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.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_false-valid-deref-read.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-20 23:46:14,220 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-20 23:46:14,222 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-20 23:46:14,236 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-20 23:46:14,236 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-20 23:46:14,237 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-20 23:46:14,238 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-20 23:46:14,240 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-20 23:46:14,242 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-20 23:46:14,243 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-20 23:46:14,244 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-20 23:46:14,244 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-20 23:46:14,245 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-20 23:46:14,246 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-20 23:46:14,247 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-20 23:46:14,250 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-20 23:46:14,253 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-20 23:46:14,255 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-20 23:46:14,256 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-20 23:46:14,258 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-20 23:46:14,261 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-20 23:46:14,261 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-20 23:46:14,261 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-20 23:46:14,262 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-20 23:46:14,263 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-20 23:46:14,265 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-20 23:46:14,265 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-20 23:46:14,266 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-20 23:46:14,266 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-20 23:46:14,266 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-20 23:46:14,267 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-20 23:46:14,267 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.epf [2018-01-20 23:46:14,277 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-20 23:46:14,278 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-20 23:46:14,278 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-20 23:46:14,279 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-20 23:46:14,279 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-20 23:46:14,279 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-20 23:46:14,279 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-20 23:46:14,280 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-20 23:46:14,280 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-20 23:46:14,280 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-20 23:46:14,280 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-20 23:46:14,281 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-20 23:46:14,281 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-20 23:46:14,281 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-20 23:46:14,281 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-20 23:46:14,281 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-20 23:46:14,282 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-20 23:46:14,282 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-20 23:46:14,282 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-20 23:46:14,282 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-20 23:46:14,282 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-20 23:46:14,282 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-20 23:46:14,283 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-20 23:46:14,283 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-20 23:46:14,283 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-20 23:46:14,283 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-20 23:46:14,283 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-20 23:46:14,284 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-20 23:46:14,284 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-20 23:46:14,284 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-20 23:46:14,284 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-20 23:46:14,284 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-20 23:46:14,284 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-20 23:46:14,285 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-20 23:46:14,285 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-20 23:46:14,285 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-20 23:46:14,286 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-20 23:46:14,286 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-20 23:46:14,322 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-20 23:46:14,335 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-20 23:46:14,338 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-20 23:46:14,339 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-20 23:46:14,339 INFO L276 PluginConnector]: CDTParser initialized [2018-01-20 23:46:14,340 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_false-valid-deref-read.c [2018-01-20 23:46:14,452 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-20 23:46:14,457 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-20 23:46:14,458 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-20 23:46:14,458 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-20 23:46:14,466 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-20 23:46:14,467 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:46:14" (1/1) ... [2018-01-20 23:46:14,470 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4e3b6f0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14, skipping insertion in model container [2018-01-20 23:46:14,471 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:46:14" (1/1) ... [2018-01-20 23:46:14,486 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:46:14,506 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:46:14,623 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:46:14,640 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:46:14,646 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14 WrapperNode [2018-01-20 23:46:14,646 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-20 23:46:14,647 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-20 23:46:14,647 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-20 23:46:14,648 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-20 23:46:14,664 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14" (1/1) ... [2018-01-20 23:46:14,664 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14" (1/1) ... [2018-01-20 23:46:14,674 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14" (1/1) ... [2018-01-20 23:46:14,674 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14" (1/1) ... [2018-01-20 23:46:14,677 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14" (1/1) ... [2018-01-20 23:46:14,681 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14" (1/1) ... [2018-01-20 23:46:14,682 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14" (1/1) ... [2018-01-20 23:46:14,683 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-20 23:46:14,684 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-20 23:46:14,684 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-20 23:46:14,684 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-20 23:46:14,685 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14" (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 [2018-01-20 23:46:14,730 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-20 23:46:14,730 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-20 23:46:14,730 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-20 23:46:14,730 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-20 23:46:14,730 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-20 23:46:14,731 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-20 23:46:14,731 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-20 23:46:14,731 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-20 23:46:14,731 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-20 23:46:14,731 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-20 23:46:14,731 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-20 23:46:14,731 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-20 23:46:14,731 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-20 23:46:14,903 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-20 23:46:14,904 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:46:14 BoogieIcfgContainer [2018-01-20 23:46:14,904 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-20 23:46:14,905 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-20 23:46:14,905 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-20 23:46:14,906 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-20 23:46:14,907 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.01 11:46:14" (1/3) ... [2018-01-20 23:46:14,908 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e799f78 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 11:46:14, skipping insertion in model container [2018-01-20 23:46:14,908 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14" (2/3) ... [2018-01-20 23:46:14,908 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e799f78 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 11:46:14, skipping insertion in model container [2018-01-20 23:46:14,908 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:46:14" (3/3) ... [2018-01-20 23:46:14,909 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength_false-valid-deref-read.c [2018-01-20 23:46:14,918 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-20 23:46:14,923 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-20 23:46:14,966 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:46:14,966 