java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-64bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/string_false-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-26 22:18:15,227 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-26 22:18:15,230 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-26 22:18:15,243 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-26 22:18:15,244 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-26 22:18:15,245 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-26 22:18:15,246 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-26 22:18:15,249 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-26 22:18:15,252 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-26 22:18:15,253 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-26 22:18:15,253 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-26 22:18:15,254 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-26 22:18:15,255 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-26 22:18:15,256 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-26 22:18:15,257 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-26 22:18:15,258 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-26 22:18:15,259 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-26 22:18:15,261 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-26 22:18:15,263 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-26 22:18:15,265 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-26 22:18:15,266 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-26 22:18:15,267 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-26 22:18:15,270 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-26 22:18:15,270 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-26 22:18:15,270 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-26 22:18:15,271 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-26 22:18:15,273 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-26 22:18:15,273 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-26 22:18:15,274 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-26 22:18:15,278 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-26 22:18:15,278 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-26 22:18:15,279 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-26 22:18:15,284 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-64bit-Automizer_Default.epf [2018-10-26 22:18:15,309 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-26 22:18:15,310 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-26 22:18:15,310 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-26 22:18:15,311 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-26 22:18:15,311 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-26 22:18:15,311 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-26 22:18:15,312 INFO L133 SettingsManager]: * Use SBE=true [2018-10-26 22:18:15,312 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-26 22:18:15,312 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-26 22:18:15,312 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-26 22:18:15,313 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-26 22:18:15,313 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-26 22:18:15,313 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-26 22:18:15,313 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-26 22:18:15,313 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-26 22:18:15,313 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-26 22:18:15,314 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-26 22:18:15,314 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-26 22:18:15,314 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-26 22:18:15,314 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-26 22:18:15,315 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-26 22:18:15,315 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-26 22:18:15,315 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-26 22:18:15,315 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-26 22:18:15,315 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-26 22:18:15,315 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-26 22:18:15,316 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-26 22:18:15,316 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-26 22:18:15,364 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-26 22:18:15,379 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-26 22:18:15,383 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-26 22:18:15,385 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-26 22:18:15,386 INFO L276 PluginConnector]: CDTParser initialized [2018-10-26 22:18:15,386 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops/string_false-unreach-call_true-termination.i [2018-10-26 22:18:15,453 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/194aeb865/56032376286048d9b8ca29b204f2be26/FLAGe1da679ed [2018-10-26 22:18:15,921 INFO L298 CDTParser]: Found 1 translation units. [2018-10-26 22:18:15,921 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string_false-unreach-call_true-termination.i [2018-10-26 22:18:15,928 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/194aeb865/56032376286048d9b8ca29b204f2be26/FLAGe1da679ed [2018-10-26 22:18:15,943 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/194aeb865/56032376286048d9b8ca29b204f2be26 [2018-10-26 22:18:15,953 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-26 22:18:15,954 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-26 22:18:15,955 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-26 22:18:15,956 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-26 22:18:15,959 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-26 22:18:15,961 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 10:18:15" (1/1) ... [2018-10-26 22:18:15,964 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@441f49ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:18:15, skipping insertion in model container [2018-10-26 22:18:15,964 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 10:18:15" (1/1) ... [2018-10-26 22:18:15,976 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-26 22:18:15,997 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-26 22:18:16,212 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-26 22:18:16,220 INFO L189 MainTranslator]: Completed pre-run [2018-10-26 22:18:16,259 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-26 22:18:16,290 INFO L193 MainTranslator]: Completed translation [2018-10-26 22:18:16,291 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:18:16 WrapperNode [2018-10-26 22:18:16,291 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-26 22:18:16,292 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-26 22:18:16,292 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-26 22:18:16,292 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-26 22:18:16,304 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:18:16" (1/1) ... [2018-10-26 22:18:16,317 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:18:16" (1/1) ... [2018-10-26 22:18:16,353 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-26 22:18:16,353 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-26 22:18:16,353 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-26 22:18:16,353 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-26 22:18:16,367 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:18:16" (1/1) ... [2018-10-26 22:18:16,368 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:18:16" (1/1) ... [2018-10-26 22:18:16,370 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:18:16" (1/1) ... [2018-10-26 22:18:16,371 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:18:16" (1/1) ... [2018-10-26 22:18:16,389 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:18:16" (1/1) ... [2018-10-26 22:18:16,403 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:18:16" (1/1) ... [2018-10-26 22:18:16,405 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:18:16" (1/1) ... [2018-10-26 22:18:16,415 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-26 22:18:16,416 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-26 22:18:16,416 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-26 22:18:16,416 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-26 