java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_smtcomp.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_false-valid-deref-read.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 10:28:25,185 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 10:28:25,186 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 10:28:25,202 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 10:28:25,202 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 10:28:25,203 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 10:28:25,204 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 10:28:25,206 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 10:28:25,208 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 10:28:25,209 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 10:28:25,210 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 10:28:25,211 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 10:28:25,212 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 10:28:25,213 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 10:28:25,214 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 10:28:25,217 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 10:28:25,219 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 10:28:25,221 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 10:28:25,222 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 10:28:25,224 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 10:28:25,226 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 10:28:25,226 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 10:28:25,227 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 10:28:25,228 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 10:28:25,229 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 10:28:25,230 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 10:28:25,230 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 10:28:25,231 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 10:28:25,231 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 10:28:25,231 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 10:28:25,232 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 10:28:25,232 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_smtcomp.epf [2018-01-21 10:28:25,242 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 10:28:25,242 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 10:28:25,243 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 10:28:25,244 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 10:28:25,244 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 10:28:25,244 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 10:28:25,244 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-21 10:28:25,244 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 10:28:25,245 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 10:28:25,245 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 10:28:25,245 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 10:28:25,245 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 10:28:25,245 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 10:28:25,245 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 10:28:25,245 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 10:28:25,246 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 10:28:25,246 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 10:28:25,246 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 10:28:25,246 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 10:28:25,246 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 10:28:25,246 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 10:28:25,246 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 10:28:25,247 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 10:28:25,247 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 10:28:25,247 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 10:28:25,247 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 10:28:25,247 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 10:28:25,248 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 10:28:25,248 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 10:28:25,248 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 10:28:25,248 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 10:28:25,248 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 10:28:25,248 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 10:28:25,248 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 10:28:25,248 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 10:28:25,248 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 10:28:25,249 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 10:28:25,249 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 10:28:25,249 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 10:28:25,284 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 10:28:25,295 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 10:28:25,298 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 10:28:25,299 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 10:28:25,300 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 10:28:25,300 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_false-valid-deref-read.c [2018-01-21 10:28:25,412 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 10:28:25,416 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 10:28:25,417 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 10:28:25,417 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 10:28:25,422 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 10:28:25,423 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:28:25" (1/1) ... [2018-01-21 10:28:25,426 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@60b199dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:25, skipping insertion in model container [2018-01-21 10:28:25,426 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:28:25" (1/1) ... [2018-01-21 10:28:25,440 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:28:25,454 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:28:25,561 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:28:25,578 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:28:25,587 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:25 WrapperNode [2018-01-21 10:28:25,587 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 10:28:25,588 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 10:28:25,588 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 10:28:25,588 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 10:28:25,606 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:25" (1/1) ... [2018-01-21 10:28:25,607 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:25" (1/1) ... [2018-01-21 10:28:25,616 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:25" (1/1) ... [2018-01-21 10:28:25,616 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:25" (1/1) ... [2018-01-21 10:28:25,619 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:25" (1/1) ... [2018-01-21 10:28:25,623 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:25" (1/1) ... [2018-01-21 10:28:25,624 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:25" (1/1) ... [2018-01-21 10:28:25,626 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 10:28:25,626 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 10:28:25,626 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 10:28:25,626 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 10:28:25,627 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:25" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 10:28:25,686 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 10:28:25,687 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 10:28:25,687 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 10:28:25,687 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 10:28:25,687 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 10:28:25,687 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 10:28:25,687 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 10:28:25,688 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 10:28:25,688 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 10:28:25,688 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 10:28:25,688 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 10:28:25,688 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 10:28:25,688 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 10:28:25,897 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 10:28:25,898 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:28:25 BoogieIcfgContainer [2018-01-21 10:28:25,898 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 10:28:25,898 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 10:28:25,898 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 10:28:25,900 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 10:28:25,901 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 10:28:25" (1/3) ... [2018-01-21 10:28:25,902 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1eb060af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:28:25, skipping insertion in model container [2018-01-21 10:28:25,902 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:25" (2/3) ... [2018-01-21 10:28:25,903 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1eb060af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:28:25, skipping insertion in model container [2018-01-21 10:28:25,903 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:28:25" (3/3) ... [2018-01-21 10:28:25,905 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength_false-valid-deref-read.c [2018-01-21 10:28:25,915 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 10:28:25,924 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 10:28:25,962 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:28:25,962 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:28:25,962 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:28:25,962 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:28:25,963 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:28:25,963 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:28:25,963 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:28:25,963 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 10:28:25,964 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:28:25,986 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states. [2018-01-21 10:28:25,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 10:28:25,993 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:25,994 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 10:28:25,994 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 10:28:26,000 INFO L82 PathProgramCache]: Analyzing trace with hash 102829, now seen corresponding path program 1 times [2018-01-21 10:28:26,003 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:26,061 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:26,061 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:26,062 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:26,062 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:26,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:28:26,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:28:26,124 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 10:28:26,130 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 10:28:26,135 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:28:26,136 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:28:26,136 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:28:26,136 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:28:26,136 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:28:26,136 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:28:26,136 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:28:26,136 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 10:28:26,136 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:28:26,138 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states. [2018-01-21 10:28:26,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 10:28:26,139 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:26,139 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:26,139 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 10:28:26,139 INFO L82 PathProgramCache]: Analyzing trace with hash 33657389, now seen corresponding path program 1 times [2018-01-21 10:28:26,139 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:26,140 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:26,140 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:26,140 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:26,141 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:26,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:26,166 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:26,194 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:28:26,195 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:28:26,195 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:28:26,195 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:28:26,197 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:28:26,207 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:28:26,207 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:28:26,209 INFO L87 Difference]: Start difference. First operand 43 states. Second operand 2 states. [2018-01-21 10:28:26,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:26,238 INFO L93 Difference]: Finished difference Result 76 states and 90 transitions. [2018-01-21 10:28:26,238 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:28:26,240 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 10:28:26,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:26,248 INFO L225 Difference]: With dead ends: 76 [2018-01-21 10:28:26,248 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 10:28:26,252 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:28:26,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 10:28:26,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 10:28:26,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 10:28:26,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 10:28:26,353 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 10:28:26,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:26,353 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 10:28:26,354 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:28:26,354 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 10:28:26,354 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 10:28:26,357 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:28:26,357 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:28:26,357 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:28:26,357 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:28:26,358 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:28:26,358 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:28:26,358 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:28:26,358 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 10:28:26,358 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:28:26,360 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states. [2018-01-21 10:28:26,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 10:28:26,362 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:26,362 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:26,362 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:26,362 INFO L82 PathProgramCache]: Analyzing trace with hash 1331820257, now seen corresponding path program 1 times [2018-01-21 10:28:26,363 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:26,364 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:26,364 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:26,364 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:26,364 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:26,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:26,374 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:26,387 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:28:26,388 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:28:26,388 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:28:26,388 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:28:26,388 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:28:26,388 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:28:26,389 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:28:26,389 INFO L87 Difference]: Start difference. First operand 43 states. Second operand 2 states. [2018-01-21 10:28:26,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:26,393 INFO L93 Difference]: Finished difference Result 76 states and 90 transitions. [2018-01-21 10:28:26,394 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:28:26,394 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 10:28:26,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:26,396 INFO L225 Difference]: With dead ends: 76 [2018-01-21 10:28:26,396 INFO L226 Difference]: Without dead ends: 39 [2018-01-21 10:28:26,396 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:28:26,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-01-21 10:28:26,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-01-21 10:28:26,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-01-21 10:28:26,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2018-01-21 10:28:26,408 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 17 [2018-01-21 10:28:26,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:26,408 INFO L432 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2018-01-21 10:28:26,408 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:28:26,408 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2018-01-21 10:28:26,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 10:28:26,409 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:26,409 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:26,409 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:26,409 INFO L82 PathProgramCache]: Analyzing trace with hash -1785977394, now seen corresponding path program 1 times [2018-01-21 10:28:26,410 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:26,410 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:26,410 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:26,411 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:26,411 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:26,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:26,424 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:26,460 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:28:26,460 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:28:26,460 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 10:28:26,461 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:28:26,462 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 10:28:26,462 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 10:28:26,463 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 10:28:26,463 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 3 states. [2018-01-21 10:28:26,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:26,505 INFO L93 Difference]: Finished difference Result 58 states and 64 transitions. [2018-01-21 10:28:26,505 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 10:28:26,506 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 10:28:26,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:26,508 INFO L225 Difference]: With dead ends: 58 [2018-01-21 10:28:26,508 INFO L226 Difference]: Without dead ends: 43 [2018-01-21 10:28:26,509 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 10:28:26,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-01-21 10:28:26,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 38. [2018-01-21 10:28:26,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-01-21 10:28:26,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-01-21 