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:46:14,966 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:46:14,967 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:46:14,967 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:46:14,967 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:46:14,967 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:46:14,967 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-20 23:46:14,968 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:46:14,983 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states. [2018-01-20 23:46:14,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-20 23:46:14,988 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:14,989 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-20 23:46:14,989 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-20 23:46:14,995 INFO L82 PathProgramCache]: Analyzing trace with hash 102829, now seen corresponding path program 1 times [2018-01-20 23:46:14,998 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:15,043 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,043 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:15,043 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,043 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:15,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:46:15,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:46:15,093 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-20 23:46:15,098 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-20 23:46:15,104 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:46:15,104 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:46:15,104 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:46:15,104 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:46:15,104 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:46:15,104 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:46:15,104 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:46:15,104 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-20 23:46:15,105 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:46:15,106 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states. [2018-01-20 23:46:15,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-20 23:46:15,107 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:15,107 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:15,107 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-20 23:46:15,107 INFO L82 PathProgramCache]: Analyzing trace with hash 33657389, now seen corresponding path program 1 times [2018-01-20 23:46:15,107 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:15,108 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,109 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:15,109 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,109 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:15,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:15,135 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:15,166 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:46:15,168 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:46:15,168 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-20 23:46:15,168 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:46:15,170 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-20 23:46:15,180 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-20 23:46:15,180 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:46:15,182 INFO L87 Difference]: Start difference. First operand 43 states. Second operand 2 states. [2018-01-20 23:46:15,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:15,213 INFO L93 Difference]: Finished difference Result 76 states and 90 transitions. [2018-01-20 23:46:15,213 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-20 23:46:15,214 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-20 23:46:15,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:15,223 INFO L225 Difference]: With dead ends: 76 [2018-01-20 23:46:15,224 INFO L226 Difference]: Without dead ends: 0 [2018-01-20 23:46:15,227 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 [2018-01-20 23:46:15,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-20 23:46:15,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-20 23:46:15,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-20 23:46:15,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-20 23:46:15,326 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-20 23:46:15,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:15,327 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-20 23:46:15,327 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-20 23:46:15,327 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-20 23:46:15,327 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-20 23:46:15,330 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:46:15,330 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:46:15,331 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:46:15,331 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:46:15,331 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:46:15,331 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:46:15,331 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:46:15,331 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-20 23:46:15,331 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:46:15,332 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states. [2018-01-20 23:46:15,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-20 23:46:15,333 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:15,334 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:15,334 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:15,334 INFO L82 PathProgramCache]: Analyzing trace with hash 1331820257, now seen corresponding path program 1 times [2018-01-20 23:46:15,334 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:15,335 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,335 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:15,335 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,335 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:15,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:15,343 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:15,355 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:46:15,355 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:46:15,355 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-20 23:46:15,356 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:46:15,356 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-20 23:46:15,356 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-20 23:46:15,356 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:46:15,357 INFO L87 Difference]: Start difference. First operand 43 states. Second operand 2 states. [2018-01-20 23:46:15,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:15,361 INFO L93 Difference]: Finished difference Result 76 states and 90 transitions. [2018-01-20 23:46:15,362 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-20 23:46:15,362 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-20 23:46:15,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:15,364 INFO L225 Difference]: With dead ends: 76 [2018-01-20 23:46:15,364 INFO L226 Difference]: Without dead ends: 39 [2018-01-20 23:46:15,364 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 [2018-01-20 23:46:15,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-01-20 23:46:15,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-01-20 23:46:15,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-01-20 23:46:15,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2018-01-20 23:46:15,374 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 17 [2018-01-20 23:46:15,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:15,375 INFO L432 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2018-01-20 23:46:15,375 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-20 23:46:15,375 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2018-01-20 23:46:15,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-20 23:46:15,376 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:15,376 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:15,376 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:15,376 INFO L82 PathProgramCache]: Analyzing trace with hash -1785977394, now seen corresponding path program 1 times [2018-01-20 23:46:15,376 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:15,377 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,377 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:15,377 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,377 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:15,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:15,390 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:15,424 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:46:15,424 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:46:15,424 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-20 23:46:15,425 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:46:15,426 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-20 23:46:15,426 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-20 23:46:15,426 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-20 23:46:15,427 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 3 states. [2018-01-20 23:46:15,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:15,474 INFO L93 Difference]: Finished difference Result 58 states and 64 transitions. [2018-01-20 23:46:15,474 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-20 23:46:15,475 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-20 23:46:15,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:15,477 INFO L225 Difference]: With dead ends: 58 [2018-01-20 23:46:15,478 INFO L226 Difference]: Without dead ends: 43 [2018-01-20 23:46:15,479 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 [2018-01-20 23:46:15,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-01-20 23:46:15,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 38. [2018-01-20 