22:18:16,417 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:18:16" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-26 22:18:16,620 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2018-10-26 22:18:16,620 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-10-26 22:18:16,621 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-26 22:18:16,621 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-26 22:18:16,621 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2018-10-26 22:18:16,621 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-10-26 22:18:17,187 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-26 22:18:17,188 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 10:18:17 BoogieIcfgContainer [2018-10-26 22:18:17,188 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-26 22:18:17,189 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-26 22:18:17,189 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-26 22:18:17,192 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-26 22:18:17,192 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.10 10:18:15" (1/3) ... [2018-10-26 22:18:17,193 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35c0bbf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.10 10:18:17, skipping insertion in model container [2018-10-26 22:18:17,193 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:18:16" (2/3) ... [2018-10-26 22:18:17,193 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35c0bbf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.10 10:18:17, skipping insertion in model container [2018-10-26 22:18:17,194 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 10:18:17" (3/3) ... [2018-10-26 22:18:17,196 INFO L112 eAbstractionObserver]: Analyzing ICFG string_false-unreach-call_true-termination.i [2018-10-26 22:18:17,206 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-26 22:18:17,215 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-26 22:18:17,234 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-26 22:18:17,265 INFO L135 ementStrategyFactory]: Using default assertion order modulation [2018-10-26 22:18:17,265 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-26 22:18:17,265 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-26 22:18:17,266 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-26 22:18:17,266 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-26 22:18:17,266 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-26 22:18:17,266 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-26 22:18:17,266 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-26 22:18:17,266 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-26 22:18:17,282 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states. [2018-10-26 22:18:17,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-26 22:18:17,289 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:18:17,290 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 22:18:17,293 INFO L424 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:18:17,299 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:18:17,300 INFO L82 PathProgramCache]: Analyzing trace with hash 777437931, now seen corresponding path program 1 times [2018-10-26 22:18:17,301 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:18:17,302 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:18:17,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:18:17,349 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 22:18:17,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:18:17,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:18:17,424 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:18:17,427 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-26 22:18:17,428 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-26 22:18:17,432 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-26 22:18:17,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-26 22:18:17,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-26 22:18:17,449 INFO L87 Difference]: Start difference. First operand 56 states. Second operand 2 states. [2018-10-26 22:18:17,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:18:17,471 INFO L93 Difference]: Finished difference Result 102 states and 128 transitions. [2018-10-26 22:18:17,471 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-26 22:18:17,472 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 19 [2018-10-26 22:18:17,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:18:17,483 INFO L225 Difference]: With dead ends: 102 [2018-10-26 22:18:17,483 INFO L226 Difference]: Without dead ends: 36 [2018-10-26 22:18:17,487 INFO L605 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 [2018-10-26 22:18:17,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-26 22:18:17,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-26 22:18:17,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-26 22:18:17,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2018-10-26 22:18:17,523 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 19 [2018-10-26 22:18:17,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:18:17,523 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2018-10-26 22:18:17,523 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-26 22:18:17,523 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2018-10-26 22:18:17,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-26 22:18:17,524 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:18:17,525 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 22:18:17,525 INFO L424 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:18:17,525 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:18:17,525 INFO L82 PathProgramCache]: Analyzing trace with hash 1306036578, now seen corresponding path program 1 times [2018-10-26 22:18:17,526 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:18:17,526 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:18:17,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:18:17,527 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 22:18:17,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:18:17,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:18:17,592 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:18:17,593 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-26 22:18:17,593 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-26 22:18:17,595 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-26 22:18:17,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-26 22:18:17,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-26 22:18:17,596 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 3 states. [2018-10-26 22:18:17,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:18:17,782 INFO L93 Difference]: Finished difference Result 81 states and 93 transitions. [2018-10-26 22:18:17,783 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-26 22:18:17,783 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2018-10-26 22:18:17,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:18:17,787 INFO L225 Difference]: With dead ends: 81 [2018-10-26 22:18:17,787 INFO L226 Difference]: Without dead ends: 55 [2018-10-26 22:18:17,789 INFO L605 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 [2018-10-26 22:18:17,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-26 22:18:17,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 40. [2018-10-26 22:18:17,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-26 22:18:17,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 45 transitions. [2018-10-26 22:18:17,800 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 45 transitions. Word has length 26 [2018-10-26 22:18:17,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:18:17,801 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 45 transitions. [2018-10-26 22:18:17,801 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-26 22:18:17,801 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 45 transitions. [2018-10-26 22:18:17,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-26 22:18:17,803 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:18:17,804 INFO L375 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] [2018-10-26 22:18:17,804 INFO L424 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:18:17,804 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:18:17,804 INFO L82 PathProgramCache]: Analyzing trace with hash -373199200, now seen corresponding path program 1 times [2018-10-26 22:18:17,805 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:18:17,805 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:18:17,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:18:17,806 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 22:18:17,807 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:18:17,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:18:17,931 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-26 22:18:17,932 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:18:17,932 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-26 22:18:17,951 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 22:18:17,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:18:18,006 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:18:18,053 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-26 22:18:18,077 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:18:18,077 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2018-10-26 22:18:18,078 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-26 22:18:18,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-26 22:18:18,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-10-26 22:18:18,079 INFO L87 Difference]: Start difference. First operand 40 states and 45 transitions. Second operand 5 states. [2018-10-26 22:18:18,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:18:18,486 INFO L93 Difference]: Finished difference Result 102 states and 115 transitions. [2018-10-26 22:18:18,487 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-26 22:18:18,487 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 36 [2018-10-26 22:18:18,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:18:18,488 INFO L225 Difference]: With dead ends: 102 [2018-10-26 22:18:18,488 INFO L226 Difference]: Without dead ends: 74 [2018-10-26 22:18:18,489 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-10-26 22:18:18,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-26 22:18:18,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 50. [2018-10-26 22:18:18,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-26 22:18:18,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2018-10-26 22:18:18,498 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 36 [2018-10-26 22:18:18,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:18:18,498 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2018-10-26 22:18:18,498 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-26 22:18:18,498 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2018-10-26 22:18:18,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-26 22:18:18,500 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:18:18,500 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 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] [2018-10-26 22:18:18,500 INFO L424 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:18:18,501 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:18:18,501 INFO L82 PathProgramCache]: Analyzing trace with hash -1086815326, now seen corresponding path program 2 times [2018-10-26 22:18:18,501 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:18:18,501 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:18:18,502 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:18:18,503 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 22:18:18,503 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:18:18,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:18:18,701 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-26 22:18:18,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:18:18,701 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 22:18:18,717 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-26 22:18:18,767 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-26 22:18:18,767 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 22:18:18,770 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:18:18,819 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-26 22:18:18,853 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:18:18,853 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2018-10-26 22:18:18,854 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-26 22:18:18,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-26 22:18:18,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-26 22:18:18,855 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand 6 states. [2018-10-26 22:18:19,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:18:19,053 INFO L93 Difference]: Finished difference Result 126 states and 140 transitions. [2018-10-26 22:18:19,053 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-26 22:18:19,053 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 46 [2018-10-26 22:18:19,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:18:19,055 INFO L225 Difference]: With dead ends: 126 [2018-10-26 22:18:19,055 INFO L226 Difference]: Without dead ends: 93 [2018-10-26 22:18:19,056 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-26 22:18:19,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-10-26 22:18:19,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 60. [2018-10-26 22:18:19,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-26 22:18:19,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2018-10-26 22:18:19,064 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 46 [2018-10-26 22:18:19,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:18:19,065 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2018-10-26 22:18:19,065 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-26 22:18:19,065 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2018-10-26 22:18:19,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-26 22:18:19,067 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:18:19,067 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 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, 1, 1, 1, 1] [2018-10-26 22:18:19,068 INFO L424 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:18:19,068 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:18:19,068 INFO L82 PathProgramCache]: Analyzing trace with hash -90815648, now seen corresponding path program 3 times [2018-10-26 22:18:19,068 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:18:19,068 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:18:19,069 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:18:19,070 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 22:18:19,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:18:19,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:18:19,320 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-10-26 22:18:19,321 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:18:19,321 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-26 22:18:19,341 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 22:18:19,432 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-26 22:18:19,432 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 22:18:19,437 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:18:19,552 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-10-26 22:18:19,575 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:18:19,575 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2018-10-26 22:18:19,575 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-26 22:18:19,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-26 22:18:19,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-26 22:18:19,576 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand 7 states. [2018-10-26 22:18:19,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:18:19,798 INFO L93 Difference]: Finished difference Result 150 states and 165 transitions. [2018-10-26 22:18:19,798 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-26 22:18:19,798 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 56 [2018-10-26 22:18:19,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:18:19,800 INFO L225 Difference]: With dead ends: 150 [2018-10-26 22:18:19,800 INFO L226 Difference]: Without dead ends: 112 [2018-10-26 22:18:19,801 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-26 22:18:19,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-10-26 22:18:19,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 70. [2018-10-26 22:18:19,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-10-26 22:18:19,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 75 transitions. [2018-10-26 22:18:19,809 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 75 transitions. Word has length 56 [2018-10-26 22:18:19,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:18:19,810 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 75 transitions. [2018-10-26 22:18:19,810 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-26 22:18:19,810 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 75 transitions. [2018-10-26 22:18:19,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-10-26 22:18:19,812 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:18:19,812 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 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, 1, 1, 1, 1] [2018-10-26 22:18:19,812 INFO L424 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:18:19,813 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:18:19,813 INFO L82 PathProgramCache]: Analyzing trace with hash -1452782110, now seen corresponding path program 4 times [2018-10-26 22:18:19,813 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:18:19,813 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:18:19,814 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:18:19,814 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 22:18:19,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:18:19,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:18:19,989 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2018-10-26 22:18:19,989 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:18:19,989 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-26 22:18:19,997 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 22:18:20,033 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 22:18:20,033 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 22:18:20,037 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:18:20,071 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2018-10-26 22:18:20,092 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:18:20,093 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2018-10-26 22:18:20,093 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-26 22:18:20,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-26 22:18:20,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-26 22:18:20,094 INFO L87 Difference]: Start difference. First operand 70 states and 75 transitions. Second operand 8 states. [2018-10-26 22:18:20,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:18:20,895 INFO L93 Difference]: Finished difference Result 168 states and 184 transitions. [2018-10-26 22:18:20,896 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-26 22:18:20,896 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 66 [2018-10-26 22:18:20,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:18:20,899 INFO L225 Difference]: With dead ends: 168 [2018-10-26 22:18:20,900 INFO L226 Difference]: Without dead ends: 125 [2018-10-26 22:18:20,901 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-26 22:18:20,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2018-10-26 22:18:20,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 80. [2018-10-26 22:18:20,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-10-26 22:18:20,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 85 transitions. [2018-10-26 22:18:20,915 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 85 transitions. Word has length 66 [2018-10-26 22:18:20,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:18:20,916 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 85 transitions. [2018-10-26 22:18:20,917 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-26 22:18:20,917 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 85 transitions. [2018-10-26 22:18:20,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-26 22:18:20,918 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:18:20,918 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 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, 1, 1, 1, 1] [2018-10-26 22:18:20,918 INFO L424 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:18:20,919 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:18:20,919 INFO L82 PathProgramCache]: Analyzing trace with hash 2042873888, now seen corresponding path program 5 times [2018-10-26 22:18:20,919 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:18:20,919 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:18:20,920 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:18:20,920 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 22:18:20,920 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:18:20,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-26 22:18:21,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-26 22:18:21,057 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-10-26 22:18:21,127 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.10 10:18:21 BoogieIcfgContainer [2018-10-26 22:18:21,127 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-26 22:18:21,128 INFO L168 Benchmark]: Toolchain (without parser) took 5174.67 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 788.0 MB). Free memory was 1.4 GB in the beginning and 2.0 GB in the end (delta: -603.7 MB). Peak memory consumption was 184.3 MB. Max. memory is 7.1 GB. [2018-10-26 22:18:21,130 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-26 22:18:21,131 INFO L168 Benchmark]: CACSL2BoogieTranslator took 336.36 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-26 22:18:21,132 INFO L168 Benchmark]: Boogie Procedure Inliner took 60.73 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-26 22:18:21,133 INFO L168 Benchmark]: Boogie Preprocessor took 62.17 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-26 22:18:21,134 INFO L168 Benchmark]: RCFGBuilder took 772.54 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 788.0 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -819.8 MB). Peak memory consumption was 15.6 MB. Max. memory is 7.1 GB. [2018-10-26 22:18:21,135 INFO L168 Benchmark]: TraceAbstraction took 3938.26 ms. Allocated memory is still 2.3 GB. Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 205.6 MB). Peak memory consumption was 205.6 MB. Max. memory is 7.1 GB. [2018-10-26 22:18:21,139 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 336.36 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 60.73 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 62.17 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 772.54 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 788.0 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -819.8 MB). Peak memory consumption was 15.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3938.26 ms. Allocated memory is still 2.3 GB. Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 205.6 MB). Peak memory consumption was 205.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 6]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 55. Possible FailurePath: [L17] FCALL char string_A[5], string_B[5]; [L18] int i, j, nc_A, nc_B, found=0; [L21] i=0 [L21] COND TRUE i<5 [L22] FCALL string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] FCALL string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] FCALL string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] FCALL string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] FCALL string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND FALSE !(i<5) [L23] EXPR, FCALL string_A[5 -1] [L23] COND FALSE !(!(string_A[5 -1]=='\0')) [L25] i=0 [L25] COND TRUE i<5 [L26] FCALL string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] FCALL string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] FCALL string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] FCALL string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] FCALL string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND FALSE !(i<5) [L27] EXPR, FCALL string_B[5 -1] [L27] COND FALSE !(!(string_B[5 -1]=='\0')) [L29] nc_A = 0 [L30] EXPR, FCALL string_A[nc_A] [L30] COND FALSE !(string_A[nc_A]!='\0') [L33] nc_B = 0 [L34] EXPR, FCALL string_B[nc_B] [L34] COND FALSE !(string_B[nc_B]!='\0') [L37] COND FALSE !(!(nc_B >= nc_A)) [L40] EXPR j=0 [L40] i=j=0 [L41] COND FALSE !((inc_B-1)<