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_smtcomp.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_true-valid-memsafety.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 10:35:18,999 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 10:35:19,001 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 10:35:19,016 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 10:35:19,017 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 10:35:19,018 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 10:35:19,019 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 10:35:19,020 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 10:35:19,022 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 10:35:19,022 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 10:35:19,023 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 10:35:19,023 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 10:35:19,024 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 10:35:19,025 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 10:35:19,026 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 10:35:19,028 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 10:35:19,030 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 10:35:19,032 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 10:35:19,034 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 10:35:19,035 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 10:35:19,037 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 10:35:19,042 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 10:35:19,043 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 10:35:19,043 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_smtcomp.epf [2018-01-21 10:35:19,053 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 10:35:19,053 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 10:35:19,054 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 10:35:19,054 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 10:35:19,054 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 10:35:19,055 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 10:35:19,055 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-21 10:35:19,055 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 10:35:19,056 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 10:35:19,056 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 10:35:19,056 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 10:35:19,056 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 10:35:19,056 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 10:35:19,056 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 10:35:19,057 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 10:35:19,057 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 10:35:19,057 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 10:35:19,057 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 10:35:19,057 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 10:35:19,058 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 10:35:19,058 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 10:35:19,058 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 10:35:19,058 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 10:35:19,058 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 10:35:19,059 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 10:35:19,059 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 10:35:19,059 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 10:35:19,059 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 10:35:19,059 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 10:35:19,060 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 10:35:19,060 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 10:35:19,060 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 10:35:19,060 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 10:35:19,060 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 10:35:19,060 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 10:35:19,061 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 10:35:19,061 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 10:35:19,062 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 10:35:19,062 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 10:35:19,096 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 10:35:19,109 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 10:35:19,113 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 10:35:19,115 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 10:35:19,115 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 10:35:19,116 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_true-valid-memsafety.c [2018-01-21 10:35:19,243 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 10:35:19,247 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 10:35:19,248 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 10:35:19,248 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 10:35:19,253 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 10:35:19,254 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:35:19" (1/1) ... [2018-01-21 10:35:19,257 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@295cd51e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:19, skipping insertion in model container [2018-01-21 10:35:19,257 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:35:19" (1/1) ... [2018-01-21 10:35:19,271 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:35:19,285 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:35:19,395 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:35:19,412 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:35:19,418 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:19 WrapperNode [2018-01-21 10:35:19,418 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 10:35:19,418 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 10:35:19,419 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 10:35:19,419 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 10:35:19,429 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:19" (1/1) ... [2018-01-21 10:35:19,430 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:19" (1/1) ... [2018-01-21 10:35:19,437 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:19" (1/1) ... [2018-01-21 10:35:19,438 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:19" (1/1) ... [2018-01-21 10:35:19,441 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:19" (1/1) ... [2018-01-21 10:35:19,445 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:19" (1/1) ... [2018-01-21 10:35:19,446 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:19" (1/1) ... [2018-01-21 10:35:19,448 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 10:35:19,449 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 10:35:19,449 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 10:35:19,449 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 10:35:19,450 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:19" (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 10:35:19,493 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 10:35:19,493 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 10:35:19,493 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 10:35:19,494 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 10:35:19,494 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 10:35:19,494 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 10:35:19,494 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 10:35:19,494 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 10:35:19,494 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 10:35:19,494 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 10:35:19,495 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 10:35:19,495 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 10:35:19,495 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 10:35:19,648 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 10:35:19,649 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:35:19 BoogieIcfgContainer [2018-01-21 10:35:19,649 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 10:35:19,650 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 10:35:19,650 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 10:35:19,652 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 10:35:19,653 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 10:35:19" (1/3) ... [2018-01-21 10:35:19,654 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47d9f10d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:35:19, skipping insertion in model container [2018-01-21 10:35:19,654 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:35:19" (2/3) ... [2018-01-21 10:35:19,654 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47d9f10d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:35:19, skipping insertion in model container [2018-01-21 10:35:19,655 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:35:19" (3/3) ... [2018-01-21 10:35:19,657 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength_true-valid-memsafety.c [2018-01-21 10:35:19,665 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 10:35:19,673 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 10:35:19,719 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:35:19,719 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:35:19,719 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:35:19,720 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:35:19,720 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:35:19,720 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:35:19,720 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:35:19,720 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 10:35:19,721 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:35:19,742 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 10:35:19,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 10:35:19,748 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:19,750 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 10:35:19,750 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 10:35:19,755 INFO L82 PathProgramCache]: Analyzing trace with hash 103790, now seen corresponding path program 1 times [2018-01-21 10:35:19,758 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:19,814 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:19,814 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:19,814 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:19,815 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:19,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:35:19,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:35:19,872 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 10:35:19,877 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 10:35:19,883 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:35:19,884 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:35:19,884 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:35:19,884 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:35:19,884 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:35:19,884 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:35:19,885 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:35:19,885 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 10:35:19,885 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:35:19,887 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 10:35:19,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 10:35:19,888 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:19,889 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:19,889 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 10:35:19,889 INFO L82 PathProgramCache]: Analyzing trace with hash -125735921, now seen corresponding path program 1 times [2018-01-21 10:35:19,889 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:19,890 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:19,891 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:19,891 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:19,891 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:19,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:19,917 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:19,949 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 10:35:19,950 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:35:19,951 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:35:19,951 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:35:19,952 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:35:19,963 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:35:19,963 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:35:19,965 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-01-21 10:35:19,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:19,988 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-01-21 10:35:19,988 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:35:19,989 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 10:35:19,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:19,995 INFO L225 Difference]: With dead ends: 78 [2018-01-21 10:35:19,995 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 10:35:19,999 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 10:35:20,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 10:35:20,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 10:35:20,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 10:35:20,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 10:35:20,087 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 10:35:20,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:20,087 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 10:35:20,087 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:35:20,087 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 10:35:20,087 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 10:35:20,090 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:35:20,091 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:35:20,091 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:35:20,091 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:35:20,091 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:35:20,091 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:35:20,091 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:35:20,091 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 10:35:20,091 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:35:20,094 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 10:35:20,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 10:35:20,095 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:20,095 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 10:35:20,095 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:20,096 INFO L82 PathProgramCache]: Analyzing trace with hash -1491711838, now seen corresponding path program 1 times [2018-01-21 10:35:20,096 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:20,097 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:20,097 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:20,097 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:20,097 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:20,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:20,107 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:20,122 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 10:35:20,122 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:35:20,122 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:35:20,122 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:35:20,123 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:35:20,123 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:35:20,123 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:35:20,123 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-01-21 10:35:20,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:20,130 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-01-21 10:35:20,130 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:35:20,130 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 10:35:20,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:20,132 INFO L225 Difference]: With dead ends: 78 [2018-01-21 10:35:20,133 INFO L226 Difference]: Without dead ends: 40 [2018-01-21 10:35:20,133 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 10:35:20,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-01-21 10:35:20,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-01-21 10:35:20,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-01-21 10:35:20,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2018-01-21 10:35:20,147 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 17 [2018-01-21 10:35:20,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:20,147 INFO L432 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2018-01-21 10:35:20,147 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:35:20,147 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2018-01-21 10:35:20,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 10:35:20,148 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:20,148 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 10:35:20,148 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:20,149 INFO L82 PathProgramCache]: Analyzing trace with hash -1603848178, now seen corresponding path program 1 times [2018-01-21 10:35:20,149 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:20,150 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:20,150 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:20,150 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:20,150 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:20,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:20,162 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:20,196 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 10:35:20,196 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:35:20,196 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 10:35:20,196 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:35:20,197 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 10:35:20,197 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 10:35:20,198 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 10:35:20,198 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 3 states. [2018-01-21 10:35:20,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:20,258 INFO L93 Difference]: Finished difference Result 73 states and 81 transitions. [2018-01-21 10:35:20,258 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 10:35:20,258 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 10:35:20,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:20,262 INFO L225 Difference]: With dead ends: 73 [2018-01-21 10:35:20,263 INFO L226 Difference]: Without dead ends: 57 [2018-01-21 10:35:20,264 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 10:35:20,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-01-21 10:35:20,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 44. [2018-01-21 10:35:20,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-21 10:35:20,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2018-01-21 10:35:20,275 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 19 [2018-01-21 10:35:20,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:20,276 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2018-01-21 10:35:20,276 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 10:35:20,276 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2018-01-21 10:35:20,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 10:35:20,277 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:20,277 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 10:35:20,277 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:20,278 INFO L82 PathProgramCache]: Analyzing trace with hash -428436962, now seen corresponding path program 1 times [2018-01-21 10:35:20,278 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:20,279 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:20,279 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:20,279 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:20,279 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:20,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:20,296 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:20,354 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:35:20,354 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:20,354 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:20,355 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 35 with the following transitions: [2018-01-21 10:35:20,357 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [75], [77], [78], [79], [80], [81], [82] [2018-01-21 10:35:20,402 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 10:35:20,402 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 10:35:21,003 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 10:35:21,005 INFO L268 AbstractInterpreter]: Visited 33 different actions 57 times. Merged at 17 different actions 17 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 21 variables. [2018-01-21 10:35:21,019 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 10:35:21,019 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:21,019 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 10:35:21,033 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:21,033 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:35:21,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:21,073 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:21,149 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:35:21,149 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:21,282 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:35:21,307 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:21,307 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 10:35:21,324 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:21,324 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:35:21,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:21,361 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:21,367 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:35:21,367 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:21,449 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:35:21,450 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:21,451 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 10:35:21,451 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:21,451 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 10:35:21,451 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 10:35:21,452 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 10:35:21,452 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand 5 states. [2018-01-21 10:35:21,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:21,577 INFO L93 Difference]: Finished difference Result 92 states and 102 transitions. [2018-01-21 10:35:21,577 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 10:35:21,577 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 34 [2018-01-21 10:35:21,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:21,579 INFO L225 Difference]: With dead ends: 92 [2018-01-21 10:35:21,579 INFO L226 Difference]: Without dead ends: 74 [2018-01-21 10:35:21,579 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 10:35:21,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-01-21 10:35:21,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 56. [2018-01-21 10:35:21,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-01-21 10:35:21,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 61 transitions. [2018-01-21 10:35:21,585 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 61 transitions. Word has length 34 [2018-01-21 10:35:21,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:21,585 INFO L432 AbstractCegarLoop]: Abstraction has 56 states and 61 transitions. [2018-01-21 10:35:21,586 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 10:35:21,586 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 61 transitions. [2018-01-21 10:35:21,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-21 10:35:21,587 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:21,587 INFO L322 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:21,587 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:21,588 INFO L82 PathProgramCache]: Analyzing trace with hash 284082524, now seen corresponding path program 2 times [2018-01-21 10:35:21,588 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:21,588 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:21,589 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:21,589 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:21,589 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:21,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:21,602 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:21,655 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-21 10:35:21,656 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:21,656 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:21,656 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:21,656 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:21,656 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:21,656 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 10:35:21,665 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:35:21,665 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:35:21,684 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:21,696 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:21,698 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:21,701 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:21,773 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-21 10:35:21,774 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:21,893 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-21 10:35:21,913 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 10:35:21,913 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5] total 10 [2018-01-21 10:35:21,913 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:35:21,914 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 10:35:21,914 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 10:35:21,914 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2018-01-21 10:35:21,915 INFO L87 Difference]: Start difference. First operand 56 states and 61 transitions. Second operand 6 states. [2018-01-21 10:35:22,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:22,049 INFO L93 Difference]: Finished difference Result 108 states and 119 transitions. [2018-01-21 10:35:22,049 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 10:35:22,049 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 47 [2018-01-21 10:35:22,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:22,051 INFO L225 Difference]: With dead ends: 108 [2018-01-21 10:35:22,051 INFO L226 Difference]: Without dead ends: 69 [2018-01-21 10:35:22,052 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 86 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-01-21 10:35:22,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-01-21 10:35:22,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 61. [2018-01-21 10:35:22,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-01-21 10:35:22,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2018-01-21 10:35:22,060 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 47 [2018-01-21 10:35:22,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:22,060 INFO L432 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2018-01-21 10:35:22,061 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 10:35:22,061 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2018-01-21 10:35:22,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-21 10:35:22,062 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:22,063 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 10:35:22,063 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:22,063 INFO L82 PathProgramCache]: Analyzing trace with hash -1139762048, now seen corresponding path program 1 times [2018-01-21 10:35:22,063 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:22,064 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:22,065 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:35:22,065 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:22,065 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:22,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:22,085 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:22,158 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 10:35:22,159 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:22,159 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:22,159 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 53 with the following transitions: [2018-01-21 10:35:22,159 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [75], [77], [78], [79], [80], [81], [82] [2018-01-21 10:35:22,161 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 10:35:22,161 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 10:35:22,542 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 10:35:22,564 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 10:35:22,572 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 10:35:22,572 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:22,572 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 10:35:22,588 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:22,588 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:35:22,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:22,618 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:22,644 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 10:35:22,645 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:22,783 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 10:35:22,818 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:22,818 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 10:35:22,824 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:22,825 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:35:22,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:22,872 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:22,882 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 10:35:22,882 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:22,927 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 10:35:22,929 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:22,930 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 9 [2018-01-21 10:35:22,930 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:22,930 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 10:35:22,931 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 10:35:22,931 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 10:35:22,931 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand 6 states. [2018-01-21 10:35:23,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:23,020 INFO L93 Difference]: Finished difference Result 119 states and 133 transitions. [2018-01-21 10:35:23,020 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 10:35:23,020 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 52 [2018-01-21 10:35:23,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:23,021 INFO L225 Difference]: With dead ends: 119 [2018-01-21 10:35:23,021 INFO L226 Difference]: Without dead ends: 96 [2018-01-21 10:35:23,022 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 204 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 10:35:23,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-01-21 10:35:23,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 73. [2018-01-21 10:35:23,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-01-21 10:35:23,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 81 transitions. [2018-01-21 10:35:23,031 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 81 transitions. Word has length 52 [2018-01-21 10:35:23,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:23,032 INFO L432 AbstractCegarLoop]: Abstraction has 73 states and 81 transitions. [2018-01-21 10:35:23,032 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 10:35:23,032 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 81 transitions. [2018-01-21 10:35:23,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-01-21 10:35:23,033 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:23,034 INFO L322 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:23,034 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:23,034 INFO L82 PathProgramCache]: Analyzing trace with hash -2110418334, now seen corresponding path program 2 times [2018-01-21 10:35:23,034 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:23,035 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:23,035 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:23,036 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:23,036 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:23,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:23,061 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:23,148 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 10:35:23,148 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:23,148 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:23,149 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:23,149 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:23,149 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:23,149 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 10:35:23,155 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:35:23,155 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:35:23,168 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:23,183 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:23,186 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:23,190 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:23,279 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 48 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-21 10:35:23,279 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:23,458 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 48 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-21 10:35:23,480 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:23,480 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 10:35:23,483 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:35:23,483 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:35:23,495 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:23,517 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:23,533 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:23,539 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:23,563 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 10:35:23,563 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:23,625 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 10:35:23,627 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:23,627 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8, 6, 6] total 19 [2018-01-21 10:35:23,627 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:23,628 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-21 10:35:23,628 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-21 10:35:23,628 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2018-01-21 10:35:23,628 INFO L87 Difference]: Start difference. First operand 73 states and 81 transitions. Second operand 12 states. [2018-01-21 10:35:23,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:23,872 INFO L93 Difference]: Finished difference Result 192 states and 218 transitions. [2018-01-21 10:35:23,872 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 10:35:23,873 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 70 [2018-01-21 10:35:23,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:23,874 INFO L225 Difference]: With dead ends: 192 [2018-01-21 10:35:23,874 INFO L226 Difference]: Without dead ends: 143 [2018-01-21 10:35:23,875 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 262 SyntacticMatches, 5 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=129, Invalid=423, Unknown=0, NotChecked=0, Total=552 [2018-01-21 10:35:23,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2018-01-21 10:35:23,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 101. [2018-01-21 10:35:23,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-01-21 10:35:23,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 113 transitions. [2018-01-21 10:35:23,886 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 113 transitions. Word has length 70 [2018-01-21 10:35:23,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:23,887 INFO L432 AbstractCegarLoop]: Abstraction has 101 states and 113 transitions. [2018-01-21 10:35:23,887 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-21 10:35:23,887 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 113 transitions. [2018-01-21 10:35:23,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-01-21 10:35:23,889 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:23,889 INFO L322 BasicCegarLoop]: trace histogram [9, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:23,889 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:23,889 INFO L82 PathProgramCache]: Analyzing trace with hash 1934895936, now seen corresponding path program 3 times [2018-01-21 10:35:23,890 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:23,890 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:23,891 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:35:23,891 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:23,891 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:23,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:23,918 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:24,046 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-01-21 10:35:24,047 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:24,047 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:24,047 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:24,047 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:24,047 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:24,047 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 10:35:24,052 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:35:24,052 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:35:24,063 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:24,067 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:24,071 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:24,075 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:24,076 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:24,079 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:24,113 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 83 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-01-21 10:35:24,113 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:24,239 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 83 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-01-21 10:35:24,260 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:24,260 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 10:35:24,263 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:35:24,263 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:35:24,275 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:24,284 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:24,299 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:24,324 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:24,337 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:24,342 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:24,351 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 83 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-01-21 10:35:24,352 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:24,439 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 83 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-01-21 10:35:24,441 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:24,441 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8, 8, 8] total 17 [2018-01-21 10:35:24,441 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:24,442 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 10:35:24,442 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 10:35:24,442 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-01-21 10:35:24,443 INFO L87 Difference]: Start difference. First operand 101 states and 113 transitions. Second operand 11 states. [2018-01-21 10:35:24,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:24,639 INFO L93 Difference]: Finished difference Result 239 states and 273 transitions. [2018-01-21 10:35:24,639 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 10:35:24,639 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 98 [2018-01-21 10:35:24,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:24,641 INFO L225 Difference]: With dead ends: 239 [2018-01-21 10:35:24,641 INFO L226 Difference]: Without dead ends: 206 [2018-01-21 10:35:24,642 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 380 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=276, Unknown=0, NotChecked=0, Total=380 [2018-01-21 10:35:24,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2018-01-21 10:35:24,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 142. [2018-01-21 10:35:24,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-01-21 10:35:24,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 162 transitions. [2018-01-21 10:35:24,659 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 162 transitions. Word has length 98 [2018-01-21 10:35:24,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:24,660 INFO L432 AbstractCegarLoop]: Abstraction has 142 states and 162 transitions. [2018-01-21 10:35:24,660 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 10:35:24,660 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 162 transitions. [2018-01-21 10:35:24,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-01-21 10:35:24,662 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:24,662 INFO L322 BasicCegarLoop]: trace histogram [14, 9, 9, 9, 9, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:24,662 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:24,663 INFO L82 PathProgramCache]: Analyzing trace with hash -883540994, now seen corresponding path program 4 times [2018-01-21 10:35:24,663 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:24,663 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:24,663 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:35:24,663 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:24,664 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:24,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:24,695 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:24,882 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2018-01-21 10:35:24,882 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:24,882 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:24,882 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:24,882 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:24,883 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:24,883 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 10:35:24,891 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:35:24,891 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:35:24,918 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:24,920 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:25,036 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 226 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 10:35:25,036 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:25,204 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 226 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 10:35:25,225 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:25,225 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 10:35:25,228 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:35:25,228 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:35:25,279 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:25,285 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:25,304 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 226 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 10:35:25,304 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:25,436 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 226 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 10:35:25,438 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:25,438 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 12, 12, 12, 12] total 22 [2018-01-21 10:35:25,438 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:25,439 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 10:35:25,439 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 10:35:25,439 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2018-01-21 10:35:25,439 INFO L87 Difference]: Start difference. First operand 142 states and 162 transitions. Second operand 18 states. [2018-01-21 10:35:25,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:25,903 INFO L93 Difference]: Finished difference Result 371 states and 427 transitions. [2018-01-21 10:35:25,903 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 10:35:25,903 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 131 [2018-01-21 10:35:25,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:25,906 INFO L225 Difference]: With dead ends: 371 [2018-01-21 10:35:25,906 INFO L226 Difference]: Without dead ends: 283 [2018-01-21 10:35:25,907 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 539 GetRequests, 496 SyntacticMatches, 14 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=182, Invalid=748, Unknown=0, NotChecked=0, Total=930 [2018-01-21 10:35:25,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2018-01-21 10:35:25,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 180. [2018-01-21 10:35:25,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-01-21 10:35:25,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 205 transitions. [2018-01-21 10:35:25,927 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 205 transitions. Word has length 131 [2018-01-21 10:35:25,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:25,927 INFO L432 AbstractCegarLoop]: Abstraction has 180 states and 205 transitions. [2018-01-21 10:35:25,927 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 10:35:25,928 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 205 transitions. [2018-01-21 10:35:25,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-01-21 10:35:25,930 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:25,931 INFO L322 BasicCegarLoop]: trace histogram [19, 13, 13, 13, 13, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:25,931 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:25,931 INFO L82 PathProgramCache]: Analyzing trace with hash 1207261824, now seen corresponding path program 5 times [2018-01-21 10:35:25,931 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:25,932 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:25,932 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:35:25,932 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:25,933 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:25,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:25,967 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:26,132 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 636 trivial. 0 not checked. [2018-01-21 10:35:26,133 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:26,133 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:26,133 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:26,133 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:26,134 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:26,134 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 10:35:26,145 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:35:26,146 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:35:26,164 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:26,169 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:26,175 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:26,181 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:26,189 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:26,198 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:26,200 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:26,205 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:26,380 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 476 proven. 53 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2018-01-21 10:35:26,381 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:26,640 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 146 proven. 235 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2018-01-21 10:35:26,673 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:26,674 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 10:35:26,680 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:35:26,680 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:35:26,693 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:26,701 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:26,717 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:26,735 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:26,758 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:27,128 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:27,156 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:27,162 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:27,181 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 476 proven. 53 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2018-01-21 10:35:27,181 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:27,398 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 146 proven. 235 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2018-01-21 10:35:27,400 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:27,401 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11, 11, 11] total 22 [2018-01-21 10:35:27,401 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:27,401 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 10:35:27,401 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 10:35:27,401 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2018-01-21 10:35:27,402 INFO L87 Difference]: Start difference. First operand 180 states and 205 transitions. Second operand 18 states. [2018-01-21 10:35:27,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:27,828 INFO L93 Difference]: Finished difference Result 418 states and 475 transitions. [2018-01-21 10:35:27,829 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 10:35:27,829 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 164 [2018-01-21 10:35:27,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:27,830 INFO L225 Difference]: With dead ends: 418 [2018-01-21 10:35:27,831 INFO L226 Difference]: Without dead ends: 249 [2018-01-21 10:35:27,832 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 684 GetRequests, 635 SyntacticMatches, 14 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=242, Invalid=1090, Unknown=0, NotChecked=0, Total=1332 [2018-01-21 10:35:27,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2018-01-21 10:35:27,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 187. [2018-01-21 10:35:27,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-01-21 10:35:27,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 208 transitions. [2018-01-21 10:35:27,846 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 208 transitions. Word has length 164 [2018-01-21 10:35:27,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:27,846 INFO L432 AbstractCegarLoop]: Abstraction has 187 states and 208 transitions. [2018-01-21 10:35:27,846 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 10:35:27,847 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 208 transitions. [2018-01-21 10:35:27,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2018-01-21 10:35:27,849 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:27,850 INFO L322 BasicCegarLoop]: trace histogram [25, 18, 18, 18, 18, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:27,850 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:27,850 INFO L82 PathProgramCache]: Analyzing trace with hash -1562233122, now seen corresponding path program 6 times [2018-01-21 10:35:27,850 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:27,851 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:27,851 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:35:27,851 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:27,851 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:27,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:27,886 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:28,087 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 10:35:28,087 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:28,087 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:28,088 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:28,088 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:28,088 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:28,088 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 10:35:28,093 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:35:28,093 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:35:28,111 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:28,113 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:28,117 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:28,122 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:28,127 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:28,133 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:28,139 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:28,147 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:28,157 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:28,159 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:28,164 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:28,202 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 10:35:28,202 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:28,346 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 10:35:28,368 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:28,368 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 10:35:28,371 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:35:28,371 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:35:28,388 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:28,395 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:28,409 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:28,429 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:28,482 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:28,644 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:30,039 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:30,463 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:42,497 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:35:42,562 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:42,584 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:42,629 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 10:35:42,629 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:42,698 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 10:35:42,701 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:42,701 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 19 [2018-01-21 10:35:42,702 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:42,702 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 10:35:42,702 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 10:35:42,702 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-21 10:35:42,703 INFO L87 Difference]: Start difference. First operand 187 states and 208 transitions. Second operand 11 states. [2018-01-21 10:35:42,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:42,821 INFO L93 Difference]: Finished difference Result 295 states and 329 transitions. [2018-01-21 10:35:42,821 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-21 10:35:42,821 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 202 [2018-01-21 10:35:42,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:42,823 INFO L225 Difference]: With dead ends: 295 [2018-01-21 10:35:42,823 INFO L226 Difference]: Without dead ends: 247 [2018-01-21 10:35:42,823 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 816 GetRequests, 799 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-21 10:35:42,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-01-21 10:35:42,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 199. [2018-01-21 10:35:42,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2018-01-21 10:35:42,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 222 transitions. [2018-01-21 10:35:42,837 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 222 transitions. Word has length 202 [2018-01-21 10:35:42,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:42,837 INFO L432 AbstractCegarLoop]: Abstraction has 199 states and 222 transitions. [2018-01-21 10:35:42,837 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 10:35:42,838 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 222 transitions. [2018-01-21 10:35:42,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2018-01-21 10:35:42,840 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:42,841 INFO L322 BasicCegarLoop]: trace histogram [30, 22, 22, 22, 22, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:42,841 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:42,841 INFO L82 PathProgramCache]: Analyzing trace with hash 1505706396, now seen corresponding path program 7 times [2018-01-21 10:35:42,841 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:42,842 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:42,842 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:35:42,842 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:42,842 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:42,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:42,878 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:43,093 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 1675 trivial. 0 not checked. [2018-01-21 10:35:43,100 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:43,100 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:43,101 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:43,101 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:43,101 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:43,101 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 10:35:43,106 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:43,106 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:35:43,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:43,153 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:43,311 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 1262 proven. 38 refuted. 0 times theorem prover too weak. 587 trivial. 0 not checked. [2018-01-21 10:35:43,312 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:43,569 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 478 proven. 240 refuted. 0 times theorem prover too weak. 1169 trivial. 0 not checked. [2018-01-21 10:35:43,589 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:43,589 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 10:35:43,592 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:43,592 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:35:43,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:43,692 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:43,741 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 1262 proven. 38 refuted. 0 times theorem prover too weak. 587 trivial. 0 not checked. [2018-01-21 10:35:43,741 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:43,925 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 478 proven. 240 refuted. 0 times theorem prover too weak. 1169 trivial. 0 not checked. [2018-01-21 10:35:43,927 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:43,927 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 14, 14, 14] total 28 [2018-01-21 10:35:43,927 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:43,928 INFO L409 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-01-21 10:35:43,928 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-01-21 10:35:43,928 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=611, Unknown=0, NotChecked=0, Total=756 [2018-01-21 10:35:43,928 INFO L87 Difference]: Start difference. First operand 199 states and 222 transitions. Second operand 23 states. [2018-01-21 10:35:44,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:44,325 INFO L93 Difference]: Finished difference Result 498 states and 557 transitions. [2018-01-21 10:35:44,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-01-21 10:35:44,325 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 235 [2018-01-21 10:35:44,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:44,328 INFO L225 Difference]: With dead ends: 498 [2018-01-21 10:35:44,328 INFO L226 Difference]: Without dead ends: 390 [2018-01-21 10:35:44,329 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 962 GetRequests, 907 SyntacticMatches, 16 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=306, Invalid=1334, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 10:35:44,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2018-01-21 10:35:44,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 242. [2018-01-21 10:35:44,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2018-01-21 10:35:44,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 271 transitions. [2018-01-21 10:35:44,345 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 271 transitions. Word has length 235 [2018-01-21 10:35:44,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:44,345 INFO L432 AbstractCegarLoop]: Abstraction has 242 states and 271 transitions. [2018-01-21 10:35:44,345 INFO L433 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-01-21 10:35:44,345 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 271 transitions. [2018-01-21 10:35:44,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2018-01-21 10:35:44,348 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:44,348 INFO L322 BasicCegarLoop]: trace histogram [39, 30, 30, 30, 30, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:44,348 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:44,348 INFO L82 PathProgramCache]: Analyzing trace with hash 369611686, now seen corresponding path program 8 times [2018-01-21 10:35:44,349 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:44,349 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:44,349 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:35:44,350 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:44,350 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:44,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:44,389 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:44,695 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 2931 trivial. 0 not checked. [2018-01-21 10:35:44,696 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:44,696 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:44,696 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:44,696 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:44,696 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:44,696 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 10:35:44,704 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:35:44,705 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:35:44,731 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:44,777 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:44,787 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:44,795 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:44,998 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 2050 proven. 60 refuted. 0 times theorem prover too weak. 1091 trivial. 0 not checked. [2018-01-21 10:35:44,998 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:45,320 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 746 proven. 360 refuted. 0 times theorem prover too weak. 2095 trivial. 0 not checked. [2018-01-21 10:35:45,341 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:45,341 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 10:35:45,344 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:35:45,344 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:35:45,366 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:45,421 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:45,466 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:45,478 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:45,551 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 2050 proven. 60 refuted. 0 times theorem prover too weak. 1091 trivial. 0 not checked. [2018-01-21 10:35:45,551 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:45,916 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 746 proven. 360 refuted. 0 times theorem prover too weak. 2095 trivial. 0 not checked. [2018-01-21 10:35:45,918 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:45,918 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16, 16, 16, 16] total 32 [2018-01-21 10:35:45,919 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:45,919 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-21 10:35:45,919 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-21 10:35:45,919 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=807, Unknown=0, NotChecked=0, Total=992 [2018-01-21 10:35:45,920 INFO L87 Difference]: Start difference. First operand 242 states and 271 transitions. Second operand 26 states. [2018-01-21 10:35:46,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:46,642 INFO L93 Difference]: Finished difference Result 607 states and 679 transitions. [2018-01-21 10:35:46,642 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-01-21 10:35:46,642 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 288 [2018-01-21 10:35:46,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:46,645 INFO L225 Difference]: With dead ends: 607 [2018-01-21 10:35:46,645 INFO L226 Difference]: Without dead ends: 486 [2018-01-21 10:35:46,646 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1177 GetRequests, 1114 SyntacticMatches, 18 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 734 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=392, Invalid=1770, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 10:35:46,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 486 states. [2018-01-21 10:35:46,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 486 to 290. [2018-01-21 10:35:46,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 290 states. [2018-01-21 10:35:46,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 326 transitions. [2018-01-21 10:35:46,663 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 326 transitions. Word has length 288 [2018-01-21 10:35:46,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:46,663 INFO L432 AbstractCegarLoop]: Abstraction has 290 states and 326 transitions. [2018-01-21 10:35:46,663 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-21 10:35:46,663 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 326 transitions. [2018-01-21 10:35:46,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2018-01-21 10:35:46,665 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:46,665 INFO L322 BasicCegarLoop]: trace histogram [49, 39, 39, 39, 39, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:46,665 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:46,665 INFO L82 PathProgramCache]: Analyzing trace with hash -292281344, now seen corresponding path program 9 times [2018-01-21 10:35:46,666 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:46,666 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:46,666 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:35:46,667 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:46,667 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:46,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:46,697 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:46,971 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 0 proven. 335 refuted. 0 times theorem prover too weak. 4755 trivial. 0 not checked. [2018-01-21 10:35:46,971 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:46,971 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:46,971 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:46,971 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:46,971 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:46,972 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 10:35:46,978 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:35:46,978 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:35:46,999 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:47,002 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:47,005 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:47,009 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:47,015 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:47,021 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:47,028 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:47,036 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:47,038 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:47,042 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:47,310 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 1265 proven. 87 refuted. 0 times theorem prover too weak. 3738 trivial. 0 not checked. [2018-01-21 10:35:47,310 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:47,653 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 1265 proven. 87 refuted. 0 times theorem prover too weak. 3738 trivial. 0 not checked. [2018-01-21 10:35:47,674 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:47,674 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 10:35:47,678 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:35:47,678 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:35:47,712 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:47,726 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:47,745 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:47,768 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:47,805 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:47,875 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:48,214 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:49,210 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:35:49,260 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:49,269 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:49,327 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 1265 proven. 87 refuted. 0 times theorem prover too weak. 3738 trivial. 0 not checked. [2018-01-21 10:35:49,327 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:49,504 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 1265 proven. 87 refuted. 0 times theorem prover too weak. 3738 trivial. 0 not checked. [2018-01-21 10:35:49,507 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:49,507 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12, 12, 12] total 31 [2018-01-21 10:35:49,507 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:49,507 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 10:35:49,508 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 10:35:49,508 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=687, Unknown=0, NotChecked=0, Total=930 [2018-01-21 10:35:49,508 INFO L87 Difference]: Start difference. First operand 290 states and 326 transitions. Second operand 21 states. [2018-01-21 10:35:50,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:50,362 INFO L93 Difference]: Finished difference Result 697 states and 790 transitions. [2018-01-21 10:35:50,362 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-21 10:35:50,362 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 346 [2018-01-21 10:35:50,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:50,366 INFO L225 Difference]: With dead ends: 697 [2018-01-21 10:35:50,366 INFO L226 Difference]: Without dead ends: 634 [2018-01-21 10:35:50,367 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1402 GetRequests, 1364 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=369, Invalid=1037, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 10:35:50,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 634 states. [2018-01-21 10:35:50,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 634 to 351. [2018-01-21 10:35:50,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 351 states. [2018-01-21 10:35:50,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 400 transitions. [2018-01-21 10:35:50,385 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 400 transitions. Word has length 346 [2018-01-21 10:35:50,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:50,385 INFO L432 AbstractCegarLoop]: Abstraction has 351 states and 400 transitions. [2018-01-21 10:35:50,385 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 10:35:50,385 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 400 transitions. [2018-01-21 10:35:50,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2018-01-21 10:35:50,387 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:50,388 INFO L322 BasicCegarLoop]: trace histogram [60, 49, 49, 49, 49, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:50,388 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:50,388 INFO L82 PathProgramCache]: Analyzing trace with hash 1529949378, now seen corresponding path program 10 times [2018-01-21 10:35:50,388 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:50,389 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:50,389 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:35:50,389 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:50,389 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:50,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:50,421 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:51,108 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 0 proven. 407 refuted. 0 times theorem prover too weak. 7288 trivial. 0 not checked. [2018-01-21 10:35:51,109 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:51,109 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:51,109 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:51,109 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:51,109 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:51,109 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 10:35:51,114 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:35:51,114 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:35:51,190 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:51,197 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:51,450 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 4526 proven. 119 refuted. 0 times theorem prover too weak. 3050 trivial. 0 not checked. [2018-01-21 10:35:51,450 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:51,867 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 1576 proven. 675 refuted. 0 times theorem prover too weak. 5444 trivial. 0 not checked. [2018-01-21 10:35:51,887 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:51,887 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 10:35:51,890 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:35:51,890 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:35:52,051 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:52,063 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:52,148 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 4526 proven. 119 refuted. 0 times theorem prover too weak. 3050 trivial. 0 not checked. [2018-01-21 10:35:52,148 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:52,578 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 1576 proven. 675 refuted. 0 times theorem prover too weak. 5444 trivial. 0 not checked. [2018-01-21 10:35:52,580 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:35:52,580 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 20, 20, 20, 20] total 40 [2018-01-21 10:35:52,580 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:35:52,581 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 10:35:52,581 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 10:35:52,582 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=1280, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 10:35:52,582 INFO L87 Difference]: Start difference. First operand 351 states and 400 transitions. Second operand 32 states. [2018-01-21 10:35:53,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:35:53,347 INFO L93 Difference]: Finished difference Result 905 states and 1030 transitions. [2018-01-21 10:35:53,375 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-21 10:35:53,376 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 409 [2018-01-21 10:35:53,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:35:53,380 INFO L225 Difference]: With dead ends: 905 [2018-01-21 10:35:53,380 INFO L226 Difference]: Without dead ends: 744 [2018-01-21 10:35:53,383 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1667 GetRequests, 1588 SyntacticMatches, 22 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1189 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=597, Invalid=2825, Unknown=0, NotChecked=0, Total=3422 [2018-01-21 10:35:53,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 744 states. [2018-01-21 10:35:53,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 744 to 409. [2018-01-21 10:35:53,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 409 states. [2018-01-21 10:35:53,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 464 transitions. [2018-01-21 10:35:53,415 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 464 transitions. Word has length 409 [2018-01-21 10:35:53,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:35:53,416 INFO L432 AbstractCegarLoop]: Abstraction has 409 states and 464 transitions. [2018-01-21 10:35:53,416 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 10:35:53,416 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 464 transitions. [2018-01-21 10:35:53,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 473 [2018-01-21 10:35:53,420 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:35:53,421 INFO L322 BasicCegarLoop]: trace histogram [71, 59, 59, 59, 59, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:35:53,421 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:35:53,421 INFO L82 PathProgramCache]: Analyzing trace with hash 1199895744, now seen corresponding path program 11 times [2018-01-21 10:35:53,421 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:35:53,422 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:53,422 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:35:53,422 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:35:53,422 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:35:53,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:35:53,474 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:35:54,134 INFO L134 CoverageAnalysis]: Checked inductivity of 10853 backedges. 0 proven. 486 refuted. 0 times theorem prover too weak. 10367 trivial. 0 not checked. [2018-01-21 10:35:54,134 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:54,135 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:35:54,135 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:35:54,135 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:35:54,135 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:54,135 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:35:54,146 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:35:54,146 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:35:54,182 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:54,191 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:54,201 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:54,213 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:54,222 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:54,232 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:54,246 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:54,258 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:54,260 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:35:54,268 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:35:54,823 INFO L134 CoverageAnalysis]: Checked inductivity of 10853 backedges. 6406 proven. 313 refuted. 0 times theorem prover too weak. 4134 trivial. 0 not checked. [2018-01-21 10:35:54,823 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:35:55,373 INFO L134 CoverageAnalysis]: Checked inductivity of 10853 backedges. 1168 proven. 1655 refuted. 0 times theorem prover too weak. 8030 trivial. 0 not checked. [2018-01-21 10:35:55,404 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:35:55,405 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:35:55,409 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:35:55,410 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:35:55,445 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:55,461 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:55,497 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:35:55,625 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:36:07,663 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command Received shutdown request... [2018-01-21 10:36:19,716 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command Cannot interrupt operation gracefully because timeout expired. Forcing shutdown