23:46:15,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-01-20 23:46:15,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-01-20 23:46:15,492 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 19 [2018-01-20 23:46:15,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:15,493 INFO L432 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-01-20 23:46:15,493 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-20 23:46:15,493 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-01-20 23:46:15,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-20 23:46:15,494 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:15,494 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] [2018-01-20 23:46:15,495 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:15,495 INFO L82 PathProgramCache]: Analyzing trace with hash -751966911, now seen corresponding path program 1 times [2018-01-20 23:46:15,495 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:15,496 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,496 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:15,496 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,496 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:15,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:15,514 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:15,648 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:46:15,648 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:46:15,648 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-01-20 23:46:15,648 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:46:15,649 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-20 23:46:15,649 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-20 23:46:15,649 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-01-20 23:46:15,649 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 6 states. [2018-01-20 23:46:15,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:15,789 INFO L93 Difference]: Finished difference Result 79 states and 86 transitions. [2018-01-20 23:46:15,790 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-20 23:46:15,790 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 34 [2018-01-20 23:46:15,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:15,792 INFO L225 Difference]: With dead ends: 79 [2018-01-20 23:46:15,792 INFO L226 Difference]: Without dead ends: 51 [2018-01-20 23:46:15,793 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-01-20 23:46:15,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-20 23:46:15,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 44. [2018-01-20 23:46:15,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-20 23:46:15,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2018-01-20 23:46:15,799 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 34 [2018-01-20 23:46:15,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:15,799 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2018-01-20 23:46:15,799 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-20 23:46:15,799 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2018-01-20 23:46:15,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-20 23:46:15,801 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:15,801 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:15,801 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:15,802 INFO L82 PathProgramCache]: Analyzing trace with hash -335791331, now seen corresponding path program 1 times [2018-01-20 23:46:15,802 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:15,803 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,803 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:15,803 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,803 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:15,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:15,820 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:15,863 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-20 23:46:15,863 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:15,863 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:15,864 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 40 with the following transitions: [2018-01-20 23:46:15,866 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [74], [76], [77], [78], [79], [80], [81] [2018-01-20 23:46:15,912 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-20 23:46:15,913 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-20 23:46:16,752 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-20 23:46:16,754 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. [2018-01-20 23:46:16,767 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-20 23:46:16,767 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:16,768 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 [2018-01-20 23:46:16,782 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:16,782 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:46:16,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:16,820 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:16,846 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-20 23:46:16,846 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:16,907 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-20 23:46:16,940 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:16,940 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 [2018-01-20 23:46:16,944 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:16,944 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:46:16,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:16,985 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:16,993 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-20 23:46:16,993 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:17,033 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-20 23:46:17,035 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:17,036 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-20 23:46:17,036 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:17,037 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-20 23:46:17,037 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-20 23:46:17,037 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-20 23:46:17,037 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 5 states. [2018-01-20 23:46:17,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:17,077 INFO L93 Difference]: Finished difference Result 67 states and 74 transitions. [2018-01-20 23:46:17,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-20 23:46:17,078 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 39 [2018-01-20 23:46:17,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:17,079 INFO L225 Difference]: With dead ends: 67 [2018-01-20 23:46:17,080 INFO L226 Difference]: Without dead ends: 55 [2018-01-20 23:46:17,080 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-20 23:46:17,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-01-20 23:46:17,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 50. [2018-01-20 23:46:17,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-01-20 23:46:17,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2018-01-20 23:46:17,090 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 39 [2018-01-20 23:46:17,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:17,090 INFO L432 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2018-01-20 23:46:17,090 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-20 23:46:17,091 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2018-01-20 23:46:17,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-20 23:46:17,092 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:17,093 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] [2018-01-20 23:46:17,093 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:17,093 INFO L82 PathProgramCache]: Analyzing trace with hash -291520001, now seen corresponding path program 2 times [2018-01-20 23:46:17,094 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:17,095 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:17,095 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:17,095 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:17,095 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:17,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:17,119 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:17,191 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-20 23:46:17,192 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:17,192 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:17,192 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:17,192 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:17,193 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:17,193 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 [2018-01-20 23:46:17,202 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:46:17,202 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:46:17,216 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:17,238 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:17,250 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:17,254 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:17,344 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-20 23:46:17,345 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:17,496 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-20 23:46:17,531 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-20 23:46:17,531 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5] total 11 [2018-01-20 23:46:17,531 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:46:17,532 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-20 23:46:17,532 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-20 23:46:17,532 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-01-20 23:46:17,533 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 6 states. [2018-01-20 23:46:17,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:17,659 INFO L93 Difference]: Finished difference Result 86 states and 93 transitions. [2018-01-20 23:46:17,659 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-20 23:46:17,659 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 52 [2018-01-20 23:46:17,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:17,661 INFO L225 Difference]: With dead ends: 86 [2018-01-20 23:46:17,661 INFO L226 Difference]: Without dead ends: 50 [2018-01-20 23:46:17,662 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2018-01-20 23:46:17,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-01-20 23:46:17,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2018-01-20 23:46:17,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-01-20 23:46:17,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2018-01-20 23:46:17,668 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 52 [2018-01-20 23:46:17,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:17,668 INFO L432 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2018-01-20 23:46:17,668 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-20 23:46:17,668 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2018-01-20 23:46:17,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-01-20 23:46:17,670 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:17,670 INFO L322 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:17,670 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:17,671 INFO L82 PathProgramCache]: Analyzing trace with hash -41114337, now seen corresponding path program 3 times [2018-01-20 23:46:17,671 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:17,672 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:17,672 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:46:17,672 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:17,672 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:17,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:17,692 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:17,749 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-20 23:46:17,750 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:17,750 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:17,750 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:17,750 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:17,750 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:17,750 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 [2018-01-20 23:46:17,755 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:46:17,755 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:46:17,767 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:17,778 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:17,786 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:17,787 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:17,791 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:17,854 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-20 23:46:17,854 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:18,003 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-20 23:46:18,025 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:18,025 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 [2018-01-20 23:46:18,028 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:46:18,028 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:46:18,042 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:18,051 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:18,067 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:18,077 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:18,081 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:18,088 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-20 23:46:18,088 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:18,134 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-20 23:46:18,136 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:18,136 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7, 5, 5] total 15 [2018-01-20 23:46:18,136 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:18,136 INFO L409 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-01-20 23:46:18,136 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-01-20 23:46:18,137 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2018-01-20 23:46:18,137 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand 9 states. [2018-01-20 23:46:18,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:18,253 INFO L93 Difference]: Finished difference Result 107 states and 119 transitions. [2018-01-20 23:46:18,253 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-20 23:46:18,253 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 57 [2018-01-20 23:46:18,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:18,255 INFO L225 Difference]: With dead ends: 107 [2018-01-20 23:46:18,255 INFO L226 Difference]: Without dead ends: 95 [2018-01-20 23:46:18,256 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 217 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=75, Invalid=197, Unknown=0, NotChecked=0, Total=272 [2018-01-20 23:46:18,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-01-20 23:46:18,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 78. [2018-01-20 23:46:18,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-01-20 23:46:18,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 86 transitions. [2018-01-20 23:46:18,266 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 86 transitions. Word has length 57 [2018-01-20 23:46:18,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:18,266 INFO L432 AbstractCegarLoop]: Abstraction has 78 states and 86 transitions. [2018-01-20 23:46:18,266 INFO L433 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-01-20 23:46:18,267 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 86 transitions. [2018-01-20 23:46:18,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-01-20 23:46:18,268 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:18,269 INFO L322 BasicCegarLoop]: trace histogram [8, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:18,269 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:18,269 INFO L82 PathProgramCache]: Analyzing trace with hash 1962089693, now seen corresponding path program 4 times [2018-01-20 23:46:18,269 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:18,270 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:18,270 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:46:18,271 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:18,271 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:18,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:18,296 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:18,426 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-20 23:46:18,452 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:18,452 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:18,452 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:18,452 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:18,452 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:18,452 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-01-20 23:46:18,458 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:46:18,458 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:46:18,507 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:18,512 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:18,650 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-20 23:46:18,651 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:18,817 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-20 23:46:18,851 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:18,852 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 [2018-01-20 23:46:18,856 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:46:18,856 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:46:18,910 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:18,915 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:18,935 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-20 23:46:18,935 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:19,061 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-20 23:46:19,064 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:19,064 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 9, 9, 9] total 16 [2018-01-20 23:46:19,064 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:19,065 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-20 23:46:19,065 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-20 23:46:19,065 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2018-01-20 23:46:19,066 INFO L87 Difference]: Start difference. First operand 78 states and 86 transitions. Second operand 13 states. [2018-01-20 23:46:19,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:19,254 INFO L93 Difference]: Finished difference Result 200 states and 228 transitions. [2018-01-20 23:46:19,255 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-20 23:46:19,255 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 85 [2018-01-20 23:46:19,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:19,257 INFO L225 Difference]: With dead ends: 200 [2018-01-20 23:46:19,257 INFO L226 Difference]: Without dead ends: 149 [2018-01-20 23:46:19,258 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 320 SyntacticMatches, 10 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=102, Invalid=360, Unknown=0, NotChecked=0, Total=462 [2018-01-20 23:46:19,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-01-20 23:46:19,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 106. [2018-01-20 23:46:19,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-01-20 23:46:19,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 116 transitions. [2018-01-20 23:46:19,273 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 116 transitions. Word has length 85 [2018-01-20 23:46:19,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:19,273 INFO L432 AbstractCegarLoop]: Abstraction has 106 states and 116 transitions. [2018-01-20 23:46:19,273 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-20 23:46:19,273 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 116 transitions. [2018-01-20 23:46:19,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-01-20 23:46:19,275 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:19,276 INFO L322 BasicCegarLoop]: trace histogram [12, 8, 8, 8, 8, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:19,276 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:19,276 INFO L82 PathProgramCache]: Analyzing trace with hash -1278120925, now seen corresponding path program 5 times [2018-01-20 23:46:19,276 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:19,277 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:19,277 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:46:19,277 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:19,277 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:19,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:19,304 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:19,468 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2018-01-20 23:46:19,468 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:19,468 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:19,468 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:19,468 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:19,469 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:19,469 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 [2018-01-20 23:46:19,482 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:46:19,482 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:46:19,493 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:19,509 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:19,515 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:19,516 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:19,519 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:19,609 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 147 proven. 18 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2018-01-20 23:46:19,609 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:19,806 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 33 proven. 128 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2018-01-20 23:46:19,840 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:19,841 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 [2018-01-20 23:46:19,844 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:46:19,844 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:46:19,855 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:19,866 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:19,885 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:19,896 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:19,900 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:19,915 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 147 proven. 18 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2018-01-20 23:46:19,916 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:20,082 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 33 proven. 128 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2018-01-20 23:46:20,084 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:20,084 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9, 9, 9] total 17 [2018-01-20 23:46:20,084 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:20,085 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-20 23:46:20,085 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-20 23:46:20,085 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2018-01-20 23:46:20,086 INFO L87 Difference]: Start difference. First operand 106 states and 116 transitions. Second operand 14 states. [2018-01-20 23:46:20,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:20,310 INFO L93 Difference]: Finished difference Result 180 states and 196 transitions. [2018-01-20 23:46:20,310 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-20 23:46:20,310 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 113 [2018-01-20 23:46:20,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:20,311 INFO L225 Difference]: With dead ends: 180 [2018-01-20 23:46:20,312 INFO L226 Difference]: Without dead ends: 121 [2018-01-20 23:46:20,313 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 434 SyntacticMatches, 12 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=142, Invalid=560, Unknown=0, NotChecked=0, Total=702 [2018-01-20 23:46:20,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-01-20 23:46:20,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 105. [2018-01-20 23:46:20,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-01-20 23:46:20,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 114 transitions. [2018-01-20 23:46:20,322 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 114 transitions. Word has length 113 [2018-01-20 23:46:20,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:20,323 INFO L432 AbstractCegarLoop]: Abstraction has 105 states and 114 transitions. [2018-01-20 23:46:20,323 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-20 23:46:20,323 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 114 transitions. [2018-01-20 23:46:20,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-01-20 23:46:20,325 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:20,325 INFO L322 BasicCegarLoop]: trace histogram [17, 12, 12, 12, 12, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:20,325 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:20,325 INFO L82 PathProgramCache]: Analyzing trace with hash -1614733819, now seen corresponding path program 6 times [2018-01-20 23:46:20,325 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:20,326 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:20,326 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:46:20,327 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:20,327 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:20,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:20,357 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:20,482 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-20 23:46:20,483 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:20,483 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:20,483 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:20,483 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:20,483 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:20,483 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 [2018-01-20 23:46:20,488 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:46:20,488 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:46:20,498 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:20,502 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:20,505 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:20,506 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:20,510 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:20,513 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:20,518 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:20,524 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:20,530 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:20,531 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:20,536 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:20,601 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 179 proven. 89 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2018-01-20 23:46:20,601 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:20,770 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 179 proven. 89 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2018-01-20 23:46:20,791 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:20,791 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 [2018-01-20 23:46:20,794 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:46:20,794 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:46:20,808 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:20,817 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:20,831 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:20,853 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:20,875 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:20,915 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:21,040 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:21,529 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:22,561 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:22,605 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:22,612 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:22,640 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-20 23:46:22,641 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:22,759 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-20 23:46:22,762 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:22,762 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 10, 8, 8] total 25 [2018-01-20 23:46:22,762 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:22,763 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-20 23:46:22,763 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-20 23:46:22,763 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=438, Unknown=0, NotChecked=0, Total=600 [2018-01-20 23:46:22,763 INFO L87 Difference]: Start difference. First operand 105 states and 114 transitions. Second operand 13 states. [2018-01-20 23:46:22,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:22,947 INFO L93 Difference]: Finished difference Result 234 states and 263 transitions. [2018-01-20 23:46:22,947 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-20 23:46:22,947 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 146 [2018-01-20 23:46:22,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:22,949 INFO L225 Difference]: With dead ends: 234 [2018-01-20 23:46:22,949 INFO L226 Difference]: Without dead ends: 222 [2018-01-20 23:46:22,950 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 594 GetRequests, 566 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=602, Unknown=0, NotChecked=0, Total=812 [2018-01-20 23:46:22,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-01-20 23:46:22,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 146. [2018-01-20 23:46:22,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2018-01-20 23:46:22,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 163 transitions. [2018-01-20 23:46:22,962 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 163 