java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength4_true-valid-memsafety_true-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-20 23:51:16,882 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-20 23:51:16,884 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-20 23:51:16,900 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-20 23:51:16,900 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-20 23:51:16,901 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-20 23:51:16,902 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-20 23:51:16,903 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-20 23:51:16,905 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-20 23:51:16,906 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-20 23:51:16,906 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-20 23:51:16,906 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-20 23:51:16,907 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-20 23:51:16,908 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-20 23:51:16,909 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-20 23:51:16,911 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-20 23:51:16,914 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-20 23:51:16,916 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-20 23:51:16,917 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-20 23:51:16,919 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-20 23:51:16,921 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-20 23:51:16,927 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-20 23:51:16,928 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-20 23:51:16,928 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ.epf [2018-01-20 23:51:16,939 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-20 23:51:16,939 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-20 23:51:16,940 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-20 23:51:16,940 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-20 23:51:16,940 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-20 23:51:16,941 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-20 23:51:16,941 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-20 23:51:16,941 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-20 23:51:16,942 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-20 23:51:16,942 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-20 23:51:16,942 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-20 23:51:16,942 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-20 23:51:16,942 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-20 23:51:16,943 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-20 23:51:16,943 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-20 23:51:16,943 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-20 23:51:16,943 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-20 23:51:16,943 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-20 23:51:16,944 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-20 23:51:16,944 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-20 23:51:16,944 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-20 23:51:16,944 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-20 23:51:16,944 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-20 23:51:16,944 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-20 23:51:16,945 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-20 23:51:16,945 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-20 23:51:16,945 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-20 23:51:16,945 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-20 23:51:16,945 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-20 23:51:16,946 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-20 23:51:16,946 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-20 23:51:16,946 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-20 23:51:16,946 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-20 23:51:16,946 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-20 23:51:16,947 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-20 23:51:16,947 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-20 23:51:16,948 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-20 23:51:16,948 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-20 23:51:16,985 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-20 23:51:16,997 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-20 23:51:17,000 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-20 23:51:17,001 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-20 23:51:17,002 INFO L276 PluginConnector]: CDTParser initialized [2018-01-20 23:51:17,003 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength4_true-valid-memsafety_true-termination.c [2018-01-20 23:51:17,117 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-20 23:51:17,122 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-20 23:51:17,123 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-20 23:51:17,123 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-20 23:51:17,128 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-20 23:51:17,129 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:51:17" (1/1) ... [2018-01-20 23:51:17,132 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2463beb5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:51:17, skipping insertion in model container [2018-01-20 23:51:17,132 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:51:17" (1/1) ... [2018-01-20 23:51:17,147 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:51:17,165 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:51:17,273 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:51:17,288 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:51:17,294 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:51:17 WrapperNode [2018-01-20 23:51:17,294 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-20 23:51:17,295 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-20 23:51:17,295 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-20 23:51:17,296 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-20 23:51:17,313 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:51:17" (1/1) ... [2018-01-20 23:51:17,314 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:51:17" (1/1) ... [2018-01-20 23:51:17,325 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:51:17" (1/1) ... [2018-01-20 23:51:17,325 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:51:17" (1/1) ... [2018-01-20 23:51:17,328 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:51:17" (1/1) ... [2018-01-20 23:51:17,332 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:51:17" (1/1) ... [2018-01-20 23:51:17,333 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:51:17" (1/1) ... [2018-01-20 23:51:17,335 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-20 23:51:17,336 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-20 23:51:17,336 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-20 23:51:17,336 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-20 23:51:17,337 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:51:17" (1/1) ... No working directory specified, using /storage/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 [2018-01-20 23:51:17,396 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-20 23:51:17,397 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-20 23:51:17,397 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-20 23:51:17,397 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-20 23:51:17,397 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-20 23:51:17,397 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-20 23:51:17,397 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-20 23:51:17,398 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-20 23:51:17,398 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-20 23:51:17,398 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-20 23:51:17,398 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-20 23:51:17,398 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-20 23:51:17,398 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-20 23:51:17,597 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-20 23:51:17,598 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:51:17 BoogieIcfgContainer [2018-01-20 23:51:17,598 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-20 23:51:17,599 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-20 23:51:17,599 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-20 23:51:17,601 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-20 23:51:17,601 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.01 11:51:17" (1/3) ... [2018-01-20 23:51:17,602 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a1b71bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 11:51:17, skipping insertion in model container [2018-01-20 23:51:17,602 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:51:17" (2/3) ... [2018-01-20 23:51:17,602 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a1b71bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 11:51:17, skipping insertion in model container [2018-01-20 23:51:17,603 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:51:17" (3/3) ... [2018-01-20 23:51:17,604 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength4_true-valid-memsafety_true-termination.c [2018-01-20 23:51:17,611 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-20 23:51:17,618 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-20 23:51:17,663 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:51:17,663 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:51:17,663 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:51:17,663 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:51:17,663 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:51:17,664 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:51:17,664 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:51:17,664 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-20 23:51:17,664 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:51:17,682 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-20 23:51:17,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-20 23:51:17,687 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:51:17,688 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-20 23:51:17,689 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-20 23:51:17,694 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-20 23:51:17,697 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:51:17,743 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:17,743 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:51:17,743 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:17,744 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:51:17,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:51:17,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:51:17,797 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-20 23:51:17,803 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-20 23:51:17,809 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:51:17,809 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:51:17,810 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:51:17,810 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:51:17,810 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:51:17,810 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:51:17,810 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:51:17,810 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-20 23:51:17,810 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:51:17,811 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-20 23:51:17,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-20 23:51:17,812 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:51:17,812 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:51:17,812 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-20 23:51:17,813 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-20 23:51:17,813 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:51:17,814 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:17,814 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:51:17,814 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:17,814 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:51:17,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:17,836 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:51:17,868 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:51:17,870 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:51:17,870 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-20 23:51:17,870 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:51:17,872 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-20 23:51:17,884 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-20 23:51:17,885 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:51:17,887 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-20 23:51:17,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:51:17,919 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-20 23:51:17,919 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-20 23:51:17,921 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-20 23:51:17,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:51:17,931 INFO L225 Difference]: With dead ends: 72 [2018-01-20 23:51:17,931 INFO L226 Difference]: Without dead ends: 0 [2018-01-20 23:51:17,935 INFO L525 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 [2018-01-20 23:51:18,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-20 23:51:18,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-20 23:51:18,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-20 23:51:18,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-20 23:51:18,032 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-20 23:51:18,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:51:18,033 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-20 23:51:18,033 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-20 23:51:18,033 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-20 23:51:18,033 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-20 23:51:18,035 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:51:18,035 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:51:18,035 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:51:18,036 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:51:18,036 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:51:18,036 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:51:18,036 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:51:18,036 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-20 23:51:18,036 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:51:18,038 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-20 23:51:18,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-20 23:51:18,039 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:51:18,039 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:51:18,039 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:51:18,040 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-20 23:51:18,040 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:51:18,041 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:18,041 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:51:18,041 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:18,041 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:51:18,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:18,049 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:51:18,063 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:51:18,064 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:51:18,064 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-20 23:51:18,064 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:51:18,064 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-20 23:51:18,065 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-20 23:51:18,065 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:51:18,065 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-20 23:51:18,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:51:18,070 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-20 23:51:18,070 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-20 23:51:18,070 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-20 23:51:18,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:51:18,072 INFO L225 Difference]: With dead ends: 72 [2018-01-20 23:51:18,072 INFO L226 Difference]: Without dead ends: 37 [2018-01-20 23:51:18,072 INFO L525 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 [2018-01-20 23:51:18,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-20 23:51:18,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-20 23:51:18,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-20 23:51:18,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-20 23:51:18,082 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-20 23:51:18,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:51:18,082 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-20 23:51:18,083 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-20 23:51:18,083 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-20 23:51:18,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-20 23:51:18,083 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:51:18,083 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:51:18,084 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:51:18,084 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-20 23:51:18,084 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:51:18,085 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:18,085 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:51:18,085 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:18,085 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:51:18,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:18,095 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:51:18,133 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:51:18,133 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:51:18,133 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-20 23:51:18,134 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:51:18,135 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-20 23:51:18,135 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-20 23:51:18,135 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-20 23:51:18,135 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-20 23:51:18,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:51:18,194 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-20 23:51:18,194 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-20 23:51:18,194 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-20 23:51:18,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:51:18,197 INFO L225 Difference]: With dead ends: 66 [2018-01-20 23:51:18,198 INFO L226 Difference]: Without dead ends: 51 [2018-01-20 23:51:18,199 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-20 23:51:18,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-20 23:51:18,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-20 23:51:18,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-20 23:51:18,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-20 23:51:18,212 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-20 23:51:18,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:51:18,213 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-20 23:51:18,213 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-20 23:51:18,213 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-20 23:51:18,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-20 23:51:18,215 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:51:18,215 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:51:18,215 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:51:18,215 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-20 23:51:18,216 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:51:18,217 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:18,217 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:51:18,217 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:18,217 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:51:18,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:18,240 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:51:18,397 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:51:18,397 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:51:18,397 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-20 23:51:18,398 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:51:18,398 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-20 23:51:18,398 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-20 23:51:18,399 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-01-20 23:51:18,399 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 5 states. [2018-01-20 23:51:18,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:51:18,482 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2018-01-20 23:51:18,483 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-20 23:51:18,483 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2018-01-20 23:51:18,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:51:18,484 INFO L225 Difference]: With dead ends: 80 [2018-01-20 23:51:18,484 INFO L226 Difference]: Without dead ends: 46 [2018-01-20 23:51:18,485 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-01-20 23:51:18,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-20 23:51:18,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2018-01-20 23:51:18,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-20 23:51:18,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2018-01-20 23:51:18,492 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 31 [2018-01-20 23:51:18,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:51:18,492 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2018-01-20 23:51:18,492 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-20 23:51:18,492 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2018-01-20 23:51:18,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-20 23:51:18,494 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:51:18,494 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:51:18,494 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:51:18,494 INFO L82 PathProgramCache]: Analyzing trace with hash -151955344, now seen corresponding path program 1 times [2018-01-20 23:51:18,494 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:51:18,496 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:18,496 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:51:18,496 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:18,496 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:51:18,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:18,513 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:51:18,618 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:51:18,618 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:18,618 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:51:18,619 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 37 with the following transitions: [2018-01-20 23:51:18,621 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-20 23:51:18,669 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-20 23:51:18,669 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-20 23:51:19,969 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-20 23:51:19,970 INFO L268 AbstractInterpreter]: Visited 34 different actions 115 times. Merged at 22 different actions 56 times. Never widened. Found 9 fixpoints after 4 different actions. Largest state had 21 variables. [2018-01-20 23:51:19,984 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-20 23:51:19,984 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:19,984 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/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 [2018-01-20 23:51:19,997 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:51:19,997 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:51:20,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:20,028 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:20,110 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:51:20,111 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:20,256 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:51:20,290 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:20,290 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:51:20,300 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:51:20,300 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:51:20,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:20,340 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:20,372 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-20 23:51:20,372 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:20,482 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-20 23:51:20,485 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:51:20,485 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 4, 4] total 15 [2018-01-20 23:51:20,485 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:51:20,486 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-20 23:51:20,486 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-20 23:51:20,487 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2018-01-20 23:51:20,487 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 8 states. [2018-01-20 23:51:20,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:51:20,722 INFO L93 Difference]: Finished difference Result 87 states and 94 transitions. [2018-01-20 23:51:20,724 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-20 23:51:20,725 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2018-01-20 23:51:20,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:51:20,726 INFO L225 Difference]: With dead ends: 87 [2018-01-20 23:51:20,726 INFO L226 Difference]: Without dead ends: 51 [2018-01-20 23:51:20,727 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2018-01-20 23:51:20,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-20 23:51:20,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2018-01-20 23:51:20,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-01-20 23:51:20,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2018-01-20 23:51:20,734 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 36 [2018-01-20 23:51:20,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:51:20,735 INFO L432 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2018-01-20 23:51:20,735 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-20 23:51:20,735 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2018-01-20 23:51:20,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-01-20 23:51:20,736 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:51:20,737 INFO L322 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:51:20,737 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:51:20,737 INFO L82 PathProgramCache]: Analyzing trace with hash -524554428, now seen corresponding path program 2 times [2018-01-20 23:51:20,737 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:51:20,738 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:20,739 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:51:20,739 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:20,739 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:51:20,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:20,756 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:51:20,936 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:51:20,936 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:20,936 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:51:20,936 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:51:20,937 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:51:20,937 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:20,937 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/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 [2018-01-20 23:51:20,948 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:51:20,949 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:51:20,961 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:20,968 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:20,969 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:20,972 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:21,091 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:51:21,092 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:21,298 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:51:21,320 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:21,320 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:51:21,325 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:51:21,325 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:51:21,337 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:21,349 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:21,357 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:21,361 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:21,413 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-20 23:51:21,413 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:21,442 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-20 23:51:21,443 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:51:21,443 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 4, 4] total 18 [2018-01-20 23:51:21,443 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:51:21,444 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-20 23:51:21,444 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-20 23:51:21,444 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2018-01-20 23:51:21,445 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 10 states. [2018-01-20 23:51:21,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:51:21,577 INFO L93 Difference]: Finished difference Result 97 states and 104 transitions. [2018-01-20 23:51:21,577 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-20 23:51:21,577 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 41 [2018-01-20 23:51:21,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:51:21,578 INFO L225 Difference]: With dead ends: 97 [2018-01-20 23:51:21,578 INFO L226 Difference]: Without dead ends: 56 [2018-01-20 23:51:21,579 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 151 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=111, Invalid=351, Unknown=0, NotChecked=0, Total=462 [2018-01-20 23:51:21,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-01-20 23:51:21,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2018-01-20 23:51:21,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-01-20 23:51:21,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2018-01-20 23:51:21,583 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 41 [2018-01-20 23:51:21,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:51:21,584 INFO L432 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2018-01-20 23:51:21,584 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-20 23:51:21,584 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2018-01-20 23:51:21,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-01-20 23:51:21,585 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:51:21,585 INFO L322 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:51:21,585 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:51:21,585 INFO L82 PathProgramCache]: Analyzing trace with hash -438141712, now seen corresponding path program 3 times [2018-01-20 23:51:21,586 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:51:21,586 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:21,586 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:51:21,586 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:21,587 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:51:21,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:21,602 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:51:21,817 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:51:21,817 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:21,817 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:51:21,817 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:51:21,817 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:51:21,818 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:21,818 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/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 [2018-01-20 23:51:21,825 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:51:21,826 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:51:21,834 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:21,837 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:21,837 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:21,840 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:21,860 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-20 23:51:21,860 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:21,894 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-20 23:51:21,915 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:21,915 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:51:21,918 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:51:21,918 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:51:21,932 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:21,940 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:21,948 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:21,951 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:21,956 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-20 23:51:21,956 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:21,983 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-20 23:51:21,985 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:51:21,985 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4, 4, 4] total 11 [2018-01-20 23:51:21,985 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:51:21,985 INFO L409 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-01-20 23:51:21,986 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-01-20 23:51:21,986 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2018-01-20 23:51:21,986 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 9 states. [2018-01-20 23:51:22,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:51:22,113 INFO L93 Difference]: Finished difference Result 131 states and 146 transitions. [2018-01-20 23:51:22,114 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-20 23:51:22,114 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 46 [2018-01-20 23:51:22,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:51:22,116 INFO L225 Difference]: With dead ends: 131 [2018-01-20 23:51:22,116 INFO L226 Difference]: Without dead ends: 85 [2018-01-20 23:51:22,117 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2018-01-20 23:51:22,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-01-20 23:51:22,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 67. [2018-01-20 23:51:22,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-01-20 23:51:22,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 72 transitions. [2018-01-20 23:51:22,128 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 72 transitions. Word has length 46 [2018-01-20 23:51:22,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:51:22,129 INFO L432 AbstractCegarLoop]: Abstraction has 67 states and 72 transitions. [2018-01-20 23:51:22,129 INFO L433 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-01-20 23:51:22,129 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 72 transitions. [2018-01-20 23:51:22,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-01-20 23:51:22,133 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:51:22,133 INFO L322 BasicCegarLoop]: trace histogram [10, 8, 8, 8, 8, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:51:22,133 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:51:22,134 INFO L82 PathProgramCache]: Analyzing trace with hash 515188947, now seen corresponding path program 4 times [2018-01-20 23:51:22,134 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:51:22,134 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:22,135 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:51:22,135 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:22,135 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:51:22,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:22,158 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:51:22,366 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 5 proven. 139 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2018-01-20 23:51:22,366 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:22,366 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:51:22,367 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:51:22,367 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:51:22,367 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:22,367 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/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 [2018-01-20 23:51:22,374 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:51:22,375 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:51:22,410 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:22,414 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:22,543 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 107 proven. 38 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2018-01-20 23:51:22,543 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:22,772 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 5 proven. 139 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2018-01-20 23:51:22,793 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:22,793 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:51:22,798 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:51:22,799 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:51:22,855 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:22,861 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:22,876 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 107 proven. 38 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2018-01-20 23:51:22,876 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:23,011 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 5 proven. 139 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2018-01-20 23:51:23,013 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:51:23,013 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 20 [2018-01-20 23:51:23,013 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:51:23,014 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-20 23:51:23,014 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-20 23:51:23,014 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=270, Unknown=0, NotChecked=0, Total=380 [2018-01-20 23:51:23,014 INFO L87 Difference]: Start difference. First operand 67 states and 72 transitions. Second operand 14 states. [2018-01-20 23:51:23,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:51:23,235 INFO L93 Difference]: Finished difference Result 134 states and 145 transitions. [2018-01-20 23:51:23,235 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-20 23:51:23,235 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 82 [2018-01-20 23:51:23,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:51:23,237 INFO L225 Difference]: With dead ends: 134 [2018-01-20 23:51:23,237 INFO L226 Difference]: Without dead ends: 75 [2018-01-20 23:51:23,238 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 314 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=201, Invalid=449, Unknown=0, NotChecked=0, Total=650 [2018-01-20 23:51:23,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-01-20 23:51:23,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2018-01-20 23:51:23,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-01-20 23:51:23,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2018-01-20 23:51:23,247 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 82 [2018-01-20 23:51:23,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:51:23,247 INFO L432 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2018-01-20 23:51:23,248 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-20 23:51:23,248 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2018-01-20 23:51:23,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-01-20 23:51:23,251 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:51:23,251 INFO L322 BasicCegarLoop]: trace histogram [12, 10, 10, 10, 10, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:51:23,251 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:51:23,251 INFO L82 PathProgramCache]: Analyzing trace with hash -611097235, now seen corresponding path program 5 times [2018-01-20 23:51:23,252 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:51:23,253 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:23,253 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:51:23,253 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:23,253 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:51:23,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:23,280 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:51:23,458 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 5 proven. 210 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-01-20 23:51:23,458 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:23,458 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:51:23,458 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:51:23,458 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:51:23,459 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:23,459 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/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 [2018-01-20 23:51:23,463 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:51:23,464 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:51:23,470 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:23,472 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:23,474 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:23,475 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:23,477 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:23,481 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:23,482 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:23,484 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:23,566 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 156 proven. 60 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2018-01-20 23:51:23,566 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:23,728 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 5 proven. 210 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-01-20 23:51:23,749 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:23,749 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:51:23,752 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:51:23,752 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:51:23,761 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:23,764 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:23,771 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:23,780 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:23,791 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:23,810 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:23,818 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:23,823 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:23,835 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 156 proven. 60 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2018-01-20 23:51:23,836 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:23,950 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 5 proven. 210 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-01-20 23:51:23,952 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:51:23,953 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 23 [2018-01-20 23:51:23,953 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:51:23,953 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-20 23:51:23,953 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-20 23:51:23,953 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=361, Unknown=0, NotChecked=0, Total=506 [2018-01-20 23:51:23,954 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand 16 states. [2018-01-20 23:51:24,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:51:24,202 INFO L93 Difference]: Finished difference Result 144 states and 155 transitions. [2018-01-20 23:51:24,203 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-20 23:51:24,203 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 92 [2018-01-20 23:51:24,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:51:24,204 INFO L225 Difference]: With dead ends: 144 [2018-01-20 23:51:24,204 INFO L226 Difference]: Without dead ends: 80 [2018-01-20 23:51:24,204 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 352 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=268, Invalid=602, Unknown=0, NotChecked=0, Total=870 [2018-01-20 23:51:24,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2018-01-20 23:51:24,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 77. [2018-01-20 23:51:24,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-01-20 23:51:24,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 82 transitions. [2018-01-20 23:51:24,211 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 82 transitions. Word has length 92 [2018-01-20 23:51:24,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:51:24,212 INFO L432 AbstractCegarLoop]: Abstraction has 77 states and 82 transitions. [2018-01-20 23:51:24,212 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-20 23:51:24,212 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 82 transitions. [2018-01-20 23:51:24,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-01-20 23:51:24,214 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:51:24,214 INFO L322 BasicCegarLoop]: trace histogram [14, 12, 12, 12, 12, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:51:24,214 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:51:24,214 INFO L82 PathProgramCache]: Analyzing trace with hash -556985837, now seen corresponding path program 6 times [2018-01-20 23:51:24,214 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:51:24,215 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:24,215 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:51:24,216 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:24,216 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:51:24,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:24,239 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:51:24,445 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 5 proven. 296 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2018-01-20 23:51:24,445 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:24,445 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:51:24,445 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:51:24,445 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:51:24,445 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:24,445 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/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 [2018-01-20 23:51:24,450 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:51:24,451 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:51:24,460 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:24,462 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:24,464 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:24,466 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:24,469 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:24,470 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:24,472 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:24,496 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-20 23:51:24,496 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:24,535 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-20 23:51:24,555 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:24,555 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:51:24,558 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:51:24,558 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:51:24,569 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:24,575 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:24,586 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:24,599 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:24,617 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:24,627 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:24,632 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:24,642 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-20 23:51:24,643 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:24,693 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-20 23:51:24,695 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:51:24,695 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5, 5, 5, 5] total 16 [2018-01-20 23:51:24,695 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:51:24,695 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-20 23:51:24,696 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-20 23:51:24,696 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2018-01-20 23:51:24,696 INFO L87 Difference]: Start difference. First operand 77 states and 82 transitions. Second operand 13 states. [2018-01-20 23:51:24,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:51:24,842 INFO L93 Difference]: Finished difference Result 183 states and 202 transitions. [2018-01-20 23:51:24,842 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-20 23:51:24,842 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 102 [2018-01-20 23:51:24,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:51:24,844 INFO L225 Difference]: With dead ends: 183 [2018-01-20 23:51:24,844 INFO L226 Difference]: Without dead ends: 114 [2018-01-20 23:51:24,844 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 402 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-01-20 23:51:24,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-01-20 23:51:24,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 91. [2018-01-20 23:51:24,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-01-20 23:51:24,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2018-01-20 23:51:24,854 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 102 [2018-01-20 23:51:24,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:51:24,855 INFO L432 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2018-01-20 23:51:24,855 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-20 23:51:24,855 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2018-01-20 23:51:24,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-01-20 23:51:24,858 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:51:24,858 INFO L322 BasicCegarLoop]: trace histogram [24, 21, 21, 21, 21, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:51:24,858 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:51:24,858 INFO L82 PathProgramCache]: Analyzing trace with hash 294495146, now seen corresponding path program 7 times [2018-01-20 23:51:24,859 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:51:24,859 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:24,859 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:51:24,860 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:24,860 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:51:24,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:24,882 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:51:25,288 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 8 proven. 675 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2018-01-20 23:51:25,288 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:25,288 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:51:25,288 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:51:25,288 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:51:25,289 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:25,289 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/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 [2018-01-20 23:51:25,294 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:51:25,294 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:51:25,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:25,324 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:25,441 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 566 proven. 119 refuted. 0 times theorem prover too weak. 530 trivial. 0 not checked. [2018-01-20 23:51:25,441 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:25,656 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 8 proven. 675 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2018-01-20 23:51:25,676 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:25,676 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:51:25,679 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:51:25,679 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:51:25,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:25,751 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:25,772 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 566 proven. 119 refuted. 0 times theorem prover too weak. 530 trivial. 0 not checked. [2018-01-20 23:51:25,772 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:25,858 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 8 proven. 675 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2018-01-20 23:51:25,860 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:51:25,860 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 29 [2018-01-20 23:51:25,860 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:51:25,860 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-20 23:51:25,860 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-20 23:51:25,861 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=582, Unknown=0, NotChecked=0, Total=812 [2018-01-20 23:51:25,861 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand 20 states. [2018-01-20 23:51:26,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:51:26,082 INFO L93 Difference]: Finished difference Result 182 states and 198 transitions. [2018-01-20 23:51:26,082 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-20 23:51:26,082 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 158 [2018-01-20 23:51:26,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:51:26,083 INFO L225 Difference]: With dead ends: 182 [2018-01-20 23:51:26,083 INFO L226 Difference]: Without dead ends: 99 [2018-01-20 23:51:26,084 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 650 GetRequests, 612 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=432, Invalid=974, Unknown=0, NotChecked=0, Total=1406 [2018-01-20 23:51:26,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-01-20 23:51:26,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 96. [2018-01-20 23:51:26,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-01-20 23:51:26,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2018-01-20 23:51:26,092 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 158 [2018-01-20 23:51:26,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:51:26,092 INFO L432 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2018-01-20 23:51:26,092 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-20 23:51:26,092 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2018-01-20 23:51:26,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-01-20 23:51:26,094 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:51:26,094 INFO L322 BasicCegarLoop]: trace histogram [27, 24, 24, 24, 24, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:51:26,095 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:51:26,095 INFO L82 PathProgramCache]: Analyzing trace with hash 1051815268, now seen corresponding path program 8 times [2018-01-20 23:51:26,095 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:51:26,096 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:26,096 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:51:26,096 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:26,096 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:51:26,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:26,120 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:51:26,412 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 8 proven. 870 refuted. 0 times theorem prover too weak. 685 trivial. 0 not checked. [2018-01-20 23:51:26,413 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:26,413 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:51:26,413 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:51:26,413 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:51:26,413 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:26,413 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/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 [2018-01-20 23:51:26,418 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:51:26,418 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:51:26,430 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:26,448 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:26,451 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:26,455 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:26,598 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 724 proven. 156 refuted. 0 times theorem prover too weak. 683 trivial. 0 not checked. [2018-01-20 23:51:26,598 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:26,854 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 8 proven. 870 refuted. 0 times theorem prover too weak. 685 trivial. 0 not checked. [2018-01-20 23:51:26,874 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:26,875 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:51:26,878 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:51:26,878 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:51:26,893 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:26,923 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:26,947 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:26,953 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:26,974 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 724 proven. 156 refuted. 0 times theorem prover too weak. 683 trivial. 0 not checked. [2018-01-20 23:51:26,974 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:27,091 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 8 proven. 870 refuted. 0 times theorem prover too weak. 685 trivial. 0 not checked. [2018-01-20 23:51:27,093 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:51:27,093 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 32 [2018-01-20 23:51:27,093 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:51:27,094 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-20 23:51:27,094 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-20 23:51:27,094 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=712, Unknown=0, NotChecked=0, Total=992 [2018-01-20 23:51:27,094 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand 22 states. [2018-01-20 23:51:27,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:51:27,317 INFO L93 Difference]: Finished difference Result 192 states and 208 transitions. [2018-01-20 23:51:27,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-20 23:51:27,317 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 173 [2018-01-20 23:51:27,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:51:27,318 INFO L225 Difference]: With dead ends: 192 [2018-01-20 23:51:27,318 INFO L226 Difference]: Without dead ends: 104 [2018-01-20 23:51:27,319 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 712 GetRequests, 670 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=529, Invalid=1193, Unknown=0, NotChecked=0, Total=1722 [2018-01-20 23:51:27,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2018-01-20 23:51:27,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 101. [2018-01-20 23:51:27,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-01-20 23:51:27,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 108 transitions. [2018-01-20 23:51:27,325 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 108 transitions. Word has length 173 [2018-01-20 23:51:27,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:51:27,326 INFO L432 AbstractCegarLoop]: Abstraction has 101 states and 108 transitions. [2018-01-20 23:51:27,326 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-20 23:51:27,326 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 108 transitions. [2018-01-20 23:51:27,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-01-20 23:51:27,329 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:51:27,329 INFO L322 BasicCegarLoop]: trace histogram [30, 27, 27, 27, 27, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:51:27,329 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:51:27,329 INFO L82 PathProgramCache]: Analyzing trace with hash 1142155370, now seen corresponding path program 9 times [2018-01-20 23:51:27,329 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:51:27,330 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:27,330 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:51:27,330 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:27,330 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:51:27,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:27,351 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:51:27,618 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 8 proven. 1090 refuted. 0 times theorem prover too weak. 858 trivial. 0 not checked. [2018-01-20 23:51:27,618 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:27,619 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:51:27,619 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:51:27,619 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:51:27,619 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:27,619 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/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 [2018-01-20 23:51:27,624 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:51:27,624 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:51:27,637 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:27,640 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:27,643 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:27,653 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:27,654 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:27,657 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:27,696 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-20 23:51:27,697 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:27,766 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-20 23:51:27,785 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:27,785 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:51:27,788 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:51:27,788 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:51:27,803 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:27,810 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:27,822 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:27,840 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:27,850 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:27,855 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:27,879 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-20 23:51:27,879 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:27,906 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-20 23:51:27,908 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:51:27,908 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 6, 6, 6, 6] total 21 [2018-01-20 23:51:27,908 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:51:27,908 INFO L409 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-01-20 23:51:27,908 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-01-20 23:51:27,909 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2018-01-20 23:51:27,909 INFO L87 Difference]: Start difference. First operand 101 states and 108 transitions. Second operand 17 states. [2018-01-20 23:51:28,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:51:28,038 INFO L93 Difference]: Finished difference Result 236 states and 260 transitions. [2018-01-20 23:51:28,038 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-20 23:51:28,038 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 188 [2018-01-20 23:51:28,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:51:28,040 INFO L225 Difference]: With dead ends: 236 [2018-01-20 23:51:28,040 INFO L226 Difference]: Without dead ends: 143 [2018-01-20 23:51:28,041 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 764 GetRequests, 744 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=124, Invalid=338, Unknown=0, NotChecked=0, Total=462 [2018-01-20 23:51:28,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2018-01-20 23:51:28,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 115. [2018-01-20 23:51:28,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-01-20 23:51:28,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-01-20 23:51:28,050 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 188 [2018-01-20 23:51:28,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:51:28,050 INFO L432 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-01-20 23:51:28,050 INFO L433 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-01-20 23:51:28,050 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-01-20 23:51:28,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2018-01-20 23:51:28,054 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:51:28,055 INFO L322 BasicCegarLoop]: trace histogram [44, 40, 40, 40, 40, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:51:28,055 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:51:28,055 INFO L82 PathProgramCache]: Analyzing trace with hash 132824627, now seen corresponding path program 10 times [2018-01-20 23:51:28,055 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:51:28,056 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:28,056 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:51:28,056 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:28,056 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:51:28,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:28,087 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:51:28,388 WARN L146 SmtUtils]: Spent 114ms on a formula simplification. DAG size of input: 13 DAG size of output 12 [2018-01-20 23:51:28,508 WARN L146 SmtUtils]: Spent 105ms on a formula simplification. DAG size of input: 13 DAG size of output 12 [2018-01-20 23:51:28,815 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 11 proven. 1880 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2018-01-20 23:51:28,815 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:28,815 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:51:28,815 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:51:28,815 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:51:28,815 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:28,816 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/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 [2018-01-20 23:51:28,825 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:51:28,826 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:51:28,879 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:28,883 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:29,073 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 1649 proven. 245 refuted. 0 times theorem prover too weak. 2400 trivial. 0 not checked. [2018-01-20 23:51:29,074 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:29,460 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 11 proven. 1880 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2018-01-20 23:51:29,481 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:29,481 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:51:29,484 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:51:29,484 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:51:29,810 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:29,819 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:29,857 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 1649 proven. 245 refuted. 0 times theorem prover too weak. 2400 trivial. 0 not checked. [2018-01-20 23:51:29,858 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:30,061 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 11 proven. 1880 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2018-01-20 23:51:30,064 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:51:30,064 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 38 [2018-01-20 23:51:30,064 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:51:30,065 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-20 23:51:30,065 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-20 23:51:30,065 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=1011, Unknown=0, NotChecked=0, Total=1406 [2018-01-20 23:51:30,066 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 26 states. [2018-01-20 23:51:30,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:51:30,453 INFO L93 Difference]: Finished difference Result 230 states and 251 transitions. [2018-01-20 23:51:30,454 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-20 23:51:30,454 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 264 [2018-01-20 23:51:30,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:51:30,457 INFO L225 Difference]: With dead ends: 230 [2018-01-20 23:51:30,457 INFO L226 Difference]: Without dead ends: 123 [2018-01-20 23:51:30,458 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1080 GetRequests, 1030 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=753, Invalid=1697, Unknown=0, NotChecked=0, Total=2450 [2018-01-20 23:51:30,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-01-20 23:51:30,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 120. [2018-01-20 23:51:30,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-01-20 23:51:30,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 129 transitions. [2018-01-20 23:51:30,468 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 129 transitions. Word has length 264 [2018-01-20 23:51:30,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:51:30,469 INFO L432 AbstractCegarLoop]: Abstraction has 120 states and 129 transitions. [2018-01-20 23:51:30,469 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-20 23:51:30,469 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 129 transitions. [2018-01-20 23:51:30,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2018-01-20 23:51:30,471 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:51:30,471 INFO L322 BasicCegarLoop]: trace histogram [48, 44, 44, 44, 44, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:51:30,471 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:51:30,471 INFO L82 PathProgramCache]: Analyzing trace with hash -171303065, now seen corresponding path program 11 times [2018-01-20 23:51:30,471 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:51:30,472 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:30,472 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:51:30,473 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:30,473 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:51:30,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:30,503 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:51:31,084 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 11 proven. 2259 refuted. 0 times theorem prover too weak. 2886 trivial. 0 not checked. [2018-01-20 23:51:31,084 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:31,117 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:51:31,117 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:51:31,117 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:51:31,117 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:31,117 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/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 [2018-01-20 23:51:31,122 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:51:31,122 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:51:31,136 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:31,137 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:31,139 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:31,142 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:31,145 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:31,148 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:31,152 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:31,157 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:31,162 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:31,168 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:31,174 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:31,182 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:31,191 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:31,193 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:31,197 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:31,409 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 1976 proven. 297 refuted. 0 times theorem prover too weak. 2883 trivial. 0 not checked. [2018-01-20 23:51:31,409 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:31,955 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 11 proven. 2259 refuted. 0 times theorem prover too weak. 2886 trivial. 0 not checked. [2018-01-20 23:51:31,975 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:31,975 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:51:31,978 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:51:31,978 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:51:31,999 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:32,002 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:32,010 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:32,022 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:32,041 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:32,069 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:32,109 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:32,160 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:32,239 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:32,362 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:32,530 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:32,761 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:33,057 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:33,102 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:33,110 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:33,165 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 1976 proven. 297 refuted. 0 times theorem prover too weak. 2883 trivial. 0 not checked. [2018-01-20 23:51:33,165 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:33,310 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 11 proven. 2259 refuted. 0 times theorem prover too weak. 2886 trivial. 0 not checked. [2018-01-20 23:51:33,312 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:51:33,313 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 41 [2018-01-20 23:51:33,313 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:51:33,313 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-20 23:51:33,314 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-20 23:51:33,314 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2018-01-20 23:51:33,314 INFO L87 Difference]: Start difference. First operand 120 states and 129 transitions. Second operand 28 states. [2018-01-20 23:51:33,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:51:33,703 INFO L93 Difference]: Finished difference Result 240 states and 261 transitions. [2018-01-20 23:51:33,703 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-20 23:51:33,703 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 284 [2018-01-20 23:51:33,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:51:33,705 INFO L225 Difference]: With dead ends: 240 [2018-01-20 23:51:33,705 INFO L226 Difference]: Without dead ends: 128 [2018-01-20 23:51:33,706 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1162 GetRequests, 1108 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=880, Invalid=1982, Unknown=0, NotChecked=0, Total=2862 [2018-01-20 23:51:33,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-01-20 23:51:33,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 125. [2018-01-20 23:51:33,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2018-01-20 23:51:33,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 134 transitions. [2018-01-20 23:51:33,714 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 134 transitions. Word has length 284 [2018-01-20 23:51:33,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:51:33,714 INFO L432 AbstractCegarLoop]: Abstraction has 125 states and 134 transitions. [2018-01-20 23:51:33,714 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-20 23:51:33,714 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 134 transitions. [2018-01-20 23:51:33,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2018-01-20 23:51:33,716 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:51:33,716 INFO L322 BasicCegarLoop]: trace histogram [52, 48, 48, 48, 48, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:51:33,716 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:51:33,717 INFO L82 PathProgramCache]: Analyzing trace with hash -2029948749, now seen corresponding path program 12 times [2018-01-20 23:51:33,717 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:51:33,717 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:33,718 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:51:33,718 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:33,718 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:51:33,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:33,747 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:51:34,205 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 11 proven. 2673 refuted. 0 times theorem prover too weak. 3414 trivial. 0 not checked. [2018-01-20 23:51:34,206 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:34,206 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:51:34,206 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:51:34,206 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:51:34,206 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:34,206 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/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 [2018-01-20 23:51:34,213 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:51:34,213 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:51:34,235 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:34,237 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:34,243 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:34,246 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:34,251 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:34,255 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:34,262 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:34,268 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:34,274 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:34,275 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:34,278 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:34,346 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-20 23:51:34,346 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:34,443 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-20 23:51:34,464 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:34,464 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:51:34,467 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:51:34,467 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:51:34,500 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:34,510 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:34,527 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:34,548 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:34,575 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:34,602 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:34,639 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:34,718 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:34,983 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:51:35,008 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:35,015 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:35,072 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-20 23:51:35,073 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:35,155 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-20 23:51:35,157 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:51:35,158 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 7, 7, 7, 7] total 26 [2018-01-20 23:51:35,158 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:51:35,158 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-20 23:51:35,159 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-20 23:51:35,159 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=478, Unknown=0, NotChecked=0, Total=650 [2018-01-20 23:51:35,159 INFO L87 Difference]: Start difference. First operand 125 states and 134 transitions. Second operand 21 states. [2018-01-20 23:51:35,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:51:35,319 INFO L93 Difference]: Finished difference Result 289 states and 318 transitions. [2018-01-20 23:51:35,319 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-20 23:51:35,319 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 304 [2018-01-20 23:51:35,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:51:35,320 INFO L225 Difference]: With dead ends: 289 [2018-01-20 23:51:35,320 INFO L226 Difference]: Without dead ends: 172 [2018-01-20 23:51:35,321 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1231 GetRequests, 1206 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=187, Invalid=515, Unknown=0, NotChecked=0, Total=702 [2018-01-20 23:51:35,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-01-20 23:51:35,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 139. [2018-01-20 23:51:35,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-01-20 23:51:35,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 150 transitions. [2018-01-20 23:51:35,329 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 150 transitions. Word has length 304 [2018-01-20 23:51:35,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:51:35,330 INFO L432 AbstractCegarLoop]: Abstraction has 139 states and 150 transitions. [2018-01-20 23:51:35,330 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-20 23:51:35,330 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 150 transitions. [2018-01-20 23:51:35,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 401 [2018-01-20 23:51:35,333 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:51:35,333 INFO L322 BasicCegarLoop]: trace histogram [70, 65, 65, 65, 65, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:51:35,333 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:51:35,333 INFO L82 PathProgramCache]: Analyzing trace with hash 1350287972, now seen corresponding path program 13 times [2018-01-20 23:51:35,333 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:51:35,334 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:35,334 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:51:35,334 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:35,335 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:51:35,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:35,370 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:51:36,106 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 14 proven. 4024 refuted. 0 times theorem prover too weak. 7132 trivial. 0 not checked. [2018-01-20 23:51:36,107 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:36,120 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:51:36,120 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:51:36,120 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:51:36,120 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:36,120 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/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 [2018-01-20 23:51:36,126 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:51:36,126 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:51:36,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:36,206 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:36,968 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 3626 proven. 416 refuted. 0 times theorem prover too weak. 7128 trivial. 0 not checked. [2018-01-20 23:51:36,968 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:37,806 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 14 proven. 4024 refuted. 0 times theorem prover too weak. 7132 trivial. 0 not checked. [2018-01-20 23:51:37,825 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:37,825 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:51:37,828 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:51:37,828 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:51:37,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:37,979 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:38,052 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 3626 proven. 416 refuted. 0 times theorem prover too weak. 7128 trivial. 0 not checked. [2018-01-20 23:51:38,052 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:38,242 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 14 proven. 4024 refuted. 0 times theorem prover too weak. 7132 trivial. 0 not checked. [2018-01-20 23:51:38,243 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:51:38,244 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 47 [2018-01-20 23:51:38,244 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:51:38,245 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-20 23:51:38,245 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-20 23:51:38,246 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=605, Invalid=1557, Unknown=0, NotChecked=0, Total=2162 [2018-01-20 23:51:38,246 INFO L87 Difference]: Start difference. First operand 139 states and 150 transitions. Second operand 32 states. [2018-01-20 23:51:38,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:51:38,629 INFO L93 Difference]: Finished difference Result 278 states and 304 transitions. [2018-01-20 23:51:38,629 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-20 23:51:38,629 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 400 [2018-01-20 23:51:38,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:51:38,631 INFO L225 Difference]: With dead ends: 278 [2018-01-20 23:51:38,631 INFO L226 Difference]: Without dead ends: 147 [2018-01-20 23:51:38,633 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1630 GetRequests, 1568 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 575 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1164, Invalid=2618, Unknown=0, NotChecked=0, Total=3782 [2018-01-20 23:51:38,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-01-20 23:51:38,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 144. [2018-01-20 23:51:38,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-01-20 23:51:38,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 155 transitions. [2018-01-20 23:51:38,642 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 155 transitions. Word has length 400 [2018-01-20 23:51:38,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:51:38,642 INFO L432 AbstractCegarLoop]: Abstraction has 144 states and 155 transitions. [2018-01-20 23:51:38,643 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-20 23:51:38,643 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 155 transitions. [2018-01-20 23:51:38,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2018-01-20 23:51:38,646 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:51:38,646 INFO L322 BasicCegarLoop]: trace histogram [75, 70, 70, 70, 70, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:51:38,646 INFO L371 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:51:38,646 INFO L82 PathProgramCache]: Analyzing trace with hash -1570210812, now seen corresponding path program 14 times [2018-01-20 23:51:38,646 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:51:38,647 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:38,647 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:51:38,647 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:38,647 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:51:38,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:38,686 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:51:39,538 WARN L146 SmtUtils]: Spent 114ms on a formula simplification. DAG size of input: 13 DAG size of output 12 [2018-01-20 23:51:39,779 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 14 proven. 4647 refuted. 0 times theorem prover too weak. 8234 trivial. 0 not checked. [2018-01-20 23:51:39,779 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:39,779 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:51:39,779 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:51:39,779 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:51:39,779 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:39,779 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/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 [2018-01-20 23:51:39,784 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:51:39,784 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:51:39,804 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:39,841 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:39,849 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:39,856 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:40,218 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 4182 proven. 483 refuted. 0 times theorem prover too weak. 8230 trivial. 0 not checked. [2018-01-20 23:51:40,218 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:41,347 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 14 proven. 4647 refuted. 0 times theorem prover too weak. 8234 trivial. 0 not checked. [2018-01-20 23:51:41,378 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:41,378 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:51:41,381 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:51:41,382 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:51:41,410 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:41,493 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:51:41,548 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:41,559 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:41,649 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 4182 proven. 483 refuted. 0 times theorem prover too weak. 8230 trivial. 0 not checked. [2018-01-20 23:51:41,649 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:41,862 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 14 proven. 4647 refuted. 0 times theorem prover too weak. 8234 trivial. 0 not checked. [2018-01-20 23:51:41,863 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:51:41,864 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 50 [2018-01-20 23:51:41,864 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:51:41,865 INFO L409 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-01-20 23:51:41,865 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-01-20 23:51:41,865 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=685, Invalid=1765, Unknown=0, NotChecked=0, Total=2450 [2018-01-20 23:51:41,865 INFO L87 Difference]: Start difference. First operand 144 states and 155 transitions. Second operand 34 states. [2018-01-20 23:51:42,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:51:42,326 INFO L93 Difference]: Finished difference Result 288 states and 314 transitions. [2018-01-20 23:51:42,326 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-20 23:51:42,326 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 425 [2018-01-20 23:51:42,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:51:42,327 INFO L225 Difference]: With dead ends: 288 [2018-01-20 23:51:42,327 INFO L226 Difference]: Without dead ends: 152 [2018-01-20 23:51:42,328 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1732 GetRequests, 1666 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 654 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1321, Invalid=2969, Unknown=0, NotChecked=0, Total=4290 [2018-01-20 23:51:42,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2018-01-20 23:51:42,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 149. [2018-01-20 23:51:42,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-01-20 23:51:42,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 160 transitions. [2018-01-20 23:51:42,334 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 160 transitions. Word has length 425 [2018-01-20 23:51:42,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:51:42,334 INFO L432 AbstractCegarLoop]: Abstraction has 149 states and 160 transitions. [2018-01-20 23:51:42,334 INFO L433 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-01-20 23:51:42,334 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 160 transitions. [2018-01-20 23:51:42,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2018-01-20 23:51:42,336 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:51:42,336 INFO L322 BasicCegarLoop]: trace histogram [80, 75, 75, 75, 75, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:51:42,336 INFO L371 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:51:42,336 INFO L82 PathProgramCache]: Analyzing trace with hash -877517212, now seen corresponding path program 15 times [2018-01-20 23:51:42,337 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:51:42,337 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:42,337 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:51:42,337 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:51:42,337 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:51:42,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:51:42,364 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:51:42,756 WARN L146 SmtUtils]: Spent 113ms on a formula simplification. DAG size of input: 13 DAG size of output 12 [2018-01-20 23:51:43,183 INFO L134 CoverageAnalysis]: Checked inductivity of 14745 backedges. 14 proven. 5315 refuted. 0 times theorem prover too weak. 9416 trivial. 0 not checked. [2018-01-20 23:51:43,183 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:43,183 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:51:43,183 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:51:43,183 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:51:43,183 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:43,183 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/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 [2018-01-20 23:51:43,190 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:51:43,190 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:51:43,216 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:43,219 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:43,223 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:43,227 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:43,232 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:43,236 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:43,241 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:43,245 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:43,252 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:43,259 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:43,266 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:43,273 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:43,282 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:43,290 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:43,300 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:43,314 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:43,324 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:43,326 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:51:43,331 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:51:43,924 INFO L134 CoverageAnalysis]: Checked inductivity of 14745 backedges. 4778 proven. 555 refuted. 0 times theorem prover too weak. 9412 trivial. 0 not checked. [2018-01-20 23:51:43,925 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:51:44,799 INFO L134 CoverageAnalysis]: Checked inductivity of 14745 backedges. 4778 proven. 555 refuted. 0 times theorem prover too weak. 9412 trivial. 0 not checked. [2018-01-20 23:51:44,819 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:51:44,820 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:51:44,823 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:51:44,823 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:51:44,855 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:44,863 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:44,876 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:44,895 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:44,932 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:45,003 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:45,121 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:45,295 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:45,573 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:46,257 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:46,890 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:47,834 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:51:59,874 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown