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_preciseopt.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength2_true-valid-memsafety.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 08:46:47,374 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 08:46:47,375 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 08:46:47,390 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 08:46:47,391 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 08:46:47,392 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 08:46:47,393 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 08:46:47,394 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 08:46:47,397 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 08:46:47,397 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 08:46:47,398 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 08:46:47,399 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 08:46:47,399 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 08:46:47,401 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 08:46:47,402 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 08:46:47,404 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 08:46:47,406 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 08:46:47,408 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 08:46:47,410 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 08:46:47,411 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 08:46:47,413 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 08:46:47,418 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 08:46:47,419 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 08:46:47,419 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_preciseopt.epf [2018-01-21 08:46:47,427 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 08:46:47,427 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 08:46:47,428 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 08:46:47,428 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 08:46:47,428 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 08:46:47,429 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 08:46:47,429 INFO L133 SettingsManager]: * Flatten before fatten=true [2018-01-21 08:46:47,429 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 08:46:47,429 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 08:46:47,429 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 08:46:47,430 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 08:46:47,430 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 08:46:47,430 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 08:46:47,430 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 08:46:47,430 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 08:46:47,430 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 08:46:47,431 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 08:46:47,431 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 08:46:47,431 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 08:46:47,431 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 08:46:47,431 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 08:46:47,431 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 08:46:47,431 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 08:46:47,432 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 08:46:47,432 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 08:46:47,432 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 08:46:47,432 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 08:46:47,432 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 08:46:47,433 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 08:46:47,433 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 08:46:47,433 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 08:46:47,433 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 08:46:47,433 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 08:46:47,433 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 08:46:47,433 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 08:46:47,433 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 08:46:47,433 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 08:46:47,434 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 08:46:47,434 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 08:46:47,434 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 08:46:47,465 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 08:46:47,476 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 08:46:47,479 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 08:46:47,481 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 08:46:47,481 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 08:46:47,482 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength2_true-valid-memsafety.c [2018-01-21 08:46:47,595 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 08:46:47,599 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 08:46:47,600 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 08:46:47,600 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 08:46:47,605 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 08:46:47,606 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:46:47" (1/1) ... [2018-01-21 08:46:47,609 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@622e8ae8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:46:47, skipping insertion in model container [2018-01-21 08:46:47,609 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:46:47" (1/1) ... [2018-01-21 08:46:47,623 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:46:47,638 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:46:47,750 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:46:47,769 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:46:47,776 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:46:47 WrapperNode [2018-01-21 08:46:47,776 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 08:46:47,777 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 08:46:47,777 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 08:46:47,777 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 08:46:47,787 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:46:47" (1/1) ... [2018-01-21 08:46:47,788 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:46:47" (1/1) ... [2018-01-21 08:46:47,796 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:46:47" (1/1) ... [2018-01-21 08:46:47,796 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:46:47" (1/1) ... [2018-01-21 08:46:47,800 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:46:47" (1/1) ... [2018-01-21 08:46:47,803 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:46:47" (1/1) ... [2018-01-21 08:46:47,805 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:46:47" (1/1) ... [2018-01-21 08:46:47,807 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 08:46:47,807 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 08:46:47,807 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 08:46:47,808 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 08:46:47,809 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:46:47" (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 08:46:47,858 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 08:46:47,858 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 08:46:47,858 INFO L136 BoogieDeclarations]: Found implementation of procedure bar [2018-01-21 08:46:47,858 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 08:46:47,859 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 08:46:47,859 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 08:46:47,859 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 08:46:47,859 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 08:46:47,859 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 08:46:47,859 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 08:46:47,859 INFO L128 BoogieDeclarations]: Found specification of procedure bar [2018-01-21 08:46:47,859 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 08:46:47,859 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 08:46:47,859 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 08:46:47,859 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 08:46:48,073 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 08:46:48,074 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:46:48 BoogieIcfgContainer [2018-01-21 08:46:48,074 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 08:46:48,075 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 08:46:48,075 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 08:46:48,077 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 08:46:48,078 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 08:46:47" (1/3) ... [2018-01-21 08:46:48,079 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65bc6d52 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:46:48, skipping insertion in model container [2018-01-21 08:46:48,079 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:46:47" (2/3) ... [2018-01-21 08:46:48,080 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65bc6d52 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:46:48, skipping insertion in model container [2018-01-21 08:46:48,080 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:46:48" (3/3) ... [2018-01-21 08:46:48,082 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength2_true-valid-memsafety.c [2018-01-21 08:46:48,091 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 08:46:48,098 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 5 error locations. [2018-01-21 08:46:48,138 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:46:48,138 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:46:48,138 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:46:48,139 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:46:48,139 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:46:48,139 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:46:48,139 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:46:48,139 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == barErr0EnsuresViolation======== [2018-01-21 08:46:48,140 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:46:48,161 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states. [2018-01-21 08:46:48,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-01-21 08:46:48,168 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:46:48,169 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:46:48,169 INFO L371 AbstractCegarLoop]: === Iteration 1 === [barErr0EnsuresViolation]=== [2018-01-21 08:46:48,175 INFO L82 PathProgramCache]: Analyzing trace with hash -492377012, now seen corresponding path program 1 times [2018-01-21 08:46:48,178 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:46:48,222 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:46:48,222 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:46:48,223 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:46:48,223 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:46:48,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:46:48,275 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:46:48,310 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 08:46:48,312 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:46:48,312 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:46:48,312 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:46:48,314 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:46:48,325 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:46:48,326 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:46:48,328 INFO L87 Difference]: Start difference. First operand 62 states. Second operand 2 states. [2018-01-21 08:46:48,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:46:48,350 INFO L93 Difference]: Finished difference Result 114 states and 135 transitions. [2018-01-21 08:46:48,350 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:46:48,351 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 20 [2018-01-21 08:46:48,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:46:48,357 INFO L225 Difference]: With dead ends: 114 [2018-01-21 08:46:48,357 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 08:46:48,360 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 08:46:48,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 08:46:48,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 08:46:48,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 08:46:48,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 08:46:48,382 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 20 [2018-01-21 08:46:48,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:46:48,382 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 08:46:48,383 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:46:48,383 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 08:46:48,383 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 08:46:48,389 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-01-21 08:46:48,491 INFO L404 ceAbstractionStarter]: At program point L13'''(lines 13 15) the Hoare annotation is: true [2018-01-21 08:46:48,491 INFO L401 ceAbstractionStarter]: For program point barErr0EnsuresViolation(lines 11 17) no Hoare annotation was computed. [2018-01-21 08:46:48,491 INFO L401 ceAbstractionStarter]: For program point L13''(lines 13 15) no Hoare annotation was computed. [2018-01-21 08:46:48,491 INFO L401 ceAbstractionStarter]: For program point L14(line 14) no Hoare annotation was computed. [2018-01-21 08:46:48,491 INFO L401 ceAbstractionStarter]: For program point L13(lines 13 15) no Hoare annotation was computed. [2018-01-21 08:46:48,492 INFO L404 ceAbstractionStarter]: At program point barENTRY(lines 11 17) the Hoare annotation is: true [2018-01-21 08:46:48,492 INFO L401 ceAbstractionStarter]: For program point L13''''(lines 13 15) no Hoare annotation was computed. [2018-01-21 08:46:48,492 INFO L401 ceAbstractionStarter]: For program point barFINAL(lines 11 17) no Hoare annotation was computed. [2018-01-21 08:46:48,492 INFO L401 ceAbstractionStarter]: For program point L14'(line 14) no Hoare annotation was computed. [2018-01-21 08:46:48,492 INFO L401 ceAbstractionStarter]: For program point barEXIT(lines 11 17) no Hoare annotation was computed. [2018-01-21 08:46:48,492 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.initErr0EnsuresViolation(lines 1 43) no Hoare annotation was computed. [2018-01-21 08:46:48,492 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(lines 1 43) no Hoare annotation was computed. [2018-01-21 08:46:48,493 INFO L404 ceAbstractionStarter]: At program point ULTIMATE.initENTRY(lines 1 43) the Hoare annotation is: true [2018-01-21 08:46:48,493 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.initFINAL(lines 1 43) no Hoare annotation was computed. [2018-01-21 08:46:48,493 INFO L401 ceAbstractionStarter]: For program point fooEXIT(lines 20 29) no Hoare annotation was computed. [2018-01-21 08:46:48,493 INFO L401 ceAbstractionStarter]: For program point L21(line 21) no Hoare annotation was computed. [2018-01-21 08:46:48,493 INFO L401 ceAbstractionStarter]: For program point L23(line 23) no Hoare annotation was computed. [2018-01-21 08:46:48,493 INFO L401 ceAbstractionStarter]: For program point L22(lines 22 24) no Hoare annotation was computed. [2018-01-21 08:46:48,494 INFO L401 ceAbstractionStarter]: For program point L25(line 25) no Hoare annotation was computed. [2018-01-21 08:46:48,494 INFO L401 ceAbstractionStarter]: For program point L23'(line 23) no Hoare annotation was computed. [2018-01-21 08:46:48,494 INFO L401 ceAbstractionStarter]: For program point L21'''''(line 21) no Hoare annotation was computed. [2018-01-21 08:46:48,494 INFO L401 ceAbstractionStarter]: For program point L25'(lines 25 27) no Hoare annotation was computed. [2018-01-21 08:46:48,494 INFO L401 ceAbstractionStarter]: For program point L21'''(line 21) no Hoare annotation was computed. [2018-01-21 08:46:48,494 INFO L401 ceAbstractionStarter]: For program point L21'(line 21) no Hoare annotation was computed. [2018-01-21 08:46:48,494 INFO L401 ceAbstractionStarter]: For program point fooFINAL(lines 20 29) no Hoare annotation was computed. [2018-01-21 08:46:48,495 INFO L404 ceAbstractionStarter]: At program point fooENTRY(lines 20 29) the Hoare annotation is: true [2018-01-21 08:46:48,495 INFO L401 ceAbstractionStarter]: For program point L22''(lines 22 24) no Hoare annotation was computed. [2018-01-21 08:46:48,495 INFO L401 ceAbstractionStarter]: For program point L23''(line 23) no Hoare annotation was computed. [2018-01-21 08:46:48,495 INFO L401 ceAbstractionStarter]: For program point L21''(line 21) no Hoare annotation was computed. [2018-01-21 08:46:48,495 INFO L404 ceAbstractionStarter]: At program point L22''''(lines 22 24) the Hoare annotation is: true [2018-01-21 08:46:48,495 INFO L404 ceAbstractionStarter]: At program point L22'''(lines 22 24) the Hoare annotation is: true [2018-01-21 08:46:48,496 INFO L401 ceAbstractionStarter]: For program point fooErr0EnsuresViolation(lines 20 29) no Hoare annotation was computed. [2018-01-21 08:46:48,496 INFO L401 ceAbstractionStarter]: For program point L21''''(line 21) no Hoare annotation was computed. [2018-01-21 08:46:48,496 INFO L404 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(lines 1 43) the Hoare annotation is: true [2018-01-21 08:46:48,496 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(lines 1 43) no Hoare annotation was computed. [2018-01-21 08:46:48,496 INFO L404 ceAbstractionStarter]: At program point L1(lines 1 43) the Hoare annotation is: true [2018-01-21 08:46:48,496 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.startErr0EnsuresViolation(lines 1 43) no Hoare annotation was computed. [2018-01-21 08:46:48,496 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(lines 1 43) no Hoare annotation was computed. [2018-01-21 08:46:48,497 INFO L404 ceAbstractionStarter]: At program point L36''(lines 36 40) the Hoare annotation is: true [2018-01-21 08:46:48,497 INFO L401 ceAbstractionStarter]: For program point L33''(lines 33 35) no Hoare annotation was computed. [2018-01-21 08:46:48,497 INFO L401 ceAbstractionStarter]: For program point L34''(line 34) no Hoare annotation was computed. [2018-01-21 08:46:48,497 INFO L404 ceAbstractionStarter]: At program point L33'''(lines 33 35) the Hoare annotation is: true [2018-01-21 08:46:48,497 INFO L401 ceAbstractionStarter]: For program point L32''(line 32) no Hoare annotation was computed. [2018-01-21 08:46:48,497 INFO L401 ceAbstractionStarter]: For program point L37'(line 37) no Hoare annotation was computed. [2018-01-21 08:46:48,497 INFO L401 ceAbstractionStarter]: For program point L32''''(line 32) no Hoare annotation was computed. [2018-01-21 08:46:48,498 INFO L401 ceAbstractionStarter]: For program point L32'''''(line 32) no Hoare annotation was computed. [2018-01-21 08:46:48,498 INFO L401 ceAbstractionStarter]: For program point mainErr0EnsuresViolation(lines 31 42) no Hoare annotation was computed. [2018-01-21 08:46:48,498 INFO L401 ceAbstractionStarter]: For program point L36'''(lines 36 40) no Hoare annotation was computed. [2018-01-21 08:46:48,498 INFO L401 ceAbstractionStarter]: For program point mainFINAL(lines 31 42) no Hoare annotation was computed. [2018-01-21 08:46:48,498 INFO L401 ceAbstractionStarter]: For program point L32(line 32) no Hoare annotation was computed. [2018-01-21 08:46:48,498 INFO L401 ceAbstractionStarter]: For program point L32'''(line 32) no Hoare annotation was computed. [2018-01-21 08:46:48,499 INFO L404 ceAbstractionStarter]: At program point L34(line 34) the Hoare annotation is: true [2018-01-21 08:46:48,499 INFO L401 ceAbstractionStarter]: For program point L33(lines 33 35) no Hoare annotation was computed. [2018-01-21 08:46:48,499 INFO L401 ceAbstractionStarter]: For program point L34'''(line 34) no Hoare annotation was computed. [2018-01-21 08:46:48,499 INFO L401 ceAbstractionStarter]: For program point L33''''(lines 33 35) no Hoare annotation was computed. [2018-01-21 08:46:48,499 INFO L401 ceAbstractionStarter]: For program point L36(lines 36 40) no Hoare annotation was computed. [2018-01-21 08:46:48,499 INFO L401 ceAbstractionStarter]: For program point mainEXIT(lines 31 42) no Hoare annotation was computed. [2018-01-21 08:46:48,499 INFO L404 ceAbstractionStarter]: At program point mainENTRY(lines 31 42) the Hoare annotation is: true [2018-01-21 08:46:48,500 INFO L401 ceAbstractionStarter]: For program point L38(line 38) no Hoare annotation was computed. [2018-01-21 08:46:48,500 INFO L401 ceAbstractionStarter]: For program point L37(line 37) no Hoare annotation was computed. [2018-01-21 08:46:48,500 INFO L401 ceAbstractionStarter]: For program point L34'(line 34) no Hoare annotation was computed. [2018-01-21 08:46:48,500 INFO L401 ceAbstractionStarter]: For program point L32'(line 32) no Hoare annotation was computed. [2018-01-21 08:46:48,504 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:46:48,504 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:46:48,504 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:46:48,504 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:46:48,504 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:46:48,504 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:46:48,504 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:46:48,505 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 08:46:48,505 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:46:48,507 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states. [2018-01-21 08:46:48,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 08:46:48,508 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:46:48,508 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 08:46:48,508 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 08:46:48,509 INFO L82 PathProgramCache]: Analyzing trace with hash 136143, now seen corresponding path program 1 times [2018-01-21 08:46:48,509 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:46:48,510 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:46:48,510 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:46:48,510 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:46:48,510 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:46:48,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:46:48,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:46:48,541 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 08:46:48,545 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:46:48,548 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:46:48,549 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:46:48,549 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:46:48,549 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:46:48,549 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:46:48,549 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:46:48,549 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:46:48,549 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 08:46:48,549 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:46:48,551 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states. [2018-01-21 08:46:48,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-01-21 08:46:48,553 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:46:48,553 INFO L322 BasicCegarLoop]: trace histogram [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 08:46:48,553 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 08:46:48,553 INFO L82 PathProgramCache]: Analyzing trace with hash 1220349549, now seen corresponding path program 1 times [2018-01-21 08:46:48,554 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:46:48,554 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:46:48,554 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:46:48,554 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:46:48,555 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:46:48,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:46:48,570 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:46:48,592 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 08:46:48,593 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:46:48,593 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:46:48,593 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:46:48,593 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:46:48,594 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:46:48,594 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:46:48,594 INFO L87 Difference]: Start difference. First operand 62 states. Second operand 2 states. [2018-01-21 08:46:48,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:46:48,603 INFO L93 Difference]: Finished difference Result 114 states and 135 transitions. [2018-01-21 08:46:48,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:46:48,603 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 26 [2018-01-21 08:46:48,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:46:48,606 INFO L225 Difference]: With dead ends: 114 [2018-01-21 08:46:48,606 INFO L226 Difference]: Without dead ends: 43 [2018-01-21 08:46:48,607 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 08:46:48,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-01-21 08:46:48,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-01-21 08:46:48,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-21 08:46:48,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2018-01-21 08:46:48,618 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 26 [2018-01-21 08:46:48,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:46:48,618 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2018-01-21 08:46:48,618 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:46:48,618 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2018-01-21 08:46:48,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-01-21 08:46:48,619 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:46:48,619 INFO L322 BasicCegarLoop]: trace histogram [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 08:46:48,619 INFO L371 AbstractCegarLoop]: === Iteration 2 === [fooErr0EnsuresViolation]=== [2018-01-21 08:46:48,620 INFO L82 PathProgramCache]: Analyzing trace with hash 390316661, now seen corresponding path program 1 times [2018-01-21 08:46:48,620 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:46:48,621 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:46:48,621 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:46:48,621 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:46:48,621 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:46:48,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:46:48,647 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:46:48,742 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 08:46:48,743 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:46:48,743 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 08:46:48,743 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:46:48,745 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 08:46:48,745 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 08:46:48,745 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 08:46:48,746 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 4 states. [2018-01-21 08:46:48,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:46:48,841 INFO L93 Difference]: Finished difference Result 43 states and 46 transitions. [2018-01-21 08:46:48,846 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 08:46:48,846 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 28 [2018-01-21 08:46:48,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:46:48,847 INFO L225 Difference]: With dead ends: 43 [2018-01-21 08:46:48,847 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 08:46:48,848 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-01-21 08:46:48,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 08:46:48,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 08:46:48,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 08:46:48,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 08:46:48,849 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 28 [2018-01-21 08:46:48,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:46:48,849 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 08:46:48,850 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 08:46:48,850 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 08:46:48,850 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 08:46:48,854 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:46:48,854 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:46:48,854 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:46:48,854 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:46:48,855 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:46:48,855 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:46:48,855 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:46:48,855 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 08:46:48,855 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:46:48,856 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states. [2018-01-21 08:46:48,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 08:46:48,860 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:46:48,860 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 08:46:48,860 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:46:48,861 INFO L82 PathProgramCache]: Analyzing trace with hash -851979775, now seen corresponding path program 1 times [2018-01-21 08:46:48,861 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:46:48,862 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:46:48,862 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:46:48,862 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:46:48,862 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:46:48,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:46:48,868 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:46:48,875 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 08:46:48,876 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:46:48,876 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:46:48,876 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:46:48,876 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:46:48,876 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:46:48,877 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:46:48,877 INFO L87 Difference]: Start difference. First operand 62 states. Second operand 2 states. [2018-01-21 08:46:48,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:46:48,884 INFO L93 Difference]: Finished difference Result 114 states and 135 transitions. [2018-01-21 08:46:48,884 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:46:48,884 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 08:46:48,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:46:48,886 INFO L225 Difference]: With dead ends: 114 [2018-01-21 08:46:48,886 INFO L226 Difference]: Without dead ends: 57 [2018-01-21 08:46:48,886 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 08:46:48,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-01-21 08:46:48,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-01-21 08:46:48,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-01-21 08:46:48,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 62 transitions. [2018-01-21 08:46:48,893 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 62 transitions. Word has length 17 [2018-01-21 08:46:48,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:46:48,894 INFO L432 AbstractCegarLoop]: Abstraction has 57 states and 62 transitions. [2018-01-21 08:46:48,894 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:46:48,894 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 62 transitions. [2018-01-21 08:46:48,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 08:46:48,895 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:46:48,895 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 08:46:48,895 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:46:48,895 INFO L82 PathProgramCache]: Analyzing trace with hash -178858898, now seen corresponding path program 1 times [2018-01-21 08:46:48,896 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:46:48,896 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:46:48,897 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:46:48,897 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:46:48,897 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:46:48,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:46:48,903 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:46:48,926 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 08:46:48,927 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:46:48,927 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 08:46:48,927 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:46:48,927 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 08:46:48,928 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 08:46:48,928 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 08:46:48,928 INFO L87 Difference]: Start difference. First operand 57 states and 62 transitions. Second operand 3 states. [2018-01-21 08:46:48,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:46:48,978 INFO L93 Difference]: Finished difference Result 76 states and 84 transitions. [2018-01-21 08:46:48,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 08:46:48,979 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 08:46:48,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:46:48,981 INFO L225 Difference]: With dead ends: 76 [2018-01-21 08:46:48,982 INFO L226 Difference]: Without dead ends: 61 [2018-01-21 08:46:48,982 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 08:46:48,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-01-21 08:46:48,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 56. [2018-01-21 08:46:48,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-01-21 08:46:48,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2018-01-21 08:46:48,996 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 19 [2018-01-21 08:46:48,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:46:48,997 INFO L432 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2018-01-21 08:46:48,997 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 08:46:48,997 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2018-01-21 08:46:48,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-01-21 08:46:48,999 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:46:48,999 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:46:48,999 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:46:48,999 INFO L82 PathProgramCache]: Analyzing trace with hash -853032378, now seen corresponding path program 1 times [2018-01-21 08:46:48,999 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:46:49,000 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:46:49,001 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:46:49,001 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:46:49,001 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:46:49,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:46:49,020 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:46:49,068 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 08:46:49,069 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:46:49,069 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:46:49,070 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 47 with the following transitions: [2018-01-21 08:46:49,071 INFO L201 CegarAbsIntRunner]: [0], [4], [7], [17], [18], [20], [21], [23], [24], [25], [29], [32], [44], [50], [51], [52], [53], [58], [59], [60], [61], [65], [68], [70], [72], [73], [74], [76], [80], [84], [89], [90], [93], [95], [96], [97], [106], [108], [109], [110], [111], [112], [113], [114], [115] [2018-01-21 08:46:49,118 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 08:46:49,119 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 08:46:52,900 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 08:46:52,902 INFO L268 AbstractInterpreter]: Visited 45 different actions 81 times. Merged at 17 different actions 17 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 23 variables. [2018-01-21 08:46:52,930 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 08:46:52,930 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:46:52,931 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 08:46:52,941 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:46:52,941 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:46:52,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:46:52,979 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:46:53,000 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 08:46:53,001 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:46:53,056 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 08:46:53,090 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:46:53,090 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 08:46:53,097 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:46:53,097 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:46:53,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:46:53,153 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:46:53,161 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 08:46:53,161 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:46:53,241 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 08:46:53,243 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:46:53,243 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 08:46:53,244 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:46:53,244 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 08:46:53,244 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 08:46:53,244 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 08:46:53,245 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand 5 states. [2018-01-21 08:46:53,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:46:53,310 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2018-01-21 08:46:53,310 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 08:46:53,310 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 46 [2018-01-21 08:46:53,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:46:53,312 INFO L225 Difference]: With dead ends: 80 [2018-01-21 08:46:53,312 INFO L226 Difference]: Without dead ends: 68 [2018-01-21 08:46:53,313 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 181 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 08:46:53,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-01-21 08:46:53,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 63. [2018-01-21 08:46:53,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-01-21 08:46:53,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 68 transitions. [2018-01-21 08:46:53,321 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 68 transitions. Word has length 46 [2018-01-21 08:46:53,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:46:53,321 INFO L432 AbstractCegarLoop]: Abstraction has 63 states and 68 transitions. [2018-01-21 08:46:53,322 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 08:46:53,322 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 68 transitions. [2018-01-21 08:46:53,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-01-21 08:46:53,325 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:46:53,325 INFO L322 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 08:46:53,325 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:46:53,325 INFO L82 PathProgramCache]: Analyzing trace with hash -723838693, now seen corresponding path program 2 times [2018-01-21 08:46:53,326 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:46:53,326 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:46:53,327 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:46:53,327 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:46:53,327 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:46:53,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:46:53,351 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:46:53,432 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-01-21 08:46:53,433 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:46:53,433 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:46:53,433 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:46:53,434 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:46:53,434 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:46:53,435 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 08:46:53,447 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:46:53,447 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:46:53,467 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:46:53,483 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:46:53,486 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:46:53,491 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:46:53,548 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-01-21 08:46:53,548 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:46:53,768 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-01-21 08:46:53,790 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 08:46:53,790 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [5] total 12 [2018-01-21 08:46:53,790 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:46:53,791 INFO L409 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-01-21 08:46:53,791 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-01-21 08:46:53,791 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2018-01-21 08:46:53,791 INFO L87 Difference]: Start difference. First operand 63 states and 68 transitions. Second operand 7 states. [2018-01-21 08:46:53,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:46:53,907 INFO L93 Difference]: Finished difference Result 124 states and 137 transitions. [2018-01-21 08:46:53,907 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-01-21 08:46:53,907 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 71 [2018-01-21 08:46:53,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:46:53,911 INFO L225 Difference]: With dead ends: 124 [2018-01-21 08:46:53,911 INFO L226 Difference]: Without dead ends: 78 [2018-01-21 08:46:53,912 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 133 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2018-01-21 08:46:53,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-01-21 08:46:53,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 74. [2018-01-21 08:46:53,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-01-21 08:46:53,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 82 transitions. [2018-01-21 08:46:53,921 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 82 transitions. Word has length 71 [2018-01-21 08:46:53,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:46:53,921 INFO L432 AbstractCegarLoop]: Abstraction has 74 states and 82 transitions. [2018-01-21 08:46:53,921 INFO L433 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-01-21 08:46:53,921 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 82 transitions. [2018-01-21 08:46:53,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-01-21 08:46:53,924 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:46:53,924 INFO L322 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1] [2018-01-21 08:46:53,924 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:46:53,925 INFO L82 PathProgramCache]: Analyzing trace with hash 1699645763, now seen corresponding path program 1 times [2018-01-21 08:46:53,925 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:46:53,926 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:46:53,926 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:46:53,926 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:46:53,926 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:46:53,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:46:53,951 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:46:54,021 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2018-01-21 08:46:54,021 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:46:54,021 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:46:54,021 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 78 with the following transitions: [2018-01-21 08:46:54,022 INFO L201 CegarAbsIntRunner]: [0], [4], [7], [17], [18], [20], [21], [23], [24], [25], [29], [32], [34], [35], [36], [37], [39], [44], [50], [51], [52], [53], [58], [59], [60], [61], [65], [68], [70], [72], [73], [74], [76], [80], [84], [89], [90], [93], [95], [96], [97], [106], [108], [109], [110], [111], [112], [113], [114], [115] [2018-01-21 08:46:54,024 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 08:46:54,024 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 08:47:21,252 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 08:47:21,252 INFO L268 AbstractInterpreter]: Visited 50 different actions 161 times. Merged at 30 different actions 59 times. Never widened. Found 8 fixpoints after 4 different actions. Largest state had 25 variables. [2018-01-21 08:47:21,273 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 08:47:21,273 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:21,273 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 08:47:21,284 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:47:21,285 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:47:21,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:47:21,324 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:47:21,447 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-01-21 08:47:21,448 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:47:21,675 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-01-21 08:47:21,696 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 08:47:21,696 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5] total 13 [2018-01-21 08:47:21,696 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:47:21,697 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 08:47:21,697 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 08:47:21,697 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2018-01-21 08:47:21,697 INFO L87 Difference]: Start difference. First operand 74 states and 82 transitions. Second operand 8 states. [2018-01-21 08:47:21,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:47:21,800 INFO L93 Difference]: Finished difference Result 155 states and 174 transitions. [2018-01-21 08:47:21,800 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 08:47:21,800 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 77 [2018-01-21 08:47:21,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:47:21,801 INFO L225 Difference]: With dead ends: 155 [2018-01-21 08:47:21,801 INFO L226 Difference]: Without dead ends: 98 [2018-01-21 08:47:21,802 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 142 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2018-01-21 08:47:21,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2018-01-21 08:47:21,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 79. [2018-01-21 08:47:21,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-01-21 08:47:21,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 89 transitions. [2018-01-21 08:47:21,810 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 89 transitions. Word has length 77 [2018-01-21 08:47:21,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:47:21,810 INFO L432 AbstractCegarLoop]: Abstraction has 79 states and 89 transitions. [2018-01-21 08:47:21,811 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 08:47:21,811 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 89 transitions. [2018-01-21 08:47:21,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-01-21 08:47:21,813 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:47:21,813 INFO L322 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:47:21,813 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:47:21,813 INFO L82 PathProgramCache]: Analyzing trace with hash -1275911246, now seen corresponding path program 1 times [2018-01-21 08:47:21,813 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:47:21,814 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:21,814 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:47:21,815 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:21,815 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:47:21,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:47:21,840 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:47:21,918 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-01-21 08:47:21,918 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:21,918 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:47:21,919 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 83 with the following transitions: [2018-01-21 08:47:21,919 INFO L201 CegarAbsIntRunner]: [0], [4], [7], [9], [10], [11], [13], [17], [18], [20], [21], [23], [24], [25], [29], [32], [34], [35], [36], [37], [39], [44], [50], [51], [52], [53], [58], [59], [60], [61], [65], [68], [70], [72], [73], [74], [76], [80], [84], [89], [90], [93], [95], [96], [97], [106], [108], [109], [110], [111], [112], [113], [114], [115] [2018-01-21 08:47:21,921 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 08:47:21,922 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 08:47:39,145 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 08:47:39,146 INFO L268 AbstractInterpreter]: Visited 54 different actions 223 times. Merged at 38 different actions 103 times. Never widened. Found 17 fixpoints after 7 different actions. Largest state had 25 variables. [2018-01-21 08:47:39,152 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 08:47:39,152 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:39,152 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:47:39,157 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:47:39,158 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:47:39,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:47:39,184 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:47:39,199 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-01-21 08:47:39,199 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:47:39,247 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-01-21 08:47:39,267 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:39,267 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:47:39,270 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:47:39,270 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:47:39,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:47:39,317 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:47:39,323 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-01-21 08:47:39,323 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:47:39,348 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-01-21 08:47:39,350 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:47:39,350 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 9 [2018-01-21 08:47:39,350 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:47:39,350 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 08:47:39,350 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 08:47:39,350 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 08:47:39,351 INFO L87 Difference]: Start difference. First operand 79 states and 89 transitions. Second operand 6 states. [2018-01-21 08:47:39,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:47:39,390 INFO L93 Difference]: Finished difference Result 103 states and 116 transitions. [2018-01-21 08:47:39,390 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 08:47:39,390 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 82 [2018-01-21 08:47:39,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:47:39,391 INFO L225 Difference]: With dead ends: 103 [2018-01-21 08:47:39,391 INFO L226 Difference]: Without dead ends: 91 [2018-01-21 08:47:39,391 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 324 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 08:47:39,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-01-21 08:47:39,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 86. [2018-01-21 08:47:39,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-01-21 08:47:39,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 97 transitions. [2018-01-21 08:47:39,399 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 97 transitions. Word has length 82 [2018-01-21 08:47:39,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:47:39,399 INFO L432 AbstractCegarLoop]: Abstraction has 86 states and 97 transitions. [2018-01-21 08:47:39,399 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 08:47:39,400 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 97 transitions. [2018-01-21 08:47:39,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2018-01-21 08:47:39,402 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:47:39,402 INFO L322 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:47:39,402 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:47:39,402 INFO L82 PathProgramCache]: Analyzing trace with hash 858734366, now seen corresponding path program 2 times [2018-01-21 08:47:39,403 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:47:39,403 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:39,403 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:47:39,404 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:39,404 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:47:39,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:47:39,431 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:47:39,523 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 89 trivial. 0 not checked. [2018-01-21 08:47:39,523 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:39,523 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:47:39,524 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:47:39,524 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:47:39,524 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:39,524 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:47:39,531 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:47:39,531 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:47:39,545 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:47:39,565 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:47:39,568 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:47:39,572 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:47:39,627 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 61 proven. 2 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2018-01-21 08:47:39,628 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:47:39,774 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 61 proven. 2 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2018-01-21 08:47:39,794 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:39,794 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:47:39,797 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:47:39,797 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:47:39,812 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:47:39,847 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:47:39,874 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:47:39,879 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:47:39,899 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 89 trivial. 0 not checked. [2018-01-21 08:47:39,899 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:47:39,984 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 89 trivial. 0 not checked. [2018-01-21 08:47:39,985 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:47:39,986 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 9, 6, 6] total 21 [2018-01-21 08:47:39,986 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:47:39,986 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-21 08:47:39,986 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-21 08:47:39,987 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=328, Unknown=0, NotChecked=0, Total=420 [2018-01-21 08:47:39,987 INFO L87 Difference]: Start difference. First operand 86 states and 97 transitions. Second operand 13 states. [2018-01-21 08:47:40,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:47:40,158 INFO L93 Difference]: Finished difference Result 233 states and 270 transitions. [2018-01-21 08:47:40,159 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 08:47:40,159 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 118 [2018-01-21 08:47:40,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:47:40,160 INFO L225 Difference]: With dead ends: 233 [2018-01-21 08:47:40,160 INFO L226 Difference]: Without dead ends: 163 [2018-01-21 08:47:40,161 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 455 SyntacticMatches, 5 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=152, Invalid=550, Unknown=0, NotChecked=0, Total=702 [2018-01-21 08:47:40,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-01-21 08:47:40,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 119. [2018-01-21 08:47:40,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-01-21 08:47:40,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 135 transitions. [2018-01-21 08:47:40,170 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 135 transitions. Word has length 118 [2018-01-21 08:47:40,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:47:40,171 INFO L432 AbstractCegarLoop]: Abstraction has 119 states and 135 transitions. [2018-01-21 08:47:40,171 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-21 08:47:40,171 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 135 transitions. [2018-01-21 08:47:40,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2018-01-21 08:47:40,173 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:47:40,173 INFO L322 BasicCegarLoop]: trace histogram [9, 7, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:47:40,173 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:47:40,173 INFO L82 PathProgramCache]: Analyzing trace with hash 1795019066, now seen corresponding path program 3 times [2018-01-21 08:47:40,174 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:47:40,174 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:40,174 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:47:40,175 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:40,175 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:47:40,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:47:40,206 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:47:40,316 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2018-01-21 08:47:40,317 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:40,317 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:47:40,317 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:47:40,317 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:47:40,317 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:40,317 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:47:40,322 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:47:40,322 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:47:40,338 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:47:40,345 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:47:40,352 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:47:40,354 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:47:40,358 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:47:40,415 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 142 proven. 2 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-01-21 08:47:40,415 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:47:40,613 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 142 proven. 2 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-01-21 08:47:40,633 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:40,633 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:47:40,636 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:47:40,636 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:47:40,653 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:47:40,666 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:47:40,690 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:47:40,704 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:47:40,709 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:47:40,727 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 142 proven. 2 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-01-21 08:47:40,727 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:47:40,958 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 142 proven. 2 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-01-21 08:47:40,960 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:47:40,960 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9, 9, 9] total 18 [2018-01-21 08:47:40,960 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:47:40,960 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-21 08:47:40,960 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-21 08:47:40,961 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2018-01-21 08:47:40,961 INFO L87 Difference]: Start difference. First operand 119 states and 135 transitions. Second operand 12 states. [2018-01-21 08:47:41,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:47:41,115 INFO L93 Difference]: Finished difference Result 199 states and 235 transitions. [2018-01-21 08:47:41,115 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 08:47:41,115 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 166 [2018-01-21 08:47:41,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:47:41,117 INFO L225 Difference]: With dead ends: 199 [2018-01-21 08:47:41,117 INFO L226 Difference]: Without dead ends: 169 [2018-01-21 08:47:41,118 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 673 GetRequests, 648 SyntacticMatches, 6 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2018-01-21 08:47:41,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-01-21 08:47:41,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 142. [2018-01-21 08:47:41,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-01-21 08:47:41,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 163 transitions. [2018-01-21 08:47:41,131 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 163 transitions. Word has length 166 [2018-01-21 08:47:41,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:47:41,132 INFO L432 AbstractCegarLoop]: Abstraction has 142 states and 163 transitions. [2018-01-21 08:47:41,132 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-21 08:47:41,132 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 163 transitions. [2018-01-21 08:47:41,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 224 [2018-01-21 08:47:41,134 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:47:41,134 INFO L322 BasicCegarLoop]: trace histogram [12, 12, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 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 08:47:41,134 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:47:41,135 INFO L82 PathProgramCache]: Analyzing trace with hash -234037377, now seen corresponding path program 4 times [2018-01-21 08:47:41,135 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:47:41,135 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:41,135 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:47:41,135 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:41,135 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:47:41,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:47:41,169 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:47:41,334 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-01-21 08:47:41,334 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:41,334 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:47:41,334 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:47:41,334 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:47:41,334 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:41,334 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:47:41,339 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:47:41,339 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:47:41,384 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:47:41,388 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:47:41,471 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 395 proven. 10 refuted. 0 times theorem prover too weak. 226 trivial. 0 not checked. [2018-01-21 08:47:41,471 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:47:41,627 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 161 proven. 53 refuted. 0 times theorem prover too weak. 417 trivial. 0 not checked. [2018-01-21 08:47:41,647 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:41,647 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:47:41,650 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:47:41,650 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:47:41,756 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:47:41,767 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:47:41,821 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 395 proven. 10 refuted. 0 times theorem prover too weak. 226 trivial. 0 not checked. [2018-01-21 08:47:41,821 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:47:41,952 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 161 proven. 53 refuted. 0 times theorem prover too weak. 417 trivial. 0 not checked. [2018-01-21 08:47:41,953 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:47:41,953 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 11, 11, 11] total 21 [2018-01-21 08:47:41,953 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:47:41,954 INFO L409 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-01-21 08:47:41,954 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-01-21 08:47:41,954 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2018-01-21 08:47:41,954 INFO L87 Difference]: Start difference. First operand 142 states and 163 transitions. Second operand 17 states. [2018-01-21 08:47:42,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:47:42,189 INFO L93 Difference]: Finished difference Result 451 states and 547 transitions. [2018-01-21 08:47:42,189 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 08:47:42,189 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 223 [2018-01-21 08:47:42,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:47:42,191 INFO L225 Difference]: With dead ends: 451 [2018-01-21 08:47:42,192 INFO L226 Difference]: Without dead ends: 356 [2018-01-21 08:47:42,193 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 911 GetRequests, 871 SyntacticMatches, 12 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=697, Unknown=0, NotChecked=0, Total=870 [2018-01-21 08:47:42,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2018-01-21 08:47:42,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 181. [2018-01-21 08:47:42,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2018-01-21 08:47:42,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 207 transitions. [2018-01-21 08:47:42,207 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 207 transitions. Word has length 223 [2018-01-21 08:47:42,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:47:42,208 INFO L432 AbstractCegarLoop]: Abstraction has 181 states and 207 transitions. [2018-01-21 08:47:42,208 INFO L433 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-01-21 08:47:42,208 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 207 transitions. [2018-01-21 08:47:42,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 284 [2018-01-21 08:47:42,212 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:47:42,212 INFO L322 BasicCegarLoop]: trace histogram [18, 14, 12, 12, 12, 12, 12, 8, 8, 8, 8, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 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 08:47:42,212 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:47:42,213 INFO L82 PathProgramCache]: Analyzing trace with hash 634716707, now seen corresponding path program 5 times [2018-01-21 08:47:42,213 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:47:42,213 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:42,214 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:47:42,214 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:47:42,214 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:47:42,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:47:42,257 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:47:42,451 INFO L134 CoverageAnalysis]: Checked inductivity of 1163 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1046 trivial. 0 not checked. [2018-01-21 08:47:42,451 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:42,452 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:47:42,452 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:47:42,452 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:47:42,452 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:42,452 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:47:42,474 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:47:42,474 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:47:42,499 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:47:42,509 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:47:42,524 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:47:42,526 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:47:42,530 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:47:42,715 INFO L134 CoverageAnalysis]: Checked inductivity of 1163 backedges. 628 proven. 33 refuted. 0 times theorem prover too weak. 502 trivial. 0 not checked. [2018-01-21 08:47:42,715 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:47:43,020 INFO L134 CoverageAnalysis]: Checked inductivity of 1163 backedges. 126 proven. 376 refuted. 0 times theorem prover too weak. 661 trivial. 0 not checked. [2018-01-21 08:47:43,040 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:47:43,040 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:47:43,043 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:47:43,043 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:47:43,074 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:47:43,101 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