transitions. Word has length 146 [2018-01-20 23:46:22,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:22,962 INFO L432 AbstractCegarLoop]: Abstraction has 146 states and 163 transitions. [2018-01-20 23:46:22,963 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-20 23:46:22,963 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 163 transitions. [2018-01-20 23:46:22,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-01-20 23:46:22,964 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:22,964 INFO L322 BasicCegarLoop]: trace histogram [24, 18, 18, 18, 18, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:22,964 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:22,965 INFO L82 PathProgramCache]: Analyzing trace with hash 1755240795, now seen corresponding path program 7 times [2018-01-20 23:46:22,965 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:22,965 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:22,965 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:46:22,965 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:22,965 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:22,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:22,995 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:23,159 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-20 23:46:23,159 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:23,159 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:23,159 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:23,159 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:23,159 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:23,160 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 [2018-01-20 23:46:23,165 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:23,165 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:46:23,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:23,210 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:23,357 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 761 proven. 38 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2018-01-20 23:46:23,357 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:23,651 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 383 proven. 139 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2018-01-20 23:46:23,674 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:23,674 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 [2018-01-20 23:46:23,680 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:23,680 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:46:23,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:23,792 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:23,821 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 761 proven. 38 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2018-01-20 23:46:23,821 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:23,974 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 383 proven. 139 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2018-01-20 23:46:23,976 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:23,976 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13, 13, 13, 13] total 25 [2018-01-20 23:46:23,976 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:23,976 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-20 23:46:23,976 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-20 23:46:23,977 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2018-01-20 23:46:23,977 INFO L87 Difference]: Start difference. First operand 146 states and 163 transitions. Second operand 20 states. [2018-01-20 23:46:24,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:24,277 INFO L93 Difference]: Finished difference Result 370 states and 422 transitions. [2018-01-20 23:46:24,277 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-20 23:46:24,277 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 189 [2018-01-20 23:46:24,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:24,279 INFO L225 Difference]: With dead ends: 370 [2018-01-20 23:46:24,279 INFO L226 Difference]: Without dead ends: 296 [2018-01-20 23:46:24,280 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 774 GetRequests, 726 SyntacticMatches, 14 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 402 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=244, Invalid=1016, Unknown=0, NotChecked=0, Total=1260 [2018-01-20 23:46:24,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2018-01-20 23:46:24,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 184. [2018-01-20 23:46:24,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-01-20 23:46:24,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 204 transitions. [2018-01-20 23:46:24,295 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 204 transitions. Word has length 189 [2018-01-20 23:46:24,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:24,296 INFO L432 AbstractCegarLoop]: Abstraction has 184 states and 204 transitions. [2018-01-20 23:46:24,296 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-20 23:46:24,296 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 204 transitions. [2018-01-20 23:46:24,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 233 [2018-01-20 23:46:24,298 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:24,298 INFO L322 BasicCegarLoop]: trace histogram [31, 24, 24, 24, 24, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:24,298 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:24,299 INFO L82 PathProgramCache]: Analyzing trace with hash 519411977, now seen corresponding path program 8 times [2018-01-20 23:46:24,299 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:24,299 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:24,300 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:24,300 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:24,300 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:24,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:24,328 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:24,506 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1842 trivial. 0 not checked. [2018-01-20 23:46:24,506 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:24,507 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:24,507 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:24,507 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:24,507 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:24,507 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 [2018-01-20 23:46:24,512 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:46:24,512 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:46:24,528 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:24,554 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:24,559 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:24,563 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:24,652 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 1178 proven. 21 refuted. 0 times theorem prover too weak. 804 trivial. 0 not checked. [2018-01-20 23:46:24,652 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:24,842 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 257 proven. 309 refuted. 0 times theorem prover too weak. 1437 trivial. 0 not checked. [2018-01-20 23:46:24,863 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:24,863 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 [2018-01-20 23:46:24,866 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:46:24,866 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:46:24,887 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:24,932 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:24,969 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:24,978 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:25,012 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 1178 proven. 21 refuted. 0 times theorem prover too weak. 804 trivial. 0 not checked. [2018-01-20 23:46:25,012 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:25,229 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 257 proven. 309 refuted. 0 times theorem prover too weak. 1437 trivial. 0 not checked. [2018-01-20 23:46:25,231 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:25,231 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11, 11, 11] total 23 [2018-01-20 23:46:25,231 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:25,232 INFO L409 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-01-20 23:46:25,232 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-01-20 23:46:25,233 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=402, Unknown=0, NotChecked=0, Total=506 [2018-01-20 23:46:25,233 INFO L87 Difference]: Start difference. First operand 184 states and 204 transitions. Second operand 19 states. [2018-01-20 23:46:25,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:25,472 INFO L93 Difference]: Finished difference Result 330 states and 362 transitions. [2018-01-20 23:46:25,472 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-20 23:46:25,472 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 232 [2018-01-20 23:46:25,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:25,474 INFO L225 Difference]: With dead ends: 330 [2018-01-20 23:46:25,474 INFO L226 Difference]: Without dead ends: 248 [2018-01-20 23:46:25,474 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 947 GetRequests, 903 SyntacticMatches, 12 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 338 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=225, Invalid=897, Unknown=0, NotChecked=0, Total=1122 [2018-01-20 23:46:25,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2018-01-20 23:46:25,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 183. [2018-01-20 23:46:25,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-01-20 23:46:25,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 202 transitions. [2018-01-20 23:46:25,486 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 202 transitions. Word has length 232 [2018-01-20 23:46:25,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:25,487 INFO L432 AbstractCegarLoop]: Abstraction has 183 states and 202 transitions. [2018-01-20 23:46:25,487 INFO L433 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-01-20 23:46:25,487 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 202 transitions. [2018-01-20 23:46:25,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-01-20 23:46:25,490 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:25,490 INFO L322 BasicCegarLoop]: trace histogram [38, 30, 30, 30, 30, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:25,490 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:25,490 INFO L82 PathProgramCache]: Analyzing trace with hash -881233501, now seen corresponding path program 9 times [2018-01-20 23:46:25,490 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:25,491 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:25,491 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:46:25,491 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:25,491 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:25,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:25,517 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:25,675 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-01-20 23:46:25,676 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:25,676 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:25,676 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:25,676 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:25,676 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:25,676 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 [2018-01-20 23:46:25,681 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:46:25,681 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:46:25,701 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:25,704 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:25,708 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:25,713 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:25,719 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:25,725 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:25,730 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:25,731 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:25,735 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:25,848 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-20 23:46:25,848 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:26,122 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-20 23:46:26,142 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:26,142 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 [2018-01-20 23:46:26,145 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:46:26,146 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:46:26,170 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:26,179 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:26,193 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:26,214 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:26,250 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:26,321 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:26,632 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:26,657 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:26,666 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:26,723 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-20 23:46:26,724 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:26,978 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-20 23:46:26,981 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:26,981 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 27 [2018-01-20 23:46:26,981 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:26,982 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-20 23:46:26,982 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-20 23:46:26,982 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=517, Unknown=0, NotChecked=0, Total=702 [2018-01-20 23:46:26,983 INFO L87 Difference]: Start difference. First operand 183 states and 202 transitions. Second operand 18 states. [2018-01-20 23:46:27,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:27,281 INFO L93 Difference]: Finished difference Result 420 states and 476 transitions. [2018-01-20 23:46:27,281 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-01-20 23:46:27,281 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 275 [2018-01-20 23:46:27,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:27,285 INFO L225 Difference]: With dead ends: 420 [2018-01-20 23:46:27,285 INFO L226 Difference]: Without dead ends: 408 [2018-01-20 23:46:27,286 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1115 GetRequests, 1082 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=281, Invalid=775, Unknown=0, NotChecked=0, Total=1056 [2018-01-20 23:46:27,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2018-01-20 23:46:27,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 234. [2018-01-20 23:46:27,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 234 states. [2018-01-20 23:46:27,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 264 transitions. [2018-01-20 23:46:27,308 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 264 transitions. Word has length 275 [2018-01-20 23:46:27,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:27,309 INFO L432 AbstractCegarLoop]: Abstraction has 234 states and 264 transitions. [2018-01-20 23:46:27,309 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-20 23:46:27,309 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 264 transitions. [2018-01-20 23:46:27,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2018-01-20 23:46:27,312 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:27,312 INFO L322 BasicCegarLoop]: trace histogram [48, 39, 39, 39, 39, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:27,312 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:27,313 INFO L82 PathProgramCache]: Analyzing trace with hash 2119777693, now seen corresponding path program 10 times [2018-01-20 23:46:27,313 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:27,314 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:27,314 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:46:27,314 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:27,314 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:27,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:27,356 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:27,745 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 4623 trivial. 0 not checked. [2018-01-20 23:46:27,746 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:27,746 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:27,746 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:27,746 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:27,746 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:27,747 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 [2018-01-20 23:46:27,758 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:46:27,758 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:46:27,846 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:27,854 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:28,075 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 3005 proven. 87 refuted. 0 times theorem prover too weak. 1801 trivial. 0 not checked. [2018-01-20 23:46:28,076 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:28,525 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1025 proven. 505 refuted. 0 times theorem prover too weak. 3363 trivial. 0 not checked. [2018-01-20 23:46:28,545 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:28,546 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 [2018-01-20 23:46:28,549 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:46:28,549 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:46:28,685 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:28,697 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:28,760 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 3005 proven. 87 refuted. 0 times theorem prover too weak. 1801 trivial. 0 not checked. [2018-01-20 23:46:28,760 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:29,138 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1025 proven. 505 refuted. 0 times theorem prover too weak. 3363 trivial. 0 not checked. [2018-01-20 23:46:29,140 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:29,141 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17, 17, 17, 17] total 34 [2018-01-20 23:46:29,141 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:29,141 INFO L409 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-01-20 23:46:29,142 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-01-20 23:46:29,142 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=913, Unknown=0, NotChecked=0, Total=1122 [2018-01-20 23:46:29,142 INFO L87 Difference]: Start difference. First operand 234 states and 264 transitions. Second operand 27 states. [2018-01-20 23:46:29,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:29,646 INFO L93 Difference]: Finished difference Result 592 states and 676 transitions. [2018-01-20 23:46:29,646 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-20 23:46:29,646 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 333 [2018-01-20 23:46:29,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:29,648 INFO L225 Difference]: With dead ends: 592 [2018-01-20 23:46:29,648 INFO L226 Difference]: Without dead ends: 495 [2018-01-20 23:46:29,649 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1358 GetRequests, 1292 SyntacticMatches, 18 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 812 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=445, Invalid=2005, Unknown=0, NotChecked=0, Total=2450 [2018-01-20 23:46:29,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 495 states. [2018-01-20 23:46:29,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 495 to 282. [2018-01-20 23:46:29,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 282 states. [2018-01-20 23:46:29,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 316 transitions. [2018-01-20 23:46:29,670 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 316 transitions. Word has length 333 [2018-01-20 23:46:29,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:29,670 INFO L432 AbstractCegarLoop]: Abstraction has 282 states and 316 transitions. [2018-01-20 23:46:29,671 INFO L433 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-01-20 23:46:29,671 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 316 transitions. [2018-01-20 23:46:29,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 392 [2018-01-20 23:46:29,674 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:29,674 INFO L322 BasicCegarLoop]: trace histogram [58, 48, 48, 48, 48, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:29,674 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:29,674 INFO L82 PathProgramCache]: Analyzing trace with hash -1106394585, now seen corresponding path program 11 times [2018-01-20 23:46:29,675 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:29,675 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:29,675 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:46:29,676 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:29,676 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:29,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:29,720 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:30,035 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 0 proven. 335 refuted. 0 times theorem prover too weak. 6870 trivial. 0 not checked. [2018-01-20 23:46:30,036 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:30,036 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:30,036 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:30,036 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:30,036 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:30,036 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 [2018-01-20 23:46:30,041 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:46:30,041 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:46:30,067 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:30,073 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:30,079 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:30,086 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:30,093 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:30,101 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:30,108 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:30,110 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:30,115 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:30,322 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 4140 proven. 307 refuted. 0 times theorem prover too weak. 2758 trivial. 0 not checked. [2018-01-20 23:46:30,322 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:30,706 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 707 proven. 1488 refuted. 0 times theorem prover too weak. 5010 trivial. 0 not checked. [2018-01-20 23:46:30,727 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:30,727 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 [2018-01-20 23:46:30,730 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:46:30,730 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:46:30,754 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:30,764 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:30,784 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:30,822 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:30,869 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:31,399 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:31,575 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:31,611 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:31,623 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:31,707 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 4140 proven. 307 refuted. 0 times theorem prover too weak. 2758 trivial. 0 not checked. [2018-01-20 23:46:31,707 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:31,980 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 707 proven. 1488 refuted. 0 times theorem prover too weak. 5010 trivial. 0 not checked. [2018-01-20 23:46:31,982 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:31,982 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 17, 17, 17, 17] total 36 [2018-01-20 23:46:31,982 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:31,983 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-20 23:46:31,984 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-20 23:46:31,984 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=1062, Unknown=0, NotChecked=0, Total=1260 [2018-01-20 23:46:31,984 INFO L87 Difference]: Start difference. First operand 282 states and 316 transitions. Second operand 28 states. [2018-01-20 23:46:32,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:32,812 INFO L93 Difference]: Finished difference Result 640 states and 719 transitions. [2018-01-20 23:46:32,812 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-20 23:46:32,812 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 391 [2018-01-20 23:46:32,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:32,815 INFO L225 Difference]: With dead ends: 640 [2018-01-20 23:46:32,815 INFO L226 Difference]: Without dead ends: 345 [2018-01-20 23:46:32,818 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1601 GetRequests, 1523 SyntacticMatches, 18 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=623, Invalid=3159, Unknown=0, NotChecked=0, Total=3782 [2018-01-20 23:46:32,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 345 states. [2018-01-20 23:46:32,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 345 to 281. [2018-01-20 23:46:32,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 281 states. [2018-01-20 23:46:32,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 307 transitions. [2018-01-20 23:46:32,841 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 307 transitions. Word has length 391 [2018-01-20 23:46:32,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:32,841 INFO L432 AbstractCegarLoop]: Abstraction has 281 states and 307 transitions. [2018-01-20 23:46:32,841 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-20 23:46:32,841 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 307 transitions. [2018-01-20 23:46:32,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 445 [2018-01-20 23:46:32,845 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:32,845 INFO L322 BasicCegarLoop]: trace histogram [67, 56, 56, 56, 56, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:32,845 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:32,845 INFO L82 PathProgramCache]: Analyzing trace with hash -785380599, now seen corresponding path program 12 times [2018-01-20 23:46:32,846 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:32,846 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:32,846 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:46:32,846 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:32,847 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:32,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:32,892 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:33,496 INFO L134 CoverageAnalysis]: Checked inductivity of 9669 backedges. 0 proven. 407 refuted. 0 times theorem prover too weak. 9262 trivial. 0 not checked. [2018-01-20 23:46:33,496 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:33,530 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:33,531 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:33,531 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:33,531 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:33,531 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 [2018-01-20 23:46:33,538 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:46:33,538 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:46:33,563 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:33,567 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:33,571 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:33,575 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:33,580 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:33,586 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:33,594 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:33,604 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:33,619 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:33,643 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:33,685 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:33,700 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:33,731 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:33,750 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:33,805 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:33,845 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:33,899 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:33,901 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:33,909 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:34,195 INFO L134 CoverageAnalysis]: Checked inductivity of 9669 backedges. 2065 proven. 119 refuted. 0 times theorem prover too weak. 7485 trivial. 0 not checked. [2018-01-20 23:46:34,196 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:34,807 INFO L134 CoverageAnalysis]: Checked inductivity of 9669 backedges. 2065 proven. 119 refuted. 0 times theorem prover too weak. 7485 trivial. 0 not checked. [2018-01-20 23:46:34,828 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:34,828 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 [2018-01-20 23:46:34,831 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:46:34,831 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:46:34,862 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:34,872 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:34,894 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:34,929 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:35,001 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:40,794 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:42,243 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:47,498 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:59,546 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:11,619 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown