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_imprecise.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_true-valid-memsafety.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 00:50:53,375 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 00:50:53,376 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 00:50:53,388 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 00:50:53,388 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 00:50:53,389 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 00:50:53,390 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 00:50:53,392 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 00:50:53,393 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 00:50:53,394 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 00:50:53,395 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 00:50:53,395 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 00:50:53,395 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 00:50:53,396 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 00:50:53,397 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 00:50:53,400 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 00:50:53,402 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 00:50:53,404 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 00:50:53,405 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 00:50:53,406 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 00:50:53,408 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 00:50:53,413 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 00:50:53,414 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 00:50:53,414 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_imprecise.epf [2018-01-21 00:50:53,424 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 00:50:53,424 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 00:50:53,425 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 00:50:53,425 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 00:50:53,425 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 00:50:53,426 INFO L133 SettingsManager]: * Deactivate Weak Equivalences=true [2018-01-21 00:50:53,426 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 00:50:53,426 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 00:50:53,427 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 00:50:53,427 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 00:50:53,427 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 00:50:53,427 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 00:50:53,428 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 00:50:53,428 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 00:50:53,428 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 00:50:53,428 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 00:50:53,428 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 00:50:53,428 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 00:50:53,429 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 00:50:53,429 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 00:50:53,429 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 00:50:53,429 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 00:50:53,430 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 00:50:53,430 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 00:50:53,430 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 00:50:53,430 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 00:50:53,430 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 00:50:53,430 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 00:50:53,431 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 00:50:53,431 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 00:50:53,431 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 00:50:53,431 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 00:50:53,431 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 00:50:53,432 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 00:50:53,432 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 00:50:53,432 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 00:50:53,432 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 00:50:53,433 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 00:50:53,433 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 00:50:53,468 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 00:50:53,481 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 00:50:53,485 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 00:50:53,486 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 00:50:53,487 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 00:50:53,488 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_true-valid-memsafety.c [2018-01-21 00:50:53,610 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 00:50:53,616 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 00:50:53,616 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 00:50:53,617 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 00:50:53,624 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 00:50:53,626 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 12:50:53" (1/1) ... [2018-01-21 00:50:53,628 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2932481 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:50:53, skipping insertion in model container [2018-01-21 00:50:53,628 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 12:50:53" (1/1) ... [2018-01-21 00:50:53,643 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 00:50:53,663 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 00:50:53,781 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 00:50:53,798 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 00:50:53,804 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:50:53 WrapperNode [2018-01-21 00:50:53,804 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 00:50:53,805 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 00:50:53,805 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 00:50:53,805 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 00:50:53,816 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:50:53" (1/1) ... [2018-01-21 00:50:53,816 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:50:53" (1/1) ... [2018-01-21 00:50:53,823 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:50:53" (1/1) ... [2018-01-21 00:50:53,824 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:50:53" (1/1) ... [2018-01-21 00:50:53,827 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:50:53" (1/1) ... [2018-01-21 00:50:53,831 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:50:53" (1/1) ... [2018-01-21 00:50:53,832 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:50:53" (1/1) ... [2018-01-21 00:50:53,834 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 00:50:53,835 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 00:50:53,835 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 00:50:53,835 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 00:50:53,836 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:50:53" (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 00:50:53,879 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 00:50:53,879 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 00:50:53,879 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 00:50:53,879 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 00:50:53,880 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 00:50:53,880 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 00:50:53,880 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 00:50:53,880 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 00:50:53,880 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 00:50:53,880 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 00:50:53,880 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 00:50:53,880 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 00:50:53,880 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 00:50:54,036 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 00:50:54,037 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 12:50:54 BoogieIcfgContainer [2018-01-21 00:50:54,037 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 00:50:54,037 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 00:50:54,037 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 00:50:54,039 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 00:50:54,039 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 12:50:53" (1/3) ... [2018-01-21 00:50:54,040 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e541bd7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 12:50:54, skipping insertion in model container [2018-01-21 00:50:54,040 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:50:53" (2/3) ... [2018-01-21 00:50:54,041 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e541bd7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 12:50:54, skipping insertion in model container [2018-01-21 00:50:54,041 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 12:50:54" (3/3) ... [2018-01-21 00:50:54,043 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength_true-valid-memsafety.c [2018-01-21 00:50:54,052 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 00:50:54,059 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 00:50:54,102 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:50:54,103 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:50:54,103 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:50:54,103 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:50:54,103 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:50:54,103 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:50:54,103 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:50:54,104 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 00:50:54,105 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:50:54,125 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 00:50:54,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 00:50:54,131 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:54,132 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 00:50:54,133 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 00:50:54,138 INFO L82 PathProgramCache]: Analyzing trace with hash 103790, now seen corresponding path program 1 times [2018-01-21 00:50:54,141 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:54,194 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:54,194 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:50:54,194 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:54,195 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:54,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 00:50:54,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 00:50:54,246 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 00:50:54,252 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 00:50:54,258 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:50:54,258 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:50:54,258 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:50:54,258 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:50:54,259 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:50:54,259 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:50:54,259 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:50:54,259 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 00:50:54,259 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:50:54,261 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 00:50:54,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 00:50:54,263 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:54,263 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:50:54,263 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 00:50:54,263 INFO L82 PathProgramCache]: Analyzing trace with hash -125735921, now seen corresponding path program 1 times [2018-01-21 00:50:54,263 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:54,264 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:54,265 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:50:54,265 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:54,265 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:54,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:54,291 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:54,322 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 00:50:54,324 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:50:54,324 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 00:50:54,325 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:50:54,326 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 00:50:54,336 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 00:50:54,337 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 00:50:54,339 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-01-21 00:50:54,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:54,373 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-01-21 00:50:54,373 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 00:50:54,375 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 00:50:54,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:54,382 INFO L225 Difference]: With dead ends: 78 [2018-01-21 00:50:54,383 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 00:50:54,386 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 00:50:54,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 00:50:54,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 00:50:54,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 00:50:54,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 00:50:54,477 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 00:50:54,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:54,478 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 00:50:54,478 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 00:50:54,478 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 00:50:54,478 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 00:50:54,481 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:50:54,481 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:50:54,481 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:50:54,481 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:50:54,481 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:50:54,481 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:50:54,481 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:50:54,481 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 00:50:54,481 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:50:54,483 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 00:50:54,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 00:50:54,485 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:54,485 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 00:50:54,485 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:54,486 INFO L82 PathProgramCache]: Analyzing trace with hash -1491711838, now seen corresponding path program 1 times [2018-01-21 00:50:54,486 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:54,487 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:54,487 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:50:54,487 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:54,487 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:54,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:54,497 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:54,511 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 00:50:54,512 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:50:54,512 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 00:50:54,512 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:50:54,512 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 00:50:54,513 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 00:50:54,513 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 00:50:54,513 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-01-21 00:50:54,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:54,519 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-01-21 00:50:54,519 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 00:50:54,519 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 00:50:54,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:54,522 INFO L225 Difference]: With dead ends: 78 [2018-01-21 00:50:54,522 INFO L226 Difference]: Without dead ends: 40 [2018-01-21 00:50:54,523 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 00:50:54,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-01-21 00:50:54,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-01-21 00:50:54,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-01-21 00:50:54,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2018-01-21 00:50:54,535 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 17 [2018-01-21 00:50:54,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:54,535 INFO L432 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2018-01-21 00:50:54,535 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 00:50:54,535 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2018-01-21 00:50:54,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 00:50:54,536 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:54,536 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 00:50:54,536 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:54,536 INFO L82 PathProgramCache]: Analyzing trace with hash -1603848178, now seen corresponding path program 1 times [2018-01-21 00:50:54,536 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:54,537 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:54,537 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:50:54,537 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:54,537 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:54,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:54,550 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:54,588 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 00:50:54,588 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:50:54,589 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 00:50:54,589 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:50:54,590 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 00:50:54,591 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 00:50:54,591 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 00:50:54,591 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 3 states. [2018-01-21 00:50:54,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:54,643 INFO L93 Difference]: Finished difference Result 73 states and 81 transitions. [2018-01-21 00:50:54,643 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 00:50:54,643 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 00:50:54,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:54,646 INFO L225 Difference]: With dead ends: 73 [2018-01-21 00:50:54,647 INFO L226 Difference]: Without dead ends: 57 [2018-01-21 00:50:54,647 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 00:50:54,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-01-21 00:50:54,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 44. [2018-01-21 00:50:54,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-21 00:50:54,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2018-01-21 00:50:54,660 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 19 [2018-01-21 00:50:54,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:54,661 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2018-01-21 00:50:54,661 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 00:50:54,661 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2018-01-21 00:50:54,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 00:50:54,662 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:54,662 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, 1, 1, 1] [2018-01-21 00:50:54,663 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:54,663 INFO L82 PathProgramCache]: Analyzing trace with hash -428436962, now seen corresponding path program 1 times [2018-01-21 00:50:54,663 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:54,664 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:54,664 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:50:54,664 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:54,664 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:54,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:54,685 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:54,763 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 00:50:54,763 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:54,763 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:50:54,764 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 35 with the following transitions: [2018-01-21 00:50:54,766 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [75], [77], [78], [79], [80], [81], [82] [2018-01-21 00:50:54,810 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 00:50:54,810 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 00:50:55,024 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 00:50:55,025 INFO L268 AbstractInterpreter]: Visited 33 different actions 57 times. Merged at 17 different actions 17 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 21 variables. [2018-01-21 00:50:55,039 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 00:50:55,039 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:55,039 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 00:50:55,055 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:50:55,055 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:50:55,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:55,082 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:55,106 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 00:50:55,107 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:55,159 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 00:50:55,179 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:55,179 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 00:50:55,183 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:50:55,183 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:50:55,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:55,210 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:55,217 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 00:50:55,217 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:55,266 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 00:50:55,267 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:50:55,267 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 00:50:55,267 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:50:55,268 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 00:50:55,268 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 00:50:55,268 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 00:50:55,269 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand 5 states. [2018-01-21 00:50:55,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:55,342 INFO L93 Difference]: Finished difference Result 92 states and 102 transitions. [2018-01-21 00:50:55,342 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 00:50:55,342 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 34 [2018-01-21 00:50:55,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:55,344 INFO L225 Difference]: With dead ends: 92 [2018-01-21 00:50:55,344 INFO L226 Difference]: Without dead ends: 74 [2018-01-21 00:50:55,345 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 00:50:55,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-01-21 00:50:55,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 56. [2018-01-21 00:50:55,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-01-21 00:50:55,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 61 transitions. [2018-01-21 00:50:55,352 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 61 transitions. Word has length 34 [2018-01-21 00:50:55,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:55,352 INFO L432 AbstractCegarLoop]: Abstraction has 56 states and 61 transitions. [2018-01-21 00:50:55,353 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 00:50:55,353 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 61 transitions. [2018-01-21 00:50:55,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-21 00:50:55,355 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:55,355 INFO L322 BasicCegarLoop]: trace histogram [3, 2, 2, 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, 1] [2018-01-21 00:50:55,355 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:55,356 INFO L82 PathProgramCache]: Analyzing trace with hash 284082524, now seen corresponding path program 2 times [2018-01-21 00:50:55,356 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:55,357 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:55,357 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:50:55,357 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:55,357 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:55,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:55,373 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:55,467 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-21 00:50:55,467 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:55,468 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:50:55,468 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:50:55,468 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:50:55,468 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:55,468 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:50:55,479 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:50:55,480 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:50:55,496 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:55,506 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:55,508 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:55,511 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:55,594 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-21 00:50:55,594 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:55,744 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-21 00:50:55,774 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 00:50:55,775 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5] total 10 [2018-01-21 00:50:55,775 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:50:55,775 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 00:50:55,775 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 00:50:55,775 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2018-01-21 00:50:55,776 INFO L87 Difference]: Start difference. First operand 56 states and 61 transitions. Second operand 6 states. [2018-01-21 00:50:55,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:55,906 INFO L93 Difference]: Finished difference Result 108 states and 119 transitions. [2018-01-21 00:50:55,907 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 00:50:55,907 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 47 [2018-01-21 00:50:55,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:55,908 INFO L225 Difference]: With dead ends: 108 [2018-01-21 00:50:55,909 INFO L226 Difference]: Without dead ends: 69 [2018-01-21 00:50:55,909 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 86 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 00:50:55,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-01-21 00:50:55,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 61. [2018-01-21 00:50:55,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-01-21 00:50:55,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2018-01-21 00:50:55,917 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 47 [2018-01-21 00:50:55,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:55,917 INFO L432 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2018-01-21 00:50:55,917 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 00:50:55,918 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2018-01-21 00:50:55,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-21 00:50:55,919 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:55,920 INFO L322 BasicCegarLoop]: trace histogram [3, 3, 2, 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, 1, 1, 1, 1, 1] [2018-01-21 00:50:55,920 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:55,920 INFO L82 PathProgramCache]: Analyzing trace with hash -1139762048, now seen corresponding path program 1 times [2018-01-21 00:50:55,920 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:55,921 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:55,921 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:50:55,921 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:55,922 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:55,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:55,942 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:56,013 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 00:50:56,014 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:56,014 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:50:56,014 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 53 with the following transitions: [2018-01-21 00:50:56,014 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [75], [77], [78], [79], [80], [81], [82] [2018-01-21 00:50:56,016 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 00:50:56,016 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 00:50:56,202 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 00:50:56,203 INFO L268 AbstractInterpreter]: Visited 37 different actions 91 times. Merged at 25 different actions 41 times. Never widened. Found 6 fixpoints after 3 different actions. Largest state had 23 variables. [2018-01-21 00:50:56,205 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 00:50:56,205 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:56,205 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 00:50:56,215 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:50:56,215 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:50:56,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:56,241 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:56,258 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 00:50:56,258 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:56,326 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 00:50:56,345 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:56,346 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 00:50:56,349 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:50:56,349 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:50:56,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:56,388 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:56,394 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 00:50:56,394 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:56,416 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 00:50:56,417 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:50:56,417 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 9 [2018-01-21 00:50:56,417 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:50:56,418 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 00:50:56,418 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 00:50:56,418 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 00:50:56,418 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand 6 states. [2018-01-21 00:50:56,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:56,493 INFO L93 Difference]: Finished difference Result 119 states and 133 transitions. [2018-01-21 00:50:56,493 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 00:50:56,493 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 52 [2018-01-21 00:50:56,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:56,495 INFO L225 Difference]: With dead ends: 119 [2018-01-21 00:50:56,495 INFO L226 Difference]: Without dead ends: 96 [2018-01-21 00:50:56,495 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 204 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 00:50:56,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-01-21 00:50:56,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 73. [2018-01-21 00:50:56,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-01-21 00:50:56,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 81 transitions. [2018-01-21 00:50:56,506 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 81 transitions. Word has length 52 [2018-01-21 00:50:56,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:56,507 INFO L432 AbstractCegarLoop]: Abstraction has 73 states and 81 transitions. [2018-01-21 00:50:56,507 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 00:50:56,507 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 81 transitions. [2018-01-21 00:50:56,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-01-21 00:50:56,509 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:56,509 INFO L322 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 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, 1] [2018-01-21 00:50:56,509 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:56,510 INFO L82 PathProgramCache]: Analyzing trace with hash -2110418334, now seen corresponding path program 2 times [2018-01-21 00:50:56,510 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:56,511 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:56,511 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:50:56,511 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:56,511 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:56,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:56,536 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:56,615 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 00:50:56,616 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:56,616 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:50:56,616 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:50:56,616 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:50:56,616 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:56,616 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 00:50:56,627 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:50:56,628 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:50:56,641 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:56,653 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:56,655 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:56,659 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:56,730 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 48 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-21 00:50:56,730 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:56,895 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 48 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-21 00:50:56,925 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:56,925 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 00:50:56,928 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:50:56,928 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:50:56,940 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:56,959 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:56,981 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:56,988 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:57,011 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 00:50:57,011 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:57,066 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 00:50:57,068 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:50:57,068 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8, 6, 6] total 19 [2018-01-21 00:50:57,068 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:50:57,068 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-21 00:50:57,069 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-21 00:50:57,069 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2018-01-21 00:50:57,069 INFO L87 Difference]: Start difference. First operand 73 states and 81 transitions. Second operand 12 states. [2018-01-21 00:50:57,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:57,305 INFO L93 Difference]: Finished difference Result 192 states and 218 transitions. [2018-01-21 00:50:57,305 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 00:50:57,306 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 70 [2018-01-21 00:50:57,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:57,308 INFO L225 Difference]: With dead ends: 192 [2018-01-21 00:50:57,308 INFO L226 Difference]: Without dead ends: 143 [2018-01-21 00:50:57,309 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 262 SyntacticMatches, 5 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=129, Invalid=423, Unknown=0, NotChecked=0, Total=552 [2018-01-21 00:50:57,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2018-01-21 00:50:57,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 101. [2018-01-21 00:50:57,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-01-21 00:50:57,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 113 transitions. [2018-01-21 00:50:57,319 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 113 transitions. Word has length 70 [2018-01-21 00:50:57,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:57,319 INFO L432 AbstractCegarLoop]: Abstraction has 101 states and 113 transitions. [2018-01-21 00:50:57,319 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-21 00:50:57,319 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 113 transitions. [2018-01-21 00:50:57,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-01-21 00:50:57,321 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:57,321 INFO L322 BasicCegarLoop]: trace histogram [9, 5, 5, 5, 5, 5, 4, 4, 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, 1] [2018-01-21 00:50:57,321 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:57,321 INFO L82 PathProgramCache]: Analyzing trace with hash 1934895936, now seen corresponding path program 3 times [2018-01-21 00:50:57,321 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:57,322 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:57,322 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:50:57,322 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:57,322 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:57,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:57,351 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:57,480 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-01-21 00:50:57,480 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:57,480 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:50:57,480 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:50:57,481 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:50:57,481 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:57,481 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 00:50:57,488 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:50:57,489 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:50:57,506 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:57,512 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:57,519 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:57,536 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:57,539 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:57,543 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:57,652 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 83 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-01-21 00:50:57,653 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:57,825 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 83 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-01-21 00:50:57,854 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:57,854 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 00:50:57,857 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:50:57,857 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:50:57,870 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:57,879 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:57,894 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:57,916 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:50:57,929 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:57,935 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:57,946 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 83 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-01-21 00:50:57,946 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:58,030 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 83 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-01-21 00:50:58,032 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:50:58,032 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8, 8, 8] total 17 [2018-01-21 00:50:58,033 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:50:58,033 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 00:50:58,033 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 00:50:58,034 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-01-21 00:50:58,034 INFO L87 Difference]: Start difference. First operand 101 states and 113 transitions. Second operand 11 states. [2018-01-21 00:50:58,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:58,289 INFO L93 Difference]: Finished difference Result 239 states and 273 transitions. [2018-01-21 00:50:58,289 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 00:50:58,290 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 98 [2018-01-21 00:50:58,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:58,291 INFO L225 Difference]: With dead ends: 239 [2018-01-21 00:50:58,291 INFO L226 Difference]: Without dead ends: 206 [2018-01-21 00:50:58,292 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 380 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=104, Invalid=276, Unknown=0, NotChecked=0, Total=380 [2018-01-21 00:50:58,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2018-01-21 00:50:58,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 142. [2018-01-21 00:50:58,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-01-21 00:50:58,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 162 transitions. [2018-01-21 00:50:58,303 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 162 transitions. Word has length 98 [2018-01-21 00:50:58,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:58,304 INFO L432 AbstractCegarLoop]: Abstraction has 142 states and 162 transitions. [2018-01-21 00:50:58,304 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 00:50:58,304 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 162 transitions. [2018-01-21 00:50:58,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-01-21 00:50:58,305 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:58,305 INFO L322 BasicCegarLoop]: trace histogram [14, 9, 9, 9, 9, 6, 5, 5, 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, 1] [2018-01-21 00:50:58,305 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:58,306 INFO L82 PathProgramCache]: Analyzing trace with hash -883540994, now seen corresponding path program 4 times [2018-01-21 00:50:58,306 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:58,306 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:58,306 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:50:58,306 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:58,306 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:58,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:58,335 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:58,443 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2018-01-21 00:50:58,443 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:58,443 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:50:58,443 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:50:58,444 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:50:58,444 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:58,444 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 00:50:58,449 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:50:58,450 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:50:58,481 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:58,484 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:58,604 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 226 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 00:50:58,604 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:58,809 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 226 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 00:50:58,831 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:58,831 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 00:50:58,834 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:50:58,834 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:50:58,885 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:58,890 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:58,923 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 226 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 00:50:58,923 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:50:59,044 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 226 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 00:50:59,045 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:50:59,046 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 12, 12, 12, 12] total 22 [2018-01-21 00:50:59,046 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:50:59,046 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 00:50:59,046 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 00:50:59,046 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2018-01-21 00:50:59,047 INFO L87 Difference]: Start difference. First operand 142 states and 162 transitions. Second operand 18 states. [2018-01-21 00:50:59,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:50:59,473 INFO L93 Difference]: Finished difference Result 371 states and 427 transitions. [2018-01-21 00:50:59,473 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 00:50:59,473 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 131 [2018-01-21 00:50:59,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:50:59,475 INFO L225 Difference]: With dead ends: 371 [2018-01-21 00:50:59,475 INFO L226 Difference]: Without dead ends: 283 [2018-01-21 00:50:59,477 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 539 GetRequests, 496 SyntacticMatches, 14 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=182, Invalid=748, Unknown=0, NotChecked=0, Total=930 [2018-01-21 00:50:59,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2018-01-21 00:50:59,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 180. [2018-01-21 00:50:59,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-01-21 00:50:59,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 205 transitions. [2018-01-21 00:50:59,492 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 205 transitions. Word has length 131 [2018-01-21 00:50:59,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:50:59,492 INFO L432 AbstractCegarLoop]: Abstraction has 180 states and 205 transitions. [2018-01-21 00:50:59,492 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 00:50:59,492 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 205 transitions. [2018-01-21 00:50:59,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-01-21 00:50:59,494 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:50:59,494 INFO L322 BasicCegarLoop]: trace histogram [19, 13, 13, 13, 13, 7, 6, 6, 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, 1] [2018-01-21 00:50:59,494 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:50:59,494 INFO L82 PathProgramCache]: Analyzing trace with hash 1207261824, now seen corresponding path program 5 times [2018-01-21 00:50:59,494 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:50:59,495 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:59,495 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:50:59,495 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:50:59,495 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:50:59,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:50:59,525 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:50:59,698 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 636 trivial. 0 not checked. [2018-01-21 00:50:59,699 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:59,699 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:50:59,699 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:50:59,699 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:50:59,699 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:50:59,699 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 00:50:59,705 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:50:59,705 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:50:59,716 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:59,719 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:59,723 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:59,728 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:59,734 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:59,740 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:50:59,742 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:50:59,745 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:50:59,873 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 476 proven. 53 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2018-01-21 00:50:59,873 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:51:00,100 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 146 proven. 235 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2018-01-21 00:51:00,123 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:51:00,123 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 00:51:00,126 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:51:00,127 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:51:00,142 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:00,148 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:00,159 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:00,175 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:00,199 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:00,594 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:00,623 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:51:00,629 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:51:00,648 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 476 proven. 53 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2018-01-21 00:51:00,648 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:51:00,852 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 146 proven. 235 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2018-01-21 00:51:00,854 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:51:00,854 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11, 11, 11] total 22 [2018-01-21 00:51:00,854 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:51:00,855 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 00:51:00,855 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 00:51:00,855 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2018-01-21 00:51:00,855 INFO L87 Difference]: Start difference. First operand 180 states and 205 transitions. Second operand 18 states. [2018-01-21 00:51:01,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:51:01,317 INFO L93 Difference]: Finished difference Result 418 states and 475 transitions. [2018-01-21 00:51:01,318 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 00:51:01,318 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 164 [2018-01-21 00:51:01,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:51:01,320 INFO L225 Difference]: With dead ends: 418 [2018-01-21 00:51:01,320 INFO L226 Difference]: Without dead ends: 249 [2018-01-21 00:51:01,321 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 684 GetRequests, 635 SyntacticMatches, 14 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=242, Invalid=1090, Unknown=0, NotChecked=0, Total=1332 [2018-01-21 00:51:01,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2018-01-21 00:51:01,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 187. [2018-01-21 00:51:01,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-01-21 00:51:01,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 208 transitions. [2018-01-21 00:51:01,335 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 208 transitions. Word has length 164 [2018-01-21 00:51:01,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:51:01,335 INFO L432 AbstractCegarLoop]: Abstraction has 187 states and 208 transitions. [2018-01-21 00:51:01,335 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 00:51:01,336 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 208 transitions. [2018-01-21 00:51:01,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2018-01-21 00:51:01,339 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:51:01,339 INFO L322 BasicCegarLoop]: trace histogram [25, 18, 18, 18, 18, 8, 7, 7, 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, 1] [2018-01-21 00:51:01,339 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:51:01,339 INFO L82 PathProgramCache]: Analyzing trace with hash -1562233122, now seen corresponding path program 6 times [2018-01-21 00:51:01,339 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:51:01,340 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:51:01,340 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:51:01,340 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:51:01,341 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:51:01,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:51:01,374 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:51:01,555 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 00:51:01,555 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:51:01,555 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:51:01,555 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:51:01,556 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:51:01,556 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:51:01,556 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 00:51:01,561 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:51:01,561 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:51:01,575 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:51:01,578 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:51:01,580 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:51:01,584 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:51:01,588 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:51:01,593 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:51:01,599 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:51:01,605 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:51:01,616 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:51:01,617 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:51:01,620 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:51:01,645 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 00:51:01,645 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:51:01,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 00:51:01,803 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:51:01,803 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 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 00:51:01,806 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:51:01,807 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:51:01,825 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:51:01,832 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:51:01,845 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:51:01,865 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:51:01,917 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:51:02,077 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:51:03,470 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:51:03,886 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:51:15,917 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:51:15,974 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:51:15,996 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:51:16,023 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 00:51:16,023 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:51:16,086 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 00:51:16,089 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:51:16,089 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 19 [2018-01-21 00:51:16,089 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:51:16,090 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 00:51:16,090 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 00:51:16,090 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-21 00:51:16,090 INFO L87 Difference]: Start difference. First operand 187 states and 208 transitions. Second operand 11 states. [2018-01-21 00:51:16,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:51:16,218 INFO L93 Difference]: Finished difference Result 295 states and 329 transitions. [2018-01-21 00:51:16,218 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-21 00:51:16,219 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 202 [2018-01-21 00:51:16,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:51:16,220 INFO L225 Difference]: With dead ends: 295 [2018-01-21 00:51:16,220 INFO L226 Difference]: Without dead ends: 247 [2018-01-21 00:51:16,221 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 816 GetRequests, 799 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 00:51:16,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-01-21 00:51:16,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 199. [2018-01-21 00:51:16,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2018-01-21 00:51:16,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 222 transitions. [2018-01-21 00:51:16,231 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 222 transitions. Word has length 202 [2018-01-21 00:51:16,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:51:16,232 INFO L432 AbstractCegarLoop]: Abstraction has 199 states and 222 transitions. [2018-01-21 00:51:16,232 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 00:51:16,232 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 222 transitions. [2018-01-21 00:51:16,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2018-01-21 00:51:16,235 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:51:16,235 INFO L322 BasicCegarLoop]: trace histogram [30, 22, 22, 22, 22, 9, 8, 8, 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, 1] [2018-01-21 00:51:16,235 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:51:16,235 INFO L82 PathProgramCache]: Analyzing trace with hash 1505706396, now seen corresponding path program 7 times [2018-01-21 00:51:16,235 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:51:16,236 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:51:16,236 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:51:16,236 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:51:16,237 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:51:16,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:51:16,271 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:51:16,543 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 1675 trivial. 0 not checked. [2018-01-21 00:51:16,543 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:51:16,543 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:51:16,543 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:51:16,543 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:51:16,543 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:51:16,543 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 00:51:16,550 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:51:16,550 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:51:16,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:51:16,606 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:51:16,905 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 1262 proven. 38 refuted. 0 times theorem prover too weak. 587 trivial. 0 not checked. [2018-01-21 00:51:16,905 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:51:17,142 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 478 proven. 240 refuted. 0 times theorem prover too weak. 1169 trivial. 0 not checked. [2018-01-21 00:51:17,163 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:51:17,163 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 00:51:17,166 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:51:17,166 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:51:17,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:51:17,270 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:51:17,315 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 1262 proven. 38 refuted. 0 times theorem prover too weak. 587 trivial. 0 not checked. [2018-01-21 00:51:17,316 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:51:17,491 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 478 proven. 240 refuted. 0 times theorem prover too weak. 1169 trivial. 0 not checked. [2018-01-21 00:51:17,493 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:51:17,493 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 14, 14, 14] total 28 [2018-01-21 00:51:17,493 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:51:17,494 INFO L409 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-01-21 00:51:17,494 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-01-21 00:51:17,494 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=611, Unknown=0, NotChecked=0, Total=756 [2018-01-21 00:51:17,495 INFO L87 Difference]: Start difference. First operand 199 states and 222 transitions. Second operand 23 states. [2018-01-21 00:51:17,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:51:17,916 INFO L93 Difference]: Finished difference Result 498 states and 557 transitions. [2018-01-21 00:51:17,916 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-01-21 00:51:17,916 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 235 [2018-01-21 00:51:17,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:51:17,919 INFO L225 Difference]: With dead ends: 498 [2018-01-21 00:51:17,919 INFO L226 Difference]: Without dead ends: 390 [2018-01-21 00:51:17,920 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 962 GetRequests, 907 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 00:51:17,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2018-01-21 00:51:17,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 242. [2018-01-21 00:51:17,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2018-01-21 00:51:17,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 271 transitions. [2018-01-21 00:51:17,939 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 271 transitions. Word has length 235 [2018-01-21 00:51:17,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:51:17,939 INFO L432 AbstractCegarLoop]: Abstraction has 242 states and 271 transitions. [2018-01-21 00:51:17,939 INFO L433 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-01-21 00:51:17,939 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 271 transitions. [2018-01-21 00:51:17,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2018-01-21 00:51:17,941 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:51:17,942 INFO L322 BasicCegarLoop]: trace histogram [39, 30, 30, 30, 30, 10, 9, 9, 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, 1] [2018-01-21 00:51:17,942 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:51:17,942 INFO L82 PathProgramCache]: Analyzing trace with hash 369611686, now seen corresponding path program 8 times [2018-01-21 00:51:17,942 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:51:17,943 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:51:17,943 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:51:17,943 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:51:17,943 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:51:17,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:51:17,981 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:51:18,224 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 2931 trivial. 0 not checked. [2018-01-21 00:51:18,225 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:51:18,225 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:51:18,225 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:51:18,225 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:51:18,225 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:51:18,225 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 00:51:18,230 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:51:18,231 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:51:18,250 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:18,280 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:18,286 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:51:18,292 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:51:18,539 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 2050 proven. 60 refuted. 0 times theorem prover too weak. 1091 trivial. 0 not checked. [2018-01-21 00:51:18,539 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:51:18,944 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 746 proven. 360 refuted. 0 times theorem prover too weak. 2095 trivial. 0 not checked. [2018-01-21 00:51:18,966 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:51:18,966 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 00:51:18,971 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:51:18,972 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:51:18,999 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:19,056 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:19,101 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:51:19,112 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:51:19,184 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 2050 proven. 60 refuted. 0 times theorem prover too weak. 1091 trivial. 0 not checked. [2018-01-21 00:51:19,184 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:51:19,419 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 746 proven. 360 refuted. 0 times theorem prover too weak. 2095 trivial. 0 not checked. [2018-01-21 00:51:19,421 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:51:19,421 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16, 16, 16, 16] total 32 [2018-01-21 00:51:19,421 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:51:19,422 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-21 00:51:19,422 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-21 00:51:19,422 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=807, Unknown=0, NotChecked=0, Total=992 [2018-01-21 00:51:19,423 INFO L87 Difference]: Start difference. First operand 242 states and 271 transitions. Second operand 26 states. [2018-01-21 00:51:20,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:51:20,013 INFO L93 Difference]: Finished difference Result 607 states and 679 transitions. [2018-01-21 00:51:20,013 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-01-21 00:51:20,013 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 288 [2018-01-21 00:51:20,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:51:20,018 INFO L225 Difference]: With dead ends: 607 [2018-01-21 00:51:20,018 INFO L226 Difference]: Without dead ends: 486 [2018-01-21 00:51:20,020 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1177 GetRequests, 1114 SyntacticMatches, 18 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 734 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=392, Invalid=1770, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 00:51:20,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 486 states. [2018-01-21 00:51:20,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 486 to 290. [2018-01-21 00:51:20,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 290 states. [2018-01-21 00:51:20,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 326 transitions. [2018-01-21 00:51:20,043 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 326 transitions. Word has length 288 [2018-01-21 00:51:20,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:51:20,044 INFO L432 AbstractCegarLoop]: Abstraction has 290 states and 326 transitions. [2018-01-21 00:51:20,044 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-21 00:51:20,044 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 326 transitions. [2018-01-21 00:51:20,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2018-01-21 00:51:20,047 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:51:20,047 INFO L322 BasicCegarLoop]: trace histogram [49, 39, 39, 39, 39, 11, 10, 10, 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, 1] [2018-01-21 00:51:20,047 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:51:20,047 INFO L82 PathProgramCache]: Analyzing trace with hash -292281344, now seen corresponding path program 9 times [2018-01-21 00:51:20,047 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:51:20,048 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:51:20,049 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:51:20,049 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:51:20,049 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:51:20,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:51:20,096 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:51:20,417 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 0 proven. 335 refuted. 0 times theorem prover too weak. 4755 trivial. 0 not checked. [2018-01-21 00:51:20,417 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:51:20,417 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:51:20,417 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:51:20,417 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:51:20,417 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:51:20,417 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 00:51:20,425 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:51:20,425 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:51:20,453 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:51:20,458 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:51:20,464 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:51:20,471 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:51:20,481 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:51:20,491 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:51:20,502 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:51:20,514 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:51:20,516 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:51:20,522 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:51:20,752 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 1265 proven. 87 refuted. 0 times theorem prover too weak. 3738 trivial. 0 not checked. [2018-01-21 00:51:20,752 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:51:21,216 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 1265 proven. 87 refuted. 0 times theorem prover too weak. 3738 trivial. 0 not checked. [2018-01-21 00:51:21,236 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:51:21,236 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 00:51:21,239 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:51:21,239 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:51:21,266 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:51:21,274 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:51:21,288 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:51:21,308 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:51:21,342 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:51:21,407 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:51:21,703 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:51:22,540 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:51:22,581 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:51:22,589 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:51:22,639 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 1265 proven. 87 refuted. 0 times theorem prover too weak. 3738 trivial. 0 not checked. [2018-01-21 00:51:22,639 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:51:22,822 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 1265 proven. 87 refuted. 0 times theorem prover too weak. 3738 trivial. 0 not checked. [2018-01-21 00:51:22,824 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:51:22,824 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12, 12, 12] total 31 [2018-01-21 00:51:22,824 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:51:22,825 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 00:51:22,826 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 00:51:22,826 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=687, Unknown=0, NotChecked=0, Total=930 [2018-01-21 00:51:22,826 INFO L87 Difference]: Start difference. First operand 290 states and 326 transitions. Second operand 21 states. [2018-01-21 00:51:23,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:51:23,309 INFO L93 Difference]: Finished difference Result 697 states and 790 transitions. [2018-01-21 00:51:23,310 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-21 00:51:23,310 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 346 [2018-01-21 00:51:23,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:51:23,314 INFO L225 Difference]: With dead ends: 697 [2018-01-21 00:51:23,315 INFO L226 Difference]: Without dead ends: 634 [2018-01-21 00:51:23,316 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1402 GetRequests, 1364 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=369, Invalid=1037, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 00:51:23,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 634 states. [2018-01-21 00:51:23,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 634 to 351. [2018-01-21 00:51:23,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 351 states. [2018-01-21 00:51:23,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 400 transitions. [2018-01-21 00:51:23,341 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 400 transitions. Word has length 346 [2018-01-21 00:51:23,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:51:23,342 INFO L432 AbstractCegarLoop]: Abstraction has 351 states and 400 transitions. [2018-01-21 00:51:23,342 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 00:51:23,343 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 400 transitions. [2018-01-21 00:51:23,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2018-01-21 00:51:23,346 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:51:23,346 INFO L322 BasicCegarLoop]: trace histogram [60, 49, 49, 49, 49, 12, 11, 11, 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, 1] [2018-01-21 00:51:23,346 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:51:23,346 INFO L82 PathProgramCache]: Analyzing trace with hash 1529949378, now seen corresponding path program 10 times [2018-01-21 00:51:23,346 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:51:23,347 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:51:23,347 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:51:23,347 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:51:23,348 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:51:23,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:51:23,395 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:51:23,865 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 0 proven. 407 refuted. 0 times theorem prover too weak. 7288 trivial. 0 not checked. [2018-01-21 00:51:23,865 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:51:23,866 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:51:23,866 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:51:23,866 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:51:23,866 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:51:23,866 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 00:51:23,874 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:51:23,874 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:51:23,978 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:51:23,985 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:51:24,295 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 4526 proven. 119 refuted. 0 times theorem prover too weak. 3050 trivial. 0 not checked. [2018-01-21 00:51:24,296 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:51:24,696 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 1576 proven. 675 refuted. 0 times theorem prover too weak. 5444 trivial. 0 not checked. [2018-01-21 00:51:24,715 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:51:24,716 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 00:51:24,718 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:51:24,718 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:51:24,940 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:51:24,952 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:51:25,047 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 4526 proven. 119 refuted. 0 times theorem prover too weak. 3050 trivial. 0 not checked. [2018-01-21 00:51:25,047 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:51:25,344 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 1576 proven. 675 refuted. 0 times theorem prover too weak. 5444 trivial. 0 not checked. [2018-01-21 00:51:25,346 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:51:25,346 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 20, 20, 20, 20] total 40 [2018-01-21 00:51:25,346 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:51:25,347 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 00:51:25,347 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 00:51:25,348 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=1280, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 00:51:25,348 INFO L87 Difference]: Start difference. First operand 351 states and 400 transitions. Second operand 32 states. [2018-01-21 00:51:26,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:51:26,074 INFO L93 Difference]: Finished difference Result 905 states and 1030 transitions. [2018-01-21 00:51:26,075 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-21 00:51:26,075 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 409 [2018-01-21 00:51:26,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:51:26,078 INFO L225 Difference]: With dead ends: 905 [2018-01-21 00:51:26,078 INFO L226 Difference]: Without dead ends: 744 [2018-01-21 00:51:26,080 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1667 GetRequests, 1588 SyntacticMatches, 22 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1189 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=597, Invalid=2825, Unknown=0, NotChecked=0, Total=3422 [2018-01-21 00:51:26,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 744 states. [2018-01-21 00:51:26,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 744 to 409. [2018-01-21 00:51:26,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 409 states. [2018-01-21 00:51:26,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 464 transitions. [2018-01-21 00:51:26,102 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 464 transitions. Word has length 409 [2018-01-21 00:51:26,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:51:26,102 INFO L432 AbstractCegarLoop]: Abstraction has 409 states and 464 transitions. [2018-01-21 00:51:26,102 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 00:51:26,102 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 464 transitions. [2018-01-21 00:51:26,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 473 [2018-01-21 00:51:26,105 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:51:26,105 INFO L322 BasicCegarLoop]: trace histogram [71, 59, 59, 59, 59, 13, 12, 12, 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, 1] [2018-01-21 00:51:26,105 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:51:26,105 INFO L82 PathProgramCache]: Analyzing trace with hash 1199895744, now seen corresponding path program 11 times [2018-01-21 00:51:26,105 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:51:26,106 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:51:26,106 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:51:26,106 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:51:26,106 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:51:26,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:51:26,143 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:51:26,671 INFO L134 CoverageAnalysis]: Checked inductivity of 10853 backedges. 0 proven. 486 refuted. 0 times theorem prover too weak. 10367 trivial. 0 not checked. [2018-01-21 00:51:26,671 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:51:26,671 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:51:26,671 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:51:26,671 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:51:26,671 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:51:26,671 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 00:51:26,676 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:51:26,676 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:51:26,699 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:26,706 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:26,712 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:26,752 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:26,760 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:26,770 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:26,783 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:26,794 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:26,796 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:51:26,803 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:51:27,084 INFO L134 CoverageAnalysis]: Checked inductivity of 10853 backedges. 6406 proven. 313 refuted. 0 times theorem prover too weak. 4134 trivial. 0 not checked. [2018-01-21 00:51:27,084 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:51:27,698 INFO L134 CoverageAnalysis]: Checked inductivity of 10853 backedges. 1168 proven. 1655 refuted. 0 times theorem prover too weak. 8030 trivial. 0 not checked. [2018-01-21 00:51:27,730 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:51:27,731 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 00:51:27,734 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:51:27,734 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:51:27,768 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:27,790 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:27,829 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:27,963 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:40,002 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:51:52,057 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown