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_mostprecise.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength5_true-valid-memsafety.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 03:22:05,003 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 03:22:05,005 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 03:22:05,022 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 03:22:05,022 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 03:22:05,023 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 03:22:05,024 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 03:22:05,028 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 03:22:05,030 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 03:22:05,031 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 03:22:05,032 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 03:22:05,032 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 03:22:05,033 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 03:22:05,034 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 03:22:05,035 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 03:22:05,038 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 03:22:05,040 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 03:22:05,042 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 03:22:05,044 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 03:22:05,045 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 03:22:05,048 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 03:22:05,054 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 03:22:05,055 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 03:22:05,055 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_mostprecise.epf [2018-01-21 03:22:05,085 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 03:22:05,085 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 03:22:05,086 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 03:22:05,086 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 03:22:05,086 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 03:22:05,087 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 03:22:05,087 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 03:22:05,087 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-21 03:22:05,087 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 03:22:05,088 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 03:22:05,088 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 03:22:05,088 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 03:22:05,089 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 03:22:05,089 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 03:22:05,089 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 03:22:05,089 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 03:22:05,089 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 03:22:05,090 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 03:22:05,090 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 03:22:05,090 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 03:22:05,090 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 03:22:05,091 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 03:22:05,091 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 03:22:05,091 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 03:22:05,091 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 03:22:05,091 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 03:22:05,092 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 03:22:05,092 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 03:22:05,092 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 03:22:05,092 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 03:22:05,093 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 03:22:05,093 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 03:22:05,093 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 03:22:05,093 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 03:22:05,093 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 03:22:05,094 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 03:22:05,094 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 03:22:05,094 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 03:22:05,095 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 03:22:05,095 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 03:22:05,131 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 03:22:05,179 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 03:22:05,183 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 03:22:05,185 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 03:22:05,185 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 03:22:05,186 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength5_true-valid-memsafety.c [2018-01-21 03:22:05,317 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 03:22:05,321 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 03:22:05,322 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 03:22:05,322 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 03:22:05,328 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 03:22:05,329 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 03:22:05" (1/1) ... [2018-01-21 03:22:05,331 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@64aec2c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:05, skipping insertion in model container [2018-01-21 03:22:05,332 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 03:22:05" (1/1) ... [2018-01-21 03:22:05,345 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 03:22:05,361 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 03:22:05,477 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 03:22:05,499 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 03:22:05,506 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:05 WrapperNode [2018-01-21 03:22:05,507 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 03:22:05,508 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 03:22:05,508 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 03:22:05,508 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 03:22:05,520 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:05" (1/1) ... [2018-01-21 03:22:05,520 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:05" (1/1) ... [2018-01-21 03:22:05,528 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:05" (1/1) ... [2018-01-21 03:22:05,528 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:05" (1/1) ... [2018-01-21 03:22:05,532 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:05" (1/1) ... [2018-01-21 03:22:05,535 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:05" (1/1) ... [2018-01-21 03:22:05,537 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:05" (1/1) ... [2018-01-21 03:22:05,539 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 03:22:05,540 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 03:22:05,540 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 03:22:05,540 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 03:22:05,541 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:05" (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 [2018-01-21 03:22:05,636 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 03:22:05,637 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 03:22:05,637 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 03:22:05,637 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 03:22:05,637 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 03:22:05,637 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 03:22:05,637 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 03:22:05,638 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 03:22:05,638 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 03:22:05,638 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 03:22:05,638 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 03:22:05,638 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 03:22:05,638 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 03:22:05,824 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 03:22:05,825 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 03:22:05 BoogieIcfgContainer [2018-01-21 03:22:05,825 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 03:22:05,826 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 03:22:05,826 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 03:22:05,828 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 03:22:05,828 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 03:22:05" (1/3) ... [2018-01-21 03:22:05,829 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b422080 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 03:22:05, skipping insertion in model container [2018-01-21 03:22:05,829 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:22:05" (2/3) ... [2018-01-21 03:22:05,829 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b422080 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 03:22:05, skipping insertion in model container [2018-01-21 03:22:05,829 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 03:22:05" (3/3) ... [2018-01-21 03:22:05,831 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength5_true-valid-memsafety.c [2018-01-21 03:22:05,838 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 03:22:05,844 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 03:22:05,893 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:22:05,904 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:22:05,904 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:22:05,904 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:22:05,905 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:22:05,905 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:22:05,905 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:22:05,905 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 03:22:05,906 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:22:05,925 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 03:22:05,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 03:22:05,931 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:05,932 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 03:22:05,933 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 03:22:05,939 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-21 03:22:05,944 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:06,005 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:06,006 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:06,006 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:06,007 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:06,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 03:22:06,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 03:22:06,111 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 03:22:06,120 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 03:22:06,131 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:22:06,131 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:22:06,131 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:22:06,132 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:22:06,132 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:22:06,132 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:22:06,132 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:22:06,132 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 03:22:06,132 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:22:06,134 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 03:22:06,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 03:22:06,136 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:06,136 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:22:06,136 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 03:22:06,137 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-21 03:22:06,137 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:06,138 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:06,138 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:06,139 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:06,139 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:06,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:06,170 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:06,208 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:22:06,209 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:22:06,210 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 03:22:06,210 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:22:06,212 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 03:22:06,225 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 03:22:06,226 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 03:22:06,228 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 03:22:06,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:06,261 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 03:22:06,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 03:22:06,263 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 03:22:06,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:06,278 INFO L225 Difference]: With dead ends: 72 [2018-01-21 03:22:06,279 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 03:22:06,284 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 [2018-01-21 03:22:06,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 03:22:06,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 03:22:06,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 03:22:06,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 03:22:06,427 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 03:22:06,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:06,427 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 03:22:06,428 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 03:22:06,428 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 03:22:06,428 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 03:22:06,431 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:22:06,432 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:22:06,432 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:22:06,432 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:22:06,432 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:22:06,432 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:22:06,432 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:22:06,433 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 03:22:06,433 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:22:06,435 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 03:22:06,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 03:22:06,437 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:06,437 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:22:06,437 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:06,437 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-21 03:22:06,437 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:06,439 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:06,439 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:06,439 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:06,439 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:06,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:06,451 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:06,466 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:22:06,467 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:22:06,467 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 03:22:06,467 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:22:06,468 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 03:22:06,468 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 03:22:06,468 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 03:22:06,468 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 03:22:06,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:06,475 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 03:22:06,475 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 03:22:06,475 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 03:22:06,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:06,477 INFO L225 Difference]: With dead ends: 72 [2018-01-21 03:22:06,477 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 03:22:06,478 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 [2018-01-21 03:22:06,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 03:22:06,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 03:22:06,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 03:22:06,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-21 03:22:06,491 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-21 03:22:06,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:06,491 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-21 03:22:06,492 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 03:22:06,492 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-21 03:22:06,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 03:22:06,493 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:06,493 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:22:06,493 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:06,493 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-21 03:22:06,494 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:06,495 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:06,495 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:06,495 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:06,495 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:06,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:06,510 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:06,555 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:22:06,556 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:22:06,556 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 03:22:06,556 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:22:06,558 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 03:22:06,559 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 03:22:06,559 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 03:22:06,559 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-21 03:22:06,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:06,645 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-21 03:22:06,645 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 03:22:06,645 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 03:22:06,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:06,649 INFO L225 Difference]: With dead ends: 66 [2018-01-21 03:22:06,650 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 03:22:06,651 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 [2018-01-21 03:22:06,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 03:22:06,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-21 03:22:06,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 03:22:06,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-21 03:22:06,666 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-21 03:22:06,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:06,667 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-21 03:22:06,667 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 03:22:06,667 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-21 03:22:06,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 03:22:06,668 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:06,668 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] [2018-01-21 03:22:06,669 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:06,669 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-21 03:22:06,669 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:06,670 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:06,670 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:06,670 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:06,670 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:06,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:06,689 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:06,979 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:22:06,979 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:06,980 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:06,981 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 32 with the following transitions: [2018-01-21 03:22:06,983 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [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] [2018-01-21 03:22:07,053 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 03:22:07,053 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 03:22:10,914 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 03:22:10,915 INFO L268 AbstractInterpreter]: Visited 30 different actions 82 times. Merged at 14 different actions 31 times. Never widened. Found 4 fixpoints after 3 different actions. Largest state had 18 variables. [2018-01-21 03:22:10,973 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 03:22:10,974 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:10,974 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 [2018-01-21 03:22:10,989 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:10,989 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:22:11,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:11,036 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:11,104 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:22:11,104 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:11,428 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:22:11,463 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:11,463 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 [2018-01-21 03:22:11,471 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:11,471 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:22:11,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:11,513 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:11,522 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:22:11,523 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:11,570 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:22:11,575 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:11,575 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 4, 4, 4, 4] total 12 [2018-01-21 03:22:11,575 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:11,577 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 03:22:11,580 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 03:22:11,581 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2018-01-21 03:22:11,581 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 10 states. [2018-01-21 03:22:12,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:12,104 INFO L93 Difference]: Finished difference Result 96 states and 112 transitions. [2018-01-21 03:22:12,104 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 03:22:12,104 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2018-01-21 03:22:12,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:12,107 INFO L225 Difference]: With dead ends: 96 [2018-01-21 03:22:12,107 INFO L226 Difference]: Without dead ends: 79 [2018-01-21 03:22:12,108 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=71, Invalid=201, Unknown=0, NotChecked=0, Total=272 [2018-01-21 03:22:12,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-01-21 03:22:12,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 50. [2018-01-21 03:22:12,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-01-21 03:22:12,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2018-01-21 03:22:12,119 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 31 [2018-01-21 03:22:12,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:12,119 INFO L432 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2018-01-21 03:22:12,119 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 03:22:12,119 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2018-01-21 03:22:12,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-01-21 03:22:12,122 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:12,122 INFO L322 BasicCegarLoop]: trace histogram [3, 2, 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] [2018-01-21 03:22:12,122 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:12,123 INFO L82 PathProgramCache]: Analyzing trace with hash 1947199059, now seen corresponding path program 2 times [2018-01-21 03:22:12,123 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:12,124 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:12,124 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:12,124 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:12,125 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:12,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:12,146 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:12,238 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-21 03:22:12,238 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:12,239 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:12,239 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:12,239 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:12,239 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:12,239 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) [2018-01-21 03:22:12,260 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:22:12,260 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:12,284 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:12,308 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:12,316 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:12,320 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:12,401 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-21 03:22:12,402 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:12,547 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-21 03:22:12,585 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 03:22:12,585 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5] total 10 [2018-01-21 03:22:12,585 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:22:12,588 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 03:22:12,589 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 03:22:12,589 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2018-01-21 03:22:12,589 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand 6 states. [2018-01-21 03:22:12,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:12,695 INFO L93 Difference]: Finished difference Result 98 states and 109 transitions. [2018-01-21 03:22:12,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 03:22:12,695 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 42 [2018-01-21 03:22:12,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:12,696 INFO L225 Difference]: With dead ends: 98 [2018-01-21 03:22:12,697 INFO L226 Difference]: Without dead ends: 63 [2018-01-21 03:22:12,697 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 76 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-01-21 03:22:12,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-01-21 03:22:12,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 55. [2018-01-21 03:22:12,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-01-21 03:22:12,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 61 transitions. [2018-01-21 03:22:12,705 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 61 transitions. Word has length 42 [2018-01-21 03:22:12,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:12,706 INFO L432 AbstractCegarLoop]: Abstraction has 55 states and 61 transitions. [2018-01-21 03:22:12,706 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 03:22:12,706 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 61 transitions. [2018-01-21 03:22:12,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-21 03:22:12,707 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:12,707 INFO L322 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1] [2018-01-21 03:22:12,707 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:12,707 INFO L82 PathProgramCache]: Analyzing trace with hash 84514625, now seen corresponding path program 1 times [2018-01-21 03:22:12,708 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:12,709 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:12,709 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:12,709 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:12,709 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:12,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:12,739 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:12,799 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 03:22:12,799 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:12,799 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:12,799 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 48 with the following transitions: [2018-01-21 03:22:12,800 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] [2018-01-21 03:22:12,803 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 03:22:12,803 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 03:22:14,840 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 03:22:14,841 INFO L268 AbstractInterpreter]: Visited 34 different actions 110 times. Merged at 22 different actions 51 times. Never widened. Found 9 fixpoints after 5 different actions. Largest state had 21 variables. [2018-01-21 03:22:14,883 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 03:22:14,883 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:14,883 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:14,898 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:14,898 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:22:14,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:14,936 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:14,976 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 03:22:14,977 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:15,107 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 03:22:15,129 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:15,129 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 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 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:15,134 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:15,134 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:22:15,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:15,178 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:15,192 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 03:22:15,192 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:15,262 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 03:22:15,265 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:15,265 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 9 [2018-01-21 03:22:15,265 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:15,266 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 03:22:15,267 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 03:22:15,267 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 03:22:15,268 INFO L87 Difference]: Start difference. First operand 55 states and 61 transitions. Second operand 6 states. [2018-01-21 03:22:15,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:15,381 INFO L93 Difference]: Finished difference Result 105 states and 119 transitions. [2018-01-21 03:22:15,382 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 03:22:15,382 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 47 [2018-01-21 03:22:15,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:15,383 INFO L225 Difference]: With dead ends: 105 [2018-01-21 03:22:15,384 INFO L226 Difference]: Without dead ends: 84 [2018-01-21 03:22:15,384 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 03:22:15,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-01-21 03:22:15,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 64. [2018-01-21 03:22:15,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-01-21 03:22:15,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2018-01-21 03:22:15,394 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 47 [2018-01-21 03:22:15,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:15,394 INFO L432 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2018-01-21 03:22:15,394 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 03:22:15,394 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2018-01-21 03:22:15,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-01-21 03:22:15,396 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:15,397 INFO L322 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:22:15,397 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:15,397 INFO L82 PathProgramCache]: Analyzing trace with hash 1267511486, now seen corresponding path program 2 times [2018-01-21 03:22:15,397 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:15,398 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:15,398 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:15,398 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:15,399 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:15,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:15,422 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:15,532 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 03:22:15,532 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:15,532 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:15,533 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:15,533 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:15,533 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:15,533 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:15,544 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:22:15,545 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:22:15,556 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:15,567 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:15,569 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:15,573 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:15,666 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 42 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-21 03:22:15,667 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:15,880 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 42 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-21 03:22:15,904 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:15,904 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 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 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:15,908 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:22:15,908 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:22:15,924 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:15,952 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:15,965 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:15,970 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:16,007 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 03:22:16,007 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:16,070 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 03:22:16,072 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:16,073 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8, 6, 6] total 19 [2018-01-21 03:22:16,073 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:16,073 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-21 03:22:16,076 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-21 03:22:16,077 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2018-01-21 03:22:16,077 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand 12 states. [2018-01-21 03:22:16,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:16,425 INFO L93 Difference]: Finished difference Result 172 states and 198 transitions. [2018-01-21 03:22:16,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 03:22:16,425 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 63 [2018-01-21 03:22:16,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:16,427 INFO L225 Difference]: With dead ends: 172 [2018-01-21 03:22:16,427 INFO L226 Difference]: Without dead ends: 128 [2018-01-21 03:22:16,427 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 234 SyntacticMatches, 5 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=129, Invalid=423, Unknown=0, NotChecked=0, Total=552 [2018-01-21 03:22:16,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-01-21 03:22:16,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 89. [2018-01-21 03:22:16,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-01-21 03:22:16,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 101 transitions. [2018-01-21 03:22:16,438 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 101 transitions. Word has length 63 [2018-01-21 03:22:16,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:16,438 INFO L432 AbstractCegarLoop]: Abstraction has 89 states and 101 transitions. [2018-01-21 03:22:16,438 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-21 03:22:16,438 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 101 transitions. [2018-01-21 03:22:16,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-01-21 03:22:16,440 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:16,441 INFO L322 BasicCegarLoop]: trace histogram [9, 5, 5, 5, 5, 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] [2018-01-21 03:22:16,441 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:16,441 INFO L82 PathProgramCache]: Analyzing trace with hash 86499937, now seen corresponding path program 3 times [2018-01-21 03:22:16,441 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:16,442 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:16,442 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:16,442 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:16,442 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:16,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:16,471 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:16,576 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-01-21 03:22:16,576 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:16,576 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:16,576 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:16,576 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:16,576 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:16,576 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:16,583 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:22:16,583 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:22:16,594 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:16,598 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:16,607 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:16,611 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:16,612 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:16,616 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:16,652 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-21 03:22:16,652 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:16,782 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-21 03:22:16,803 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:16,803 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 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 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:16,808 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:22:16,808 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:22:16,821 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:16,831 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:16,849 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:16,878 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:16,890 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:16,899 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:16,912 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-21 03:22:16,913 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:17,103 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-21 03:22:17,105 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:17,105 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8, 8, 8] total 17 [2018-01-21 03:22:17,105 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:17,106 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 03:22:17,106 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 03:22:17,106 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-01-21 03:22:17,106 INFO L87 Difference]: Start difference. First operand 89 states and 101 transitions. Second operand 11 states. [2018-01-21 03:22:17,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:17,279 INFO L93 Difference]: Finished difference Result 215 states and 249 transitions. [2018-01-21 03:22:17,279 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 03:22:17,279 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 89 [2018-01-21 03:22:17,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:17,281 INFO L225 Difference]: With dead ends: 215 [2018-01-21 03:22:17,282 INFO L226 Difference]: Without dead ends: 186 [2018-01-21 03:22:17,283 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 344 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=276, Unknown=0, NotChecked=0, Total=380 [2018-01-21 03:22:17,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-01-21 03:22:17,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 127. [2018-01-21 03:22:17,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-01-21 03:22:17,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 147 transitions. [2018-01-21 03:22:17,299 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 147 transitions. Word has length 89 [2018-01-21 03:22:17,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:17,300 INFO L432 AbstractCegarLoop]: Abstraction has 127 states and 147 transitions. [2018-01-21 03:22:17,300 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 03:22:17,300 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 147 transitions. [2018-01-21 03:22:17,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2018-01-21 03:22:17,302 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:17,303 INFO L322 BasicCegarLoop]: trace histogram [14, 9, 9, 9, 9, 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] [2018-01-21 03:22:17,303 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:17,303 INFO L82 PathProgramCache]: Analyzing trace with hash 1835683312, now seen corresponding path program 4 times [2018-01-21 03:22:17,303 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:17,304 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:17,304 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:17,304 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:17,304 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:17,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:17,337 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:17,460 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2018-01-21 03:22:17,461 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:17,461 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:17,461 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:17,461 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:17,461 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:17,462 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:17,472 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:22:17,472 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:22:17,503 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:17,506 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:17,750 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 03:22:17,751 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:17,989 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 03:22:18,010 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:18,010 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 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 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:18,013 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:22:18,013 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:22:18,060 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:18,065 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:18,083 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 03:22:18,084 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:18,242 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 03:22:18,243 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:18,244 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 12, 12, 12, 12] total 22 [2018-01-21 03:22:18,244 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:18,244 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 03:22:18,244 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 03:22:18,245 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2018-01-21 03:22:18,245 INFO L87 Difference]: Start difference. First operand 127 states and 147 transitions. Second operand 18 states. [2018-01-21 03:22:18,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:18,838 INFO L93 Difference]: Finished difference Result 335 states and 391 transitions. [2018-01-21 03:22:18,838 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 03:22:18,838 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 120 [2018-01-21 03:22:18,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:18,842 INFO L225 Difference]: With dead ends: 335 [2018-01-21 03:22:18,842 INFO L226 Difference]: Without dead ends: 258 [2018-01-21 03:22:18,844 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 452 SyntacticMatches, 14 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=182, Invalid=748, Unknown=0, NotChecked=0, Total=930 [2018-01-21 03:22:18,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2018-01-21 03:22:18,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 162. [2018-01-21 03:22:18,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-01-21 03:22:18,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 187 transitions. [2018-01-21 03:22:18,866 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 187 transitions. Word has length 120 [2018-01-21 03:22:18,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:18,866 INFO L432 AbstractCegarLoop]: Abstraction has 162 states and 187 transitions. [2018-01-21 03:22:18,866 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 03:22:18,867 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 187 transitions. [2018-01-21 03:22:18,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2018-01-21 03:22:18,869 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:18,869 INFO L322 BasicCegarLoop]: trace histogram [19, 13, 13, 13, 13, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:22:18,869 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:18,869 INFO L82 PathProgramCache]: Analyzing trace with hash 1639693249, now seen corresponding path program 5 times [2018-01-21 03:22:18,869 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:18,870 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:18,870 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:18,871 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:18,871 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:18,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:18,926 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:19,073 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 636 trivial. 0 not checked. [2018-01-21 03:22:19,074 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:19,074 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:19,074 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:19,074 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:19,074 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:19,075 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:19,084 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:22:19,085 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:22:19,101 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:19,105 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:19,109 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:19,112 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:19,116 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:19,121 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:19,122 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:19,125 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:19,208 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 452 proven. 53 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2018-01-21 03:22:19,208 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:19,422 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 122 proven. 235 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2018-01-21 03:22:19,442 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:19,443 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 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 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:19,446 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:22:19,446 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:22:19,461 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:19,468 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:19,479 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:19,492 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:19,515 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:19,551 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:19,578 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:19,584 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:19,607 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 452 proven. 53 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2018-01-21 03:22:19,607 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:19,837 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 122 proven. 235 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2018-01-21 03:22:19,838 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:19,839 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11, 11, 11] total 22 [2018-01-21 03:22:19,839 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:19,839 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 03:22:19,839 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 03:22:19,839 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2018-01-21 03:22:19,840 INFO L87 Difference]: Start difference. First operand 162 states and 187 transitions. Second operand 18 states. [2018-01-21 03:22:20,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:20,313 INFO L93 Difference]: Finished difference Result 376 states and 433 transitions. [2018-01-21 03:22:20,313 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 03:22:20,313 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 151 [2018-01-21 03:22:20,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:20,314 INFO L225 Difference]: With dead ends: 376 [2018-01-21 03:22:20,314 INFO L226 Difference]: Without dead ends: 225 [2018-01-21 03:22:20,315 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 632 GetRequests, 583 SyntacticMatches, 14 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 330 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=242, Invalid=1090, Unknown=0, NotChecked=0, Total=1332 [2018-01-21 03:22:20,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2018-01-21 03:22:20,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 166. [2018-01-21 03:22:20,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-01-21 03:22:20,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 187 transitions. [2018-01-21 03:22:20,328 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 187 transitions. Word has length 151 [2018-01-21 03:22:20,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:20,328 INFO L432 AbstractCegarLoop]: Abstraction has 166 states and 187 transitions. [2018-01-21 03:22:20,328 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 03:22:20,328 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 187 transitions. [2018-01-21 03:22:20,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2018-01-21 03:22:20,331 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:20,331 INFO L322 BasicCegarLoop]: trace histogram [25, 18, 18, 18, 18, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:22:20,331 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:20,331 INFO L82 PathProgramCache]: Analyzing trace with hash -1261295644, now seen corresponding path program 6 times [2018-01-21 03:22:20,331 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:20,332 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:20,332 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:20,332 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:20,333 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:20,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:20,373 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:20,559 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 03:22:20,559 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:20,559 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:20,560 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:20,560 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:20,560 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:20,560 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:20,567 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:22:20,567 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:22:20,580 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:20,582 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:20,587 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:20,591 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:20,595 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:20,600 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:20,605 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:20,610 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:20,616 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:20,617 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:20,620 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:20,642 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 03:22:20,643 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:20,758 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 03:22:20,779 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:20,779 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 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 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:20,783 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:22:20,783 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:22:20,802 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:20,810 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:20,827 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:20,852 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:20,887 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:20,938 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:21,011 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:21,178 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:21,444 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:21,482 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:21,490 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:21,513 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 03:22:21,513 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:21,714 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 03:22:21,718 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:21,718 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 19 [2018-01-21 03:22:21,718 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:21,719 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 03:22:21,719 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 03:22:21,719 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-21 03:22:21,719 INFO L87 Difference]: Start difference. First operand 166 states and 187 transitions. Second operand 11 states. [2018-01-21 03:22:21,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:21,932 INFO L93 Difference]: Finished difference Result 261 states and 295 transitions. [2018-01-21 03:22:21,933 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-21 03:22:21,933 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 187 [2018-01-21 03:22:21,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:21,935 INFO L225 Difference]: With dead ends: 261 [2018-01-21 03:22:21,935 INFO L226 Difference]: Without dead ends: 220 [2018-01-21 03:22:21,936 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 756 GetRequests, 739 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-21 03:22:21,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-01-21 03:22:21,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 175. [2018-01-21 03:22:21,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-01-21 03:22:21,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 198 transitions. [2018-01-21 03:22:21,948 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 198 transitions. Word has length 187 [2018-01-21 03:22:21,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:21,948 INFO L432 AbstractCegarLoop]: Abstraction has 175 states and 198 transitions. [2018-01-21 03:22:21,948 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 03:22:21,949 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 198 transitions. [2018-01-21 03:22:21,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2018-01-21 03:22:21,952 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:21,952 INFO L322 BasicCegarLoop]: trace histogram [30, 22, 22, 22, 22, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:22:21,952 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:21,952 INFO L82 PathProgramCache]: Analyzing trace with hash 2078734259, now seen corresponding path program 7 times [2018-01-21 03:22:21,952 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:21,953 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:21,953 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:21,953 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:21,954 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:21,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:21,986 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:22,236 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 1675 trivial. 0 not checked. [2018-01-21 03:22:22,236 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:22,236 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:22,237 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:22,237 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:22,237 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:22,237 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:22,242 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:22,242 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:22:22,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:22,297 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:22,564 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 1212 proven. 38 refuted. 0 times theorem prover too weak. 581 trivial. 0 not checked. [2018-01-21 03:22:22,564 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:22,832 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 428 proven. 240 refuted. 0 times theorem prover too weak. 1163 trivial. 0 not checked. [2018-01-21 03:22:22,868 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:22,868 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 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 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:22,872 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:22,872 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:22:22,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:22,988 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:23,038 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 1212 proven. 38 refuted. 0 times theorem prover too weak. 581 trivial. 0 not checked. [2018-01-21 03:22:23,038 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:23,255 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 428 proven. 240 refuted. 0 times theorem prover too weak. 1163 trivial. 0 not checked. [2018-01-21 03:22:23,257 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:23,257 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 14, 14, 14] total 28 [2018-01-21 03:22:23,257 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:23,257 INFO L409 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-01-21 03:22:23,258 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-01-21 03:22:23,258 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=611, Unknown=0, NotChecked=0, Total=756 [2018-01-21 03:22:23,258 INFO L87 Difference]: Start difference. First operand 175 states and 198 transitions. Second operand 23 states. [2018-01-21 03:22:23,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:23,728 INFO L93 Difference]: Finished difference Result 454 states and 513 transitions. [2018-01-21 03:22:23,729 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-01-21 03:22:23,729 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 218 [2018-01-21 03:22:23,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:23,732 INFO L225 Difference]: With dead ends: 454 [2018-01-21 03:22:23,732 INFO L226 Difference]: Without dead ends: 360 [2018-01-21 03:22:23,733 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 894 GetRequests, 839 SyntacticMatches, 16 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=306, Invalid=1334, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 03:22:23,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2018-01-21 03:22:23,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 215. [2018-01-21 03:22:23,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2018-01-21 03:22:23,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 244 transitions. [2018-01-21 03:22:23,757 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 244 transitions. Word has length 218 [2018-01-21 03:22:23,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:23,758 INFO L432 AbstractCegarLoop]: Abstraction has 215 states and 244 transitions. [2018-01-21 03:22:23,758 INFO L433 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-01-21 03:22:23,758 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 244 transitions. [2018-01-21 03:22:23,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2018-01-21 03:22:23,760 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:23,761 INFO L322 BasicCegarLoop]: trace histogram [39, 30, 30, 30, 30, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:22:23,761 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:23,761 INFO L82 PathProgramCache]: Analyzing trace with hash -1659522376, now seen corresponding path program 8 times [2018-01-21 03:22:23,761 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:23,762 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:23,762 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:22:23,762 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:23,762 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:23,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:23,802 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:24,076 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 2931 trivial. 0 not checked. [2018-01-21 03:22:24,076 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:24,076 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:24,077 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:24,077 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:24,077 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:24,077 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:24,082 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:22:24,082 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:22:24,103 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:24,140 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:24,146 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:24,151 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:24,435 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 1984 proven. 60 refuted. 0 times theorem prover too weak. 1085 trivial. 0 not checked. [2018-01-21 03:22:24,435 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:24,935 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 680 proven. 360 refuted. 0 times theorem prover too weak. 2089 trivial. 0 not checked. [2018-01-21 03:22:24,958 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:24,958 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 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 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:24,963 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:22:24,963 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:22:24,990 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:25,061 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:25,117 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:25,133 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:25,194 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 1984 proven. 60 refuted. 0 times theorem prover too weak. 1085 trivial. 0 not checked. [2018-01-21 03:22:25,195 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:25,463 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 680 proven. 360 refuted. 0 times theorem prover too weak. 2089 trivial. 0 not checked. [2018-01-21 03:22:25,465 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:25,466 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16, 16, 16, 16] total 32 [2018-01-21 03:22:25,466 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:25,467 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-21 03:22:25,467 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-21 03:22:25,467 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=807, Unknown=0, NotChecked=0, Total=992 [2018-01-21 03:22:25,467 INFO L87 Difference]: Start difference. First operand 215 states and 244 transitions. Second operand 26 states. [2018-01-21 03:22:26,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:26,399 INFO L93 Difference]: Finished difference Result 559 states and 631 transitions. [2018-01-21 03:22:26,399 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-01-21 03:22:26,399 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 269 [2018-01-21 03:22:26,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:26,402 INFO L225 Difference]: With dead ends: 559 [2018-01-21 03:22:26,403 INFO L226 Difference]: Without dead ends: 453 [2018-01-21 03:22:26,404 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1101 GetRequests, 1038 SyntacticMatches, 18 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 734 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=392, Invalid=1770, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 03:22:26,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 453 states. [2018-01-21 03:22:26,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 453 to 260. [2018-01-21 03:22:26,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2018-01-21 03:22:26,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 296 transitions. [2018-01-21 03:22:26,424 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 296 transitions. Word has length 269 [2018-01-21 03:22:26,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:26,425 INFO L432 AbstractCegarLoop]: Abstraction has 260 states and 296 transitions. [2018-01-21 03:22:26,425 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-21 03:22:26,425 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 296 transitions. [2018-01-21 03:22:26,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2018-01-21 03:22:26,427 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:26,428 INFO L322 BasicCegarLoop]: trace histogram [49, 39, 39, 39, 39, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:22:26,428 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:26,428 INFO L82 PathProgramCache]: Analyzing trace with hash 469392129, now seen corresponding path program 9 times [2018-01-21 03:22:26,428 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:26,429 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:26,429 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:26,429 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:26,429 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:26,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:26,469 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:26,774 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 0 proven. 245 refuted. 0 times theorem prover too weak. 4755 trivial. 0 not checked. [2018-01-21 03:22:26,774 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:26,774 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:26,774 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:26,775 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:26,775 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:26,775 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:26,780 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:22:26,780 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:22:26,803 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:26,807 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:26,812 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:26,817 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:26,824 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:26,829 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:26,836 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:26,845 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:26,847 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:26,853 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:27,051 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-21 03:22:27,052 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:27,478 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-21 03:22:27,511 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:27,512 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 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 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:27,517 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:22:27,518 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:22:27,547 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:27,561 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:27,579 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:27,611 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:27,682 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:27,926 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:28,547 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:29,226 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:22:29,266 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:29,274 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:29,350 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-21 03:22:29,350 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:29,640 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-21 03:22:29,643 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:29,643 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12, 12, 12] total 31 [2018-01-21 03:22:29,643 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:29,644 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 03:22:29,644 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 03:22:29,644 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=687, Unknown=0, NotChecked=0, Total=930 [2018-01-21 03:22:29,644 INFO L87 Difference]: Start difference. First operand 260 states and 296 transitions. Second operand 21 states. [2018-01-21 03:22:30,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:30,322 INFO L93 Difference]: Finished difference Result 639 states and 732 transitions. [2018-01-21 03:22:30,322 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-21 03:22:30,322 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 325 [2018-01-21 03:22:30,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:30,336 INFO L225 Difference]: With dead ends: 639 [2018-01-21 03:22:30,336 INFO L226 Difference]: Without dead ends: 586 [2018-01-21 03:22:30,337 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1318 GetRequests, 1280 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=369, Invalid=1037, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 03:22:30,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2018-01-21 03:22:30,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 318. [2018-01-21 03:22:30,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2018-01-21 03:22:30,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 367 transitions. [2018-01-21 03:22:30,363 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 367 transitions. Word has length 325 [2018-01-21 03:22:30,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:30,364 INFO L432 AbstractCegarLoop]: Abstraction has 318 states and 367 transitions. [2018-01-21 03:22:30,364 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 03:22:30,364 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 367 transitions. [2018-01-21 03:22:30,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2018-01-21 03:22:30,367 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:30,367 INFO L322 BasicCegarLoop]: trace histogram [60, 49, 49, 49, 49, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:22:30,367 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:30,368 INFO L82 PathProgramCache]: Analyzing trace with hash -1594188886, now seen corresponding path program 10 times [2018-01-21 03:22:30,368 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:30,369 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:30,369 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:30,369 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:30,369 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:30,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:30,414 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:30,788 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 0 proven. 297 refuted. 0 times theorem prover too weak. 7288 trivial. 0 not checked. [2018-01-21 03:22:30,788 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:30,788 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:30,788 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:30,788 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:30,788 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:30,788 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:30,793 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:22:30,793 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:22:30,890 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:30,897 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:31,289 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 4422 proven. 119 refuted. 0 times theorem prover too weak. 3044 trivial. 0 not checked. [2018-01-21 03:22:31,290 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:31,751 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 1472 proven. 675 refuted. 0 times theorem prover too weak. 5438 trivial. 0 not checked. [2018-01-21 03:22:31,771 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:31,772 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 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 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:31,775 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:22:31,775 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:22:31,918 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:31,928 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:32,012 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 4422 proven. 119 refuted. 0 times theorem prover too weak. 3044 trivial. 0 not checked. [2018-01-21 03:22:32,012 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:32,369 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 1472 proven. 675 refuted. 0 times theorem prover too weak. 5438 trivial. 0 not checked. [2018-01-21 03:22:32,375 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:32,375 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 20, 20, 20, 20] total 40 [2018-01-21 03:22:32,376 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:32,377 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 03:22:32,377 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 03:22:32,377 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=1280, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 03:22:32,378 INFO L87 Difference]: Start difference. First operand 318 states and 367 transitions. Second operand 32 states. [2018-01-21 03:22:33,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:33,993 INFO L93 Difference]: Finished difference Result 837 states and 962 transitions. [2018-01-21 03:22:33,993 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-21 03:22:33,993 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 386 [2018-01-21 03:22:33,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:33,997 INFO L225 Difference]: With dead ends: 837 [2018-01-21 03:22:33,997 INFO L226 Difference]: Without dead ends: 697 [2018-01-21 03:22:33,999 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1575 GetRequests, 1496 SyntacticMatches, 22 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1189 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=597, Invalid=2825, Unknown=0, NotChecked=0, Total=3422 [2018-01-21 03:22:33,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 697 states. [2018-01-21 03:22:34,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 697 to 373. [2018-01-21 03:22:34,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 373 states. [2018-01-21 03:22:34,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 373 states to 373 states and 428 transitions. [2018-01-21 03:22:34,021 INFO L78 Accepts]: Start accepts. Automaton has 373 states and 428 transitions. Word has length 386 [2018-01-21 03:22:34,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:34,021 INFO L432 AbstractCegarLoop]: Abstraction has 373 states and 428 transitions. [2018-01-21 03:22:34,021 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 03:22:34,021 INFO L276 IsEmpty]: Start isEmpty. Operand 373 states and 428 transitions. [2018-01-21 03:22:34,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 448 [2018-01-21 03:22:34,024 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:34,024 INFO L322 BasicCegarLoop]: trace histogram [71, 59, 59, 59, 59, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:22:34,024 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:34,024 INFO L82 PathProgramCache]: Analyzing trace with hash -655925471, now seen corresponding path program 11 times [2018-01-21 03:22:34,024 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:34,025 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:34,025 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:34,025 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:34,025 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:34,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:34,063 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:34,912 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 0 proven. 354 refuted. 0 times theorem prover too weak. 10367 trivial. 0 not checked. [2018-01-21 03:22:34,912 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:34,913 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:34,913 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:34,913 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:34,913 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:34,913 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:34,918 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:22:34,918 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:22:34,947 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:34,965 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:34,976 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:34,984 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:34,993 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:35,002 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:35,012 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:35,022 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:35,024 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:35,031 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:36,113 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 6294 proven. 313 refuted. 0 times theorem prover too weak. 4114 trivial. 0 not checked. [2018-01-21 03:22:36,114 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:37,408 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 1056 proven. 1655 refuted. 0 times theorem prover too weak. 8010 trivial. 0 not checked. [2018-01-21 03:22:37,443 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:37,443 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 26 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 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:37,450 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:22:37,450 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:22:37,485 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:37,502 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:37,538 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:37,618 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:37,746 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:37,958 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:38,195 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:38,527 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:22:38,590 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:38,603 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:38,684 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 6294 proven. 313 refuted. 0 times theorem prover too weak. 4114 trivial. 0 not checked. [2018-01-21 03:22:38,684 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:39,037 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 1056 proven. 1655 refuted. 0 times theorem prover too weak. 8010 trivial. 0 not checked. [2018-01-21 03:22:39,040 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:22:39,040 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19, 19, 19, 19] total 40 [2018-01-21 03:22:39,040 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:22:39,041 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 03:22:39,041 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 03:22:39,042 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=1305, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 03:22:39,042 INFO L87 Difference]: Start difference. First operand 373 states and 428 transitions. Second operand 32 states. [2018-01-21 03:22:40,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:22:40,436 INFO L93 Difference]: Finished difference Result 727 states and 820 transitions. [2018-01-21 03:22:40,437 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-01-21 03:22:40,437 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 447 [2018-01-21 03:22:40,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:22:40,441 INFO L225 Difference]: With dead ends: 727 [2018-01-21 03:22:40,441 INFO L226 Difference]: Without dead ends: 575 [2018-01-21 03:22:40,444 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1842 GetRequests, 1753 SyntacticMatches, 22 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1373 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=773, Invalid=3919, Unknown=0, NotChecked=0, Total=4692 [2018-01-21 03:22:40,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2018-01-21 03:22:40,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 374. [2018-01-21 03:22:40,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 374 states. [2018-01-21 03:22:40,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 429 transitions. [2018-01-21 03:22:40,473 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 429 transitions. Word has length 447 [2018-01-21 03:22:40,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:22:40,474 INFO L432 AbstractCegarLoop]: Abstraction has 374 states and 429 transitions. [2018-01-21 03:22:40,474 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 03:22:40,474 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 429 transitions. [2018-01-21 03:22:40,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 504 [2018-01-21 03:22:40,478 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:22:40,479 INFO L322 BasicCegarLoop]: trace histogram [81, 68, 68, 68, 68, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:22:40,479 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:22:40,479 INFO L82 PathProgramCache]: Analyzing trace with hash 832198916, now seen corresponding path program 12 times [2018-01-21 03:22:40,479 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:22:40,480 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:40,480 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:22:40,480 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:22:40,481 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:22:40,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:22:40,534 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:22:41,644 INFO L134 CoverageAnalysis]: Checked inductivity of 14042 backedges. 0 proven. 416 refuted. 0 times theorem prover too weak. 13626 trivial. 0 not checked. [2018-01-21 03:22:41,644 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:41,644 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:22:41,644 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:22:41,644 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:22:41,644 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:41,645 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:22:41,650 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:22:41,650 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:22:41,681 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:41,687 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:41,691 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:41,698 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:41,703 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:41,710 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:41,716 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:41,725 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:41,735 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:41,745 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:41,755 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:41,765 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:41,779 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:41,793 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:41,807 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:41,831 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:41,834 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:22:41,844 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:22:42,212 INFO L134 CoverageAnalysis]: Checked inductivity of 14042 backedges. 2206 proven. 883 refuted. 0 times theorem prover too weak. 10953 trivial. 0 not checked. [2018-01-21 03:22:42,212 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:22:43,692 INFO L134 CoverageAnalysis]: Checked inductivity of 14042 backedges. 2206 proven. 883 refuted. 0 times theorem prover too weak. 10953 trivial. 0 not checked. [2018-01-21 03:22:43,724 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:22:43,724 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 28 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) [2018-01-21 03:22:43,731 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:22:43,731 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) Waiting until toolchain timeout for monitored process 28 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:22:43,783 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:43,797 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:43,840 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:43,909 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:44,109 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:22:44,605 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... [2018-01-21 03:22:48,176 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Cannot interrupt operation gracefully because timeout expired. Forcing shutdown