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-invgen/half_2_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 16:43:20,839 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 16:43:20,842 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 16:43:20,854 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 16:43:20,855 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 16:43:20,856 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 16:43:20,857 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 16:43:20,859 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 16:43:20,861 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 16:43:20,862 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 16:43:20,863 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 16:43:20,863 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 16:43:20,864 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 16:43:20,865 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 16:43:20,866 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 16:43:20,867 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 16:43:20,868 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 16:43:20,870 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 16:43:20,872 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 16:43:20,874 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 16:43:20,875 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 16:43:20,877 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 16:43:20,879 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 16:43:20,880 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 16:43:20,880 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 16:43:20,881 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 16:43:20,882 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 16:43:20,883 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 16:43:20,884 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 16:43:20,885 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 16:43:20,885 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 16:43:20,886 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-11-07 16:43:20,888 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 16:43:20,909 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 16:43:20,909 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 16:43:20,910 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 16:43:20,911 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 16:43:20,911 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 16:43:20,911 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 16:43:20,911 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 16:43:20,911 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 16:43:20,912 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 16:43:20,912 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 16:43:20,912 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 16:43:20,913 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 16:43:20,913 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 16:43:20,914 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 16:43:20,915 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 16:43:20,915 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 16:43:20,915 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 16:43:20,915 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 16:43:20,915 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 16:43:20,915 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 16:43:20,916 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 16:43:20,916 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 16:43:20,916 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 16:43:20,916 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 16:43:20,916 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 16:43:20,918 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 16:43:20,918 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 16:43:20,918 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 16:43:20,919 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 16:43:20,919 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 16:43:20,919 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 16:43:20,919 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 16:43:20,920 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 16:43:20,920 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 16:43:20,977 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 16:43:20,990 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 16:43:20,994 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 16:43:20,996 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 16:43:20,996 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 16:43:20,997 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/half_2_true-unreach-call_true-termination.i [2018-11-07 16:43:21,058 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0ffbf3e0a/d126374f07f64f7eb17732d2aa20755e/FLAGf1f86015d [2018-11-07 16:43:21,548 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 16:43:21,549 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/half_2_true-unreach-call_true-termination.i [2018-11-07 16:43:21,554 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0ffbf3e0a/d126374f07f64f7eb17732d2aa20755e/FLAGf1f86015d [2018-11-07 16:43:21,569 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0ffbf3e0a/d126374f07f64f7eb17732d2aa20755e [2018-11-07 16:43:21,582 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 16:43:21,583 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 16:43:21,584 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 16:43:21,585 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 16:43:21,589 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 16:43:21,590 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:43:21" (1/1) ... [2018-11-07 16:43:21,593 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1a0ae1ff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:43:21, skipping insertion in model container [2018-11-07 16:43:21,593 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:43:21" (1/1) ... [2018-11-07 16:43:21,604 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 16:43:21,626 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 16:43:21,818 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 16:43:21,822 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 16:43:21,837 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 16:43:21,855 INFO L193 MainTranslator]: Completed translation [2018-11-07 16:43:21,856 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:43:21 WrapperNode [2018-11-07 16:43:21,856 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 16:43:21,857 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 16:43:21,857 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 16:43:21,857 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 16:43:21,867 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:43:21" (1/1) ... [2018-11-07 16:43:21,873 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:43:21" (1/1) ... [2018-11-07 16:43:21,880 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 16:43:21,880 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 16:43:21,880 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 16:43:21,881 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 16:43:21,892 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:43:21" (1/1) ... [2018-11-07 16:43:21,892 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:43:21" (1/1) ... [2018-11-07 16:43:21,893 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:43:21" (1/1) ... [2018-11-07 16:43:21,893 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:43:21" (1/1) ... [2018-11-07 16:43:21,898 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:43:21" (1/1) ... [2018-11-07 16:43:21,905 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:43:21" (1/1) ... [2018-11-07 16:43:21,908 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:43:21" (1/1) ... [2018-11-07 16:43:21,910 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 16:43:21,910 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 16:43:21,911 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 16:43:21,911 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 16:43:21,917 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:43:21" (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 16:43:22,039 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 16:43:22,039 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 16:43:22,039 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 16:43:22,039 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 16:43:22,039 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 16:43:22,040 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 16:43:22,040 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 16:43:22,040 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 16:43:22,381 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 16:43:22,382 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:43:22 BoogieIcfgContainer [2018-11-07 16:43:22,383 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 16:43:22,384 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 16:43:22,384 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 16:43:22,387 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 16:43:22,388 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 04:43:21" (1/3) ... [2018-11-07 16:43:22,389 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1249dd0e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:43:22, skipping insertion in model container [2018-11-07 16:43:22,389 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:43:21" (2/3) ... [2018-11-07 16:43:22,389 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1249dd0e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:43:22, skipping insertion in model container [2018-11-07 16:43:22,389 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:43:22" (3/3) ... [2018-11-07 16:43:22,391 INFO L112 eAbstractionObserver]: Analyzing ICFG half_2_true-unreach-call_true-termination.i [2018-11-07 16:43:22,400 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 16:43:22,406 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 16:43:22,423 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 16:43:22,458 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 16:43:22,458 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 16:43:22,458 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 16:43:22,459 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 16:43:22,459 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 16:43:22,459 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 16:43:22,459 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 16:43:22,459 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 16:43:22,478 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2018-11-07 16:43:22,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-11-07 16:43:22,485 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:43:22,486 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:43:22,488 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:43:22,493 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:43:22,493 INFO L82 PathProgramCache]: Analyzing trace with hash 123572206, now seen corresponding path program 1 times [2018-11-07 16:43:22,496 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:43:22,543 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:22,543 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:43:22,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:22,544 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:43:22,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:22,609 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 16:43:22,611 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 16:43:22,612 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 16:43:22,612 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 16:43:22,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 16:43:22,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 16:43:22,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 16:43:22,632 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 2 states. [2018-11-07 16:43:22,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:43:22,654 INFO L93 Difference]: Finished difference Result 40 states and 48 transitions. [2018-11-07 16:43:22,655 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 16:43:22,656 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 14 [2018-11-07 16:43:22,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:43:22,666 INFO L225 Difference]: With dead ends: 40 [2018-11-07 16:43:22,666 INFO L226 Difference]: Without dead ends: 19 [2018-11-07 16:43:22,670 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 16:43:22,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-11-07 16:43:22,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-11-07 16:43:22,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-11-07 16:43:22,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-11-07 16:43:22,723 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2018-11-07 16:43:22,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:43:22,724 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-11-07 16:43:22,724 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 16:43:22,725 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-11-07 16:43:22,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-11-07 16:43:22,726 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:43:22,727 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:43:22,727 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:43:22,727 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:43:22,728 INFO L82 PathProgramCache]: Analyzing trace with hash -204041864, now seen corresponding path program 1 times [2018-11-07 16:43:22,728 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:43:22,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:22,730 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:43:22,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:22,731 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:43:22,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:23,033 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 16:43:23,033 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 16:43:23,033 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-07 16:43:23,033 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 16:43:23,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-07 16:43:23,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-07 16:43:23,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-07 16:43:23,036 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 5 states. [2018-11-07 16:43:23,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:43:23,199 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2018-11-07 16:43:23,200 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 16:43:23,200 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-11-07 16:43:23,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:43:23,201 INFO L225 Difference]: With dead ends: 34 [2018-11-07 16:43:23,201 INFO L226 Difference]: Without dead ends: 21 [2018-11-07 16:43:23,203 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-11-07 16:43:23,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-11-07 16:43:23,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-11-07 16:43:23,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-07 16:43:23,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-11-07 16:43:23,209 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 15 [2018-11-07 16:43:23,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:43:23,210 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-11-07 16:43:23,210 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-07 16:43:23,210 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-11-07 16:43:23,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-11-07 16:43:23,211 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:43:23,211 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:43:23,212 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:43:23,212 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:43:23,212 INFO L82 PathProgramCache]: Analyzing trace with hash 615296882, now seen corresponding path program 1 times [2018-11-07 16:43:23,212 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:43:23,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:23,214 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:43:23,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:23,214 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:43:23,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:23,581 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 16:43:23,581 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:23,581 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:43:23,587 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 18 with the following transitions: [2018-11-07 16:43:23,589 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [16], [18], [22], [26], [32], [40], [43], [45], [51], [52], [53], [55] [2018-11-07 16:43:23,640 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 16:43:23,640 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 16:43:23,776 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 16:43:24,004 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 16:43:24,006 INFO L272 AbstractInterpreter]: Visited 16 different actions 80 times. Merged at 6 different actions 39 times. Widened at 2 different actions 5 times. Found 2 fixpoints after 2 different actions. Largest state had 6 variables. [2018-11-07 16:43:24,049 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:43:24,051 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 16:43:24,051 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:24,052 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 16:43:24,073 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:43:24,073 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:43:24,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:24,115 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:43:24,256 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 16:43:24,257 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:43:24,615 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2018-11-07 16:43:24,739 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 16:43:24,769 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:43:24,769 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-11-07 16:43:24,770 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:43:24,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 16:43:24,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 16:43:24,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2018-11-07 16:43:24,772 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 9 states. [2018-11-07 16:43:25,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:43:25,358 INFO L93 Difference]: Finished difference Result 38 states and 41 transitions. [2018-11-07 16:43:25,358 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 16:43:25,358 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 17 [2018-11-07 16:43:25,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:43:25,359 INFO L225 Difference]: With dead ends: 38 [2018-11-07 16:43:25,359 INFO L226 Difference]: Without dead ends: 23 [2018-11-07 16:43:25,361 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 26 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2018-11-07 16:43:25,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-11-07 16:43:25,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-11-07 16:43:25,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-11-07 16:43:25,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-11-07 16:43:25,366 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 17 [2018-11-07 16:43:25,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:43:25,367 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-11-07 16:43:25,367 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 16:43:25,367 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-11-07 16:43:25,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-07 16:43:25,368 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:43:25,368 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:43:25,368 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:43:25,369 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:43:25,369 INFO L82 PathProgramCache]: Analyzing trace with hash 2020816620, now seen corresponding path program 2 times [2018-11-07 16:43:25,369 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:43:25,370 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:25,370 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:43:25,370 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:25,371 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:43:25,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:25,517 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:43:25,518 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:25,518 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:43:25,519 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:43:25,519 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:43:25,519 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:25,520 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:43:25,538 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:43:25,538 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:43:25,579 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 16:43:25,580 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:43:25,582 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:43:25,655 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:43:25,656 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:43:25,785 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:43:25,805 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:43:25,805 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-11-07 16:43:25,805 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:43:25,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 16:43:25,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 16:43:25,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2018-11-07 16:43:25,807 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 9 states. [2018-11-07 16:43:25,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:43:25,937 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2018-11-07 16:43:25,938 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-07 16:43:25,938 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2018-11-07 16:43:25,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:43:25,940 INFO L225 Difference]: With dead ends: 37 [2018-11-07 16:43:25,941 INFO L226 Difference]: Without dead ends: 35 [2018-11-07 16:43:25,941 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2018-11-07 16:43:25,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-11-07 16:43:25,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2018-11-07 16:43:25,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-07 16:43:25,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-11-07 16:43:25,952 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 19 [2018-11-07 16:43:25,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:43:25,952 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-11-07 16:43:25,952 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 16:43:25,952 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-11-07 16:43:25,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-11-07 16:43:25,953 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:43:25,953 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:43:25,954 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:43:25,954 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:43:25,954 INFO L82 PathProgramCache]: Analyzing trace with hash 214509359, now seen corresponding path program 1 times [2018-11-07 16:43:25,954 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:43:25,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:25,955 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:43:25,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:25,955 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:43:25,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:26,433 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:43:26,433 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:26,433 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:43:26,433 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 28 with the following transitions: [2018-11-07 16:43:26,434 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [16], [18], [22], [26], [32], [34], [40], [43], [45], [48], [50], [51], [52], [53], [55], [56] [2018-11-07 16:43:26,435 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 16:43:26,435 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 16:43:26,453 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 16:43:26,723 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 16:43:26,723 INFO L272 AbstractInterpreter]: Visited 20 different actions 130 times. Merged at 8 different actions 55 times. Widened at 3 different actions 7 times. Found 9 fixpoints after 4 different actions. Largest state had 8 variables. [2018-11-07 16:43:26,763 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:43:26,763 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 16:43:26,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:26,763 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 16:43:26,779 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:43:26,780 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:43:26,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:26,806 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:43:27,374 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:43:27,375 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:43:28,027 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:43:28,047 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:43:28,048 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 25 [2018-11-07 16:43:28,048 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:43:28,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-07 16:43:28,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-07 16:43:28,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=508, Unknown=0, NotChecked=0, Total=600 [2018-11-07 16:43:28,049 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 18 states. [2018-11-07 16:43:28,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:43:28,514 INFO L93 Difference]: Finished difference Result 55 states and 58 transitions. [2018-11-07 16:43:28,521 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-07 16:43:28,521 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 27 [2018-11-07 16:43:28,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:43:28,524 INFO L225 Difference]: With dead ends: 55 [2018-11-07 16:43:28,524 INFO L226 Difference]: Without dead ends: 32 [2018-11-07 16:43:28,525 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 38 SyntacticMatches, 6 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=146, Invalid=784, Unknown=0, NotChecked=0, Total=930 [2018-11-07 16:43:28,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-11-07 16:43:28,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-11-07 16:43:28,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-11-07 16:43:28,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2018-11-07 16:43:28,531 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 27 [2018-11-07 16:43:28,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:43:28,532 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2018-11-07 16:43:28,532 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-07 16:43:28,532 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2018-11-07 16:43:28,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-11-07 16:43:28,533 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:43:28,533 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:43:28,533 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:43:28,534 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:43:28,534 INFO L82 PathProgramCache]: Analyzing trace with hash 1884298793, now seen corresponding path program 2 times [2018-11-07 16:43:28,534 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:43:28,535 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:28,535 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:43:28,535 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:28,535 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:43:28,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:28,749 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:43:28,749 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:28,750 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:43:28,750 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:43:28,750 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:43:28,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:28,751 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 16:43:28,760 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:43:28,760 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:43:28,775 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-11-07 16:43:28,775 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:43:28,778 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:43:28,914 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:43:28,914 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:43:29,112 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:43:29,133 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:43:29,133 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 20 [2018-11-07 16:43:29,133 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:43:29,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-07 16:43:29,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-07 16:43:29,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2018-11-07 16:43:29,134 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand 15 states. [2018-11-07 16:43:29,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:43:29,523 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2018-11-07 16:43:29,523 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 16:43:29,524 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 29 [2018-11-07 16:43:29,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:43:29,526 INFO L225 Difference]: With dead ends: 47 [2018-11-07 16:43:29,526 INFO L226 Difference]: Without dead ends: 45 [2018-11-07 16:43:29,527 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 46 SyntacticMatches, 5 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=532, Unknown=0, NotChecked=0, Total=650 [2018-11-07 16:43:29,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-11-07 16:43:29,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 40. [2018-11-07 16:43:29,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-11-07 16:43:29,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2018-11-07 16:43:29,535 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 29 [2018-11-07 16:43:29,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:43:29,536 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2018-11-07 16:43:29,536 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-07 16:43:29,536 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2018-11-07 16:43:29,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-11-07 16:43:29,537 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:43:29,538 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:43:29,538 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:43:29,538 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:43:29,538 INFO L82 PathProgramCache]: Analyzing trace with hash 2099085676, now seen corresponding path program 3 times [2018-11-07 16:43:29,538 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:43:29,539 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:29,540 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:43:29,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:29,540 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:43:29,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:29,893 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 7 proven. 22 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-07 16:43:29,893 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:29,894 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:43:29,894 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:43:29,894 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:43:29,894 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:29,894 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 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 16:43:29,905 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:43:29,905 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:43:29,931 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:43:29,931 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:43:29,935 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:43:30,535 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-07 16:43:30,536 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:43:31,097 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-07 16:43:31,117 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:43:31,118 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 31 [2018-11-07 16:43:31,118 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:43:31,118 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-07 16:43:31,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-07 16:43:31,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2018-11-07 16:43:31,121 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 22 states. [2018-11-07 16:43:31,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:43:31,931 INFO L93 Difference]: Finished difference Result 79 states and 84 transitions. [2018-11-07 16:43:31,931 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 16:43:31,931 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 37 [2018-11-07 16:43:31,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:43:31,932 INFO L225 Difference]: With dead ends: 79 [2018-11-07 16:43:31,933 INFO L226 Difference]: Without dead ends: 52 [2018-11-07 16:43:31,934 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 54 SyntacticMatches, 6 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=205, Invalid=1201, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 16:43:31,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-11-07 16:43:31,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 42. [2018-11-07 16:43:31,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-11-07 16:43:31,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-11-07 16:43:31,941 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 37 [2018-11-07 16:43:31,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:43:31,941 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-11-07 16:43:31,941 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-07 16:43:31,941 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-11-07 16:43:31,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-11-07 16:43:31,942 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:43:31,942 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:43:31,942 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:43:31,943 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:43:31,943 INFO L82 PathProgramCache]: Analyzing trace with hash -599816218, now seen corresponding path program 4 times [2018-11-07 16:43:31,943 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:43:31,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:31,944 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:43:31,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:31,944 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:43:31,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:32,108 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 15 proven. 22 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-07 16:43:32,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:32,108 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:43:32,108 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:43:32,108 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:43:32,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:32,109 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:43:32,117 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:43:32,118 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:43:32,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:32,132 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:43:32,291 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 16:43:32,291 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:43:32,397 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 16:43:32,417 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:43:32,417 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 22 [2018-11-07 16:43:32,417 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:43:32,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-07 16:43:32,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-07 16:43:32,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2018-11-07 16:43:32,419 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 18 states. [2018-11-07 16:43:32,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:43:32,718 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2018-11-07 16:43:32,718 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 16:43:32,719 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 39 [2018-11-07 16:43:32,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:43:32,721 INFO L225 Difference]: With dead ends: 57 [2018-11-07 16:43:32,721 INFO L226 Difference]: Without dead ends: 55 [2018-11-07 16:43:32,722 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 67 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=164, Invalid=706, Unknown=0, NotChecked=0, Total=870 [2018-11-07 16:43:32,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-11-07 16:43:32,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 50. [2018-11-07 16:43:32,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-11-07 16:43:32,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2018-11-07 16:43:32,729 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 39 [2018-11-07 16:43:32,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:43:32,730 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2018-11-07 16:43:32,730 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-07 16:43:32,730 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2018-11-07 16:43:32,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-11-07 16:43:32,731 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:43:32,731 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:43:32,732 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:43:32,732 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:43:32,732 INFO L82 PathProgramCache]: Analyzing trace with hash 303685161, now seen corresponding path program 5 times [2018-11-07 16:43:32,732 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:43:32,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:32,733 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:43:32,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:32,733 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:43:32,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:33,385 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 17 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-07 16:43:33,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:33,385 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:43:33,385 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:43:33,386 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:43:33,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:33,386 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 16:43:33,399 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:43:33,399 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:43:33,436 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-11-07 16:43:33,437 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:43:33,440 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:43:33,772 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 11 proven. 42 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-07 16:43:33,772 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:43:34,320 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 11 proven. 42 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-07 16:43:34,341 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:43:34,341 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 16] total 39 [2018-11-07 16:43:34,341 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:43:34,342 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-07 16:43:34,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-07 16:43:34,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1311, Unknown=0, NotChecked=0, Total=1482 [2018-11-07 16:43:34,343 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand 28 states. [2018-11-07 16:43:35,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:43:35,384 INFO L93 Difference]: Finished difference Result 79 states and 85 transitions. [2018-11-07 16:43:35,384 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-07 16:43:35,384 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 47 [2018-11-07 16:43:35,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:43:35,386 INFO L225 Difference]: With dead ends: 79 [2018-11-07 16:43:35,386 INFO L226 Difference]: Without dead ends: 52 [2018-11-07 16:43:35,390 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 69 SyntacticMatches, 5 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 608 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=324, Invalid=2538, Unknown=0, NotChecked=0, Total=2862 [2018-11-07 16:43:35,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-11-07 16:43:35,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-11-07 16:43:35,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-11-07 16:43:35,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2018-11-07 16:43:35,403 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 47 [2018-11-07 16:43:35,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:43:35,404 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2018-11-07 16:43:35,404 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-07 16:43:35,404 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2018-11-07 16:43:35,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-11-07 16:43:35,405 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:43:35,405 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:43:35,409 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:43:35,409 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:43:35,409 INFO L82 PathProgramCache]: Analyzing trace with hash -1075211229, now seen corresponding path program 6 times [2018-11-07 16:43:35,410 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:43:35,410 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:35,410 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:43:35,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:35,411 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:43:35,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:35,602 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 25 proven. 38 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-07 16:43:35,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:35,603 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:43:35,603 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:43:35,603 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:43:35,603 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:35,603 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 16:43:35,614 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:43:35,615 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:43:35,629 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:43:35,629 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:43:35,632 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:43:35,830 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 5 proven. 58 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-07 16:43:35,831 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:43:36,012 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 5 proven. 58 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-07 16:43:36,034 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:43:36,034 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 15] total 28 [2018-11-07 16:43:36,034 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:43:36,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-07 16:43:36,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-07 16:43:36,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=636, Unknown=0, NotChecked=0, Total=756 [2018-11-07 16:43:36,036 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand 21 states. [2018-11-07 16:43:36,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:43:36,361 INFO L93 Difference]: Finished difference Result 67 states and 69 transitions. [2018-11-07 16:43:36,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-07 16:43:36,361 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2018-11-07 16:43:36,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:43:36,363 INFO L225 Difference]: With dead ends: 67 [2018-11-07 16:43:36,363 INFO L226 Difference]: Without dead ends: 65 [2018-11-07 16:43:36,365 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 80 SyntacticMatches, 7 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=245, Invalid=1161, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 16:43:36,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-11-07 16:43:36,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 60. [2018-11-07 16:43:36,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-11-07 16:43:36,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-11-07 16:43:36,373 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 49 [2018-11-07 16:43:36,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:43:36,373 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-11-07 16:43:36,373 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-07 16:43:36,373 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-11-07 16:43:36,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-11-07 16:43:36,374 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:43:36,375 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:43:36,375 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:43:36,375 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:43:36,375 INFO L82 PathProgramCache]: Analyzing trace with hash 893803878, now seen corresponding path program 7 times [2018-11-07 16:43:36,375 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:43:36,376 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:36,376 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:43:36,376 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:36,376 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:43:36,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:36,798 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 31 proven. 52 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 16:43:36,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:36,799 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:43:36,799 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:43:36,799 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:43:36,799 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:36,799 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 16:43:36,808 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:43:36,808 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:43:36,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:36,842 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:43:37,288 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 7 proven. 76 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 16:43:37,288 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:43:38,212 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 7 proven. 76 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 16:43:38,234 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:43:38,234 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 43 [2018-11-07 16:43:38,234 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:43:38,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-11-07 16:43:38,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-11-07 16:43:38,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=1564, Unknown=0, NotChecked=0, Total=1806 [2018-11-07 16:43:38,236 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 30 states. [2018-11-07 16:43:39,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:43:39,401 INFO L93 Difference]: Finished difference Result 115 states and 120 transitions. [2018-11-07 16:43:39,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-07 16:43:39,402 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 57 [2018-11-07 16:43:39,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:43:39,404 INFO L225 Difference]: With dead ends: 115 [2018-11-07 16:43:39,404 INFO L226 Difference]: Without dead ends: 72 [2018-11-07 16:43:39,406 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 86 SyntacticMatches, 6 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 701 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=362, Invalid=2290, Unknown=0, NotChecked=0, Total=2652 [2018-11-07 16:43:39,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-11-07 16:43:39,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 62. [2018-11-07 16:43:39,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-11-07 16:43:39,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2018-11-07 16:43:39,414 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 57 [2018-11-07 16:43:39,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:43:39,414 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2018-11-07 16:43:39,414 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-11-07 16:43:39,414 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2018-11-07 16:43:39,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-11-07 16:43:39,415 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:43:39,416 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:43:39,416 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:43:39,416 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:43:39,416 INFO L82 PathProgramCache]: Analyzing trace with hash 1175347936, now seen corresponding path program 8 times [2018-11-07 16:43:39,416 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:43:39,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:39,417 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:43:39,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:39,417 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:43:39,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:39,734 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 37 proven. 58 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 16:43:39,734 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:39,734 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:43:39,734 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:43:39,734 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:43:39,734 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:39,735 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 16:43:39,743 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:43:39,744 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:43:39,765 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-11-07 16:43:39,765 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:43:39,769 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:43:39,970 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 16:43:39,970 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:43:40,241 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 16:43:40,263 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:43:40,263 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 17] total 32 [2018-11-07 16:43:40,263 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:43:40,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-07 16:43:40,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-07 16:43:40,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=834, Unknown=0, NotChecked=0, Total=992 [2018-11-07 16:43:40,264 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand 24 states. [2018-11-07 16:43:40,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:43:40,728 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2018-11-07 16:43:40,728 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-07 16:43:40,729 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 59 [2018-11-07 16:43:40,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:43:40,730 INFO L225 Difference]: With dead ends: 77 [2018-11-07 16:43:40,731 INFO L226 Difference]: Without dead ends: 75 [2018-11-07 16:43:40,732 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 97 SyntacticMatches, 8 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=337, Invalid=1555, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 16:43:40,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-11-07 16:43:40,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 70. [2018-11-07 16:43:40,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-11-07 16:43:40,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2018-11-07 16:43:40,740 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 59 [2018-11-07 16:43:40,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:43:40,741 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2018-11-07 16:43:40,741 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-07 16:43:40,741 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2018-11-07 16:43:40,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-11-07 16:43:40,742 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:43:40,742 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:43:40,743 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:43:40,743 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:43:40,743 INFO L82 PathProgramCache]: Analyzing trace with hash -549249245, now seen corresponding path program 9 times [2018-11-07 16:43:40,743 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:43:40,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:40,744 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:43:40,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:40,744 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:43:40,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:41,210 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 49 proven. 70 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-07 16:43:41,210 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:41,210 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:43:41,211 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:43:41,211 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:43:41,211 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:41,211 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 16:43:41,219 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:43:41,219 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:43:41,241 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:43:41,241 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:43:41,245 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:43:41,736 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 21 proven. 98 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-07 16:43:41,737 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:43:43,512 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 21 proven. 98 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-07 16:43:43,532 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:43:43,532 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 49 [2018-11-07 16:43:43,532 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:43:43,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-11-07 16:43:43,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-11-07 16:43:43,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=2046, Unknown=0, NotChecked=0, Total=2352 [2018-11-07 16:43:43,534 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand 34 states. [2018-11-07 16:43:44,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:43:44,694 INFO L93 Difference]: Finished difference Result 133 states and 138 transitions. [2018-11-07 16:43:44,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-07 16:43:44,695 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 67 [2018-11-07 16:43:44,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:43:44,697 INFO L225 Difference]: With dead ends: 133 [2018-11-07 16:43:44,697 INFO L226 Difference]: Without dead ends: 82 [2018-11-07 16:43:44,700 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 102 SyntacticMatches, 6 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 924 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=454, Invalid=2968, Unknown=0, NotChecked=0, Total=3422 [2018-11-07 16:43:44,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-11-07 16:43:44,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 72. [2018-11-07 16:43:44,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-11-07 16:43:44,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2018-11-07 16:43:44,709 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 67 [2018-11-07 16:43:44,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:43:44,710 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2018-11-07 16:43:44,710 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-11-07 16:43:44,710 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2018-11-07 16:43:44,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-11-07 16:43:44,711 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:43:44,712 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:43:44,712 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:43:44,712 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:43:44,712 INFO L82 PathProgramCache]: Analyzing trace with hash 42341405, now seen corresponding path program 10 times [2018-11-07 16:43:44,712 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:43:44,713 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:44,713 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:43:44,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:44,714 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:43:44,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:45,450 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 51 proven. 82 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-07 16:43:45,450 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:45,450 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:43:45,451 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:43:45,451 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:43:45,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:45,451 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 16:43:45,460 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:43:45,460 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:43:45,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:45,484 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:43:46,400 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 10 proven. 111 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 16:43:46,400 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:43:46,996 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 10 proven. 111 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 16:43:47,015 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:43:47,016 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 34 [2018-11-07 16:43:47,016 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:43:47,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-11-07 16:43:47,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-11-07 16:43:47,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=935, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 16:43:47,017 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 27 states. [2018-11-07 16:43:48,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:43:48,491 INFO L93 Difference]: Finished difference Result 87 states and 89 transitions. [2018-11-07 16:43:48,491 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-07 16:43:48,491 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 69 [2018-11-07 16:43:48,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:43:48,492 INFO L225 Difference]: With dead ends: 87 [2018-11-07 16:43:48,492 INFO L226 Difference]: Without dead ends: 85 [2018-11-07 16:43:48,493 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 118 SyntacticMatches, 7 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 646 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=413, Invalid=1843, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 16:43:48,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-11-07 16:43:48,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 80. [2018-11-07 16:43:48,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-11-07 16:43:48,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2018-11-07 16:43:48,501 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 69 [2018-11-07 16:43:48,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:43:48,501 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2018-11-07 16:43:48,501 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-11-07 16:43:48,502 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2018-11-07 16:43:48,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-11-07 16:43:48,503 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:43:48,503 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:43:48,503 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:43:48,503 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:43:48,504 INFO L82 PathProgramCache]: Analyzing trace with hash -641186976, now seen corresponding path program 11 times [2018-11-07 16:43:48,504 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:43:48,504 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:48,505 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:43:48,505 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:48,505 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:43:48,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:49,248 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 71 proven. 90 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 16:43:49,248 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:49,248 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:43:49,249 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:43:49,249 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:43:49,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:49,249 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 16:43:49,264 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:43:49,264 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:43:49,375 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-11-07 16:43:49,376 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:43:49,380 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:43:50,392 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 26 proven. 135 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 16:43:50,393 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:43:51,242 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 26 proven. 135 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 16:43:51,262 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:43:51,263 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 22] total 56 [2018-11-07 16:43:51,263 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:43:51,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-11-07 16:43:51,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-11-07 16:43:51,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=2700, Unknown=0, NotChecked=0, Total=3080 [2018-11-07 16:43:51,265 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand 39 states. [2018-11-07 16:43:52,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:43:52,174 INFO L93 Difference]: Finished difference Result 121 states and 130 transitions. [2018-11-07 16:43:52,175 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-11-07 16:43:52,175 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 77 [2018-11-07 16:43:52,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:43:52,176 INFO L225 Difference]: With dead ends: 121 [2018-11-07 16:43:52,177 INFO L226 Difference]: Without dead ends: 82 [2018-11-07 16:43:52,180 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 118 SyntacticMatches, 5 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1536 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=553, Invalid=4003, Unknown=0, NotChecked=0, Total=4556 [2018-11-07 16:43:52,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-11-07 16:43:52,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2018-11-07 16:43:52,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-11-07 16:43:52,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2018-11-07 16:43:52,188 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 77 [2018-11-07 16:43:52,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:43:52,188 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2018-11-07 16:43:52,188 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-11-07 16:43:52,188 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2018-11-07 16:43:52,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-11-07 16:43:52,190 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:43:52,190 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:43:52,190 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:43:52,190 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:43:52,190 INFO L82 PathProgramCache]: Analyzing trace with hash -1270822950, now seen corresponding path program 12 times [2018-11-07 16:43:52,190 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:43:52,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:52,191 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:43:52,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:52,192 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:43:52,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:52,668 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 67 proven. 110 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 16:43:52,669 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:52,669 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:43:52,669 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:43:52,669 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:43:52,669 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:52,669 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 16:43:52,677 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:43:52,678 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:43:52,698 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:43:52,699 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:43:52,702 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:43:52,934 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 11 proven. 166 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 16:43:52,934 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:43:53,793 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 11 proven. 166 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 16:43:53,814 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:43:53,814 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 21] total 40 [2018-11-07 16:43:53,814 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:43:53,815 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-11-07 16:43:53,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-11-07 16:43:53,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=1320, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 16:43:53,816 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand 30 states. [2018-11-07 16:43:54,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:43:54,471 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2018-11-07 16:43:54,472 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-07 16:43:54,472 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 79 [2018-11-07 16:43:54,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:43:54,474 INFO L225 Difference]: With dead ends: 97 [2018-11-07 16:43:54,474 INFO L226 Difference]: Without dead ends: 95 [2018-11-07 16:43:54,475 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 131 SyntacticMatches, 10 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 948 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=533, Invalid=2547, Unknown=0, NotChecked=0, Total=3080 [2018-11-07 16:43:54,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-11-07 16:43:54,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 90. [2018-11-07 16:43:54,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-11-07 16:43:54,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2018-11-07 16:43:54,484 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 79 [2018-11-07 16:43:54,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:43:54,484 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2018-11-07 16:43:54,484 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-11-07 16:43:54,484 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2018-11-07 16:43:54,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-11-07 16:43:54,485 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:43:54,486 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:43:54,486 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:43:54,486 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:43:54,486 INFO L82 PathProgramCache]: Analyzing trace with hash -2119833059, now seen corresponding path program 13 times [2018-11-07 16:43:54,486 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:43:54,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:54,487 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:43:54,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:54,487 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:43:54,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:56,065 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 97 proven. 112 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-07 16:43:56,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:56,066 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:43:56,066 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:43:56,066 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:43:56,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:56,066 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 16:43:56,075 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:43:56,076 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:43:56,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:56,104 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:43:56,680 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 13 proven. 196 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-07 16:43:56,680 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:43:57,752 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 13 proven. 196 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-07 16:43:57,772 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:43:57,772 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 61 [2018-11-07 16:43:57,772 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:43:57,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-11-07 16:43:57,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-11-07 16:43:57,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=473, Invalid=3187, Unknown=0, NotChecked=0, Total=3660 [2018-11-07 16:43:57,774 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand 42 states. [2018-11-07 16:43:59,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:43:59,036 INFO L93 Difference]: Finished difference Result 169 states and 174 transitions. [2018-11-07 16:43:59,036 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-11-07 16:43:59,036 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 87 [2018-11-07 16:43:59,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:43:59,038 INFO L225 Difference]: With dead ends: 169 [2018-11-07 16:43:59,039 INFO L226 Difference]: Without dead ends: 102 [2018-11-07 16:43:59,041 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 134 SyntacticMatches, 6 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1472 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=686, Invalid=4570, Unknown=0, NotChecked=0, Total=5256 [2018-11-07 16:43:59,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-11-07 16:43:59,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 92. [2018-11-07 16:43:59,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-11-07 16:43:59,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 93 transitions. [2018-11-07 16:43:59,049 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 93 transitions. Word has length 87 [2018-11-07 16:43:59,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:43:59,049 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 93 transitions. [2018-11-07 16:43:59,049 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-11-07 16:43:59,049 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 93 transitions. [2018-11-07 16:43:59,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-11-07 16:43:59,050 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:43:59,050 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:43:59,051 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:43:59,051 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:43:59,051 INFO L82 PathProgramCache]: Analyzing trace with hash -2025415145, now seen corresponding path program 14 times [2018-11-07 16:43:59,051 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:43:59,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:59,052 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:43:59,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:43:59,052 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:43:59,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:43:59,737 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 85 proven. 142 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-07 16:43:59,737 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:59,737 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:43:59,737 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:43:59,738 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:43:59,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:43:59,738 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:43:59,747 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:43:59,747 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:43:59,780 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-11-07 16:43:59,780 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:43:59,783 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:44:00,059 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 31 proven. 196 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-07 16:44:00,059 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:44:00,397 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 31 proven. 196 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-07 16:44:00,417 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:44:00,418 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 23] total 44 [2018-11-07 16:44:00,418 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:44:00,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-11-07 16:44:00,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-11-07 16:44:00,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=296, Invalid=1596, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 16:44:00,419 INFO L87 Difference]: Start difference. First operand 92 states and 93 transitions. Second operand 33 states. [2018-11-07 16:44:01,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:44:01,172 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2018-11-07 16:44:01,172 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-07 16:44:01,173 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 89 [2018-11-07 16:44:01,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:44:01,174 INFO L225 Difference]: With dead ends: 107 [2018-11-07 16:44:01,174 INFO L226 Difference]: Without dead ends: 105 [2018-11-07 16:44:01,177 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 148 SyntacticMatches, 11 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1184 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=673, Invalid=3109, Unknown=0, NotChecked=0, Total=3782 [2018-11-07 16:44:01,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-11-07 16:44:01,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 100. [2018-11-07 16:44:01,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-11-07 16:44:01,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2018-11-07 16:44:01,186 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 89 [2018-11-07 16:44:01,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:44:01,186 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2018-11-07 16:44:01,186 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-11-07 16:44:01,186 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2018-11-07 16:44:01,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-11-07 16:44:01,188 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:44:01,188 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:44:01,188 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:44:01,188 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:44:01,188 INFO L82 PathProgramCache]: Analyzing trace with hash 147075930, now seen corresponding path program 15 times [2018-11-07 16:44:01,188 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:44:01,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:01,189 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:44:01,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:01,189 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:44:01,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:44:01,951 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 127 proven. 136 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-07 16:44:01,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:01,951 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:44:01,951 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:44:01,951 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:44:01,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:01,951 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 16:44:01,962 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:44:01,962 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:44:01,993 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:44:01,993 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:44:01,998 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:44:02,766 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 36 proven. 227 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-07 16:44:02,767 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:44:04,183 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 36 proven. 227 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-07 16:44:04,203 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:44:04,203 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 67 [2018-11-07 16:44:04,203 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:44:04,204 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-11-07 16:44:04,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-11-07 16:44:04,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=3861, Unknown=0, NotChecked=0, Total=4422 [2018-11-07 16:44:04,205 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand 46 states. [2018-11-07 16:44:05,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:44:05,589 INFO L93 Difference]: Finished difference Result 187 states and 192 transitions. [2018-11-07 16:44:05,590 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-07 16:44:05,590 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 97 [2018-11-07 16:44:05,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:44:05,591 INFO L225 Difference]: With dead ends: 187 [2018-11-07 16:44:05,591 INFO L226 Difference]: Without dead ends: 112 [2018-11-07 16:44:05,592 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 150 SyntacticMatches, 6 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1779 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=811, Invalid=5509, Unknown=0, NotChecked=0, Total=6320 [2018-11-07 16:44:05,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-11-07 16:44:05,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 102. [2018-11-07 16:44:05,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-11-07 16:44:05,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 103 transitions. [2018-11-07 16:44:05,600 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 103 transitions. Word has length 97 [2018-11-07 16:44:05,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:44:05,600 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 103 transitions. [2018-11-07 16:44:05,600 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-11-07 16:44:05,600 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 103 transitions. [2018-11-07 16:44:05,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-11-07 16:44:05,601 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:44:05,602 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:44:05,602 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:44:05,602 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:44:05,602 INFO L82 PathProgramCache]: Analyzing trace with hash -692603180, now seen corresponding path program 16 times [2018-11-07 16:44:05,602 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:44:05,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:05,603 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:44:05,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:05,603 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:44:05,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:44:05,993 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 105 proven. 178 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-07 16:44:05,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:05,994 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:44:05,994 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:44:05,994 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:44:05,994 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:05,994 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 16:44:06,003 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:44:06,003 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:44:06,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:44:06,033 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:44:06,368 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 16 proven. 246 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 16:44:06,368 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:44:07,466 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 16 proven. 246 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 16:44:07,485 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:44:07,486 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 46 [2018-11-07 16:44:07,486 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:44:07,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-11-07 16:44:07,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-11-07 16:44:07,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=1733, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 16:44:07,487 INFO L87 Difference]: Start difference. First operand 102 states and 103 transitions. Second operand 36 states. [2018-11-07 16:44:08,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:44:08,341 INFO L93 Difference]: Finished difference Result 117 states and 119 transitions. [2018-11-07 16:44:08,342 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-07 16:44:08,342 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 99 [2018-11-07 16:44:08,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:44:08,343 INFO L225 Difference]: With dead ends: 117 [2018-11-07 16:44:08,343 INFO L226 Difference]: Without dead ends: 115 [2018-11-07 16:44:08,344 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 169 SyntacticMatches, 10 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1315 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=779, Invalid=3511, Unknown=0, NotChecked=0, Total=4290 [2018-11-07 16:44:08,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-11-07 16:44:08,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 110. [2018-11-07 16:44:08,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-11-07 16:44:08,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 111 transitions. [2018-11-07 16:44:08,352 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 111 transitions. Word has length 99 [2018-11-07 16:44:08,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:44:08,352 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 111 transitions. [2018-11-07 16:44:08,353 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-11-07 16:44:08,353 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 111 transitions. [2018-11-07 16:44:08,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-11-07 16:44:08,354 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:44:08,354 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:44:08,354 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:44:08,354 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:44:08,354 INFO L82 PathProgramCache]: Analyzing trace with hash 941834007, now seen corresponding path program 17 times [2018-11-07 16:44:08,355 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:44:08,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:08,355 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:44:08,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:08,356 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:44:08,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:44:09,442 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 161 proven. 162 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-07 16:44:09,443 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:09,443 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:44:09,443 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:44:09,443 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:44:09,443 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:09,443 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 16:44:09,453 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:44:09,454 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:44:09,492 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-11-07 16:44:09,492 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:44:09,496 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:44:10,194 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 41 proven. 282 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-07 16:44:10,194 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:44:11,393 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 41 proven. 282 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-07 16:44:11,415 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:44:11,415 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29, 28] total 74 [2018-11-07 16:44:11,416 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:44:11,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-11-07 16:44:11,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-11-07 16:44:11,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=4734, Unknown=0, NotChecked=0, Total=5402 [2018-11-07 16:44:11,417 INFO L87 Difference]: Start difference. First operand 110 states and 111 transitions. Second operand 51 states. [2018-11-07 16:44:13,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:44:13,301 INFO L93 Difference]: Finished difference Result 163 states and 175 transitions. [2018-11-07 16:44:13,301 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-11-07 16:44:13,301 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 107 [2018-11-07 16:44:13,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:44:13,303 INFO L225 Difference]: With dead ends: 163 [2018-11-07 16:44:13,303 INFO L226 Difference]: Without dead ends: 112 [2018-11-07 16:44:13,305 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 166 SyntacticMatches, 5 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2895 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=931, Invalid=6901, Unknown=0, NotChecked=0, Total=7832 [2018-11-07 16:44:13,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-11-07 16:44:13,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2018-11-07 16:44:13,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-11-07 16:44:13,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2018-11-07 16:44:13,314 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 107 [2018-11-07 16:44:13,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:44:13,314 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2018-11-07 16:44:13,314 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-11-07 16:44:13,314 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2018-11-07 16:44:13,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-07 16:44:13,315 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:44:13,316 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:44:13,316 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:44:13,316 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:44:13,316 INFO L82 PathProgramCache]: Analyzing trace with hash 1858875921, now seen corresponding path program 18 times [2018-11-07 16:44:13,316 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:44:13,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:13,317 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:44:13,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:13,317 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:44:13,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:44:14,572 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 127 proven. 218 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-07 16:44:14,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:14,573 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:44:14,573 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:44:14,573 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:44:14,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:14,573 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 16:44:14,582 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:44:14,582 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:44:14,615 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:44:14,615 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:44:14,619 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:44:14,982 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 17 proven. 328 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-07 16:44:14,982 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:44:15,472 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 17 proven. 328 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-07 16:44:15,494 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:44:15,494 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 27, 27] total 52 [2018-11-07 16:44:15,495 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:44:15,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-11-07 16:44:15,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-11-07 16:44:15,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=405, Invalid=2247, Unknown=0, NotChecked=0, Total=2652 [2018-11-07 16:44:15,496 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand 39 states. [2018-11-07 16:44:16,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:44:16,400 INFO L93 Difference]: Finished difference Result 127 states and 129 transitions. [2018-11-07 16:44:16,403 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-11-07 16:44:16,403 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 109 [2018-11-07 16:44:16,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:44:16,404 INFO L225 Difference]: With dead ends: 127 [2018-11-07 16:44:16,404 INFO L226 Difference]: Without dead ends: 125 [2018-11-07 16:44:16,405 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 182 SyntacticMatches, 13 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1737 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=938, Invalid=4464, Unknown=0, NotChecked=0, Total=5402 [2018-11-07 16:44:16,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2018-11-07 16:44:16,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 120. [2018-11-07 16:44:16,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-11-07 16:44:16,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 121 transitions. [2018-11-07 16:44:16,412 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 121 transitions. Word has length 109 [2018-11-07 16:44:16,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:44:16,412 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 121 transitions. [2018-11-07 16:44:16,413 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-11-07 16:44:16,413 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 121 transitions. [2018-11-07 16:44:16,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-11-07 16:44:16,414 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:44:16,414 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:44:16,414 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:44:16,414 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:44:16,414 INFO L82 PathProgramCache]: Analyzing trace with hash -1311036076, now seen corresponding path program 19 times [2018-11-07 16:44:16,415 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:44:16,415 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:16,415 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:44:16,415 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:16,416 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:44:16,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:44:17,253 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 199 proven. 190 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-11-07 16:44:17,253 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:17,253 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:44:17,253 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:44:17,253 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:44:17,253 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:17,253 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 16:44:17,262 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:44:17,262 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:44:17,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:44:17,299 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:44:18,231 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 19 proven. 370 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-11-07 16:44:18,232 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:44:20,106 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 19 proven. 370 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-11-07 16:44:20,125 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:44:20,125 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 79 [2018-11-07 16:44:20,125 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:44:20,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-11-07 16:44:20,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-11-07 16:44:20,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=785, Invalid=5377, Unknown=0, NotChecked=0, Total=6162 [2018-11-07 16:44:20,127 INFO L87 Difference]: Start difference. First operand 120 states and 121 transitions. Second operand 54 states. [2018-11-07 16:44:23,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:44:23,180 INFO L93 Difference]: Finished difference Result 223 states and 228 transitions. [2018-11-07 16:44:23,180 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-11-07 16:44:23,181 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 117 [2018-11-07 16:44:23,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:44:23,182 INFO L225 Difference]: With dead ends: 223 [2018-11-07 16:44:23,183 INFO L226 Difference]: Without dead ends: 132 [2018-11-07 16:44:23,184 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 182 SyntacticMatches, 6 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2513 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=1118, Invalid=7624, Unknown=0, NotChecked=0, Total=8742 [2018-11-07 16:44:23,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-11-07 16:44:23,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 122. [2018-11-07 16:44:23,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-11-07 16:44:23,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 123 transitions. [2018-11-07 16:44:23,193 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 123 transitions. Word has length 117 [2018-11-07 16:44:23,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:44:23,193 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 123 transitions. [2018-11-07 16:44:23,193 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-11-07 16:44:23,193 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 123 transitions. [2018-11-07 16:44:23,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-11-07 16:44:23,194 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:44:23,194 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 11, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:44:23,195 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:44:23,195 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:44:23,195 INFO L82 PathProgramCache]: Analyzing trace with hash 1322528718, now seen corresponding path program 20 times [2018-11-07 16:44:23,195 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:44:23,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:23,196 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:44:23,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:23,196 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:44:23,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:44:23,603 INFO L134 CoverageAnalysis]: Checked inductivity of 566 backedges. 151 proven. 262 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-11-07 16:44:23,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:23,604 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:44:23,604 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:44:23,604 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:44:23,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:23,604 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 16:44:23,614 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:44:23,615 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:44:23,659 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-11-07 16:44:23,659 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:44:23,663 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:44:24,358 INFO L134 CoverageAnalysis]: Checked inductivity of 566 backedges. 46 proven. 367 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-11-07 16:44:24,358 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:44:24,956 INFO L134 CoverageAnalysis]: Checked inductivity of 566 backedges. 46 proven. 367 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-11-07 16:44:24,975 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:44:24,976 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29, 29] total 56 [2018-11-07 16:44:24,976 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:44:24,976 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-11-07 16:44:24,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-11-07 16:44:24,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=479, Invalid=2601, Unknown=0, NotChecked=0, Total=3080 [2018-11-07 16:44:24,977 INFO L87 Difference]: Start difference. First operand 122 states and 123 transitions. Second operand 42 states. [2018-11-07 16:44:26,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:44:26,112 INFO L93 Difference]: Finished difference Result 137 states and 139 transitions. [2018-11-07 16:44:26,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-11-07 16:44:26,113 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 119 [2018-11-07 16:44:26,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:44:26,115 INFO L225 Difference]: With dead ends: 137 [2018-11-07 16:44:26,115 INFO L226 Difference]: Without dead ends: 135 [2018-11-07 16:44:26,117 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 199 SyntacticMatches, 14 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2051 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1126, Invalid=5194, Unknown=0, NotChecked=0, Total=6320 [2018-11-07 16:44:26,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-11-07 16:44:26,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 130. [2018-11-07 16:44:26,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-11-07 16:44:26,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2018-11-07 16:44:26,126 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 119 [2018-11-07 16:44:26,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:44:26,127 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2018-11-07 16:44:26,127 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-11-07 16:44:26,127 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2018-11-07 16:44:26,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-11-07 16:44:26,128 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:44:26,128 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:44:26,128 INFO L423 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:44:26,128 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:44:26,128 INFO L82 PathProgramCache]: Analyzing trace with hash -1290002927, now seen corresponding path program 21 times [2018-11-07 16:44:26,128 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:44:26,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:26,129 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:44:26,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:26,129 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:44:26,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:44:27,270 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 241 proven. 220 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-11-07 16:44:27,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:27,271 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:44:27,271 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:44:27,271 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:44:27,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:27,271 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 16:44:27,279 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:44:27,279 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:44:27,315 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:44:27,315 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:44:27,320 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:44:28,392 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 51 proven. 410 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-11-07 16:44:28,393 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:44:30,836 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 51 proven. 410 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-11-07 16:44:30,856 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:44:30,856 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 85 [2018-11-07 16:44:30,857 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:44:30,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-11-07 16:44:30,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-11-07 16:44:30,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=897, Invalid=6243, Unknown=0, NotChecked=0, Total=7140 [2018-11-07 16:44:30,858 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand 58 states. [2018-11-07 16:44:33,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:44:33,059 INFO L93 Difference]: Finished difference Result 241 states and 246 transitions. [2018-11-07 16:44:33,060 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-11-07 16:44:33,060 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 127 [2018-11-07 16:44:33,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:44:33,062 INFO L225 Difference]: With dead ends: 241 [2018-11-07 16:44:33,062 INFO L226 Difference]: Without dead ends: 142 [2018-11-07 16:44:33,063 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 198 SyntacticMatches, 6 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2904 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=1276, Invalid=8824, Unknown=0, NotChecked=0, Total=10100 [2018-11-07 16:44:33,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-11-07 16:44:33,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 132. [2018-11-07 16:44:33,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-11-07 16:44:33,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 133 transitions. [2018-11-07 16:44:33,072 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 133 transitions. Word has length 127 [2018-11-07 16:44:33,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:44:33,073 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 133 transitions. [2018-11-07 16:44:33,073 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-11-07 16:44:33,073 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 133 transitions. [2018-11-07 16:44:33,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-11-07 16:44:33,073 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:44:33,074 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 12, 12, 12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:44:33,074 INFO L423 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:44:33,074 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:44:33,074 INFO L82 PathProgramCache]: Analyzing trace with hash -348663797, now seen corresponding path program 22 times [2018-11-07 16:44:33,074 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:44:33,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:33,075 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:44:33,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:33,075 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:44:33,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:44:33,484 INFO L134 CoverageAnalysis]: Checked inductivity of 677 backedges. 177 proven. 310 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-11-07 16:44:33,484 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:33,484 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:44:33,484 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:44:33,484 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:44:33,485 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:33,485 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 16:44:33,493 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:44:33,493 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:44:33,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:44:33,536 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:44:34,025 INFO L134 CoverageAnalysis]: Checked inductivity of 677 backedges. 22 proven. 435 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 16:44:34,025 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:44:34,870 INFO L134 CoverageAnalysis]: Checked inductivity of 677 backedges. 22 proven. 435 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 16:44:34,891 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:44:34,891 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 58 [2018-11-07 16:44:34,891 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:44:34,892 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-11-07 16:44:34,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-11-07 16:44:34,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=532, Invalid=2774, Unknown=0, NotChecked=0, Total=3306 [2018-11-07 16:44:34,893 INFO L87 Difference]: Start difference. First operand 132 states and 133 transitions. Second operand 45 states. [2018-11-07 16:44:36,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:44:36,507 INFO L93 Difference]: Finished difference Result 147 states and 149 transitions. [2018-11-07 16:44:36,507 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-11-07 16:44:36,507 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 129 [2018-11-07 16:44:36,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:44:36,509 INFO L225 Difference]: With dead ends: 147 [2018-11-07 16:44:36,509 INFO L226 Difference]: Without dead ends: 145 [2018-11-07 16:44:36,509 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 220 SyntacticMatches, 13 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2218 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1262, Invalid=5710, Unknown=0, NotChecked=0, Total=6972 [2018-11-07 16:44:36,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-11-07 16:44:36,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 140. [2018-11-07 16:44:36,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2018-11-07 16:44:36,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 141 transitions. [2018-11-07 16:44:36,520 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 141 transitions. Word has length 129 [2018-11-07 16:44:36,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:44:36,520 INFO L480 AbstractCegarLoop]: Abstraction has 140 states and 141 transitions. [2018-11-07 16:44:36,520 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-11-07 16:44:36,521 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 141 transitions. [2018-11-07 16:44:36,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-11-07 16:44:36,521 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:44:36,522 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:44:36,522 INFO L423 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:44:36,522 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:44:36,522 INFO L82 PathProgramCache]: Analyzing trace with hash 1445867854, now seen corresponding path program 23 times [2018-11-07 16:44:36,522 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:44:36,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:36,523 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:44:36,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:36,523 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:44:36,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:44:37,563 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 287 proven. 252 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-11-07 16:44:37,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:37,564 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:44:37,564 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:44:37,564 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:44:37,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:37,564 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 16:44:37,573 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:44:37,573 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:44:37,628 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-11-07 16:44:37,629 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:44:37,632 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:44:38,424 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 56 proven. 483 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-11-07 16:44:38,424 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:44:40,159 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 56 proven. 483 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-11-07 16:44:40,180 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:44:40,180 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 35, 34] total 79 [2018-11-07 16:44:40,180 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:44:40,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-11-07 16:44:40,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-11-07 16:44:40,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=824, Invalid=5338, Unknown=0, NotChecked=0, Total=6162 [2018-11-07 16:44:40,182 INFO L87 Difference]: Start difference. First operand 140 states and 141 transitions. Second operand 50 states. [2018-11-07 16:44:41,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:44:41,261 INFO L93 Difference]: Finished difference Result 205 states and 220 transitions. [2018-11-07 16:44:41,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-11-07 16:44:41,262 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 137 [2018-11-07 16:44:41,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:44:41,263 INFO L225 Difference]: With dead ends: 205 [2018-11-07 16:44:41,264 INFO L226 Difference]: Without dead ends: 142 [2018-11-07 16:44:41,265 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 227 SyntacticMatches, 5 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2979 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=1136, Invalid=7794, Unknown=0, NotChecked=0, Total=8930 [2018-11-07 16:44:41,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-11-07 16:44:41,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2018-11-07 16:44:41,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-11-07 16:44:41,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2018-11-07 16:44:41,275 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 137 [2018-11-07 16:44:41,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:44:41,276 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2018-11-07 16:44:41,276 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-11-07 16:44:41,276 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2018-11-07 16:44:41,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2018-11-07 16:44:41,277 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:44:41,277 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 13, 13, 13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:44:41,277 INFO L423 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:44:41,277 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:44:41,278 INFO L82 PathProgramCache]: Analyzing trace with hash -277400888, now seen corresponding path program 24 times [2018-11-07 16:44:41,278 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:44:41,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:41,278 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:44:41,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:41,279 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:44:41,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:44:41,864 INFO L134 CoverageAnalysis]: Checked inductivity of 798 backedges. 205 proven. 362 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-11-07 16:44:41,865 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:41,865 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:44:41,865 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:44:41,865 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:44:41,865 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:41,865 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 16:44:41,873 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:44:41,873 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:44:41,916 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:44:41,916 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:44:41,920 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:44:42,459 INFO L134 CoverageAnalysis]: Checked inductivity of 798 backedges. 23 proven. 544 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-11-07 16:44:42,460 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:44:43,128 INFO L134 CoverageAnalysis]: Checked inductivity of 798 backedges. 23 proven. 544 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-11-07 16:44:43,148 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:44:43,148 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 33, 33] total 64 [2018-11-07 16:44:43,148 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:44:43,149 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-11-07 16:44:43,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-11-07 16:44:43,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=615, Invalid=3417, Unknown=0, NotChecked=0, Total=4032 [2018-11-07 16:44:43,150 INFO L87 Difference]: Start difference. First operand 142 states and 143 transitions. Second operand 48 states. [2018-11-07 16:44:45,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:44:45,180 INFO L93 Difference]: Finished difference Result 157 states and 159 transitions. [2018-11-07 16:44:45,180 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-11-07 16:44:45,181 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 139 [2018-11-07 16:44:45,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:44:45,183 INFO L225 Difference]: With dead ends: 157 [2018-11-07 16:44:45,183 INFO L226 Difference]: Without dead ends: 155 [2018-11-07 16:44:45,184 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 233 SyntacticMatches, 16 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2760 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1460, Invalid=6912, Unknown=0, NotChecked=0, Total=8372 [2018-11-07 16:44:45,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2018-11-07 16:44:45,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 150. [2018-11-07 16:44:45,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-11-07 16:44:45,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 151 transitions. [2018-11-07 16:44:45,195 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 151 transitions. Word has length 139 [2018-11-07 16:44:45,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:44:45,196 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 151 transitions. [2018-11-07 16:44:45,196 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-11-07 16:44:45,196 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 151 transitions. [2018-11-07 16:44:45,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-11-07 16:44:45,197 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:44:45,197 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:44:45,197 INFO L423 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:44:45,197 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:44:45,197 INFO L82 PathProgramCache]: Analyzing trace with hash 1416726283, now seen corresponding path program 25 times [2018-11-07 16:44:45,198 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:44:45,198 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:45,198 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:44:45,198 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:45,198 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:44:45,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:44:46,448 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 337 proven. 286 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-11-07 16:44:46,448 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:46,448 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:44:46,448 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:44:46,449 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:44:46,449 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:46,449 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 16:44:46,459 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:44:46,459 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:44:46,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:44:46,511 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:44:47,941 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 25 proven. 598 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-11-07 16:44:47,941 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:44:50,301 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 25 proven. 598 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-11-07 16:44:50,322 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:44:50,322 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 97 [2018-11-07 16:44:50,322 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:44:50,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-11-07 16:44:50,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-11-07 16:44:50,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=8134, Unknown=0, NotChecked=0, Total=9312 [2018-11-07 16:44:50,323 INFO L87 Difference]: Start difference. First operand 150 states and 151 transitions. Second operand 66 states. [2018-11-07 16:44:53,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:44:53,043 INFO L93 Difference]: Finished difference Result 277 states and 282 transitions. [2018-11-07 16:44:53,043 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-11-07 16:44:53,043 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 147 [2018-11-07 16:44:53,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:44:53,048 INFO L225 Difference]: With dead ends: 277 [2018-11-07 16:44:53,048 INFO L226 Difference]: Without dead ends: 162 [2018-11-07 16:44:53,049 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 230 SyntacticMatches, 6 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3824 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=1658, Invalid=11452, Unknown=0, NotChecked=0, Total=13110 [2018-11-07 16:44:53,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2018-11-07 16:44:53,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 152. [2018-11-07 16:44:53,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2018-11-07 16:44:53,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 153 transitions. [2018-11-07 16:44:53,063 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 153 transitions. Word has length 147 [2018-11-07 16:44:53,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:44:53,063 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 153 transitions. [2018-11-07 16:44:53,063 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-11-07 16:44:53,063 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 153 transitions. [2018-11-07 16:44:53,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-11-07 16:44:53,066 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:44:53,066 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 14, 14, 14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:44:53,066 INFO L423 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:44:53,067 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:44:53,067 INFO L82 PathProgramCache]: Analyzing trace with hash -2144700411, now seen corresponding path program 26 times [2018-11-07 16:44:53,067 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:44:53,067 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:53,068 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:44:53,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:53,068 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:44:53,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:44:54,653 INFO L134 CoverageAnalysis]: Checked inductivity of 929 backedges. 235 proven. 418 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-11-07 16:44:54,653 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:54,653 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:44:54,653 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:44:54,654 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:44:54,654 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:54,654 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 16:44:54,663 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:44:54,663 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:44:54,722 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-11-07 16:44:54,722 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:44:54,727 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:44:55,534 INFO L134 CoverageAnalysis]: Checked inductivity of 929 backedges. 61 proven. 592 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-11-07 16:44:55,534 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:44:56,525 INFO L134 CoverageAnalysis]: Checked inductivity of 929 backedges. 61 proven. 592 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-11-07 16:44:56,545 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:44:56,545 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 35, 35] total 68 [2018-11-07 16:44:56,545 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:44:56,545 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-11-07 16:44:56,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-11-07 16:44:56,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=707, Invalid=3849, Unknown=0, NotChecked=0, Total=4556 [2018-11-07 16:44:56,546 INFO L87 Difference]: Start difference. First operand 152 states and 153 transitions. Second operand 51 states. [2018-11-07 16:44:57,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:44:57,946 INFO L93 Difference]: Finished difference Result 167 states and 169 transitions. [2018-11-07 16:44:57,946 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-11-07 16:44:57,946 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 149 [2018-11-07 16:44:57,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:44:57,948 INFO L225 Difference]: With dead ends: 167 [2018-11-07 16:44:57,948 INFO L226 Difference]: Without dead ends: 165 [2018-11-07 16:44:57,949 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 250 SyntacticMatches, 17 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3152 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=1696, Invalid=7810, Unknown=0, NotChecked=0, Total=9506 [2018-11-07 16:44:57,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2018-11-07 16:44:57,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 160. [2018-11-07 16:44:57,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-11-07 16:44:57,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 161 transitions. [2018-11-07 16:44:57,961 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 161 transitions. Word has length 149 [2018-11-07 16:44:57,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:44:57,962 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 161 transitions. [2018-11-07 16:44:57,962 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-11-07 16:44:57,962 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 161 transitions. [2018-11-07 16:44:57,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2018-11-07 16:44:57,963 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:44:57,963 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:44:57,963 INFO L423 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:44:57,963 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:44:57,964 INFO L82 PathProgramCache]: Analyzing trace with hash 1214136136, now seen corresponding path program 27 times [2018-11-07 16:44:57,964 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:44:57,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:57,964 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:44:57,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:44:57,965 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:44:57,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:44:59,336 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 391 proven. 322 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-11-07 16:44:59,336 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:59,336 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:44:59,336 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:44:59,336 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:44:59,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:44:59,337 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 16:44:59,345 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:44:59,345 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:44:59,388 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:44:59,388 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:44:59,392 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:45:01,157 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 66 proven. 647 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-11-07 16:45:01,158 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:45:03,681 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 66 proven. 647 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-11-07 16:45:03,701 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:45:03,701 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 103 [2018-11-07 16:45:03,701 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:45:03,702 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-11-07 16:45:03,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-11-07 16:45:03,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1314, Invalid=9192, Unknown=0, NotChecked=0, Total=10506 [2018-11-07 16:45:03,703 INFO L87 Difference]: Start difference. First operand 160 states and 161 transitions. Second operand 70 states. [2018-11-07 16:45:08,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:45:08,310 INFO L93 Difference]: Finished difference Result 295 states and 300 transitions. [2018-11-07 16:45:08,311 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-11-07 16:45:08,311 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 157 [2018-11-07 16:45:08,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:45:08,314 INFO L225 Difference]: With dead ends: 295 [2018-11-07 16:45:08,315 INFO L226 Difference]: Without dead ends: 172 [2018-11-07 16:45:08,317 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 246 SyntacticMatches, 6 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4299 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=1849, Invalid=12913, Unknown=0, NotChecked=0, Total=14762 [2018-11-07 16:45:08,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-11-07 16:45:08,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 162. [2018-11-07 16:45:08,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-11-07 16:45:08,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 163 transitions. [2018-11-07 16:45:08,330 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 163 transitions. Word has length 157 [2018-11-07 16:45:08,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:45:08,331 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 163 transitions. [2018-11-07 16:45:08,331 INFO L481 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-11-07 16:45:08,331 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 163 transitions. [2018-11-07 16:45:08,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-11-07 16:45:08,332 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:45:08,332 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 15, 15, 15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:45:08,332 INFO L423 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:45:08,332 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:45:08,335 INFO L82 PathProgramCache]: Analyzing trace with hash -50217022, now seen corresponding path program 28 times [2018-11-07 16:45:08,335 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:45:08,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:45:08,336 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:45:08,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:45:08,336 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:45:08,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:45:09,234 INFO L134 CoverageAnalysis]: Checked inductivity of 1070 backedges. 267 proven. 478 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-11-07 16:45:09,235 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:45:09,235 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:45:09,235 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:45:09,235 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:45:09,235 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:45:09,235 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 16:45:09,252 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:45:09,253 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:45:09,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:45:09,309 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:45:10,465 INFO L134 CoverageAnalysis]: Checked inductivity of 1070 backedges. 28 proven. 678 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-11-07 16:45:10,465 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:45:11,234 INFO L134 CoverageAnalysis]: Checked inductivity of 1070 backedges. 28 proven. 678 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-11-07 16:45:11,254 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:45:11,254 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 70 [2018-11-07 16:45:11,254 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:45:11,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-11-07 16:45:11,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-11-07 16:45:11,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=772, Invalid=4058, Unknown=0, NotChecked=0, Total=4830 [2018-11-07 16:45:11,256 INFO L87 Difference]: Start difference. First operand 162 states and 163 transitions. Second operand 54 states. [2018-11-07 16:45:12,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:45:12,825 INFO L93 Difference]: Finished difference Result 177 states and 179 transitions. [2018-11-07 16:45:12,825 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-11-07 16:45:12,825 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 159 [2018-11-07 16:45:12,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:45:12,827 INFO L225 Difference]: With dead ends: 177 [2018-11-07 16:45:12,827 INFO L226 Difference]: Without dead ends: 175 [2018-11-07 16:45:12,829 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 387 GetRequests, 271 SyntacticMatches, 16 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3355 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1862, Invalid=8440, Unknown=0, NotChecked=0, Total=10302 [2018-11-07 16:45:12,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-11-07 16:45:12,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 170. [2018-11-07 16:45:12,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2018-11-07 16:45:12,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 171 transitions. [2018-11-07 16:45:12,840 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 171 transitions. Word has length 159 [2018-11-07 16:45:12,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:45:12,841 INFO L480 AbstractCegarLoop]: Abstraction has 170 states and 171 transitions. [2018-11-07 16:45:12,841 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-11-07 16:45:12,841 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 171 transitions. [2018-11-07 16:45:12,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-11-07 16:45:12,842 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:45:12,842 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:45:12,843 INFO L423 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:45:12,843 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:45:12,843 INFO L82 PathProgramCache]: Analyzing trace with hash 1870952965, now seen corresponding path program 29 times [2018-11-07 16:45:12,843 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:45:12,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:45:12,844 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:45:12,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:45:12,844 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:45:12,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:45:14,168 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 449 proven. 360 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-11-07 16:45:14,168 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:45:14,168 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:45:14,168 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:45:14,168 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:45:14,168 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:45:14,168 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 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 16:45:14,178 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:45:14,178 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:45:14,240 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2018-11-07 16:45:14,240 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:45:14,244 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:45:15,924 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 71 proven. 738 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-11-07 16:45:15,924 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:45:18,280 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 71 proven. 738 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-11-07 16:45:18,303 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:45:18,303 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 41, 40] total 110 [2018-11-07 16:45:18,303 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:45:18,304 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-11-07 16:45:18,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-11-07 16:45:18,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1514, Invalid=10476, Unknown=0, NotChecked=0, Total=11990 [2018-11-07 16:45:18,305 INFO L87 Difference]: Start difference. First operand 170 states and 171 transitions. Second operand 75 states. [2018-11-07 16:45:21,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:45:21,011 INFO L93 Difference]: Finished difference Result 247 states and 265 transitions. [2018-11-07 16:45:21,011 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-11-07 16:45:21,011 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 167 [2018-11-07 16:45:21,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:45:21,013 INFO L225 Difference]: With dead ends: 247 [2018-11-07 16:45:21,014 INFO L226 Difference]: Without dead ends: 172 [2018-11-07 16:45:21,016 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 262 SyntacticMatches, 5 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6855 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=2011, Invalid=15019, Unknown=0, NotChecked=0, Total=17030 [2018-11-07 16:45:21,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-11-07 16:45:21,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 172. [2018-11-07 16:45:21,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-11-07 16:45:21,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 173 transitions. [2018-11-07 16:45:21,030 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 173 transitions. Word has length 167 [2018-11-07 16:45:21,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:45:21,030 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 173 transitions. [2018-11-07 16:45:21,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-11-07 16:45:21,030 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 173 transitions. [2018-11-07 16:45:21,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2018-11-07 16:45:21,032 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:45:21,032 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 16, 16, 16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:45:21,032 INFO L423 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:45:21,032 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:45:21,032 INFO L82 PathProgramCache]: Analyzing trace with hash 1120217599, now seen corresponding path program 30 times [2018-11-07 16:45:21,032 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:45:21,033 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:45:21,033 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:45:21,033 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:45:21,033 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:45:21,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:45:22,143 INFO L134 CoverageAnalysis]: Checked inductivity of 1221 backedges. 301 proven. 542 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-11-07 16:45:22,144 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:45:22,144 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:45:22,144 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:45:22,144 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:45:22,144 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:45:22,144 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 16:45:22,153 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:45:22,153 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:45:22,206 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:45:22,206 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:45:22,217 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:45:23,607 INFO L134 CoverageAnalysis]: Checked inductivity of 1221 backedges. 29 proven. 814 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-11-07 16:45:23,608 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:45:24,502 INFO L134 CoverageAnalysis]: Checked inductivity of 1221 backedges. 29 proven. 814 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-11-07 16:45:24,522 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:45:24,523 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 39, 39] total 76 [2018-11-07 16:45:24,523 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:45:24,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-11-07 16:45:24,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-11-07 16:45:24,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=870, Invalid=4830, Unknown=0, NotChecked=0, Total=5700 [2018-11-07 16:45:24,525 INFO L87 Difference]: Start difference. First operand 172 states and 173 transitions. Second operand 57 states. [2018-11-07 16:45:26,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:45:26,577 INFO L93 Difference]: Finished difference Result 187 states and 189 transitions. [2018-11-07 16:45:26,578 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-11-07 16:45:26,578 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 169 [2018-11-07 16:45:26,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:45:26,580 INFO L225 Difference]: With dead ends: 187 [2018-11-07 16:45:26,580 INFO L226 Difference]: Without dead ends: 185 [2018-11-07 16:45:26,581 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 284 SyntacticMatches, 19 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4017 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=2099, Invalid=9891, Unknown=0, NotChecked=0, Total=11990 [2018-11-07 16:45:26,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2018-11-07 16:45:26,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 180. [2018-11-07 16:45:26,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-11-07 16:45:26,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 181 transitions. [2018-11-07 16:45:26,591 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 181 transitions. Word has length 169 [2018-11-07 16:45:26,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:45:26,592 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 181 transitions. [2018-11-07 16:45:26,592 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-11-07 16:45:26,592 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 181 transitions. [2018-11-07 16:45:26,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-11-07 16:45:26,593 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:45:26,593 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:45:26,594 INFO L423 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:45:26,594 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:45:26,594 INFO L82 PathProgramCache]: Analyzing trace with hash -326346942, now seen corresponding path program 31 times [2018-11-07 16:45:26,594 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:45:26,595 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:45:26,595 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:45:26,595 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:45:26,595 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:45:26,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:45:28,164 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 511 proven. 400 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-11-07 16:45:28,164 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:45:28,164 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:45:28,164 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:45:28,164 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:45:28,165 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:45:28,165 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 16:45:28,173 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:45:28,173 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:45:28,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:45:28,228 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:45:30,189 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 31 proven. 880 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-11-07 16:45:30,190 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:45:33,662 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 31 proven. 880 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-11-07 16:45:33,682 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:45:33,682 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 115 [2018-11-07 16:45:33,682 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:45:33,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 78 states [2018-11-07 16:45:33,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2018-11-07 16:45:33,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1652, Invalid=11458, Unknown=0, NotChecked=0, Total=13110 [2018-11-07 16:45:33,684 INFO L87 Difference]: Start difference. First operand 180 states and 181 transitions. Second operand 78 states. [2018-11-07 16:45:37,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:45:37,052 INFO L93 Difference]: Finished difference Result 331 states and 336 transitions. [2018-11-07 16:45:37,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-11-07 16:45:37,052 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 177 [2018-11-07 16:45:37,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:45:37,054 INFO L225 Difference]: With dead ends: 331 [2018-11-07 16:45:37,054 INFO L226 Difference]: Without dead ends: 192 [2018-11-07 16:45:37,056 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 278 SyntacticMatches, 6 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5405 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=2306, Invalid=16054, Unknown=0, NotChecked=0, Total=18360 [2018-11-07 16:45:37,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2018-11-07 16:45:37,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 182. [2018-11-07 16:45:37,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2018-11-07 16:45:37,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 183 transitions. [2018-11-07 16:45:37,068 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 183 transitions. Word has length 177 [2018-11-07 16:45:37,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:45:37,069 INFO L480 AbstractCegarLoop]: Abstraction has 182 states and 183 transitions. [2018-11-07 16:45:37,069 INFO L481 AbstractCegarLoop]: Interpolant automaton has 78 states. [2018-11-07 16:45:37,069 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 183 transitions. [2018-11-07 16:45:37,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-11-07 16:45:37,070 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:45:37,070 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 17, 17, 17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:45:37,070 INFO L423 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:45:37,071 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:45:37,071 INFO L82 PathProgramCache]: Analyzing trace with hash 1834276540, now seen corresponding path program 32 times [2018-11-07 16:45:37,071 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:45:37,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:45:37,072 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:45:37,072 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:45:37,072 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:45:37,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:45:37,674 INFO L134 CoverageAnalysis]: Checked inductivity of 1382 backedges. 337 proven. 610 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-11-07 16:45:37,674 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:45:37,674 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:45:37,675 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:45:37,675 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:45:37,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:45:37,675 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 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 16:45:37,682 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:45:37,682 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:45:37,761 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-11-07 16:45:37,761 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:45:37,765 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:45:38,519 INFO L134 CoverageAnalysis]: Checked inductivity of 1382 backedges. 76 proven. 871 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-11-07 16:45:38,520 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:45:39,576 INFO L134 CoverageAnalysis]: Checked inductivity of 1382 backedges. 76 proven. 871 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-11-07 16:45:39,597 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:45:39,598 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 41, 41] total 80 [2018-11-07 16:45:39,598 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:45:39,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-11-07 16:45:39,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-11-07 16:45:39,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=980, Invalid=5340, Unknown=0, NotChecked=0, Total=6320 [2018-11-07 16:45:39,599 INFO L87 Difference]: Start difference. First operand 182 states and 183 transitions. Second operand 60 states. [2018-11-07 16:45:41,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:45:41,556 INFO L93 Difference]: Finished difference Result 197 states and 199 transitions. [2018-11-07 16:45:41,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-11-07 16:45:41,556 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 179 [2018-11-07 16:45:41,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:45:41,558 INFO L225 Difference]: With dead ends: 197 [2018-11-07 16:45:41,558 INFO L226 Difference]: Without dead ends: 195 [2018-11-07 16:45:41,560 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 301 SyntacticMatches, 20 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4487 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2383, Invalid=10957, Unknown=0, NotChecked=0, Total=13340 [2018-11-07 16:45:41,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2018-11-07 16:45:41,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 190. [2018-11-07 16:45:41,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2018-11-07 16:45:41,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 191 transitions. [2018-11-07 16:45:41,574 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 191 transitions. Word has length 179 [2018-11-07 16:45:41,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:45:41,574 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 191 transitions. [2018-11-07 16:45:41,574 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-11-07 16:45:41,574 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 191 transitions. [2018-11-07 16:45:41,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2018-11-07 16:45:41,575 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:45:41,576 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:45:41,576 INFO L423 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:45:41,576 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:45:41,576 INFO L82 PathProgramCache]: Analyzing trace with hash -1992952065, now seen corresponding path program 33 times [2018-11-07 16:45:41,576 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:45:41,577 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:45:41,577 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:45:41,577 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:45:41,577 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:45:41,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:45:43,867 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 577 proven. 442 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-11-07 16:45:43,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:45:43,868 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:45:43,868 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:45:43,868 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:45:43,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:45:43,868 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 16:45:43,876 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:45:43,876 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:45:43,928 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:45:43,929 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:45:43,934 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:45:46,021 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 81 proven. 938 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-11-07 16:45:46,021 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:45:49,658 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 81 proven. 938 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-11-07 16:45:49,678 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:45:49,678 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 121 [2018-11-07 16:45:49,678 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:45:49,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 82 states [2018-11-07 16:45:49,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2018-11-07 16:45:49,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1812, Invalid=12708, Unknown=0, NotChecked=0, Total=14520 [2018-11-07 16:45:49,680 INFO L87 Difference]: Start difference. First operand 190 states and 191 transitions. Second operand 82 states. [2018-11-07 16:45:53,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:45:53,724 INFO L93 Difference]: Finished difference Result 349 states and 354 transitions. [2018-11-07 16:45:53,725 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-11-07 16:45:53,725 INFO L78 Accepts]: Start accepts. Automaton has 82 states. Word has length 187 [2018-11-07 16:45:53,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:45:53,727 INFO L225 Difference]: With dead ends: 349 [2018-11-07 16:45:53,727 INFO L226 Difference]: Without dead ends: 202 [2018-11-07 16:45:53,729 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 441 GetRequests, 294 SyntacticMatches, 6 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5964 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=2530, Invalid=17776, Unknown=0, NotChecked=0, Total=20306 [2018-11-07 16:45:53,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2018-11-07 16:45:53,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 192. [2018-11-07 16:45:53,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-11-07 16:45:53,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 193 transitions. [2018-11-07 16:45:53,743 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 193 transitions. Word has length 187 [2018-11-07 16:45:53,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:45:53,743 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 193 transitions. [2018-11-07 16:45:53,743 INFO L481 AbstractCegarLoop]: Interpolant automaton has 82 states. [2018-11-07 16:45:53,743 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 193 transitions. [2018-11-07 16:45:53,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-11-07 16:45:53,744 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:45:53,745 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 18, 18, 18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:45:53,745 INFO L423 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:45:53,745 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:45:53,745 INFO L82 PathProgramCache]: Analyzing trace with hash 430499321, now seen corresponding path program 34 times [2018-11-07 16:45:53,745 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:45:53,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:45:53,746 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:45:53,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:45:53,746 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:45:53,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:45:54,504 INFO L134 CoverageAnalysis]: Checked inductivity of 1553 backedges. 375 proven. 682 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-11-07 16:45:54,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:45:54,504 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:45:54,505 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:45:54,505 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:45:54,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:45:54,505 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 16:45:54,513 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:45:54,513 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:45:54,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:45:54,567 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:45:55,483 INFO L134 CoverageAnalysis]: Checked inductivity of 1553 backedges. 34 proven. 975 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-11-07 16:45:55,484 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:45:56,750 INFO L134 CoverageAnalysis]: Checked inductivity of 1553 backedges. 34 proven. 975 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-11-07 16:45:56,771 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:45:56,771 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 82 [2018-11-07 16:45:56,771 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:45:56,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-11-07 16:45:56,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-11-07 16:45:56,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1057, Invalid=5585, Unknown=0, NotChecked=0, Total=6642 [2018-11-07 16:45:56,773 INFO L87 Difference]: Start difference. First operand 192 states and 193 transitions. Second operand 63 states. [2018-11-07 16:45:58,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:45:58,948 INFO L93 Difference]: Finished difference Result 207 states and 209 transitions. [2018-11-07 16:45:58,948 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-11-07 16:45:58,948 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 189 [2018-11-07 16:45:58,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:45:58,950 INFO L225 Difference]: With dead ends: 207 [2018-11-07 16:45:58,950 INFO L226 Difference]: Without dead ends: 205 [2018-11-07 16:45:58,951 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 459 GetRequests, 322 SyntacticMatches, 19 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4726 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=2579, Invalid=11701, Unknown=0, NotChecked=0, Total=14280 [2018-11-07 16:45:58,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-11-07 16:45:58,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 200. [2018-11-07 16:45:58,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2018-11-07 16:45:58,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 201 transitions. [2018-11-07 16:45:58,964 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 201 transitions. Word has length 189 [2018-11-07 16:45:58,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:45:58,964 INFO L480 AbstractCegarLoop]: Abstraction has 200 states and 201 transitions. [2018-11-07 16:45:58,964 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-11-07 16:45:58,965 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 201 transitions. [2018-11-07 16:45:58,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-11-07 16:45:58,966 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:45:58,966 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:45:58,966 INFO L423 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:45:58,966 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:45:58,967 INFO L82 PathProgramCache]: Analyzing trace with hash -128353988, now seen corresponding path program 35 times [2018-11-07 16:45:58,967 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:45:58,967 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:45:58,967 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:45:58,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:45:58,968 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:45:58,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:46:01,143 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 647 proven. 486 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-11-07 16:46:01,143 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:46:01,144 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:46:01,144 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:46:01,144 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:46:01,144 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:46:01,144 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 16:46:01,152 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:46:01,153 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:46:01,231 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2018-11-07 16:46:01,231 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:46:01,235 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:46:03,359 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 86 proven. 1047 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-11-07 16:46:03,359 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:46:06,447 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 86 proven. 1047 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-11-07 16:46:06,467 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:46:06,467 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 47, 46] total 128 [2018-11-07 16:46:06,467 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:46:06,468 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-11-07 16:46:06,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-11-07 16:46:06,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2072, Invalid=14184, Unknown=0, NotChecked=0, Total=16256 [2018-11-07 16:46:06,469 INFO L87 Difference]: Start difference. First operand 200 states and 201 transitions. Second operand 87 states. [2018-11-07 16:46:09,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:46:09,694 INFO L93 Difference]: Finished difference Result 289 states and 310 transitions. [2018-11-07 16:46:09,694 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-11-07 16:46:09,694 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 197 [2018-11-07 16:46:09,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:46:09,696 INFO L225 Difference]: With dead ends: 289 [2018-11-07 16:46:09,696 INFO L226 Difference]: Without dead ends: 202 [2018-11-07 16:46:09,698 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 310 SyntacticMatches, 5 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9456 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=2713, Invalid=20239, Unknown=0, NotChecked=0, Total=22952 [2018-11-07 16:46:09,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2018-11-07 16:46:09,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 202. [2018-11-07 16:46:09,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2018-11-07 16:46:09,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 203 transitions. [2018-11-07 16:46:09,713 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 203 transitions. Word has length 197 [2018-11-07 16:46:09,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:46:09,714 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 203 transitions. [2018-11-07 16:46:09,714 INFO L481 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-11-07 16:46:09,714 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 203 transitions. [2018-11-07 16:46:09,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2018-11-07 16:46:09,715 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:46:09,715 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 19, 19, 19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:46:09,715 INFO L423 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:46:09,715 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:46:09,716 INFO L82 PathProgramCache]: Analyzing trace with hash 668039094, now seen corresponding path program 36 times [2018-11-07 16:46:09,716 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:46:09,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:46:09,716 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:46:09,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:46:09,717 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:46:09,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:46:11,109 INFO L134 CoverageAnalysis]: Checked inductivity of 1734 backedges. 415 proven. 758 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-11-07 16:46:11,109 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:46:11,109 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:46:11,109 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:46:11,109 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:46:11,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:46:11,110 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 16:46:11,119 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:46:11,119 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:46:11,175 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:46:11,175 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:46:11,179 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:46:12,817 INFO L134 CoverageAnalysis]: Checked inductivity of 1734 backedges. 35 proven. 1138 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-11-07 16:46:12,817 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:46:14,025 INFO L134 CoverageAnalysis]: Checked inductivity of 1734 backedges. 35 proven. 1138 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-11-07 16:46:14,046 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:46:14,046 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 45, 45] total 88 [2018-11-07 16:46:14,046 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:46:14,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-11-07 16:46:14,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-11-07 16:46:14,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1170, Invalid=6486, Unknown=0, NotChecked=0, Total=7656 [2018-11-07 16:46:14,047 INFO L87 Difference]: Start difference. First operand 202 states and 203 transitions. Second operand 66 states. [2018-11-07 16:46:16,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:46:16,339 INFO L93 Difference]: Finished difference Result 217 states and 219 transitions. [2018-11-07 16:46:16,340 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-11-07 16:46:16,340 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 199 [2018-11-07 16:46:16,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:46:16,342 INFO L225 Difference]: With dead ends: 217 [2018-11-07 16:46:16,342 INFO L226 Difference]: Without dead ends: 215 [2018-11-07 16:46:16,344 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 335 SyntacticMatches, 22 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5508 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=2855, Invalid=13401, Unknown=0, NotChecked=0, Total=16256 [2018-11-07 16:46:16,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2018-11-07 16:46:16,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 210. [2018-11-07 16:46:16,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-11-07 16:46:16,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 211 transitions. [2018-11-07 16:46:16,356 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 211 transitions. Word has length 199 [2018-11-07 16:46:16,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:46:16,356 INFO L480 AbstractCegarLoop]: Abstraction has 210 states and 211 transitions. [2018-11-07 16:46:16,356 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-11-07 16:46:16,356 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 211 transitions. [2018-11-07 16:46:16,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2018-11-07 16:46:16,358 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:46:16,358 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:46:16,358 INFO L423 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:46:16,358 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:46:16,359 INFO L82 PathProgramCache]: Analyzing trace with hash -1746469383, now seen corresponding path program 37 times [2018-11-07 16:46:16,359 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:46:16,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:46:16,359 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:46:16,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:46:16,360 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:46:16,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:46:18,792 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 721 proven. 532 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-11-07 16:46:18,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:46:18,793 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:46:18,793 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:46:18,793 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:46:18,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:46:18,793 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 16:46:18,803 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:46:18,804 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:46:18,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:46:18,868 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:46:21,348 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 37 proven. 1216 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-11-07 16:46:21,349 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:46:25,695 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 37 proven. 1216 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-11-07 16:46:25,717 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:46:25,717 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 133 [2018-11-07 16:46:25,717 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:46:25,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 90 states [2018-11-07 16:46:25,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2018-11-07 16:46:25,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2207, Invalid=15349, Unknown=0, NotChecked=0, Total=17556 [2018-11-07 16:46:25,719 INFO L87 Difference]: Start difference. First operand 210 states and 211 transitions. Second operand 90 states. [2018-11-07 16:46:30,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:46:30,703 INFO L93 Difference]: Finished difference Result 385 states and 390 transitions. [2018-11-07 16:46:30,703 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-11-07 16:46:30,703 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 207 [2018-11-07 16:46:30,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:46:30,705 INFO L225 Difference]: With dead ends: 385 [2018-11-07 16:46:30,705 INFO L226 Difference]: Without dead ends: 222 [2018-11-07 16:46:30,707 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 326 SyntacticMatches, 6 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7256 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=3062, Invalid=21430, Unknown=0, NotChecked=0, Total=24492 [2018-11-07 16:46:30,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-11-07 16:46:30,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 212. [2018-11-07 16:46:30,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 212 states. [2018-11-07 16:46:30,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 213 transitions. [2018-11-07 16:46:30,720 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 213 transitions. Word has length 207 [2018-11-07 16:46:30,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:46:30,721 INFO L480 AbstractCegarLoop]: Abstraction has 212 states and 213 transitions. [2018-11-07 16:46:30,721 INFO L481 AbstractCegarLoop]: Interpolant automaton has 90 states. [2018-11-07 16:46:30,721 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 213 transitions. [2018-11-07 16:46:30,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-11-07 16:46:30,722 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:46:30,722 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 20, 20, 20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:46:30,723 INFO L423 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:46:30,723 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:46:30,723 INFO L82 PathProgramCache]: Analyzing trace with hash -50942989, now seen corresponding path program 38 times [2018-11-07 16:46:30,723 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:46:30,724 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:46:30,724 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:46:30,724 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:46:30,724 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:46:30,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:46:31,749 INFO L134 CoverageAnalysis]: Checked inductivity of 1925 backedges. 457 proven. 838 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-11-07 16:46:31,749 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:46:31,749 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:46:31,749 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:46:31,750 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:46:31,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:46:31,750 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 16:46:31,760 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:46:31,760 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:46:32,050 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-11-07 16:46:32,050 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:46:32,055 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:46:33,293 INFO L134 CoverageAnalysis]: Checked inductivity of 1925 backedges. 91 proven. 1204 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-11-07 16:46:33,293 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:46:34,701 INFO L134 CoverageAnalysis]: Checked inductivity of 1925 backedges. 91 proven. 1204 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-11-07 16:46:34,721 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:46:34,722 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 47, 47] total 92 [2018-11-07 16:46:34,722 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:46:34,722 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-11-07 16:46:34,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-11-07 16:46:34,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1298, Invalid=7074, Unknown=0, NotChecked=0, Total=8372 [2018-11-07 16:46:34,724 INFO L87 Difference]: Start difference. First operand 212 states and 213 transitions. Second operand 69 states. [2018-11-07 16:46:37,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:46:37,152 INFO L93 Difference]: Finished difference Result 227 states and 229 transitions. [2018-11-07 16:46:37,152 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-11-07 16:46:37,152 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 209 [2018-11-07 16:46:37,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:46:37,155 INFO L225 Difference]: With dead ends: 227 [2018-11-07 16:46:37,155 INFO L226 Difference]: Without dead ends: 225 [2018-11-07 16:46:37,156 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 352 SyntacticMatches, 23 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6056 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=3187, Invalid=14635, Unknown=0, NotChecked=0, Total=17822 [2018-11-07 16:46:37,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2018-11-07 16:46:37,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 220. [2018-11-07 16:46:37,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2018-11-07 16:46:37,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 221 transitions. [2018-11-07 16:46:37,172 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 221 transitions. Word has length 209 [2018-11-07 16:46:37,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:46:37,172 INFO L480 AbstractCegarLoop]: Abstraction has 220 states and 221 transitions. [2018-11-07 16:46:37,173 INFO L481 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-11-07 16:46:37,173 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 221 transitions. [2018-11-07 16:46:37,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2018-11-07 16:46:37,174 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:46:37,174 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:46:37,174 INFO L423 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:46:37,175 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:46:37,175 INFO L82 PathProgramCache]: Analyzing trace with hash -1293507274, now seen corresponding path program 39 times [2018-11-07 16:46:37,175 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:46:37,175 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:46:37,176 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:46:37,176 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:46:37,176 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:46:37,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:46:40,213 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 799 proven. 580 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2018-11-07 16:46:40,213 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:46:40,214 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:46:40,214 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:46:40,214 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:46:40,214 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:46:40,214 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 16:46:40,222 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:46:40,223 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:46:40,282 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:46:40,282 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:46:40,288 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:46:43,705 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 96 proven. 1283 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2018-11-07 16:46:43,705 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:46:48,471 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 96 proven. 1283 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2018-11-07 16:46:48,491 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:46:48,491 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 139 [2018-11-07 16:46:48,491 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:46:48,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 94 states [2018-11-07 16:46:48,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2018-11-07 16:46:48,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2391, Invalid=16791, Unknown=0, NotChecked=0, Total=19182 [2018-11-07 16:46:48,493 INFO L87 Difference]: Start difference. First operand 220 states and 221 transitions. Second operand 94 states. [2018-11-07 16:46:53,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:46:53,586 INFO L93 Difference]: Finished difference Result 403 states and 408 transitions. [2018-11-07 16:46:53,587 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-11-07 16:46:53,587 INFO L78 Accepts]: Start accepts. Automaton has 94 states. Word has length 217 [2018-11-07 16:46:53,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:46:53,589 INFO L225 Difference]: With dead ends: 403 [2018-11-07 16:46:53,589 INFO L226 Difference]: Without dead ends: 232 [2018-11-07 16:46:53,591 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 510 GetRequests, 342 SyntacticMatches, 6 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7899 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=3319, Invalid=23413, Unknown=0, NotChecked=0, Total=26732 [2018-11-07 16:46:53,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2018-11-07 16:46:53,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 222. [2018-11-07 16:46:53,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2018-11-07 16:46:53,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 223 transitions. [2018-11-07 16:46:53,607 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 223 transitions. Word has length 217 [2018-11-07 16:46:53,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:46:53,607 INFO L480 AbstractCegarLoop]: Abstraction has 222 states and 223 transitions. [2018-11-07 16:46:53,607 INFO L481 AbstractCegarLoop]: Interpolant automaton has 94 states. [2018-11-07 16:46:53,607 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 223 transitions. [2018-11-07 16:46:53,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2018-11-07 16:46:53,608 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:46:53,608 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 21, 21, 21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:46:53,608 INFO L423 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:46:53,608 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:46:53,608 INFO L82 PathProgramCache]: Analyzing trace with hash 1163436720, now seen corresponding path program 40 times [2018-11-07 16:46:53,608 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:46:53,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:46:53,609 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:46:53,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:46:53,609 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:46:53,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:46:54,492 INFO L134 CoverageAnalysis]: Checked inductivity of 2126 backedges. 501 proven. 922 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2018-11-07 16:46:54,492 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:46:54,492 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:46:54,493 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:46:54,493 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:46:54,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:46:54,493 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 16:46:54,501 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:46:54,501 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:46:54,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:46:54,570 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:46:55,740 INFO L134 CoverageAnalysis]: Checked inductivity of 2126 backedges. 40 proven. 1326 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-11-07 16:46:55,740 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:46:57,043 INFO L134 CoverageAnalysis]: Checked inductivity of 2126 backedges. 40 proven. 1326 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-11-07 16:46:57,063 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:46:57,064 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47, 47] total 94 [2018-11-07 16:46:57,064 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:46:57,064 INFO L459 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-11-07 16:46:57,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-11-07 16:46:57,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1387, Invalid=7355, Unknown=0, NotChecked=0, Total=8742 [2018-11-07 16:46:57,065 INFO L87 Difference]: Start difference. First operand 222 states and 223 transitions. Second operand 72 states. [2018-11-07 16:47:00,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:47:00,099 INFO L93 Difference]: Finished difference Result 237 states and 239 transitions. [2018-11-07 16:47:00,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-11-07 16:47:00,100 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 219 [2018-11-07 16:47:00,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:47:00,102 INFO L225 Difference]: With dead ends: 237 [2018-11-07 16:47:00,102 INFO L226 Difference]: Without dead ends: 235 [2018-11-07 16:47:00,104 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 531 GetRequests, 373 SyntacticMatches, 22 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6331 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=3413, Invalid=15493, Unknown=0, NotChecked=0, Total=18906 [2018-11-07 16:47:00,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2018-11-07 16:47:00,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 230. [2018-11-07 16:47:00,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 230 states. [2018-11-07 16:47:00,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 231 transitions. [2018-11-07 16:47:00,121 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 231 transitions. Word has length 219 [2018-11-07 16:47:00,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:47:00,122 INFO L480 AbstractCegarLoop]: Abstraction has 230 states and 231 transitions. [2018-11-07 16:47:00,122 INFO L481 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-11-07 16:47:00,122 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 231 transitions. [2018-11-07 16:47:00,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2018-11-07 16:47:00,123 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:47:00,123 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:47:00,124 INFO L423 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:47:00,124 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:47:00,124 INFO L82 PathProgramCache]: Analyzing trace with hash 1131974387, now seen corresponding path program 41 times [2018-11-07 16:47:00,124 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:47:00,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:00,125 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:47:00,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:00,125 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:47:00,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:02,275 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 881 proven. 630 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2018-11-07 16:47:02,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:02,275 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:47:02,275 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:47:02,276 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:47:02,276 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:02,276 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 16:47:02,285 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:47:02,285 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:47:02,371 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-11-07 16:47:02,372 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:47:02,376 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:47:04,154 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 101 proven. 1410 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2018-11-07 16:47:04,154 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:47:07,793 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 101 proven. 1410 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2018-11-07 16:47:07,813 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:47:07,814 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 53, 52] total 124 [2018-11-07 16:47:07,814 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:47:07,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-11-07 16:47:07,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-11-07 16:47:07,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2057, Invalid=13195, Unknown=0, NotChecked=0, Total=15252 [2018-11-07 16:47:07,815 INFO L87 Difference]: Start difference. First operand 230 states and 231 transitions. Second operand 77 states. [2018-11-07 16:47:11,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:47:11,618 INFO L93 Difference]: Finished difference Result 331 states and 355 transitions. [2018-11-07 16:47:11,618 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-11-07 16:47:11,619 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 227 [2018-11-07 16:47:11,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:47:11,621 INFO L225 Difference]: With dead ends: 331 [2018-11-07 16:47:11,621 INFO L226 Difference]: Without dead ends: 232 [2018-11-07 16:47:11,623 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 532 GetRequests, 380 SyntacticMatches, 5 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7605 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=2765, Invalid=19287, Unknown=0, NotChecked=0, Total=22052 [2018-11-07 16:47:11,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2018-11-07 16:47:11,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 232. [2018-11-07 16:47:11,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2018-11-07 16:47:11,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 233 transitions. [2018-11-07 16:47:11,640 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 233 transitions. Word has length 227 [2018-11-07 16:47:11,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:47:11,640 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 233 transitions. [2018-11-07 16:47:11,640 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-11-07 16:47:11,641 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 233 transitions. [2018-11-07 16:47:11,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2018-11-07 16:47:11,641 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:47:11,642 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 22, 22, 22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:47:11,642 INFO L423 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:47:11,642 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:47:11,642 INFO L82 PathProgramCache]: Analyzing trace with hash 911178733, now seen corresponding path program 42 times [2018-11-07 16:47:11,642 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:47:11,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:11,643 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:47:11,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:11,643 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:47:11,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:12,549 INFO L134 CoverageAnalysis]: Checked inductivity of 2337 backedges. 547 proven. 1010 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2018-11-07 16:47:12,550 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:12,550 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:47:12,550 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:47:12,550 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:47:12,550 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:12,550 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 16:47:12,559 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:47:12,559 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:47:12,622 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:47:12,622 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:47:12,627 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:47:14,048 INFO L134 CoverageAnalysis]: Checked inductivity of 2337 backedges. 41 proven. 1516 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2018-11-07 16:47:14,048 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-11-07 16:47:15,587 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-11-07 16:47:15,788 WARN L521 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:47:15,788 WARN L549 AbstractCegarLoop]: Verification canceled [2018-11-07 16:47:15,795 WARN L205 ceAbstractionStarter]: Timeout [2018-11-07 16:47:15,795 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 04:47:15 BoogieIcfgContainer [2018-11-07 16:47:15,795 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-07 16:47:15,796 INFO L168 Benchmark]: Toolchain (without parser) took 234213.59 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 758.1 MB). Free memory was 1.4 GB in the beginning and 2.0 GB in the end (delta: -596.8 MB). Peak memory consumption was 161.3 MB. Max. memory is 7.1 GB. [2018-11-07 16:47:15,798 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 16:47:15,798 INFO L168 Benchmark]: CACSL2BoogieTranslator took 271.94 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-11-07 16:47:15,799 INFO L168 Benchmark]: Boogie Procedure Inliner took 23.07 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 16:47:15,799 INFO L168 Benchmark]: Boogie Preprocessor took 29.97 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 16:47:15,799 INFO L168 Benchmark]: RCFGBuilder took 472.48 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 756.0 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -809.4 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. [2018-11-07 16:47:15,800 INFO L168 Benchmark]: TraceAbstraction took 233411.40 ms. Allocated memory was 2.3 GB in the beginning and 2.3 GB in the end (delta: 2.1 MB). Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 202.0 MB). Peak memory consumption was 204.1 MB. Max. memory is 7.1 GB. [2018-11-07 16:47:15,804 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 271.94 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 23.07 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 29.97 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 472.48 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 756.0 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -809.4 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 233411.40 ms. Allocated memory was 2.3 GB in the beginning and 2.3 GB in the end (delta: 2.1 MB). Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 202.0 MB). Peak memory consumption was 204.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 230 with TraceHistMax 24,while TraceCheckSpWp was constructing backward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 99 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. TIMEOUT Result, 233.3s OverallTime, 46 OverallIterations, 24 TraceHistogramMax, 79.8s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 1473 SDtfs, 5912 SDslu, 41778 SDs, 0 SdLazy, 62097 SolverSat, 5577 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 44.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 12531 GetRequests, 8431 SyntacticMatches, 400 SemanticMatches, 3700 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129271 ImplicationChecksByTransitivity, 158.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=232occurred in iteration=45, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.7s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.4s AutomataMinimizationTime, 45 MinimizatonAttempts, 235 StatesRemovedByMinimization, 34 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.3s SsaConstructionTime, 2.3s SatisfiabilityAnalysisTime, 142.0s InterpolantComputationTime, 10395 NumberOfCodeBlocks, 10395 NumberOfCodeBlocksAsserted, 278 NumberOfCheckSat, 15447 ConstructedInterpolants, 0 QuantifiedInterpolants, 18921043 SizeOfPredicates, 228 NumberOfNonLiveVariables, 11107 ConjunctsInSsa, 2169 ConjunctsInUnsatCore, 131 InterpolantComputations, 2 PerfectInterpolantSequences, 44759/99777 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown