:16,894 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:16,894 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:16,894 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:16,894 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 16:38:16,907 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:16,907 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:38:16,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:16,921 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:16,952 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:16,952 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:17,564 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:17,583 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:17,584 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-11-07 16:38:17,584 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:17,584 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 16:38:17,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 16:38:17,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-11-07 16:38:17,585 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand 10 states. [2018-11-07 16:38:17,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:17,988 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2018-11-07 16:38:17,989 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 16:38:17,989 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-11-07 16:38:17,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:17,990 INFO L225 Difference]: With dead ends: 62 [2018-11-07 16:38:17,990 INFO L226 Difference]: Without dead ends: 57 [2018-11-07 16:38:17,991 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-11-07 16:38:17,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-07 16:38:17,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2018-11-07 16:38:17,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-11-07 16:38:17,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2018-11-07 16:38:17,998 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 32 [2018-11-07 16:38:17,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:17,998 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2018-11-07 16:38:17,998 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 16:38:17,998 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2018-11-07 16:38:17,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-11-07 16:38:17,999 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:17,999 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:18,000 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:18,000 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:18,000 INFO L82 PathProgramCache]: Analyzing trace with hash 1051431133, now seen corresponding path program 7 times [2018-11-07 16:38:18,000 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:18,001 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:18,001 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:18,001 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:18,001 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:18,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:18,163 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:18,163 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:18,163 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:18,163 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:18,164 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:18,164 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:18,164 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 16:38:18,172 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:18,172 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:38:18,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:18,197 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:18,225 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:18,225 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:18,643 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:18,663 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:18,663 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-11-07 16:38:18,663 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:18,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 16:38:18,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 16:38:18,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-11-07 16:38:18,664 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 10 states. [2018-11-07 16:38:18,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:18,821 INFO L93 Difference]: Finished difference Result 65 states and 67 transitions. [2018-11-07 16:38:18,822 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 16:38:18,822 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-11-07 16:38:18,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:18,823 INFO L225 Difference]: With dead ends: 65 [2018-11-07 16:38:18,823 INFO L226 Difference]: Without dead ends: 60 [2018-11-07 16:38:18,824 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-11-07 16:38:18,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-11-07 16:38:18,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2018-11-07 16:38:18,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-11-07 16:38:18,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2018-11-07 16:38:18,831 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 32 [2018-11-07 16:38:18,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:18,831 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2018-11-07 16:38:18,831 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 16:38:18,832 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2018-11-07 16:38:18,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-11-07 16:38:18,832 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:18,832 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:18,834 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:18,834 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:18,834 INFO L82 PathProgramCache]: Analyzing trace with hash -1631958178, now seen corresponding path program 8 times [2018-11-07 16:38:18,834 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:18,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:18,835 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:18,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:18,835 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:18,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:19,546 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:19,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:19,546 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:19,546 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:19,546 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:19,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:19,547 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 16:38:19,556 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:38:19,556 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:38:20,290 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 16:38:20,290 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:20,298 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:20,382 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:20,382 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:23,009 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:23,037 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:23,037 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 12] total 21 [2018-11-07 16:38:23,037 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:23,037 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-07 16:38:23,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-07 16:38:23,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2018-11-07 16:38:23,038 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 11 states. [2018-11-07 16:38:23,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:23,234 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2018-11-07 16:38:23,241 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 16:38:23,241 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-11-07 16:38:23,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:23,241 INFO L225 Difference]: With dead ends: 68 [2018-11-07 16:38:23,242 INFO L226 Difference]: Without dead ends: 63 [2018-11-07 16:38:23,242 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 55 SyntacticMatches, 7 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2018-11-07 16:38:23,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-11-07 16:38:23,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2018-11-07 16:38:23,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-11-07 16:38:23,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2018-11-07 16:38:23,258 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 35 [2018-11-07 16:38:23,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:23,258 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2018-11-07 16:38:23,259 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-07 16:38:23,259 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2018-11-07 16:38:23,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-11-07 16:38:23,259 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:23,260 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:23,260 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:23,260 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:23,260 INFO L82 PathProgramCache]: Analyzing trace with hash 598101598, now seen corresponding path program 8 times [2018-11-07 16:38:23,260 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:23,264 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:23,264 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:23,264 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:23,264 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:23,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:23,441 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:23,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:23,441 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:23,442 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:23,442 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:23,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:23,442 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 16:38:23,451 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:38:23,451 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:38:23,855 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 16:38:23,855 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:23,860 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:23,871 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:23,871 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:24,512 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:24,534 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:24,535 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-11-07 16:38:24,535 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:24,535 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-07 16:38:24,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-07 16:38:24,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-11-07 16:38:24,536 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 11 states. [2018-11-07 16:38:24,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:24,720 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2018-11-07 16:38:24,720 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 16:38:24,720 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-11-07 16:38:24,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:24,722 INFO L225 Difference]: With dead ends: 71 [2018-11-07 16:38:24,722 INFO L226 Difference]: Without dead ends: 66 [2018-11-07 16:38:24,722 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-11-07 16:38:24,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-11-07 16:38:24,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2018-11-07 16:38:24,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-11-07 16:38:24,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2018-11-07 16:38:24,728 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 35 [2018-11-07 16:38:24,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:24,729 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2018-11-07 16:38:24,729 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-07 16:38:24,729 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2018-11-07 16:38:24,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-11-07 16:38:24,730 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:24,730 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:24,730 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:24,731 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:24,731 INFO L82 PathProgramCache]: Analyzing trace with hash 198410683, now seen corresponding path program 9 times [2018-11-07 16:38:24,731 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:24,732 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:24,732 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:24,732 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:24,732 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:24,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:24,934 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:24,934 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:24,934 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:24,934 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:24,934 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:24,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:24,935 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 16:38:24,945 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:38:24,945 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:38:24,958 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:38:24,959 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:24,960 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:24,977 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:24,977 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:25,625 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:25,651 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:25,651 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-11-07 16:38:25,651 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:25,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-07 16:38:25,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-07 16:38:25,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-11-07 16:38:25,652 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand 12 states. [2018-11-07 16:38:26,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:26,044 INFO L93 Difference]: Finished difference Result 74 states and 76 transitions. [2018-11-07 16:38:26,047 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-07 16:38:26,047 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-11-07 16:38:26,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:26,048 INFO L225 Difference]: With dead ends: 74 [2018-11-07 16:38:26,048 INFO L226 Difference]: Without dead ends: 69 [2018-11-07 16:38:26,049 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-11-07 16:38:26,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-11-07 16:38:26,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2018-11-07 16:38:26,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-11-07 16:38:26,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2018-11-07 16:38:26,055 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 38 [2018-11-07 16:38:26,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:26,055 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2018-11-07 16:38:26,055 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-07 16:38:26,055 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2018-11-07 16:38:26,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-11-07 16:38:26,056 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:26,056 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:26,056 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:26,057 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:26,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1164896963, now seen corresponding path program 9 times [2018-11-07 16:38:26,057 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:26,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:26,058 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:26,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:26,058 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:26,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:26,558 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:26,558 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:26,558 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:26,558 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:26,559 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:26,559 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:26,559 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 16:38:26,568 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:38:26,568 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:38:26,580 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:38:26,580 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:26,582 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:26,591 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:26,592 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:27,316 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:27,337 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:27,337 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-11-07 16:38:27,337 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:27,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-07 16:38:27,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-07 16:38:27,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-11-07 16:38:27,338 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 12 states. [2018-11-07 16:38:27,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:27,544 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2018-11-07 16:38:27,546 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-07 16:38:27,546 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-11-07 16:38:27,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:27,547 INFO L225 Difference]: With dead ends: 77 [2018-11-07 16:38:27,547 INFO L226 Difference]: Without dead ends: 72 [2018-11-07 16:38:27,548 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-11-07 16:38:27,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-11-07 16:38:27,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2018-11-07 16:38:27,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-11-07 16:38:27,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2018-11-07 16:38:27,553 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 38 [2018-11-07 16:38:27,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:27,554 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2018-11-07 16:38:27,554 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-07 16:38:27,554 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2018-11-07 16:38:27,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-11-07 16:38:27,555 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:27,555 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:27,555 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:27,555 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:27,555 INFO L82 PathProgramCache]: Analyzing trace with hash -187641282, now seen corresponding path program 10 times [2018-11-07 16:38:27,556 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:27,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:27,556 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:27,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:27,557 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:27,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:27,761 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:27,761 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:27,761 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:27,761 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:27,761 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:27,761 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:27,761 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 16:38:27,769 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:27,769 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:38:27,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:27,784 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:27,801 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:27,801 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:28,955 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:28,975 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:28,976 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-11-07 16:38:28,976 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:28,976 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 16:38:28,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 16:38:28,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-11-07 16:38:28,977 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand 13 states. [2018-11-07 16:38:29,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:29,273 INFO L93 Difference]: Finished difference Result 80 states and 82 transitions. [2018-11-07 16:38:29,275 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 16:38:29,275 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-11-07 16:38:29,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:29,276 INFO L225 Difference]: With dead ends: 80 [2018-11-07 16:38:29,276 INFO L226 Difference]: Without dead ends: 75 [2018-11-07 16:38:29,277 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-11-07 16:38:29,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-11-07 16:38:29,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2018-11-07 16:38:29,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-11-07 16:38:29,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2018-11-07 16:38:29,281 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 41 [2018-11-07 16:38:29,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:29,281 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2018-11-07 16:38:29,281 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 16:38:29,282 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2018-11-07 16:38:29,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-11-07 16:38:29,282 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:29,282 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:29,282 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:29,283 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:29,283 INFO L82 PathProgramCache]: Analyzing trace with hash 500035070, now seen corresponding path program 10 times [2018-11-07 16:38:29,283 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:29,283 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:29,284 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:29,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:29,284 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:29,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:29,752 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:29,752 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:29,752 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:29,752 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:29,752 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:29,752 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:29,753 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 16:38:29,773 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:29,773 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:38:29,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:29,800 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:29,869 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:29,869 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:31,094 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:31,114 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:31,115 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-11-07 16:38:31,115 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:31,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 16:38:31,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 16:38:31,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-11-07 16:38:31,116 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 13 states. [2018-11-07 16:38:31,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:31,495 INFO L93 Difference]: Finished difference Result 83 states and 85 transitions. [2018-11-07 16:38:31,497 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 16:38:31,497 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-11-07 16:38:31,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:31,497 INFO L225 Difference]: With dead ends: 83 [2018-11-07 16:38:31,498 INFO L226 Difference]: Without dead ends: 78 [2018-11-07 16:38:31,498 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-11-07 16:38:31,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-11-07 16:38:31,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2018-11-07 16:38:31,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-11-07 16:38:31,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2018-11-07 16:38:31,502 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 41 [2018-11-07 16:38:31,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:31,503 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2018-11-07 16:38:31,503 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 16:38:31,503 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2018-11-07 16:38:31,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-11-07 16:38:31,503 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:31,504 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:31,504 INFO L423 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:31,504 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:31,504 INFO L82 PathProgramCache]: Analyzing trace with hash 860688091, now seen corresponding path program 11 times [2018-11-07 16:38:31,504 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:31,505 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:31,505 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:31,505 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:31,505 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:31,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:31,839 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:31,840 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:31,840 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:31,840 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:31,840 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:31,840 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:31,840 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 16:38:31,848 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:38:31,848 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:38:32,209 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-07 16:38:32,209 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:32,215 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:32,240 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:32,240 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:33,465 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:33,484 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:33,485 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-11-07 16:38:33,485 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:33,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 16:38:33,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 16:38:33,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-11-07 16:38:33,486 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand 14 states. [2018-11-07 16:38:34,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:34,251 INFO L93 Difference]: Finished difference Result 86 states and 88 transitions. [2018-11-07 16:38:34,251 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 16:38:34,251 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-11-07 16:38:34,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:34,252 INFO L225 Difference]: With dead ends: 86 [2018-11-07 16:38:34,253 INFO L226 Difference]: Without dead ends: 81 [2018-11-07 16:38:34,253 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-11-07 16:38:34,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-11-07 16:38:34,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2018-11-07 16:38:34,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-11-07 16:38:34,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2018-11-07 16:38:34,257 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 44 [2018-11-07 16:38:34,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:34,258 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2018-11-07 16:38:34,258 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 16:38:34,258 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2018-11-07 16:38:34,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-11-07 16:38:34,258 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:34,259 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:34,259 INFO L423 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:34,259 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:34,259 INFO L82 PathProgramCache]: Analyzing trace with hash -2087071331, now seen corresponding path program 11 times [2018-11-07 16:38:34,259 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:34,260 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:34,260 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:34,260 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:34,260 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:34,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:35,089 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:35,090 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:35,090 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:35,090 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:35,090 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:35,090 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:35,090 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 16:38:35,099 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:38:35,099 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:38:35,559 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-07 16:38:35,559 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:35,563 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:35,571 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:35,572 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:36,680 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:36,699 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:36,699 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-11-07 16:38:36,699 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:36,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 16:38:36,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 16:38:36,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-11-07 16:38:36,701 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 14 states. [2018-11-07 16:38:36,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:36,939 INFO L93 Difference]: Finished difference Result 89 states and 91 transitions. [2018-11-07 16:38:36,940 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 16:38:36,940 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-11-07 16:38:36,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:36,941 INFO L225 Difference]: With dead ends: 89 [2018-11-07 16:38:36,941 INFO L226 Difference]: Without dead ends: 84 [2018-11-07 16:38:36,942 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-11-07 16:38:36,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-11-07 16:38:36,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2018-11-07 16:38:36,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-11-07 16:38:36,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2018-11-07 16:38:36,946 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 44 [2018-11-07 16:38:36,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:36,946 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2018-11-07 16:38:36,946 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 16:38:36,946 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2018-11-07 16:38:36,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-11-07 16:38:36,947 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:36,947 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:36,947 INFO L423 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:36,947 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:36,947 INFO L82 PathProgramCache]: Analyzing trace with hash -1361137378, now seen corresponding path program 12 times [2018-11-07 16:38:36,947 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:36,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:36,948 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:36,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:36,948 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:36,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:37,456 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:37,456 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:37,456 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:37,456 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:37,457 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:37,457 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:37,457 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 16:38:37,465 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:38:37,465 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:38:37,482 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:38:37,482 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:37,484 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:37,513 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:37,513 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:38,802 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:38,821 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:38,821 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-11-07 16:38:38,821 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:38,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-07 16:38:38,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-07 16:38:38,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-11-07 16:38:38,823 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand 15 states. [2018-11-07 16:38:39,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:39,131 INFO L93 Difference]: Finished difference Result 92 states and 94 transitions. [2018-11-07 16:38:39,132 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-07 16:38:39,132 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-11-07 16:38:39,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:39,133 INFO L225 Difference]: With dead ends: 92 [2018-11-07 16:38:39,133 INFO L226 Difference]: Without dead ends: 87 [2018-11-07 16:38:39,134 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-11-07 16:38:39,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-11-07 16:38:39,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2018-11-07 16:38:39,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-11-07 16:38:39,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2018-11-07 16:38:39,139 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 47 [2018-11-07 16:38:39,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:39,139 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2018-11-07 16:38:39,140 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-07 16:38:39,140 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2018-11-07 16:38:39,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-11-07 16:38:39,140 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:39,140 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:39,141 INFO L423 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:39,141 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:39,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1385736802, now seen corresponding path program 12 times [2018-11-07 16:38:39,141 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:39,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:39,142 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:39,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:39,142 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:39,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:39,704 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:39,704 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:39,704 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:39,704 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:39,704 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:39,704 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:39,705 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:38:39,714 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:38:39,714 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:38:39,729 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:38:39,729 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:39,731 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:39,756 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:39,756 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:41,318 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:41,339 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:41,340 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-11-07 16:38:41,340 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:41,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-07 16:38:41,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-07 16:38:41,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-11-07 16:38:41,341 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 15 states. [2018-11-07 16:38:41,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:41,635 INFO L93 Difference]: Finished difference Result 95 states and 97 transitions. [2018-11-07 16:38:41,635 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-07 16:38:41,635 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-11-07 16:38:41,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:41,636 INFO L225 Difference]: With dead ends: 95 [2018-11-07 16:38:41,636 INFO L226 Difference]: Without dead ends: 90 [2018-11-07 16:38:41,637 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-11-07 16:38:41,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-11-07 16:38:41,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2018-11-07 16:38:41,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-11-07 16:38:41,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2018-11-07 16:38:41,641 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 47 [2018-11-07 16:38:41,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:41,641 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2018-11-07 16:38:41,641 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-07 16:38:41,641 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2018-11-07 16:38:41,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-11-07 16:38:41,642 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:41,642 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:41,642 INFO L423 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:41,642 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:41,642 INFO L82 PathProgramCache]: Analyzing trace with hash -2022685701, now seen corresponding path program 13 times [2018-11-07 16:38:41,642 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:41,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:41,643 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:41,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:41,643 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:41,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:41,874 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:41,874 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:41,874 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:41,874 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:41,874 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:41,874 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:41,875 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 16:38:41,885 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:41,885 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:38:41,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:41,904 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:41,931 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:41,931 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:43,358 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:43,378 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:43,378 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-11-07 16:38:43,378 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:43,378 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 16:38:43,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 16:38:43,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-11-07 16:38:43,379 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand 16 states. [2018-11-07 16:38:43,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:43,960 INFO L93 Difference]: Finished difference Result 98 states and 100 transitions. [2018-11-07 16:38:43,960 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 16:38:43,961 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-11-07 16:38:43,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:43,962 INFO L225 Difference]: With dead ends: 98 [2018-11-07 16:38:43,962 INFO L226 Difference]: Without dead ends: 93 [2018-11-07 16:38:43,963 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-11-07 16:38:43,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-11-07 16:38:43,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2018-11-07 16:38:43,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-11-07 16:38:43,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2018-11-07 16:38:43,969 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 50 [2018-11-07 16:38:43,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:43,969 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2018-11-07 16:38:43,969 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 16:38:43,969 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2018-11-07 16:38:43,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-11-07 16:38:43,970 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:43,970 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:43,970 INFO L423 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:43,970 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:43,970 INFO L82 PathProgramCache]: Analyzing trace with hash 1350288893, now seen corresponding path program 13 times [2018-11-07 16:38:43,971 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:43,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:43,971 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:43,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:43,972 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:43,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:44,229 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:44,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:44,230 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:44,230 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:44,230 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:44,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:44,230 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 16:38:44,239 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:44,239 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:38:44,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:44,255 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:44,285 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:44,285 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:45,664 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:45,685 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:45,686 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-11-07 16:38:45,686 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:45,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 16:38:45,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 16:38:45,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-11-07 16:38:45,687 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand 16 states. [2018-11-07 16:38:45,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:45,997 INFO L93 Difference]: Finished difference Result 101 states and 103 transitions. [2018-11-07 16:38:45,998 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 16:38:45,998 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-11-07 16:38:45,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:45,999 INFO L225 Difference]: With dead ends: 101 [2018-11-07 16:38:45,999 INFO L226 Difference]: Without dead ends: 96 [2018-11-07 16:38:46,000 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-11-07 16:38:46,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-11-07 16:38:46,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2018-11-07 16:38:46,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-11-07 16:38:46,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2018-11-07 16:38:46,006 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 50 [2018-11-07 16:38:46,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:46,006 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2018-11-07 16:38:46,006 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 16:38:46,006 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2018-11-07 16:38:46,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-11-07 16:38:46,007 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:46,007 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:46,007 INFO L423 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:46,007 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:46,008 INFO L82 PathProgramCache]: Analyzing trace with hash -603854850, now seen corresponding path program 14 times [2018-11-07 16:38:46,008 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:46,008 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:46,008 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:38:46,008 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:46,009 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:46,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:46,606 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:46,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:46,606 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:46,606 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:46,606 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:46,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:46,607 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 16:38:46,614 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:38:46,615 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:38:51,909 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-07 16:38:51,909 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:51,945 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:51,961 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:51,961 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:53,731 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:53,751 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:53,752 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-11-07 16:38:53,752 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:53,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-07 16:38:53,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-07 16:38:53,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-11-07 16:38:53,753 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand 17 states. [2018-11-07 16:38:54,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:54,197 INFO L93 Difference]: Finished difference Result 104 states and 106 transitions. [2018-11-07 16:38:54,198 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 16:38:54,198 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-11-07 16:38:54,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:54,199 INFO L225 Difference]: With dead ends: 104 [2018-11-07 16:38:54,199 INFO L226 Difference]: Without dead ends: 99 [2018-11-07 16:38:54,200 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-11-07 16:38:54,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-11-07 16:38:54,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2018-11-07 16:38:54,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-11-07 16:38:54,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 100 transitions. [2018-11-07 16:38:54,206 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 100 transitions. Word has length 53 [2018-11-07 16:38:54,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:54,206 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 100 transitions. [2018-11-07 16:38:54,206 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-07 16:38:54,206 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 100 transitions. [2018-11-07 16:38:54,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-11-07 16:38:54,207 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:54,207 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:54,208 INFO L423 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:54,208 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:54,208 INFO L82 PathProgramCache]: Analyzing trace with hash 402425150, now seen corresponding path program 14 times [2018-11-07 16:38:54,208 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:54,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:54,209 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:54,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:54,209 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:54,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:54,744 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:54,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:54,744 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:54,744 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:54,744 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:54,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:54,744 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 16:38:54,754 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:38:54,754 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:38:56,938 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-07 16:38:56,938 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:56,951 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:56,978 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:56,978 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:38:58,895 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:58,915 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:38:58,915 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-11-07 16:38:58,915 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:38:58,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-07 16:38:58,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-07 16:38:58,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-11-07 16:38:58,916 INFO L87 Difference]: Start difference. First operand 98 states and 100 transitions. Second operand 17 states. [2018-11-07 16:38:59,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:38:59,256 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2018-11-07 16:38:59,256 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 16:38:59,256 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-11-07 16:38:59,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:38:59,257 INFO L225 Difference]: With dead ends: 107 [2018-11-07 16:38:59,258 INFO L226 Difference]: Without dead ends: 102 [2018-11-07 16:38:59,259 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-11-07 16:38:59,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-11-07 16:38:59,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2018-11-07 16:38:59,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-11-07 16:38:59,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2018-11-07 16:38:59,264 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 53 [2018-11-07 16:38:59,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:38:59,264 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2018-11-07 16:38:59,264 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-07 16:38:59,265 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2018-11-07 16:38:59,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-11-07 16:38:59,265 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:38:59,265 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:38:59,266 INFO L423 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:38:59,266 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:38:59,266 INFO L82 PathProgramCache]: Analyzing trace with hash 1012867355, now seen corresponding path program 15 times [2018-11-07 16:38:59,266 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:38:59,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:59,267 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:38:59,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:38:59,267 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:38:59,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:38:59,586 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:59,586 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:59,586 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:38:59,587 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:38:59,587 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:38:59,587 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:38:59,587 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 16:38:59,595 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:38:59,595 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:38:59,613 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:38:59,613 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:38:59,615 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:38:59,632 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:38:59,632 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:39:01,626 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:01,646 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:39:01,646 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-11-07 16:39:01,646 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:39:01,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-07 16:39:01,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-07 16:39:01,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 16:39:01,648 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand 18 states. [2018-11-07 16:39:02,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:39:02,193 INFO L93 Difference]: Finished difference Result 110 states and 112 transitions. [2018-11-07 16:39:02,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-07 16:39:02,193 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-11-07 16:39:02,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:39:02,195 INFO L225 Difference]: With dead ends: 110 [2018-11-07 16:39:02,195 INFO L226 Difference]: Without dead ends: 105 [2018-11-07 16:39:02,196 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 16:39:02,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-11-07 16:39:02,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 104. [2018-11-07 16:39:02,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2018-11-07 16:39:02,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 106 transitions. [2018-11-07 16:39:02,200 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 106 transitions. Word has length 56 [2018-11-07 16:39:02,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:39:02,201 INFO L480 AbstractCegarLoop]: Abstraction has 104 states and 106 transitions. [2018-11-07 16:39:02,201 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-07 16:39:02,201 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 106 transitions. [2018-11-07 16:39:02,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-11-07 16:39:02,202 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:39:02,202 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:39:02,202 INFO L423 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:39:02,202 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:39:02,202 INFO L82 PathProgramCache]: Analyzing trace with hash 2003628637, now seen corresponding path program 15 times [2018-11-07 16:39:02,202 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:39:02,203 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:02,203 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:39:02,203 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:02,203 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:39:02,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:39:02,465 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:02,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:02,465 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:39:02,465 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:39:02,465 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:39:02,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:02,466 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 16:39:02,474 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:39:02,474 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:39:02,490 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:39:02,490 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:39:02,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:39:02,503 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:02,503 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:39:04,289 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:04,309 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:39:04,309 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-11-07 16:39:04,309 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:39:04,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-07 16:39:04,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-07 16:39:04,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 16:39:04,310 INFO L87 Difference]: Start difference. First operand 104 states and 106 transitions. Second operand 18 states. [2018-11-07 16:39:04,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:39:04,708 INFO L93 Difference]: Finished difference Result 113 states and 115 transitions. [2018-11-07 16:39:04,709 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-07 16:39:04,709 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-11-07 16:39:04,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:39:04,710 INFO L225 Difference]: With dead ends: 113 [2018-11-07 16:39:04,710 INFO L226 Difference]: Without dead ends: 108 [2018-11-07 16:39:04,711 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 16:39:04,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2018-11-07 16:39:04,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2018-11-07 16:39:04,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-11-07 16:39:04,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2018-11-07 16:39:04,716 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 56 [2018-11-07 16:39:04,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:39:04,716 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2018-11-07 16:39:04,717 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-07 16:39:04,717 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2018-11-07 16:39:04,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-11-07 16:39:04,717 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:39:04,717 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:39:04,718 INFO L423 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:39:04,718 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:39:04,718 INFO L82 PathProgramCache]: Analyzing trace with hash 1020819166, now seen corresponding path program 16 times [2018-11-07 16:39:04,718 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:39:04,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:04,719 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:39:04,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:04,719 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:39:04,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:39:05,209 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 16:39:05,210 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:05,210 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:39:05,210 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:39:05,210 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:39:05,210 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:05,210 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 16:39:05,218 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:39:05,219 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:39:05,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:39:05,240 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:39:05,250 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 16:39:05,250 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:39:07,641 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 16:39:07,660 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:39:07,660 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-11-07 16:39:07,660 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:39:07,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 16:39:07,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 16:39:07,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 16:39:07,661 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand 19 states. [2018-11-07 16:39:08,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:39:08,180 INFO L93 Difference]: Finished difference Result 116 states and 118 transitions. [2018-11-07 16:39:08,181 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 16:39:08,181 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-11-07 16:39:08,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:39:08,182 INFO L225 Difference]: With dead ends: 116 [2018-11-07 16:39:08,182 INFO L226 Difference]: Without dead ends: 111 [2018-11-07 16:39:08,182 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 16:39:08,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-11-07 16:39:08,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 110. [2018-11-07 16:39:08,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-11-07 16:39:08,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 112 transitions. [2018-11-07 16:39:08,187 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 112 transitions. Word has length 59 [2018-11-07 16:39:08,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:39:08,187 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 112 transitions. [2018-11-07 16:39:08,187 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 16:39:08,187 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 112 transitions. [2018-11-07 16:39:08,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-11-07 16:39:08,188 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:39:08,188 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:39:08,188 INFO L423 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:39:08,188 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:39:08,188 INFO L82 PathProgramCache]: Analyzing trace with hash -745046818, now seen corresponding path program 16 times [2018-11-07 16:39:08,188 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:39:08,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:08,189 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:39:08,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:08,189 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:39:08,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:39:08,594 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 16:39:08,595 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:08,595 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:39:08,595 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:39:08,595 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:39:08,595 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:08,596 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:39:08,606 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:39:08,606 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:39:08,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:39:08,622 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:39:08,648 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 16:39:08,648 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:39:10,579 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 16:39:10,600 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:39:10,601 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-11-07 16:39:10,601 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:39:10,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 16:39:10,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 16:39:10,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 16:39:10,602 INFO L87 Difference]: Start difference. First operand 110 states and 112 transitions. Second operand 19 states. [2018-11-07 16:39:11,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:39:11,143 INFO L93 Difference]: Finished difference Result 119 states and 121 transitions. [2018-11-07 16:39:11,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 16:39:11,144 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-11-07 16:39:11,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:39:11,145 INFO L225 Difference]: With dead ends: 119 [2018-11-07 16:39:11,145 INFO L226 Difference]: Without dead ends: 114 [2018-11-07 16:39:11,146 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 16:39:11,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-11-07 16:39:11,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2018-11-07 16:39:11,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2018-11-07 16:39:11,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 115 transitions. [2018-11-07 16:39:11,152 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 115 transitions. Word has length 59 [2018-11-07 16:39:11,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:39:11,152 INFO L480 AbstractCegarLoop]: Abstraction has 113 states and 115 transitions. [2018-11-07 16:39:11,152 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 16:39:11,153 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 115 transitions. [2018-11-07 16:39:11,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-11-07 16:39:11,153 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:39:11,153 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:39:11,153 INFO L423 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:39:11,154 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:39:11,154 INFO L82 PathProgramCache]: Analyzing trace with hash 1690019387, now seen corresponding path program 17 times [2018-11-07 16:39:11,154 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:39:11,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:11,155 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:39:11,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:11,155 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:39:11,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:39:11,431 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:11,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:11,431 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:39:11,431 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:39:11,431 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:39:11,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:11,432 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 16:39:11,439 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:39:11,439 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:39:24,686 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-11-07 16:39:24,686 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:39:24,793 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:39:24,810 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:24,811 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:39:27,407 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:27,428 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:39:27,428 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-11-07 16:39:27,428 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:39:27,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-07 16:39:27,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-07 16:39:27,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 16:39:27,430 INFO L87 Difference]: Start difference. First operand 113 states and 115 transitions. Second operand 20 states. [2018-11-07 16:39:28,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:39:28,022 INFO L93 Difference]: Finished difference Result 122 states and 124 transitions. [2018-11-07 16:39:28,022 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-07 16:39:28,022 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-11-07 16:39:28,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:39:28,024 INFO L225 Difference]: With dead ends: 122 [2018-11-07 16:39:28,024 INFO L226 Difference]: Without dead ends: 117 [2018-11-07 16:39:28,025 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 16:39:28,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-11-07 16:39:28,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2018-11-07 16:39:28,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2018-11-07 16:39:28,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 118 transitions. [2018-11-07 16:39:28,030 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 118 transitions. Word has length 62 [2018-11-07 16:39:28,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:39:28,030 INFO L480 AbstractCegarLoop]: Abstraction has 116 states and 118 transitions. [2018-11-07 16:39:28,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-07 16:39:28,030 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 118 transitions. [2018-11-07 16:39:28,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-11-07 16:39:28,031 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:39:28,031 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:39:28,031 INFO L423 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:39:28,031 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:39:28,031 INFO L82 PathProgramCache]: Analyzing trace with hash 1310938813, now seen corresponding path program 17 times [2018-11-07 16:39:28,032 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:39:28,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:28,032 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:39:28,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:28,033 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:39:28,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:39:28,354 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:28,354 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:28,354 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:39:28,355 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:39:28,355 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:39:28,355 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:28,355 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 16:39:28,363 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:39:28,363 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:39:40,171 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-11-07 16:39:40,171 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:39:40,234 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:39:40,254 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:40,254 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:39:42,788 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:42,808 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:39:42,809 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-11-07 16:39:42,809 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:39:42,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-07 16:39:42,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-07 16:39:42,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 16:39:42,810 INFO L87 Difference]: Start difference. First operand 116 states and 118 transitions. Second operand 20 states. [2018-11-07 16:39:43,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:39:43,373 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2018-11-07 16:39:43,373 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-07 16:39:43,374 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-11-07 16:39:43,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:39:43,375 INFO L225 Difference]: With dead ends: 125 [2018-11-07 16:39:43,375 INFO L226 Difference]: Without dead ends: 120 [2018-11-07 16:39:43,376 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 16:39:43,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-11-07 16:39:43,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2018-11-07 16:39:43,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-11-07 16:39:43,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2018-11-07 16:39:43,379 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 62 [2018-11-07 16:39:43,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:39:43,380 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2018-11-07 16:39:43,380 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-07 16:39:43,380 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2018-11-07 16:39:43,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-11-07 16:39:43,381 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:39:43,381 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:39:43,381 INFO L423 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:39:43,381 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:39:43,381 INFO L82 PathProgramCache]: Analyzing trace with hash 595615166, now seen corresponding path program 18 times [2018-11-07 16:39:43,381 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:39:43,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:43,382 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:39:43,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:43,382 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:39:43,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:39:44,954 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:44,954 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:44,954 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:39:44,954 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:39:44,954 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:39:44,954 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:44,954 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:39:44,964 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:39:44,964 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:39:44,986 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:39:44,986 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:39:44,988 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:39:45,019 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:45,019 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:39:47,614 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:47,636 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:39:47,636 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-11-07 16:39:47,636 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:39:47,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-07 16:39:47,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-07 16:39:47,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 16:39:47,638 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand 21 states. [2018-11-07 16:39:48,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:39:48,434 INFO L93 Difference]: Finished difference Result 128 states and 130 transitions. [2018-11-07 16:39:48,435 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-07 16:39:48,435 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-11-07 16:39:48,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:39:48,436 INFO L225 Difference]: With dead ends: 128 [2018-11-07 16:39:48,436 INFO L226 Difference]: Without dead ends: 123 [2018-11-07 16:39:48,437 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 16:39:48,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-11-07 16:39:48,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2018-11-07 16:39:48,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-11-07 16:39:48,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 124 transitions. [2018-11-07 16:39:48,441 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 124 transitions. Word has length 65 [2018-11-07 16:39:48,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:39:48,442 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 124 transitions. [2018-11-07 16:39:48,442 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-07 16:39:48,442 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 124 transitions. [2018-11-07 16:39:48,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-11-07 16:39:48,443 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:39:48,443 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:39:48,443 INFO L423 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:39:48,443 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:39:48,443 INFO L82 PathProgramCache]: Analyzing trace with hash 650263678, now seen corresponding path program 18 times [2018-11-07 16:39:48,443 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:39:48,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:48,444 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:39:48,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:48,444 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:39:48,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:39:48,845 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:48,846 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:48,846 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:39:48,846 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:39:48,846 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:39:48,846 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:48,846 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 16:39:48,855 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:39:48,855 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:39:48,871 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:39:48,871 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:39:48,873 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:39:48,890 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:48,890 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:39:51,466 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:51,485 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:39:51,486 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-11-07 16:39:51,486 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:39:51,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-07 16:39:51,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-07 16:39:51,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 16:39:51,487 INFO L87 Difference]: Start difference. First operand 122 states and 124 transitions. Second operand 21 states. [2018-11-07 16:39:52,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:39:52,021 INFO L93 Difference]: Finished difference Result 131 states and 133 transitions. [2018-11-07 16:39:52,022 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-07 16:39:52,022 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-11-07 16:39:52,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:39:52,023 INFO L225 Difference]: With dead ends: 131 [2018-11-07 16:39:52,023 INFO L226 Difference]: Without dead ends: 126 [2018-11-07 16:39:52,024 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 16:39:52,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-11-07 16:39:52,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2018-11-07 16:39:52,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2018-11-07 16:39:52,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 127 transitions. [2018-11-07 16:39:52,030 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 127 transitions. Word has length 65 [2018-11-07 16:39:52,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:39:52,031 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 127 transitions. [2018-11-07 16:39:52,031 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-07 16:39:52,031 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 127 transitions. [2018-11-07 16:39:52,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-11-07 16:39:52,032 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:39:52,032 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:39:52,032 INFO L423 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:39:52,032 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:39:52,032 INFO L82 PathProgramCache]: Analyzing trace with hash 296211291, now seen corresponding path program 19 times [2018-11-07 16:39:52,033 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:39:52,033 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:52,033 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:39:52,033 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:52,033 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:39:52,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:39:52,673 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:52,673 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:52,674 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:39:52,674 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:39:52,674 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:39:52,674 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:52,675 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 16:39:52,684 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:39:52,684 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:39:52,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:39:52,702 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:39:52,724 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:52,725 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:39:55,542 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:55,561 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:39:55,561 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-11-07 16:39:55,562 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:39:55,562 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-07 16:39:55,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-07 16:39:55,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-11-07 16:39:55,563 INFO L87 Difference]: Start difference. First operand 125 states and 127 transitions. Second operand 22 states. [2018-11-07 16:39:56,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:39:56,301 INFO L93 Difference]: Finished difference Result 134 states and 136 transitions. [2018-11-07 16:39:56,302 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-07 16:39:56,302 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-11-07 16:39:56,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:39:56,304 INFO L225 Difference]: With dead ends: 134 [2018-11-07 16:39:56,304 INFO L226 Difference]: Without dead ends: 129 [2018-11-07 16:39:56,305 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-11-07 16:39:56,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-11-07 16:39:56,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 128. [2018-11-07 16:39:56,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-11-07 16:39:56,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 130 transitions. [2018-11-07 16:39:56,310 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 130 transitions. Word has length 68 [2018-11-07 16:39:56,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:39:56,311 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 130 transitions. [2018-11-07 16:39:56,311 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-07 16:39:56,311 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 130 transitions. [2018-11-07 16:39:56,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-11-07 16:39:56,312 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:39:56,312 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:39:56,312 INFO L423 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:39:56,312 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:39:56,312 INFO L82 PathProgramCache]: Analyzing trace with hash -1982532835, now seen corresponding path program 19 times [2018-11-07 16:39:56,312 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:39:56,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:56,313 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:39:56,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:39:56,313 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:39:56,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:39:56,718 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:56,718 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:56,718 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:39:56,718 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:39:56,719 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:39:56,719 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:39:56,719 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 16:39:56,728 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:39:56,728 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:39:56,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:39:56,746 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:39:56,761 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:56,761 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:39:59,814 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:39:59,835 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:39:59,835 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-11-07 16:39:59,835 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:39:59,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-07 16:39:59,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-07 16:39:59,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-11-07 16:39:59,836 INFO L87 Difference]: Start difference. First operand 128 states and 130 transitions. Second operand 22 states. [2018-11-07 16:40:00,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:40:00,416 INFO L93 Difference]: Finished difference Result 137 states and 139 transitions. [2018-11-07 16:40:00,417 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-07 16:40:00,417 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-11-07 16:40:00,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:40:00,418 INFO L225 Difference]: With dead ends: 137 [2018-11-07 16:40:00,418 INFO L226 Difference]: Without dead ends: 132 [2018-11-07 16:40:00,420 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-11-07 16:40:00,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-11-07 16:40:00,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131. [2018-11-07 16:40:00,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-11-07 16:40:00,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2018-11-07 16:40:00,425 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 68 [2018-11-07 16:40:00,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:40:00,426 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2018-11-07 16:40:00,426 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-07 16:40:00,426 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2018-11-07 16:40:00,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-11-07 16:40:00,426 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:40:00,427 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:40:00,427 INFO L423 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:40:00,427 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:40:00,427 INFO L82 PathProgramCache]: Analyzing trace with hash 1402444958, now seen corresponding path program 20 times [2018-11-07 16:40:00,427 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:40:00,428 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:00,428 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:40:00,428 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:00,428 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:40:00,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:02,005 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:40:02,005 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:02,005 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:40:02,005 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:40:02,006 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:40:02,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:02,006 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:40:02,015 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:40:02,016 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:40:12,453 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-11-07 16:40:12,453 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:40:12,498 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:40:12,562 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:40:12,563 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:40:39,456 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 607 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:40:39,476 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:40:39,476 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 24] total 45 [2018-11-07 16:40:39,476 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:40:39,477 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-07 16:40:39,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-07 16:40:39,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=550, Invalid=1421, Unknown=9, NotChecked=0, Total=1980 [2018-11-07 16:40:39,478 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand 23 states. [2018-11-07 16:40:40,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:40:40,239 INFO L93 Difference]: Finished difference Result 140 states and 142 transitions. [2018-11-07 16:40:40,239 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-07 16:40:40,240 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 71 [2018-11-07 16:40:40,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:40:40,241 INFO L225 Difference]: With dead ends: 140 [2018-11-07 16:40:40,241 INFO L226 Difference]: Without dead ends: 135 [2018-11-07 16:40:40,243 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 117 SyntacticMatches, 5 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 28.4s TimeCoverageRelationStatistics Valid=550, Invalid=1421, Unknown=9, NotChecked=0, Total=1980 [2018-11-07 16:40:40,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-11-07 16:40:40,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 134. [2018-11-07 16:40:40,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2018-11-07 16:40:40,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 136 transitions. [2018-11-07 16:40:40,249 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 136 transitions. Word has length 71 [2018-11-07 16:40:40,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:40:40,249 INFO L480 AbstractCegarLoop]: Abstraction has 134 states and 136 transitions. [2018-11-07 16:40:40,249 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-07 16:40:40,249 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 136 transitions. [2018-11-07 16:40:40,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-11-07 16:40:40,250 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:40:40,250 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:40:40,250 INFO L423 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:40:40,250 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:40:40,251 INFO L82 PathProgramCache]: Analyzing trace with hash -930692066, now seen corresponding path program 20 times [2018-11-07 16:40:40,251 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:40:40,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:40,251 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:40:40,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:40,252 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:40:40,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:40:40,632 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:40:40,632 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:40,633 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:40:40,633 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:40:40,633 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:40:40,633 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:40:40,633 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 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 16:40:40,642 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:40:40,642 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:40:54,884 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-11-07 16:40:54,885 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:40:54,910 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:40:54,932 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:40:54,933 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:40:57,791 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:40:57,810 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:40:57,810 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-11-07 16:40:57,811 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:40:57,811 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-07 16:40:57,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-07 16:40:57,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1366, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 16:40:57,812 INFO L87 Difference]: Start difference. First operand 134 states and 136 transitions. Second operand 23 states. [2018-11-07 16:40:59,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:40:59,827 INFO L93 Difference]: Finished difference Result 143 states and 145 transitions. [2018-11-07 16:40:59,827 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-07 16:40:59,827 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 71 [2018-11-07 16:40:59,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:40:59,828 INFO L225 Difference]: With dead ends: 143 [2018-11-07 16:40:59,828 INFO L226 Difference]: Without dead ends: 138 [2018-11-07 16:40:59,829 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 121 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=526, Invalid=1366, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 16:40:59,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-11-07 16:40:59,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 137. [2018-11-07 16:40:59,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2018-11-07 16:40:59,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 139 transitions. [2018-11-07 16:40:59,835 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 139 transitions. Word has length 71 [2018-11-07 16:40:59,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:40:59,835 INFO L480 AbstractCegarLoop]: Abstraction has 137 states and 139 transitions. [2018-11-07 16:40:59,835 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-07 16:40:59,836 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 139 transitions. [2018-11-07 16:40:59,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-11-07 16:40:59,836 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:40:59,836 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:40:59,837 INFO L423 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:40:59,837 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:40:59,837 INFO L82 PathProgramCache]: Analyzing trace with hash 1925556347, now seen corresponding path program 21 times [2018-11-07 16:40:59,837 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:40:59,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:59,838 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:40:59,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:40:59,838 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:40:59,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:41:00,244 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:41:00,244 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:41:00,244 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:41:00,244 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:41:00,244 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:41:00,244 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:41:00,244 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 16:41:00,254 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:41:00,254 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:41:00,276 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:41:00,277 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:41:00,278 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:41:00,302 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:41:00,302 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:41:03,965 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:41:03,984 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:41:03,984 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-11-07 16:41:03,984 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:41:03,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-07 16:41:03,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-07 16:41:03,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 16:41:03,986 INFO L87 Difference]: Start difference. First operand 137 states and 139 transitions. Second operand 24 states. [2018-11-07 16:41:04,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:41:04,850 INFO L93 Difference]: Finished difference Result 146 states and 148 transitions. [2018-11-07 16:41:04,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-07 16:41:04,851 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 74 [2018-11-07 16:41:04,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:41:04,852 INFO L225 Difference]: With dead ends: 146 [2018-11-07 16:41:04,852 INFO L226 Difference]: Without dead ends: 141 [2018-11-07 16:41:04,853 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 126 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 16:41:04,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2018-11-07 16:41:04,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 140. [2018-11-07 16:41:04,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2018-11-07 16:41:04,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 142 transitions. [2018-11-07 16:41:04,859 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 142 transitions. Word has length 74 [2018-11-07 16:41:04,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:41:04,859 INFO L480 AbstractCegarLoop]: Abstraction has 140 states and 142 transitions. [2018-11-07 16:41:04,859 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-07 16:41:04,859 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 142 transitions. [2018-11-07 16:41:04,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-11-07 16:41:04,860 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:41:04,860 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:41:04,860 INFO L423 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:41:04,861 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:41:04,861 INFO L82 PathProgramCache]: Analyzing trace with hash -1623734403, now seen corresponding path program 21 times [2018-11-07 16:41:04,861 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:41:04,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:41:04,862 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:41:04,862 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:41:04,862 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:41:04,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:41:05,593 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:41:05,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:41:05,594 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:41:05,594 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:41:05,594 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:41:05,594 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:41:05,594 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 16:41:05,602 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:41:05,602 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:41:05,621 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:41:05,621 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:41:05,623 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:41:05,653 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:41:05,654 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:41:09,405 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:41:09,424 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:41:09,424 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-11-07 16:41:09,424 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:41:09,425 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-07 16:41:09,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-07 16:41:09,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 16:41:09,426 INFO L87 Difference]: Start difference. First operand 140 states and 142 transitions. Second operand 24 states. [2018-11-07 16:41:10,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:41:10,255 INFO L93 Difference]: Finished difference Result 149 states and 151 transitions. [2018-11-07 16:41:10,257 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-07 16:41:10,257 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 74 [2018-11-07 16:41:10,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:41:10,259 INFO L225 Difference]: With dead ends: 149 [2018-11-07 16:41:10,259 INFO L226 Difference]: Without dead ends: 144 [2018-11-07 16:41:10,259 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 126 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 16:41:10,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2018-11-07 16:41:10,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 143. [2018-11-07 16:41:10,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2018-11-07 16:41:10,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2018-11-07 16:41:10,264 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 74 [2018-11-07 16:41:10,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:41:10,264 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2018-11-07 16:41:10,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-07 16:41:10,265 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2018-11-07 16:41:10,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-11-07 16:41:10,265 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:41:10,265 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:41:10,266 INFO L423 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:41:10,266 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:41:10,266 INFO L82 PathProgramCache]: Analyzing trace with hash -499371138, now seen corresponding path program 22 times [2018-11-07 16:41:10,266 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:41:10,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:41:10,267 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:41:10,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:41:10,267 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:41:10,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:41:10,932 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:41:10,932 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:41:10,932 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:41:10,932 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:41:10,933 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:41:10,933 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:41:10,933 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 16:41:10,944 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:41:10,944 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:41:10,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:41:10,969 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:41:11,015 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:41:11,015 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:41:15,158 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:41:15,177 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:41:15,177 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-11-07 16:41:15,177 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:41:15,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-07 16:41:15,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-07 16:41:15,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 16:41:15,178 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand 25 states. [2018-11-07 16:41:16,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:41:16,084 INFO L93 Difference]: Finished difference Result 152 states and 154 transitions. [2018-11-07 16:41:16,084 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-07 16:41:16,084 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 77 [2018-11-07 16:41:16,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:41:16,086 INFO L225 Difference]: With dead ends: 152 [2018-11-07 16:41:16,086 INFO L226 Difference]: Without dead ends: 147 [2018-11-07 16:41:16,086 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 131 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 16:41:16,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-11-07 16:41:16,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 146. [2018-11-07 16:41:16,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2018-11-07 16:41:16,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 148 transitions. [2018-11-07 16:41:16,092 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 148 transitions. Word has length 77 [2018-11-07 16:41:16,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:41:16,092 INFO L480 AbstractCegarLoop]: Abstraction has 146 states and 148 transitions. [2018-11-07 16:41:16,092 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-07 16:41:16,092 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 148 transitions. [2018-11-07 16:41:16,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-11-07 16:41:16,093 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:41:16,093 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:41:16,094 INFO L423 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:41:16,094 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:41:16,094 INFO L82 PathProgramCache]: Analyzing trace with hash -2140204098, now seen corresponding path program 22 times [2018-11-07 16:41:16,094 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:41:16,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:41:16,095 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:41:16,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:41:16,095 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:41:16,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:41:16,747 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:41:16,748 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:41:16,748 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:41:16,748 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:41:16,748 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:41:16,748 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:41:16,748 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 16:41:16,758 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:41:16,758 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:41:16,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:41:16,781 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:41:16,819 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:41:16,819 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:41:20,560 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:41:20,580 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:41:20,580 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-11-07 16:41:20,580 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:41:20,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-07 16:41:20,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-07 16:41:20,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 16:41:20,581 INFO L87 Difference]: Start difference. First operand 146 states and 148 transitions. Second operand 25 states. [2018-11-07 16:41:21,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:41:21,350 INFO L93 Difference]: Finished difference Result 155 states and 157 transitions. [2018-11-07 16:41:21,351 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-07 16:41:21,351 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 77 [2018-11-07 16:41:21,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:41:21,352 INFO L225 Difference]: With dead ends: 155 [2018-11-07 16:41:21,352 INFO L226 Difference]: Without dead ends: 150 [2018-11-07 16:41:21,353 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 131 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 16:41:21,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-11-07 16:41:21,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 149. [2018-11-07 16:41:21,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-11-07 16:41:21,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 151 transitions. [2018-11-07 16:41:21,358 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 151 transitions. Word has length 77 [2018-11-07 16:41:21,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:41:21,359 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 151 transitions. [2018-11-07 16:41:21,359 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-07 16:41:21,359 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 151 transitions. [2018-11-07 16:41:21,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-11-07 16:41:21,360 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:41:21,360 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:41:21,360 INFO L423 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:41:21,360 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:41:21,360 INFO L82 PathProgramCache]: Analyzing trace with hash -164158053, now seen corresponding path program 23 times [2018-11-07 16:41:21,360 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:41:21,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:41:21,361 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:41:21,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:41:21,361 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:41:21,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:41:21,855 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:41:21,855 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:41:21,855 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:41:21,855 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:41:21,855 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:41:21,855 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:41:21,855 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 16:41:21,864 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:41:21,864 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:41:46,262 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-11-07 16:41:46,263 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:41:46,310 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:41:46,365 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:41:46,366 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:42:16,730 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:42:16,749 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:42:16,750 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 27] total 51 [2018-11-07 16:42:16,750 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:42:16,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-07 16:42:16,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-07 16:42:16,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=700, Invalid=1841, Unknown=9, NotChecked=0, Total=2550 [2018-11-07 16:42:16,751 INFO L87 Difference]: Start difference. First operand 149 states and 151 transitions. Second operand 26 states. [2018-11-07 16:42:17,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:42:17,720 INFO L93 Difference]: Finished difference Result 158 states and 160 transitions. [2018-11-07 16:42:17,720 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-07 16:42:17,720 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 80 [2018-11-07 16:42:17,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:42:17,721 INFO L225 Difference]: With dead ends: 158 [2018-11-07 16:42:17,721 INFO L226 Difference]: Without dead ends: 153 [2018-11-07 16:42:17,722 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 134 SyntacticMatches, 3 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 30.8s TimeCoverageRelationStatistics Valid=700, Invalid=1841, Unknown=9, NotChecked=0, Total=2550 [2018-11-07 16:42:17,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2018-11-07 16:42:17,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 152. [2018-11-07 16:42:17,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2018-11-07 16:42:17,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 154 transitions. [2018-11-07 16:42:17,727 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 154 transitions. Word has length 80 [2018-11-07 16:42:17,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:42:17,728 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 154 transitions. [2018-11-07 16:42:17,728 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-07 16:42:17,728 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 154 transitions. [2018-11-07 16:42:17,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-11-07 16:42:17,729 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:42:17,729 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:42:17,729 INFO L423 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:42:17,729 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:42:17,729 INFO L82 PathProgramCache]: Analyzing trace with hash 578933725, now seen corresponding path program 23 times [2018-11-07 16:42:17,730 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:42:17,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:42:17,730 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:42:17,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:42:17,730 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:42:17,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:42:18,232 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:42:18,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:42:18,233 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:42:18,233 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:42:18,233 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:42:18,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:42:18,233 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 16:42:18,241 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:42:18,241 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