10:28:26,519 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 19 [2018-01-21 10:28:26,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:26,519 INFO L432 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-01-21 10:28:26,519 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 10:28:26,520 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-01-21 10:28:26,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 10:28:26,520 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:26,521 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:26,521 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:26,521 INFO L82 PathProgramCache]: Analyzing trace with hash -751966911, now seen corresponding path program 1 times [2018-01-21 10:28:26,521 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:26,522 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:26,522 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:26,522 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:26,522 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:26,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:26,542 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:26,671 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:28:26,671 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:28:26,671 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-01-21 10:28:26,671 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:28:26,672 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 10:28:26,672 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 10:28:26,672 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-01-21 10:28:26,672 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 6 states. [2018-01-21 10:28:26,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:26,835 INFO L93 Difference]: Finished difference Result 79 states and 86 transitions. [2018-01-21 10:28:26,835 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 10:28:26,836 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 34 [2018-01-21 10:28:26,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:26,839 INFO L225 Difference]: With dead ends: 79 [2018-01-21 10:28:26,839 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 10:28:26,840 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-01-21 10:28:26,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 10:28:26,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 44. [2018-01-21 10:28:26,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-21 10:28:26,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2018-01-21 10:28:26,848 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 34 [2018-01-21 10:28:26,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:26,848 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2018-01-21 10:28:26,848 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 10:28:26,848 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2018-01-21 10:28:26,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-21 10:28:26,851 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:26,851 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:26,851 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:26,852 INFO L82 PathProgramCache]: Analyzing trace with hash -335791331, now seen corresponding path program 1 times [2018-01-21 10:28:26,852 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:26,853 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:26,854 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:26,854 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:26,854 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:26,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:26,872 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:26,916 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:28:26,917 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:26,917 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:26,918 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 40 with the following transitions: [2018-01-21 10:28:26,919 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [74], [76], [77], [78], [79], [80], [81] [2018-01-21 10:28:26,961 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 10:28:26,962 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 10:28:27,734 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 10:28:27,735 INFO L268 AbstractInterpreter]: Visited 37 different actions 91 times. Merged at 25 different actions 41 times. Never widened. Found 6 fixpoints after 3 different actions. Largest state had 23 variables. [2018-01-21 10:28:27,748 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 10:28:27,748 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:27,748 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:27,764 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:27,764 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:28:27,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:27,799 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:27,842 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:28:27,843 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:27,963 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:28:27,998 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:27,999 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:28,007 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:28,008 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:28:28,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:28,051 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:28,061 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:28:28,061 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:28,105 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:28:28,107 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:28,108 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 10:28:28,108 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:28,109 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 10:28:28,109 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 10:28:28,109 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 10:28:28,110 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 5 states. [2018-01-21 10:28:28,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:28,155 INFO L93 Difference]: Finished difference Result 67 states and 74 transitions. [2018-01-21 10:28:28,155 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 10:28:28,155 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 39 [2018-01-21 10:28:28,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:28,157 INFO L225 Difference]: With dead ends: 67 [2018-01-21 10:28:28,157 INFO L226 Difference]: Without dead ends: 55 [2018-01-21 10:28:28,157 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 10:28:28,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-01-21 10:28:28,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 50. [2018-01-21 10:28:28,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-01-21 10:28:28,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2018-01-21 10:28:28,165 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 39 [2018-01-21 10:28:28,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:28,166 INFO L432 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2018-01-21 10:28:28,166 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 10:28:28,166 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2018-01-21 10:28:28,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-21 10:28:28,168 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:28,168 INFO L322 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:28,168 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:28,169 INFO L82 PathProgramCache]: Analyzing trace with hash -291520001, now seen corresponding path program 2 times [2018-01-21 10:28:28,169 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:28,170 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:28,170 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:28,170 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:28,170 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:28,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:28,192 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:28,265 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 10:28:28,266 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:28,266 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:28,266 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:28,266 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:28,266 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:28,267 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:28,272 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:28:28,273 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:28:28,288 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:28,297 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:28,300 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:28,304 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:28,414 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 10:28:28,415 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:28,633 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 10:28:28,656 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 10:28:28,656 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5] total 11 [2018-01-21 10:28:28,656 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:28:28,657 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 10:28:28,657 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 10:28:28,657 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-01-21 10:28:28,657 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 6 states. [2018-01-21 10:28:28,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:28,740 INFO L93 Difference]: Finished difference Result 86 states and 93 transitions. [2018-01-21 10:28:28,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 10:28:28,740 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 52 [2018-01-21 10:28:28,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:28,741 INFO L225 Difference]: With dead ends: 86 [2018-01-21 10:28:28,742 INFO L226 Difference]: Without dead ends: 50 [2018-01-21 10:28:28,742 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2018-01-21 10:28:28,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-01-21 10:28:28,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2018-01-21 10:28:28,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-01-21 10:28:28,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2018-01-21 10:28:28,746 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 52 [2018-01-21 10:28:28,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:28,747 INFO L432 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2018-01-21 10:28:28,747 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 10:28:28,747 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2018-01-21 10:28:28,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-01-21 10:28:28,748 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:28,748 INFO L322 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:28,748 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:28,749 INFO L82 PathProgramCache]: Analyzing trace with hash -41114337, now seen corresponding path program 3 times [2018-01-21 10:28:28,749 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:28,749 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:28,749 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:28:28,750 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:28,750 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:28,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:28,768 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:28,824 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 10:28:28,824 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:28,824 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:28,825 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:28,825 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:28,825 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:28,825 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:28,830 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:28:28,830 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:28:28,841 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:28,847 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:28,854 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:28,855 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:28,858 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:28,930 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-21 10:28:28,930 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:29,073 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-21 10:28:29,094 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:29,094 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:29,097 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:28:29,097 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:28:29,111 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:29,121 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:29,137 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:29,147 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:29,151 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:29,158 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 10:28:29,158 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:29,191 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 10:28:29,193 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:29,193 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7, 5, 5] total 15 [2018-01-21 10:28:29,193 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:29,193 INFO L409 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-01-21 10:28:29,193 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-01-21 10:28:29,193 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2018-01-21 10:28:29,194 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand 9 states. [2018-01-21 10:28:29,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:29,320 INFO L93 Difference]: Finished difference Result 107 states and 119 transitions. [2018-01-21 10:28:29,321 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 10:28:29,321 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 57 [2018-01-21 10:28:29,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:29,323 INFO L225 Difference]: With dead ends: 107 [2018-01-21 10:28:29,323 INFO L226 Difference]: Without dead ends: 95 [2018-01-21 10:28:29,324 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 [2018-01-21 10:28:29,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-01-21 10:28:29,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 78. [2018-01-21 10:28:29,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-01-21 10:28:29,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 86 transitions. [2018-01-21 10:28:29,335 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 86 transitions. Word has length 57 [2018-01-21 10:28:29,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:29,336 INFO L432 AbstractCegarLoop]: Abstraction has 78 states and 86 transitions. [2018-01-21 10:28:29,336 INFO L433 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-01-21 10:28:29,336 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 86 transitions. [2018-01-21 10:28:29,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-01-21 10:28:29,338 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:29,338 INFO L322 BasicCegarLoop]: trace histogram [8, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:29,338 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:29,339 INFO L82 PathProgramCache]: Analyzing trace with hash 1962089693, now seen corresponding path program 4 times [2018-01-21 10:28:29,339 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:29,340 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:29,340 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:28:29,340 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:29,340 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:29,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:29,365 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:29,471 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 10:28:29,472 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:29,472 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:29,472 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:29,472 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:29,472 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:29,472 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:29,481 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:28:29,482 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:28:29,514 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:29,518 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:29,642 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 10:28:29,643 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:29,804 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 10:28:29,839 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:29,839 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:29,844 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:28:29,845 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:28:29,889 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:29,895 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:29,935 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 10:28:29,935 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:30,066 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 10:28:30,067 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:30,068 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 9, 9, 9] total 16 [2018-01-21 10:28:30,068 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:30,068 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-21 10:28:30,068 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-21 10:28:30,069 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2018-01-21 10:28:30,069 INFO L87 Difference]: Start difference. First operand 78 states and 86 transitions. Second operand 13 states. [2018-01-21 10:28:30,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:30,238 INFO L93 Difference]: Finished difference Result 200 states and 228 transitions. [2018-01-21 10:28:30,238 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 10:28:30,239 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 85 [2018-01-21 10:28:30,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:30,241 INFO L225 Difference]: With dead ends: 200 [2018-01-21 10:28:30,241 INFO L226 Difference]: Without dead ends: 149 [2018-01-21 10:28:30,242 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 320 SyntacticMatches, 10 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=102, Invalid=360, Unknown=0, NotChecked=0, Total=462 [2018-01-21 10:28:30,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-01-21 10:28:30,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 106. [2018-01-21 10:28:30,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-01-21 10:28:30,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 116 transitions. [2018-01-21 10:28:30,256 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 116 transitions. Word has length 85 [2018-01-21 10:28:30,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:30,257 INFO L432 AbstractCegarLoop]: Abstraction has 106 states and 116 transitions. [2018-01-21 10:28:30,257 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-21 10:28:30,257 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 116 transitions. [2018-01-21 10:28:30,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-01-21 10:28:30,259 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:30,259 INFO L322 BasicCegarLoop]: trace histogram [12, 8, 8, 8, 8, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:30,259 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:30,260 INFO L82 PathProgramCache]: Analyzing trace with hash -1278120925, now seen corresponding path program 5 times [2018-01-21 10:28:30,260 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:30,260 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:30,261 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:28:30,261 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:30,261 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:30,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:30,286 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:30,413 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2018-01-21 10:28:30,413 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:30,413 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:30,414 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:30,414 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:30,414 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:30,414 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:30,421 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:28:30,421 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:28:30,430 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:30,434 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:30,438 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:30,439 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:30,442 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:30,497 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 147 proven. 18 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2018-01-21 10:28:30,497 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:30,655 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 33 proven. 128 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2018-01-21 10:28:30,688 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:30,688 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:30,692 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:28:30,692 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:28:30,705 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:30,714 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:30,733 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:30,743 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:30,747 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:30,763 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 147 proven. 18 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2018-01-21 10:28:30,763 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:30,987 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 33 proven. 128 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2018-01-21 10:28:30,989 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:30,989 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9, 9, 9] total 17 [2018-01-21 10:28:30,989 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:30,989 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 10:28:30,990 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 10:28:30,990 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2018-01-21 10:28:30,990 INFO L87 Difference]: Start difference. First operand 106 states and 116 transitions. Second operand 14 states. [2018-01-21 10:28:31,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:31,221 INFO L93 Difference]: Finished difference Result 180 states and 196 transitions. [2018-01-21 10:28:31,222 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 10:28:31,222 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 113 [2018-01-21 10:28:31,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:31,223 INFO L225 Difference]: With dead ends: 180 [2018-01-21 10:28:31,223 INFO L226 Difference]: Without dead ends: 121 [2018-01-21 10:28:31,224 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 434 SyntacticMatches, 12 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=142, Invalid=560, Unknown=0, NotChecked=0, Total=702 [2018-01-21 10:28:31,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-01-21 10:28:31,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 105. [2018-01-21 10:28:31,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-01-21 10:28:31,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 114 transitions. [2018-01-21 10:28:31,234 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 114 transitions. Word has length 113 [2018-01-21 10:28:31,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:31,234 INFO L432 AbstractCegarLoop]: Abstraction has 105 states and 114 transitions. [2018-01-21 10:28:31,234 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 10:28:31,234 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 114 transitions. [2018-01-21 10:28:31,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-01-21 10:28:31,241 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:31,241 INFO L322 BasicCegarLoop]: trace histogram [17, 12, 12, 12, 12, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:31,242 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:31,242 INFO L82 PathProgramCache]: Analyzing trace with hash -1614733819, now seen corresponding path program 6 times [2018-01-21 10:28:31,242 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:31,243 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:31,243 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:28:31,243 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:31,243 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:31,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:31,271 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:31,376 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-21 10:28:31,377 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:31,377 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:31,377 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:31,377 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:31,377 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:31,377 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:31,382 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:28:31,382 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:28:31,394 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:31,397 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:31,400 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:31,401 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:31,405 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:31,408 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:31,413 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:31,418 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:31,425 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:31,426 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:31,429 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:31,497 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 179 proven. 89 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2018-01-21 10:28:31,497 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:31,659 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 179 proven. 89 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2018-01-21 10:28:31,679 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:31,680 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:31,682 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:28:31,682 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:28:31,697 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:31,706 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:31,720 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:31,734 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:31,756 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:31,796 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:31,929 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:32,441 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:33,446 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:33,491 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:33,499 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:33,552 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-21 10:28:33,552 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:33,650 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-21 10:28:33,652 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:33,653 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 10, 8, 8] total 25 [2018-01-21 10:28:33,653 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:33,654 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-21 10:28:33,654 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-21 10:28:33,654 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=438, Unknown=0, NotChecked=0, Total=600 [2018-01-21 10:28:33,655 INFO L87 Difference]: Start difference. First operand 105 states and 114 transitions. Second operand 13 states. [2018-01-21 10:28:33,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:33,867 INFO L93 Difference]: Finished difference Result 234 states and 263 transitions. [2018-01-21 10:28:33,867 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 10:28:33,867 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 146 [2018-01-21 10:28:33,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:33,870 INFO L225 Difference]: With dead ends: 234 [2018-01-21 10:28:33,870 INFO L226 Difference]: Without dead ends: 222 [2018-01-21 10:28:33,871 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 594 GetRequests, 566 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=602, Unknown=0, NotChecked=0, Total=812 [2018-01-21 10:28:33,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-01-21 10:28:33,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 146. [2018-01-21 10:28:33,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2018-01-21 10:28:33,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 163 transitions. [2018-01-21 10:28:33,885 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 163 transitions. Word has length 146 [2018-01-21 10:28:33,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:33,885 INFO L432 AbstractCegarLoop]: Abstraction has 146 states and 163 transitions. [2018-01-21 10:28:33,885 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-21 10:28:33,885 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 163 transitions. [2018-01-21 10:28:33,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-01-21 10:28:33,887 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:33,887 INFO L322 BasicCegarLoop]: trace histogram [24, 18, 18, 18, 18, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:33,887 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:33,887 INFO L82 PathProgramCache]: Analyzing trace with hash 1755240795, now seen corresponding path program 7 times [2018-01-21 10:28:33,887 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:33,888 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:33,888 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:28:33,888 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:33,888 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:33,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:33,918 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:34,074 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 10:28:34,074 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:34,074 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:34,074 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:34,075 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:34,075 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:34,075 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:34,086 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:34,087 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:28:34,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:34,133 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:34,278 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 761 proven. 38 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2018-01-21 10:28:34,278 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:34,479 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 383 proven. 139 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2018-01-21 10:28:34,501 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:34,501 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:34,513 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:34,513 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:28:34,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:34,605 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:34,628 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 761 proven. 38 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2018-01-21 10:28:34,628 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:34,765 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 383 proven. 139 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2018-01-21 10:28:34,767 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:34,767 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13, 13, 13, 13] total 25 [2018-01-21 10:28:34,767 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:34,767 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 10:28:34,767 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 10:28:34,768 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2018-01-21 10:28:34,768 INFO L87 Difference]: Start difference. First operand 146 states and 163 transitions. Second operand 20 states. [2018-01-21 10:28:35,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:35,080 INFO L93 Difference]: Finished difference Result 370 states and 422 transitions. [2018-01-21 10:28:35,080 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 10:28:35,080 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 189 [2018-01-21 10:28:35,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:35,082 INFO L225 Difference]: With dead ends: 370 [2018-01-21 10:28:35,082 INFO L226 Difference]: Without dead ends: 296 [2018-01-21 10:28:35,083 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 774 GetRequests, 726 SyntacticMatches, 14 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 402 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=244, Invalid=1016, Unknown=0, NotChecked=0, Total=1260 [2018-01-21 10:28:35,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2018-01-21 10:28:35,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 184. [2018-01-21 10:28:35,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-01-21 10:28:35,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 204 transitions. [2018-01-21 10:28:35,097 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 204 transitions. Word has length 189 [2018-01-21 10:28:35,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:35,097 INFO L432 AbstractCegarLoop]: Abstraction has 184 states and 204 transitions. [2018-01-21 10:28:35,097 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 10:28:35,097 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 204 transitions. [2018-01-21 10:28:35,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 233 [2018-01-21 10:28:35,100 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:35,100 INFO L322 BasicCegarLoop]: trace histogram [31, 24, 24, 24, 24, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:35,100 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:35,100 INFO L82 PathProgramCache]: Analyzing trace with hash 519411977, now seen corresponding path program 8 times [2018-01-21 10:28:35,100 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:35,101 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:35,101 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:35,101 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:35,101 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:35,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:35,128 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:35,309 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1842 trivial. 0 not checked. [2018-01-21 10:28:35,310 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:35,310 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:35,310 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:35,310 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:35,310 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:35,310 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:35,315 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:28:35,315 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:28:35,331 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:35,357 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:35,362 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:35,366 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:35,461 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 1178 proven. 21 refuted. 0 times theorem prover too weak. 804 trivial. 0 not checked. [2018-01-21 10:28:35,462 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:35,639 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 257 proven. 309 refuted. 0 times theorem prover too weak. 1437 trivial. 0 not checked. [2018-01-21 10:28:35,659 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:35,660 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:35,662 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:28:35,663 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:28:35,682 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:35,727 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:35,762 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:35,770 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:35,805 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 1178 proven. 21 refuted. 0 times theorem prover too weak. 804 trivial. 0 not checked. [2018-01-21 10:28:35,805 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:36,023 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 257 proven. 309 refuted. 0 times theorem prover too weak. 1437 trivial. 0 not checked. [2018-01-21 10:28:36,026 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:36,026 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11, 11, 11] total 23 [2018-01-21 10:28:36,026 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:36,026 INFO L409 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-01-21 10:28:36,027 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-01-21 10:28:36,027 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=402, Unknown=0, NotChecked=0, Total=506 [2018-01-21 10:28:36,027 INFO L87 Difference]: Start difference. First operand 184 states and 204 transitions. Second operand 19 states. [2018-01-21 10:28:36,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:36,281 INFO L93 Difference]: Finished difference Result 330 states and 362 transitions. [2018-01-21 10:28:36,281 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-21 10:28:36,281 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 232 [2018-01-21 10:28:36,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:36,282 INFO L225 Difference]: With dead ends: 330 [2018-01-21 10:28:36,283 INFO L226 Difference]: Without dead ends: 248 [2018-01-21 10:28:36,283 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 [2018-01-21 10:28:36,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2018-01-21 10:28:36,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 183. [2018-01-21 10:28:36,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-01-21 10:28:36,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 202 transitions. [2018-01-21 10:28:36,296 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 202 transitions. Word has length 232 [2018-01-21 10:28:36,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:36,296 INFO L432 AbstractCegarLoop]: Abstraction has 183 states and 202 transitions. [2018-01-21 10:28:36,296 INFO L433 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-01-21 10:28:36,296 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 202 transitions. [2018-01-21 10:28:36,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-01-21 10:28:36,299 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:36,299 INFO L322 BasicCegarLoop]: trace histogram [38, 30, 30, 30, 30, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:36,299 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:36,299 INFO L82 PathProgramCache]: Analyzing trace with hash -881233501, now seen corresponding path program 9 times [2018-01-21 10:28:36,299 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:36,300 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:36,300 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:28:36,300 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:36,300 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:36,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:36,328 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:36,522 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-01-21 10:28:36,523 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:36,523 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:36,523 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:36,523 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:36,523 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:36,523 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:36,528 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:28:36,528 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:28:36,546 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:36,550 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:36,554 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:36,559 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:36,565 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:36,571 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:36,576 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:36,577 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:36,582 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:36,690 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-21 10:28:36,690 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:36,949 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-21 10:28:36,970 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:36,970 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:36,973 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:28:36,973 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:28:36,998 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:37,007 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:37,020 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:37,042 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:37,077 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:37,145 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:37,455 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:37,480 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:37,491 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:37,549 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-21 10:28:37,549 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:37,814 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-21 10:28:37,816 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:37,816 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 27 [2018-01-21 10:28:37,816 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:37,817 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 10:28:37,817 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 10:28:37,817 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=517, Unknown=0, NotChecked=0, Total=702 [2018-01-21 10:28:37,817 INFO L87 Difference]: Start difference. First operand 183 states and 202 transitions. Second operand 18 states. [2018-01-21 10:28:38,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:38,099 INFO L93 Difference]: Finished difference Result 420 states and 476 transitions. [2018-01-21 10:28:38,099 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-01-21 10:28:38,099 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 275 [2018-01-21 10:28:38,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:38,103 INFO L225 Difference]: With dead ends: 420 [2018-01-21 10:28:38,103 INFO L226 Difference]: Without dead ends: 408 [2018-01-21 10:28:38,104 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1115 GetRequests, 1082 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=281, Invalid=775, Unknown=0, NotChecked=0, Total=1056 [2018-01-21 10:28:38,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2018-01-21 10:28:38,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 234. [2018-01-21 10:28:38,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 234 states. [2018-01-21 10:28:38,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 264 transitions. [2018-01-21 10:28:38,125 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 264 transitions. Word has length 275 [2018-01-21 10:28:38,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:38,125 INFO L432 AbstractCegarLoop]: Abstraction has 234 states and 264 transitions. [2018-01-21 10:28:38,126 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 10:28:38,126 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 264 transitions. [2018-01-21 10:28:38,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2018-01-21 10:28:38,128 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:38,129 INFO L322 BasicCegarLoop]: trace histogram [48, 39, 39, 39, 39, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:38,129 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:38,129 INFO L82 PathProgramCache]: Analyzing trace with hash 2119777693, now seen corresponding path program 10 times [2018-01-21 10:28:38,129 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:38,130 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:38,130 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:28:38,130 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:38,131 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:38,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:38,173 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:38,620 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 4623 trivial. 0 not checked. [2018-01-21 10:28:38,620 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:38,620 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:38,620 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:38,621 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:38,621 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:38,621 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:38,626 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:28:38,626 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:28:38,709 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:38,718 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:39,039 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 3005 proven. 87 refuted. 0 times theorem prover too weak. 1801 trivial. 0 not checked. [2018-01-21 10:28:39,039 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:39,562 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1025 proven. 505 refuted. 0 times theorem prover too weak. 3363 trivial. 0 not checked. [2018-01-21 10:28:39,596 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:39,596 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:39,600 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:28:39,600 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:28:39,742 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:39,751 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:39,805 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 3005 proven. 87 refuted. 0 times theorem prover too weak. 1801 trivial. 0 not checked. [2018-01-21 10:28:39,805 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:40,048 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1025 proven. 505 refuted. 0 times theorem prover too weak. 3363 trivial. 0 not checked. [2018-01-21 10:28:40,050 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:40,050 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17, 17, 17, 17] total 34 [2018-01-21 10:28:40,050 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:40,051 INFO L409 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-01-21 10:28:40,051 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-01-21 10:28:40,051 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=913, Unknown=0, NotChecked=0, Total=1122 [2018-01-21 10:28:40,052 INFO L87 Difference]: Start difference. First operand 234 states and 264 transitions. Second operand 27 states. [2018-01-21 10:28:40,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:40,481 INFO L93 Difference]: Finished difference Result 592 states and 676 transitions. [2018-01-21 10:28:40,481 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-21 10:28:40,482 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 333 [2018-01-21 10:28:40,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:40,484 INFO L225 Difference]: With dead ends: 592 [2018-01-21 10:28:40,484 INFO L226 Difference]: Without dead ends: 495 [2018-01-21 10:28:40,486 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1358 GetRequests, 1292 SyntacticMatches, 18 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 812 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=445, Invalid=2005, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 10:28:40,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 495 states. [2018-01-21 10:28:40,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 495 to 282. [2018-01-21 10:28:40,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 282 states. [2018-01-21 10:28:40,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 316 transitions. [2018-01-21 10:28:40,503 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 316 transitions. Word has length 333 [2018-01-21 10:28:40,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:40,503 INFO L432 AbstractCegarLoop]: Abstraction has 282 states and 316 transitions. [2018-01-21 10:28:40,503 INFO L433 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-01-21 10:28:40,503 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 316 transitions. [2018-01-21 10:28:40,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 392 [2018-01-21 10:28:40,505 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:40,505 INFO L322 BasicCegarLoop]: trace histogram [58, 48, 48, 48, 48, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:40,505 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:40,506 INFO L82 PathProgramCache]: Analyzing trace with hash -1106394585, now seen corresponding path program 11 times [2018-01-21 10:28:40,506 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:40,506 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:40,506 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:28:40,507 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:40,507 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:40,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:40,539 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:40,838 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 0 proven. 335 refuted. 0 times theorem prover too weak. 6870 trivial. 0 not checked. [2018-01-21 10:28:40,838 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:40,838 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:40,838 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:40,838 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:40,838 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:40,838 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:40,843 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:28:40,843 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:28:40,868 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:40,874 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:40,883 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:40,892 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:40,902 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:40,914 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:40,926 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:40,928 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:40,936 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:41,458 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 4140 proven. 307 refuted. 0 times theorem prover too weak. 2758 trivial. 0 not checked. [2018-01-21 10:28:41,458 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:41,870 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 707 proven. 1488 refuted. 0 times theorem prover too weak. 5010 trivial. 0 not checked. [2018-01-21 10:28:41,891 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:41,891 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:41,895 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:28:41,896 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:28:41,922 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:41,930 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:41,950 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:41,987 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:42,034 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:42,575 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:42,743 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:42,779 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:42,790 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:42,869 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 4140 proven. 307 refuted. 0 times theorem prover too weak. 2758 trivial. 0 not checked. [2018-01-21 10:28:42,869 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:43,149 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 707 proven. 1488 refuted. 0 times theorem prover too weak. 5010 trivial. 0 not checked. [2018-01-21 10:28:43,152 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:43,152 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 17, 17, 17, 17] total 36 [2018-01-21 10:28:43,152 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:43,153 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-21 10:28:43,154 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-21 10:28:43,154 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=1062, Unknown=0, NotChecked=0, Total=1260 [2018-01-21 10:28:43,154 INFO L87 Difference]: Start difference. First operand 282 states and 316 transitions. Second operand 28 states. [2018-01-21 10:28:44,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:44,011 INFO L93 Difference]: Finished difference Result 640 states and 719 transitions. [2018-01-21 10:28:44,012 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-21 10:28:44,012 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 391 [2018-01-21 10:28:44,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:44,014 INFO L225 Difference]: With dead ends: 640 [2018-01-21 10:28:44,014 INFO L226 Difference]: Without dead ends: 345 [2018-01-21 10:28:44,016 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1601 GetRequests, 1523 SyntacticMatches, 18 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=623, Invalid=3159, Unknown=0, NotChecked=0, Total=3782 [2018-01-21 10:28:44,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 345 states. [2018-01-21 10:28:44,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 345 to 281. [2018-01-21 10:28:44,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 281 states. [2018-01-21 10:28:44,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 307 transitions. [2018-01-21 10:28:44,034 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 307 transitions. Word has length 391 [2018-01-21 10:28:44,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:44,034 INFO L432 AbstractCegarLoop]: Abstraction has 281 states and 307 transitions. [2018-01-21 10:28:44,034 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-21 10:28:44,034 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 307 transitions. [2018-01-21 10:28:44,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 445 [2018-01-21 10:28:44,037 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:44,037 INFO L322 BasicCegarLoop]: trace histogram [67, 56, 56, 56, 56, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:44,037 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:44,037 INFO L82 PathProgramCache]: Analyzing trace with hash -785380599, now seen corresponding path program 12 times [2018-01-21 10:28:44,037 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:44,038 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:44,038 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:28:44,038 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:44,038 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:44,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:44,073 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:44,760 INFO L134 CoverageAnalysis]: Checked inductivity of 9669 backedges. 0 proven. 407 refuted. 0 times theorem prover too weak. 9262 trivial. 0 not checked. [2018-01-21 10:28:44,760 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:44,760 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:44,760 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:44,760 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:44,760 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:44,761 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:44,766 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:28:44,766 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:28:44,792 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:44,807 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:44,817 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:44,827 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:44,832 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:44,839 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:44,846 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:44,863 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:44,878 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:44,901 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:44,948 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:44,965 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:44,999 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:45,020 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:45,074 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:45,112 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:45,162 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:45,165 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:45,172 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:45,439 INFO L134 CoverageAnalysis]: Checked inductivity of 9669 backedges. 2065 proven. 119 refuted. 0 times theorem prover too weak. 7485 trivial. 0 not checked. [2018-01-21 10:28:45,440 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:45,977 INFO L134 CoverageAnalysis]: Checked inductivity of 9669 backedges. 2065 proven. 119 refuted. 0 times theorem prover too weak. 7485 trivial. 0 not checked. [2018-01-21 10:28:45,998 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:45,998 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:46,001 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:28:46,001 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:28:46,034 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:46,044 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:46,066 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:46,101 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:46,174 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:51,958 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:53,410 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:58,742 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:10,790 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:22,861 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