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/ArraysOfVariableLength_false-valid-deref-read.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 08:41:43,696 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 08:41:43,712 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 08:41:43,724 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 08:41:43,724 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 08:41:43,725 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 08:41:43,727 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 08:41:43,728 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 08:41:43,731 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 08:41:43,731 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 08:41:43,732 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 08:41:43,732 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 08:41:43,733 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 08:41:43,734 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 08:41:43,735 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 08:41:43,738 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 08:41:43,740 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 08:41:43,742 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 08:41:43,743 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 08:41:43,745 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 08:41:43,747 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 08:41:43,747 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 08:41:43,748 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 08:41:43,749 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 08:41:43,749 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 08:41:43,751 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 08:41:43,751 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 08:41:43,752 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 08:41:43,752 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 08:41:43,752 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 08:41:43,753 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 08:41:43,753 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 08:41:43,764 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 08:41:43,764 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 08:41:43,765 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 08:41:43,765 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 08:41:43,765 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 08:41:43,765 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 08:41:43,766 INFO L133 SettingsManager]: * Flatten before fatten=true [2018-01-21 08:41:43,766 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 08:41:43,766 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 08:41:43,767 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 08:41:43,767 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 08:41:43,767 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 08:41:43,767 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 08:41:43,767 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 08:41:43,768 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 08:41:43,768 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 08:41:43,768 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 08:41:43,768 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 08:41:43,768 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 08:41:43,768 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 08:41:43,769 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 08:41:43,769 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 08:41:43,769 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 08:41:43,769 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 08:41:43,769 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 08:41:43,769 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 08:41:43,770 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 08:41:43,770 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 08:41:43,770 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 08:41:43,770 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 08:41:43,770 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 08:41:43,771 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 08:41:43,771 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 08:41:43,771 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 08:41:43,771 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 08:41:43,771 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 08:41:43,771 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 08:41:43,772 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 08:41:43,772 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 08:41:43,773 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 08:41:43,809 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 08:41:43,821 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 08:41:43,826 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 08:41:43,827 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 08:41:43,828 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 08:41:43,828 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_false-valid-deref-read.c [2018-01-21 08:41:43,948 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 08:41:43,954 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 08:41:43,955 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 08:41:43,955 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 08:41:43,963 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 08:41:43,964 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:41:43" (1/1) ... [2018-01-21 08:41:43,967 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ca73ec6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:43, skipping insertion in model container [2018-01-21 08:41:43,967 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:41:43" (1/1) ... [2018-01-21 08:41:43,982 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:41:44,002 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:41:44,115 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:41:44,133 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:41:44,139 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:44 WrapperNode [2018-01-21 08:41:44,139 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 08:41:44,140 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 08:41:44,140 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 08:41:44,140 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 08:41:44,156 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:44" (1/1) ... [2018-01-21 08:41:44,157 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:44" (1/1) ... [2018-01-21 08:41:44,167 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:44" (1/1) ... [2018-01-21 08:41:44,167 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:44" (1/1) ... [2018-01-21 08:41:44,170 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:44" (1/1) ... [2018-01-21 08:41:44,173 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:44" (1/1) ... [2018-01-21 08:41:44,174 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:44" (1/1) ... [2018-01-21 08:41:44,175 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 08:41:44,175 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 08:41:44,175 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 08:41:44,175 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 08:41:44,176 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:44" (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 08:41:44,225 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 08:41:44,225 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 08:41:44,225 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 08:41:44,226 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 08:41:44,226 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 08:41:44,226 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 08:41:44,226 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 08:41:44,226 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 08:41:44,226 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 08:41:44,226 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 08:41:44,226 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 08:41:44,226 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 08:41:44,227 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 08:41:44,402 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 08:41:44,403 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:41:44 BoogieIcfgContainer [2018-01-21 08:41:44,403 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 08:41:44,403 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 08:41:44,404 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 08:41:44,405 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 08:41:44,405 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 08:41:43" (1/3) ... [2018-01-21 08:41:44,406 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6862f056 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:41:44, skipping insertion in model container [2018-01-21 08:41:44,407 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:44" (2/3) ... [2018-01-21 08:41:44,407 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6862f056 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:41:44, skipping insertion in model container [2018-01-21 08:41:44,407 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:41:44" (3/3) ... [2018-01-21 08:41:44,409 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength_false-valid-deref-read.c [2018-01-21 08:41:44,417 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 08:41:44,423 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 08:41:44,462 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:41:44,463 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:41:44,463 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:41:44,463 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:41:44,463 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:41:44,463 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:41:44,463 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:41:44,464 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 08:41:44,465 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:41:44,486 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states. [2018-01-21 08:41:44,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 08:41:44,494 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:44,495 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 08:41:44,495 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 08:41:44,501 INFO L82 PathProgramCache]: Analyzing trace with hash 102829, now seen corresponding path program 1 times [2018-01-21 08:41:44,504 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:44,564 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:44,564 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:44,565 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:44,565 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:44,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:41:44,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:41:44,624 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 08:41:44,631 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:41:44,637 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:41:44,637 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:41:44,637 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:41:44,637 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:41:44,638 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:41:44,638 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:41:44,638 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:41:44,638 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 08:41:44,638 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:41:44,640 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states. [2018-01-21 08:41:44,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 08:41:44,641 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:44,642 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:41:44,642 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 08:41:44,642 INFO L82 PathProgramCache]: Analyzing trace with hash 33657389, now seen corresponding path program 1 times [2018-01-21 08:41:44,642 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:44,643 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:44,644 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:44,644 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:44,644 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:44,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:44,671 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:44,704 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 08:41:44,706 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:41:44,706 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:41:44,706 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:41:44,708 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:41:44,718 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:41:44,719 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:41:44,721 INFO L87 Difference]: Start difference. First operand 43 states. Second operand 2 states. [2018-01-21 08:41:44,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:44,744 INFO L93 Difference]: Finished difference Result 76 states and 90 transitions. [2018-01-21 08:41:44,744 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:41:44,745 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 08:41:44,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:44,752 INFO L225 Difference]: With dead ends: 76 [2018-01-21 08:41:44,752 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 08:41:44,756 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 08:41:44,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 08:41:44,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 08:41:44,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 08:41:44,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 08:41:44,851 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 08:41:44,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:44,851 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 08:41:44,851 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:41:44,851 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 08:41:44,851 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 08:41:44,854 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:41:44,854 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:41:44,854 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:41:44,854 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:41:44,854 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:41:44,854 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:41:44,855 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:41:44,855 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 08:41:44,855 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:41:44,857 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states. [2018-01-21 08:41:44,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 08:41:44,858 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:44,858 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 08:41:44,858 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:41:44,859 INFO L82 PathProgramCache]: Analyzing trace with hash 1331820257, now seen corresponding path program 1 times [2018-01-21 08:41:44,859 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:44,860 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:44,860 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:44,860 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:44,861 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:44,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:44,870 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:44,883 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 08:41:44,884 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:41:44,884 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:41:44,884 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:41:44,885 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:41:44,885 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:41:44,885 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:41:44,885 INFO L87 Difference]: Start difference. First operand 43 states. Second operand 2 states. [2018-01-21 08:41:44,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:44,891 INFO L93 Difference]: Finished difference Result 76 states and 90 transitions. [2018-01-21 08:41:44,891 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:41:44,891 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 08:41:44,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:44,894 INFO L225 Difference]: With dead ends: 76 [2018-01-21 08:41:44,894 INFO L226 Difference]: Without dead ends: 39 [2018-01-21 08:41:44,895 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 08:41:44,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-01-21 08:41:44,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-01-21 08:41:44,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-01-21 08:41:44,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2018-01-21 08:41:44,909 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 17 [2018-01-21 08:41:44,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:44,909 INFO L432 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2018-01-21 08:41:44,909 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:41:44,909 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2018-01-21 08:41:44,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 08:41:44,910 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:44,910 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 08:41:44,911 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:41:44,911 INFO L82 PathProgramCache]: Analyzing trace with hash -1785977394, now seen corresponding path program 1 times [2018-01-21 08:41:44,911 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:44,912 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:44,912 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:44,912 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:44,913 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:44,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:44,926 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:44,962 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 08:41:44,962 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:41:44,962 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 08:41:44,963 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:41:44,964 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 08:41:44,964 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 08:41:44,964 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 08:41:44,965 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 3 states. [2018-01-21 08:41:45,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:45,009 INFO L93 Difference]: Finished difference Result 58 states and 64 transitions. [2018-01-21 08:41:45,009 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 08:41:45,009 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 08:41:45,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:45,011 INFO L225 Difference]: With dead ends: 58 [2018-01-21 08:41:45,011 INFO L226 Difference]: Without dead ends: 43 [2018-01-21 08:41:45,012 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 08:41:45,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-01-21 08:41:45,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 38. [2018-01-21 08:41:45,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-01-21 08:41:45,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-01-21 08:41:45,021 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 19 [2018-01-21 08:41:45,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:45,021 INFO L432 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-01-21 08:41:45,021 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 08:41:45,021 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-01-21 08:41:45,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 08:41:45,022 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:45,023 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:41:45,023 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:41:45,023 INFO L82 PathProgramCache]: Analyzing trace with hash -751966911, now seen corresponding path program 1 times [2018-01-21 08:41:45,023 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:45,024 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:45,025 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:45,025 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:45,025 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:45,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:45,048 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:45,203 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:41:45,204 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:41:45,204 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-01-21 08:41:45,204 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:41:45,205 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 08:41:45,205 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 08:41:45,205 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-01-21 08:41:45,206 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 6 states. [2018-01-21 08:41:45,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:45,359 INFO L93 Difference]: Finished difference Result 79 states and 86 transitions. [2018-01-21 08:41:45,359 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 08:41:45,360 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 34 [2018-01-21 08:41:45,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:45,362 INFO L225 Difference]: With dead ends: 79 [2018-01-21 08:41:45,363 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 08:41:45,363 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-01-21 08:41:45,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 08:41:45,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 44. [2018-01-21 08:41:45,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-21 08:41:45,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2018-01-21 08:41:45,370 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 34 [2018-01-21 08:41:45,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:45,370 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2018-01-21 08:41:45,370 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 08:41:45,370 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2018-01-21 08:41:45,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-21 08:41:45,372 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:45,372 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:41:45,372 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:41:45,372 INFO L82 PathProgramCache]: Analyzing trace with hash -335791331, now seen corresponding path program 1 times [2018-01-21 08:41:45,373 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:45,373 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:45,374 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:45,374 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:45,374 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:45,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:45,389 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:45,423 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 08:41:45,424 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:45,424 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:41:45,425 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 40 with the following transitions: [2018-01-21 08:41:45,427 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [74], [76], [77], [78], [79], [80], [81] [2018-01-21 08:41:45,472 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 08:41:45,472 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 08:41:47,418 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 08:41:47,419 INFO L268 AbstractInterpreter]: Visited 37 different actions 91 times. Merged at 25 different actions 41 times. Never widened. Found 6 fixpoints after 3 different actions. Largest state had 23 variables. [2018-01-21 08:41:47,426 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 08:41:47,426 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:47,426 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 08:41:47,441 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:47,441 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:41:47,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:47,481 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:47,551 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 08:41:47,551 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:47,641 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 08:41:47,675 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:47,676 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 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 08:41:47,680 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:47,680 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:41:47,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:47,718 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:47,725 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 08:41:47,725 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:47,752 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 08:41:47,753 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:41:47,754 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 08:41:47,754 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:41:47,754 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 08:41:47,754 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 08:41:47,754 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 08:41:47,755 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 5 states. [2018-01-21 08:41:47,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:47,781 INFO L93 Difference]: Finished difference Result 67 states and 74 transitions. [2018-01-21 08:41:47,782 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 08:41:47,782 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 39 [2018-01-21 08:41:47,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:47,783 INFO L225 Difference]: With dead ends: 67 [2018-01-21 08:41:47,783 INFO L226 Difference]: Without dead ends: 55 [2018-01-21 08:41:47,783 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 153 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 08:41:47,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-01-21 08:41:47,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 50. [2018-01-21 08:41:47,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-01-21 08:41:47,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2018-01-21 08:41:47,790 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 39 [2018-01-21 08:41:47,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:47,790 INFO L432 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2018-01-21 08:41:47,790 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 08:41:47,790 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2018-01-21 08:41:47,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-21 08:41:47,791 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:47,791 INFO L322 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:41:47,791 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:41:47,792 INFO L82 PathProgramCache]: Analyzing trace with hash -291520001, now seen corresponding path program 2 times [2018-01-21 08:41:47,792 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:47,792 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:47,792 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:47,792 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:47,793 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:47,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:47,813 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:47,873 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 08:41:47,873 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:47,873 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:41:47,873 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:41:47,873 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:41:47,873 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:47,873 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 08:41:47,883 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:41:47,883 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:41:47,896 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:41:47,918 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:41:47,931 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:41:47,934 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:48,047 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 08:41:48,048 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:48,229 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 08:41:48,264 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 08:41:48,264 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5] total 11 [2018-01-21 08:41:48,264 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:41:48,264 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 08:41:48,265 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 08:41:48,265 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-01-21 08:41:48,265 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 6 states. [2018-01-21 08:41:48,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:48,336 INFO L93 Difference]: Finished difference Result 86 states and 93 transitions. [2018-01-21 08:41:48,337 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 08:41:48,337 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 52 [2018-01-21 08:41:48,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:48,338 INFO L225 Difference]: With dead ends: 86 [2018-01-21 08:41:48,338 INFO L226 Difference]: Without dead ends: 50 [2018-01-21 08:41:48,339 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2018-01-21 08:41:48,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-01-21 08:41:48,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2018-01-21 08:41:48,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-01-21 08:41:48,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2018-01-21 08:41:48,344 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 52 [2018-01-21 08:41:48,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:48,344 INFO L432 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2018-01-21 08:41:48,344 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 08:41:48,344 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2018-01-21 08:41:48,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-01-21 08:41:48,346 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:48,346 INFO L322 BasicCegarLoop]: trace histogram [4, 3, 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 08:41:48,346 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:41:48,346 INFO L82 PathProgramCache]: Analyzing trace with hash -41114337, now seen corresponding path program 3 times [2018-01-21 08:41:48,346 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:48,347 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:48,347 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:41:48,348 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:48,348 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:48,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:48,370 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:48,413 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 08:41:48,413 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:48,413 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:41:48,413 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:41:48,413 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:41:48,413 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:48,414 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 08:41:48,419 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:41:48,419 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:41:48,430 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:41:48,439 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:41:48,445 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:41:48,447 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:41:48,450 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:48,484 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-21 08:41:48,484 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:48,642 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-21 08:41:48,662 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:48,662 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:41:48,665 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:41:48,665 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:41:48,677 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:41:48,686 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:41:48,703 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:41:48,712 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:41:48,727 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:48,734 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 08:41:48,734 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:48,763 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 08:41:48,765 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:41:48,765 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7, 5, 5] total 15 [2018-01-21 08:41:48,765 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:41:48,765 INFO L409 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-01-21 08:41:48,766 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-01-21 08:41:48,766 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2018-01-21 08:41:48,766 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand 9 states. [2018-01-21 08:41:48,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:48,915 INFO L93 Difference]: Finished difference Result 107 states and 119 transitions. [2018-01-21 08:41:48,916 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 08:41:48,916 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 57 [2018-01-21 08:41:48,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:48,918 INFO L225 Difference]: With dead ends: 107 [2018-01-21 08:41:48,918 INFO L226 Difference]: Without dead ends: 95 [2018-01-21 08:41:48,919 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 217 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=75, Invalid=197, Unknown=0, NotChecked=0, Total=272 [2018-01-21 08:41:48,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-01-21 08:41:48,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 78. [2018-01-21 08:41:48,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-01-21 08:41:48,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 86 transitions. [2018-01-21 08:41:48,929 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 86 transitions. Word has length 57 [2018-01-21 08:41:48,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:48,930 INFO L432 AbstractCegarLoop]: Abstraction has 78 states and 86 transitions. [2018-01-21 08:41:48,930 INFO L433 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-01-21 08:41:48,930 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 86 transitions. [2018-01-21 08:41:48,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-01-21 08:41:48,932 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:48,932 INFO L322 BasicCegarLoop]: trace histogram [8, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:41:48,932 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:41:48,932 INFO L82 PathProgramCache]: Analyzing trace with hash 1962089693, now seen corresponding path program 4 times [2018-01-21 08:41:48,933 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:48,934 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:48,934 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:41:48,934 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:48,934 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:48,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:48,958 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:49,089 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 08:41:49,090 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:49,090 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:41:49,090 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:41:49,090 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:41:49,090 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:49,090 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:41:49,108 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:41:49,109 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:41:49,138 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:41:49,142 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:49,337 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 08:41:49,338 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:49,476 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 08:41:49,496 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:49,497 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:41:49,499 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:41:49,499 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:41:49,539 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:41:49,545 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:49,576 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 08:41:49,576 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:49,793 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 08:41:49,795 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:41:49,795 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 9, 9, 9] total 16 [2018-01-21 08:41:49,795 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:41:49,796 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-21 08:41:49,796 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-21 08:41:49,796 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2018-01-21 08:41:49,796 INFO L87 Difference]: Start difference. First operand 78 states and 86 transitions. Second operand 13 states. [2018-01-21 08:41:50,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:50,004 INFO L93 Difference]: Finished difference Result 200 states and 228 transitions. [2018-01-21 08:41:50,004 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 08:41:50,004 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 85 [2018-01-21 08:41:50,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:50,007 INFO L225 Difference]: With dead ends: 200 [2018-01-21 08:41:50,007 INFO L226 Difference]: Without dead ends: 149 [2018-01-21 08:41:50,008 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 320 SyntacticMatches, 10 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=102, Invalid=360, Unknown=0, NotChecked=0, Total=462 [2018-01-21 08:41:50,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-01-21 08:41:50,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 106. [2018-01-21 08:41:50,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-01-21 08:41:50,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 116 transitions. [2018-01-21 08:41:50,022 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 116 transitions. Word has length 85 [2018-01-21 08:41:50,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:50,023 INFO L432 AbstractCegarLoop]: Abstraction has 106 states and 116 transitions. [2018-01-21 08:41:50,023 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-21 08:41:50,023 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 116 transitions. [2018-01-21 08:41:50,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-01-21 08:41:50,025 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:50,025 INFO L322 BasicCegarLoop]: trace histogram [12, 8, 8, 8, 8, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:41:50,026 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:41:50,026 INFO L82 PathProgramCache]: Analyzing trace with hash -1278120925, now seen corresponding path program 5 times [2018-01-21 08:41:50,026 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:50,027 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:50,027 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:41:50,027 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:50,027 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:50,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:50,051 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:50,155 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2018-01-21 08:41:50,155 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:50,155 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:41:50,155 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:41:50,155 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:41:50,156 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:50,156 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:41:50,166 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:41:50,167 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:41:50,177 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:41:50,182 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:41:50,193 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:41:50,202 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:41:50,206 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:50,305 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 147 proven. 18 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2018-01-21 08:41:50,305 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:50,491 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 33 proven. 128 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2018-01-21 08:41:50,512 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:50,513 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:41:50,516 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:41:50,517 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:41:50,527 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:41:50,535 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:41:50,552 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:41:50,562 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:41:50,566 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:50,586 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 147 proven. 18 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2018-01-21 08:41:50,586 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:50,731 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 33 proven. 128 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2018-01-21 08:41:50,732 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:41:50,733 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9, 9, 9] total 17 [2018-01-21 08:41:50,733 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:41:50,733 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 08:41:50,733 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 08:41:50,733 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2018-01-21 08:41:50,734 INFO L87 Difference]: Start difference. First operand 106 states and 116 transitions. Second operand 14 states. [2018-01-21 08:41:50,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:50,939 INFO L93 Difference]: Finished difference Result 180 states and 196 transitions. [2018-01-21 08:41:50,940 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 08:41:50,940 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 113 [2018-01-21 08:41:50,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:50,941 INFO L225 Difference]: With dead ends: 180 [2018-01-21 08:41:50,941 INFO L226 Difference]: Without dead ends: 121 [2018-01-21 08:41:50,942 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 434 SyntacticMatches, 12 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=142, Invalid=560, Unknown=0, NotChecked=0, Total=702 [2018-01-21 08:41:50,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-01-21 08:41:50,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 105. [2018-01-21 08:41:50,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-01-21 08:41:50,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 114 transitions. [2018-01-21 08:41:50,951 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 114 transitions. Word has length 113 [2018-01-21 08:41:50,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:50,951 INFO L432 AbstractCegarLoop]: Abstraction has 105 states and 114 transitions. [2018-01-21 08:41:50,951 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 08:41:50,951 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 114 transitions. [2018-01-21 08:41:50,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-01-21 08:41:50,953 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:50,953 INFO L322 BasicCegarLoop]: trace histogram [17, 12, 12, 12, 12, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:41:50,953 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:41:50,954 INFO L82 PathProgramCache]: Analyzing trace with hash -1614733819, now seen corresponding path program 6 times [2018-01-21 08:41:50,954 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:50,954 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:50,955 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:41:50,955 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:50,955 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:50,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:50,981 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:51,085 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-21 08:41:51,085 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:51,085 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:41:51,085 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:41:51,085 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:41:51,086 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:51,086 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:41:51,091 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:41:51,091 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:41:51,105 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:41:51,108 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:41:51,112 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:41:51,114 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:41:51,119 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:41:51,124 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:41:51,130 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:41:51,138 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:41:51,148 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:41:51,150 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:41:51,156 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:51,238 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 179 proven. 89 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2018-01-21 08:41:51,238 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:51,554 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 179 proven. 89 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2018-01-21 08:41:51,574 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:51,574 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:41:51,577 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:41:51,577 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:41:51,592 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:41:51,601 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:41:51,617 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:41:51,630 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:41:51,651 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:41:51,689 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:41:51,815 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:41:52,360 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:41:53,363 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:41:53,404 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:41:53,411 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:53,432 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-21 08:41:53,432 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:53,512 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-21 08:41:53,514 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:41:53,515 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 10, 8, 8] total 25 [2018-01-21 08:41:53,515 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:41:53,515 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-21 08:41:53,516 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-21 08:41:53,516 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=438, Unknown=0, NotChecked=0, Total=600 [2018-01-21 08:41:53,516 INFO L87 Difference]: Start difference. First operand 105 states and 114 transitions. Second operand 13 states. [2018-01-21 08:41:53,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:53,693 INFO L93 Difference]: Finished difference Result 234 states and 263 transitions. [2018-01-21 08:41:53,694 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 08:41:53,694 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 146 [2018-01-21 08:41:53,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:53,696 INFO L225 Difference]: With dead ends: 234 [2018-01-21 08:41:53,696 INFO L226 Difference]: Without dead ends: 222 [2018-01-21 08:41:53,697 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 594 GetRequests, 566 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=602, Unknown=0, NotChecked=0, Total=812 [2018-01-21 08:41:53,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-01-21 08:41:53,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 146. [2018-01-21 08:41:53,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2018-01-21 08:41:53,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 163 transitions. [2018-01-21 08:41:53,709 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 163 transitions. Word has length 146 [2018-01-21 08:41:53,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:53,710 INFO L432 AbstractCegarLoop]: Abstraction has 146 states and 163 transitions. [2018-01-21 08:41:53,710 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-21 08:41:53,710 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 163 transitions. [2018-01-21 08:41:53,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-01-21 08:41:53,713 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:53,713 INFO L322 BasicCegarLoop]: trace histogram [24, 18, 18, 18, 18, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:41:53,713 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:41:53,713 INFO L82 PathProgramCache]: Analyzing trace with hash 1755240795, now seen corresponding path program 7 times [2018-01-21 08:41:53,714 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:53,714 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:53,715 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:41:53,715 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:53,715 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:53,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:53,747 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:53,897 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 08:41:53,898 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:53,898 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:41:53,898 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:41:53,898 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:41:53,898 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:53,898 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:41:53,903 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:53,904 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:41:53,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:53,940 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:54,035 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 761 proven. 38 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2018-01-21 08:41:54,035 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:54,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 383 proven. 139 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2018-01-21 08:41:54,290 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:54,290 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:41:54,294 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:54,294 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:41:54,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:54,383 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:54,407 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 761 proven. 38 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2018-01-21 08:41:54,407 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:54,548 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 383 proven. 139 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2018-01-21 08:41:54,550 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:41:54,550 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13, 13, 13, 13] total 25 [2018-01-21 08:41:54,550 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:41:54,551 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 08:41:54,551 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 08:41:54,551 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2018-01-21 08:41:54,551 INFO L87 Difference]: Start difference. First operand 146 states and 163 transitions. Second operand 20 states. [2018-01-21 08:41:54,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:54,849 INFO L93 Difference]: Finished difference Result 370 states and 422 transitions. [2018-01-21 08:41:54,849 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 08:41:54,850 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 189 [2018-01-21 08:41:54,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:54,852 INFO L225 Difference]: With dead ends: 370 [2018-01-21 08:41:54,852 INFO L226 Difference]: Without dead ends: 296 [2018-01-21 08:41:54,853 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 774 GetRequests, 726 SyntacticMatches, 14 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 402 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=244, Invalid=1016, Unknown=0, NotChecked=0, Total=1260 [2018-01-21 08:41:54,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2018-01-21 08:41:54,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 184. [2018-01-21 08:41:54,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-01-21 08:41:54,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 204 transitions. [2018-01-21 08:41:54,867 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 204 transitions. Word has length 189 [2018-01-21 08:41:54,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:54,868 INFO L432 AbstractCegarLoop]: Abstraction has 184 states and 204 transitions. [2018-01-21 08:41:54,868 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 08:41:54,868 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 204 transitions. [2018-01-21 08:41:54,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 233 [2018-01-21 08:41:54,871 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:54,872 INFO L322 BasicCegarLoop]: trace histogram [31, 24, 24, 24, 24, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:41:54,872 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:41:54,872 INFO L82 PathProgramCache]: Analyzing trace with hash 519411977, now seen corresponding path program 8 times [2018-01-21 08:41:54,872 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:54,873 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:54,873 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:54,873 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:54,873 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:54,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:54,904 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:55,069 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1842 trivial. 0 not checked. [2018-01-21 08:41:55,069 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:55,069 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:41:55,069 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:41:55,069 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:41:55,070 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:55,070 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:41:55,075 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:41:55,075 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:41:55,089 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:41:55,111 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:41:55,116 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:41:55,120 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:55,203 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 1178 proven. 21 refuted. 0 times theorem prover too weak. 804 trivial. 0 not checked. [2018-01-21 08:41:55,204 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:55,378 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 257 proven. 309 refuted. 0 times theorem prover too weak. 1437 trivial. 0 not checked. [2018-01-21 08:41:55,412 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:55,412 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:41:55,415 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:41:55,415 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:41:55,436 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:41:55,479 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:41:55,514 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:41:55,522 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:55,557 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 1178 proven. 21 refuted. 0 times theorem prover too weak. 804 trivial. 0 not checked. [2018-01-21 08:41:55,557 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:55,760 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 257 proven. 309 refuted. 0 times theorem prover too weak. 1437 trivial. 0 not checked. [2018-01-21 08:41:55,762 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:41:55,762 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11, 11, 11] total 23 [2018-01-21 08:41:55,762 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:41:55,762 INFO L409 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-01-21 08:41:55,762 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-01-21 08:41:55,763 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=402, Unknown=0, NotChecked=0, Total=506 [2018-01-21 08:41:55,763 INFO L87 Difference]: Start difference. First operand 184 states and 204 transitions. Second operand 19 states. [2018-01-21 08:41:55,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:55,994 INFO L93 Difference]: Finished difference Result 330 states and 362 transitions. [2018-01-21 08:41:55,994 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-21 08:41:55,994 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 232 [2018-01-21 08:41:55,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:55,996 INFO L225 Difference]: With dead ends: 330 [2018-01-21 08:41:55,996 INFO L226 Difference]: Without dead ends: 248 [2018-01-21 08:41:55,997 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 947 GetRequests, 903 SyntacticMatches, 12 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 338 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=225, Invalid=897, Unknown=0, NotChecked=0, Total=1122 [2018-01-21 08:41:55,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2018-01-21 08:41:56,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 183. [2018-01-21 08:41:56,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-01-21 08:41:56,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 202 transitions. [2018-01-21 08:41:56,010 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 202 transitions. Word has length 232 [2018-01-21 08:41:56,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:56,011 INFO L432 AbstractCegarLoop]: Abstraction has 183 states and 202 transitions. [2018-01-21 08:41:56,011 INFO L433 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-01-21 08:41:56,011 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 202 transitions. [2018-01-21 08:41:56,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-01-21 08:41:56,015 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:56,015 INFO L322 BasicCegarLoop]: trace histogram [38, 30, 30, 30, 30, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:41:56,016 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:41:56,016 INFO L82 PathProgramCache]: Analyzing trace with hash -881233501, now seen corresponding path program 9 times [2018-01-21 08:41:56,016 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:56,017 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:56,017 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:41:56,017 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:56,017 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:56,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:56,051 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:56,238 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-01-21 08:41:56,238 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:56,239 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:41:56,239 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:41:56,239 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:41:56,239 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:56,239 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:41:56,244 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:41:56,244 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:41:56,262 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:41:56,265 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:41:56,268 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:41:56,272 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:41:56,278 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:41:56,285 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:41:56,290 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:41:56,291 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:41:56,295 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:56,406 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-21 08:41:56,406 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:56,663 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-21 08:41:56,683 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:56,683 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:41:56,686 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:41:56,686 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:41:56,711 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:41:56,720 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:41:56,733 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:41:56,754 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:41:56,790 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:41:56,859 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:41:57,160 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:41:57,185 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:41:57,193 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:57,229 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-21 08:41:57,229 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:57,565 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-21 08:41:57,567 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:41:57,568 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 27 [2018-01-21 08:41:57,568 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:41:57,568 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 08:41:57,569 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 08:41:57,569 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=517, Unknown=0, NotChecked=0, Total=702 [2018-01-21 08:41:57,569 INFO L87 Difference]: Start difference. First operand 183 states and 202 transitions. Second operand 18 states. [2018-01-21 08:41:57,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:57,853 INFO L93 Difference]: Finished difference Result 420 states and 476 transitions. [2018-01-21 08:41:57,853 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-01-21 08:41:57,853 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 275 [2018-01-21 08:41:57,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:57,856 INFO L225 Difference]: With dead ends: 420 [2018-01-21 08:41:57,856 INFO L226 Difference]: Without dead ends: 408 [2018-01-21 08:41:57,857 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1115 GetRequests, 1082 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=281, Invalid=775, Unknown=0, NotChecked=0, Total=1056 [2018-01-21 08:41:57,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2018-01-21 08:41:57,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 234. [2018-01-21 08:41:57,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 234 states. [2018-01-21 08:41:57,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 264 transitions. [2018-01-21 08:41:57,877 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 264 transitions. Word has length 275 [2018-01-21 08:41:57,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:57,878 INFO L432 AbstractCegarLoop]: Abstraction has 234 states and 264 transitions. [2018-01-21 08:41:57,878 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 08:41:57,878 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 264 transitions. [2018-01-21 08:41:57,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2018-01-21 08:41:57,881 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:57,881 INFO L322 BasicCegarLoop]: trace histogram [48, 39, 39, 39, 39, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:41:57,881 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:41:57,881 INFO L82 PathProgramCache]: Analyzing trace with hash 2119777693, now seen corresponding path program 10 times [2018-01-21 08:41:57,881 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:57,882 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:57,883 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:41:57,883 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:57,883 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:57,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:57,923 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:58,227 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 4623 trivial. 0 not checked. [2018-01-21 08:41:58,227 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:58,227 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:41:58,227 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:41:58,227 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:41:58,228 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:58,228 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:41:58,235 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:41:58,235 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:41:58,319 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:41:58,326 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:58,583 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 3005 proven. 87 refuted. 0 times theorem prover too weak. 1801 trivial. 0 not checked. [2018-01-21 08:41:58,583 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:59,030 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1025 proven. 505 refuted. 0 times theorem prover too weak. 3363 trivial. 0 not checked. [2018-01-21 08:41:59,062 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:59,062 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:41:59,065 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:41:59,065 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:41:59,260 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:41:59,275 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:59,357 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 3005 proven. 87 refuted. 0 times theorem prover too weak. 1801 trivial. 0 not checked. [2018-01-21 08:41:59,357 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:59,616 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1025 proven. 505 refuted. 0 times theorem prover too weak. 3363 trivial. 0 not checked. [2018-01-21 08:41:59,618 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:41:59,619 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17, 17, 17, 17] total 34 [2018-01-21 08:41:59,619 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:41:59,619 INFO L409 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-01-21 08:41:59,619 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-01-21 08:41:59,620 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=913, Unknown=0, NotChecked=0, Total=1122 [2018-01-21 08:41:59,620 INFO L87 Difference]: Start difference. First operand 234 states and 264 transitions. Second operand 27 states. [2018-01-21 08:42:00,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:42:00,061 INFO L93 Difference]: Finished difference Result 592 states and 676 transitions. [2018-01-21 08:42:00,061 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-21 08:42:00,061 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 333 [2018-01-21 08:42:00,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:42:00,064 INFO L225 Difference]: With dead ends: 592 [2018-01-21 08:42:00,064 INFO L226 Difference]: Without dead ends: 495 [2018-01-21 08:42:00,065 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1358 GetRequests, 1292 SyntacticMatches, 18 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 812 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=445, Invalid=2005, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 08:42:00,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 495 states. [2018-01-21 08:42:00,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 495 to 282. [2018-01-21 08:42:00,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 282 states. [2018-01-21 08:42:00,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 316 transitions. [2018-01-21 08:42:00,084 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 316 transitions. Word has length 333 [2018-01-21 08:42:00,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:42:00,085 INFO L432 AbstractCegarLoop]: Abstraction has 282 states and 316 transitions. [2018-01-21 08:42:00,085 INFO L433 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-01-21 08:42:00,085 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 316 transitions. [2018-01-21 08:42:00,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 392 [2018-01-21 08:42:00,088 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:42:00,088 INFO L322 BasicCegarLoop]: trace histogram [58, 48, 48, 48, 48, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:42:00,088 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:42:00,089 INFO L82 PathProgramCache]: Analyzing trace with hash -1106394585, now seen corresponding path program 11 times [2018-01-21 08:42:00,089 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:42:00,090 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:00,090 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:42:00,090 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:00,090 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:42:00,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:42:00,133 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:42:00,463 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 0 proven. 335 refuted. 0 times theorem prover too weak. 6870 trivial. 0 not checked. [2018-01-21 08:42:00,463 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:00,464 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:42:00,464 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:42:00,464 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:42:00,464 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:00,464 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:42:00,469 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:42:00,469 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:42:00,493 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:00,506 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:00,523 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:00,540 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:00,549 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:00,558 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:00,573 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:00,586 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:42:00,591 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:42:00,838 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 4140 proven. 307 refuted. 0 times theorem prover too weak. 2758 trivial. 0 not checked. [2018-01-21 08:42:00,838 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:42:01,235 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 707 proven. 1488 refuted. 0 times theorem prover too weak. 5010 trivial. 0 not checked. [2018-01-21 08:42:01,256 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:01,256 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:42:01,259 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:42:01,259 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:42:01,285 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:01,294 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:01,313 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:01,350 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:01,397 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:01,924 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:02,092 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:02,127 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:42:02,136 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:42:02,200 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 4140 proven. 307 refuted. 0 times theorem prover too weak. 2758 trivial. 0 not checked. [2018-01-21 08:42:02,200 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:42:02,499 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 707 proven. 1488 refuted. 0 times theorem prover too weak. 5010 trivial. 0 not checked. [2018-01-21 08:42:02,501 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:42:02,501 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 17, 17, 17, 17] total 36 [2018-01-21 08:42:02,501 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:42:02,502 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-21 08:42:02,502 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-21 08:42:02,503 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=1062, Unknown=0, NotChecked=0, Total=1260 [2018-01-21 08:42:02,503 INFO L87 Difference]: Start difference. First operand 282 states and 316 transitions. Second operand 28 states. [2018-01-21 08:42:03,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:42:03,243 INFO L93 Difference]: Finished difference Result 640 states and 719 transitions. [2018-01-21 08:42:03,243 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-21 08:42:03,243 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 391 [2018-01-21 08:42:03,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:42:03,246 INFO L225 Difference]: With dead ends: 640 [2018-01-21 08:42:03,246 INFO L226 Difference]: Without dead ends: 345 [2018-01-21 08:42:03,249 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1601 GetRequests, 1523 SyntacticMatches, 18 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=623, Invalid=3159, Unknown=0, NotChecked=0, Total=3782 [2018-01-21 08:42:03,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 345 states. [2018-01-21 08:42:03,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 345 to 281. [2018-01-21 08:42:03,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 281 states. [2018-01-21 08:42:03,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 307 transitions. [2018-01-21 08:42:03,272 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 307 transitions. Word has length 391 [2018-01-21 08:42:03,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:42:03,273 INFO L432 AbstractCegarLoop]: Abstraction has 281 states and 307 transitions. [2018-01-21 08:42:03,273 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-21 08:42:03,273 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 307 transitions. [2018-01-21 08:42:03,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 445 [2018-01-21 08:42:03,276 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:42:03,277 INFO L322 BasicCegarLoop]: trace histogram [67, 56, 56, 56, 56, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:42:03,277 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:42:03,277 INFO L82 PathProgramCache]: Analyzing trace with hash -785380599, now seen corresponding path program 12 times [2018-01-21 08:42:03,277 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:42:03,278 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:03,278 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:42:03,278 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:03,278 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:42:03,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:42:03,321 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:42:03,725 INFO L134 CoverageAnalysis]: Checked inductivity of 9669 backedges. 0 proven. 407 refuted. 0 times theorem prover too weak. 9262 trivial. 0 not checked. [2018-01-21 08:42:03,725 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:03,725 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:42:03,725 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:42:03,725 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:42:03,725 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:03,725 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:42:03,739 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:42:03,739 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:42:03,767 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:03,783 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:03,799 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:03,814 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:03,830 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:03,848 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:03,865 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:03,883 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:03,901 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:03,920 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:03,949 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:03,963 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:03,991 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:04,008 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:04,058 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:04,096 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:04,146 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:04,148 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:42:04,155 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:42:04,340 INFO L134 CoverageAnalysis]: Checked inductivity of 9669 backedges. 2065 proven. 119 refuted. 0 times theorem prover too weak. 7485 trivial. 0 not checked. [2018-01-21 08:42:04,340 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:42:04,787 INFO L134 CoverageAnalysis]: Checked inductivity of 9669 backedges. 2065 proven. 119 refuted. 0 times theorem prover too weak. 7485 trivial. 0 not checked. [2018-01-21 08:42:04,808 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:04,808 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:42:04,810 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:42:04,811 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:42:04,840 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:04,851 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:04,874 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:04,912 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:04,993 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:11,223 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:12,640 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:17,601 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:29,652 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:41,735 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown