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/invert_string_false-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 11:45:01,902 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 11:45:01,904 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 11:45:01,918 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 11:45:01,918 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 11:45:01,920 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 11:45:01,921 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 11:45:01,923 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 11:45:01,925 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 11:45:01,926 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 11:45:01,927 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-10-24 11:45:01,954 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 [2018-10-24 11:45:01,970 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 11:45:01,970 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 11:45:01,971 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 11:45:01,972 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-24 11:45:01,972 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-24 11:45:01,972 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-24 11:45:01,973 INFO L133 SettingsManager]: * Use SBE=true [2018-10-24 11:45:01,973 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 11:45:01,973 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 11:45:01,973 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 11:45:01,974 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 11:45:01,974 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 11:45:01,974 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 11:45:01,974 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 11:45:01,974 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 11:45:01,975 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 11:45:01,975 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 11:45:01,975 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 11:45:01,975 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 11:45:01,976 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 11:45:01,976 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 11:45:01,976 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 11:45:01,976 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 11:45:01,976 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-24 11:45:01,977 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 11:45:01,977 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 11:45:01,977 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 11:45:01,977 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 11:45:02,030 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 11:45:02,044 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 11:45:02,051 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 11:45:02,052 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 11:45:02,053 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 11:45:02,054 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops/invert_string_false-unreach-call_true-termination.i [2018-10-24 11:45:02,125 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/282003188/22f7594ca5444453a3f1f2c57597917a/FLAGda54a2196 [2018-10-24 11:45:02,656 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 11:45:02,657 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string_false-unreach-call_true-termination.i [2018-10-24 11:45:02,664 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/282003188/22f7594ca5444453a3f1f2c57597917a/FLAGda54a2196 [2018-10-24 11:45:02,679 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/282003188/22f7594ca5444453a3f1f2c57597917a [2018-10-24 11:45:02,690 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 11:45:02,691 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 11:45:02,693 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 11:45:02,693 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 11:45:02,697 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 11:45:02,698 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:45:02" (1/1) ... [2018-10-24 11:45:02,701 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1652d08d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:45:02, skipping insertion in model container [2018-10-24 11:45:02,701 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:45:02" (1/1) ... [2018-10-24 11:45:02,712 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 11:45:02,733 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 11:45:02,946 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 11:45:02,950 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 11:45:02,978 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 11:45:03,003 INFO L193 MainTranslator]: Completed translation [2018-10-24 11:45:03,003 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:45:03 WrapperNode [2018-10-24 11:45:03,004 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 11:45:03,005 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 11:45:03,005 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 11:45:03,005 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 11:45:03,013 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:45:03" (1/1) ... [2018-10-24 11:45:03,023 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:45:03" (1/1) ... [2018-10-24 11:45:03,044 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 11:45:03,044 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 11:45:03,044 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 11:45:03,045 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 11:45:03,055 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:45:03" (1/1) ... [2018-10-24 11:45:03,055 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:45:03" (1/1) ... [2018-10-24 11:45:03,057 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:45:03" (1/1) ... [2018-10-24 11:45:03,057 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:45:03" (1/1) ... [2018-10-24 11:45:03,063 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:45:03" (1/1) ... [2018-10-24 11:45:03,070 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:45:03" (1/1) ... [2018-10-24 11:45:03,072 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:45:03" (1/1) ... [2018-10-24 11:45:03,074 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 11:45:03,075 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 11:45:03,075 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 11:45:03,075 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 11:45:03,076 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:45:03" (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 [2018-10-24 11:45:03,201 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2018-10-24 11:45:03,201 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-10-24 11:45:03,201 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 11:45:03,201 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 11:45:03,202 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2018-10-24 11:45:03,202 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-10-24 11:45:03,654 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 11:45:03,655 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:45:03 BoogieIcfgContainer [2018-10-24 11:45:03,655 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 11:45:03,656 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 11:45:03,657 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 11:45:03,660 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 11:45:03,660 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 11:45:02" (1/3) ... [2018-10-24 11:45:03,661 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48844ab8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:45:03, skipping insertion in model container [2018-10-24 11:45:03,662 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:45:03" (2/3) ... [2018-10-24 11:45:03,662 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48844ab8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:45:03, skipping insertion in model container [2018-10-24 11:45:03,662 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:45:03" (3/3) ... [2018-10-24 11:45:03,664 INFO L112 eAbstractionObserver]: Analyzing ICFG invert_string_false-unreach-call_true-termination.i [2018-10-24 11:45:03,674 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 11:45:03,682 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 11:45:03,697 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 11:45:03,729 INFO L135 ementStrategyFactory]: Using default assertion order modulation [2018-10-24 11:45:03,730 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 11:45:03,730 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 11:45:03,730 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 11:45:03,731 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 11:45:03,731 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 11:45:03,731 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 11:45:03,731 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 11:45:03,731 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 11:45:03,746 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states. [2018-10-24 11:45:03,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 11:45:03,753 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:45:03,754 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:45:03,757 INFO L424 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:45:03,763 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:45:03,763 INFO L82 PathProgramCache]: Analyzing trace with hash -73496645, now seen corresponding path program 1 times [2018-10-24 11:45:03,765 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:45:03,766 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:45:03,810 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:03,810 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:45:03,810 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:03,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:45:03,893 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:45:03,895 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 11:45:03,896 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 11:45:03,900 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 11:45:03,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 11:45:03,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 11:45:03,915 INFO L87 Difference]: Start difference. First operand 36 states. Second operand 2 states. [2018-10-24 11:45:03,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:45:03,935 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2018-10-24 11:45:03,936 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 11:45:03,937 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-10-24 11:45:03,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:45:03,948 INFO L225 Difference]: With dead ends: 62 [2018-10-24 11:45:03,949 INFO L226 Difference]: Without dead ends: 29 [2018-10-24 11:45:03,953 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 [2018-10-24 11:45:03,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-24 11:45:03,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-10-24 11:45:03,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-24 11:45:03,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2018-10-24 11:45:03,998 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 17 [2018-10-24 11:45:03,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:45:03,998 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2018-10-24 11:45:03,998 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 11:45:03,999 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2018-10-24 11:45:03,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-24 11:45:04,000 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:45:04,000 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:45:04,000 INFO L424 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:45:04,000 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:45:04,001 INFO L82 PathProgramCache]: Analyzing trace with hash 1050305296, now seen corresponding path program 1 times [2018-10-24 11:45:04,001 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:45:04,001 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:45:04,003 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:04,003 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:45:04,003 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:04,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:45:04,173 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:45:04,173 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 11:45:04,173 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-24 11:45:04,175 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 11:45:04,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 11:45:04,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-10-24 11:45:04,176 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 5 states. [2018-10-24 11:45:04,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:45:04,434 INFO L93 Difference]: Finished difference Result 48 states and 51 transitions. [2018-10-24 11:45:04,435 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 11:45:04,435 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2018-10-24 11:45:04,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:45:04,436 INFO L225 Difference]: With dead ends: 48 [2018-10-24 11:45:04,436 INFO L226 Difference]: Without dead ends: 35 [2018-10-24 11:45:04,438 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2018-10-24 11:45:04,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-10-24 11:45:04,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 31. [2018-10-24 11:45:04,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-24 11:45:04,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2018-10-24 11:45:04,447 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 19 [2018-10-24 11:45:04,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:45:04,448 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2018-10-24 11:45:04,448 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 11:45:04,448 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2018-10-24 11:45:04,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 11:45:04,449 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:45:04,449 INFO L375 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] [2018-10-24 11:45:04,450 INFO L424 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:45:04,451 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:45:04,451 INFO L82 PathProgramCache]: Analyzing trace with hash -324442504, now seen corresponding path program 1 times [2018-10-24 11:45:04,451 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:45:04,451 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:45:04,452 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:04,453 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:45:04,453 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:04,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:45:04,652 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:45:04,652 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 11:45:04,652 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-24 11:45:04,656 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 11:45:04,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 11:45:04,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 11:45:04,657 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 5 states. [2018-10-24 11:45:04,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:45:04,852 INFO L93 Difference]: Finished difference Result 67 states and 71 transitions. [2018-10-24 11:45:04,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 11:45:04,853 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2018-10-24 11:45:04,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:45:04,854 INFO L225 Difference]: With dead ends: 67 [2018-10-24 11:45:04,854 INFO L226 Difference]: Without dead ends: 46 [2018-10-24 11:45:04,855 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-10-24 11:45:04,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-24 11:45:04,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 33. [2018-10-24 11:45:04,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-24 11:45:04,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2018-10-24 11:45:04,860 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 25 [2018-10-24 11:45:04,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:45:04,860 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2018-10-24 11:45:04,861 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 11:45:04,861 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2018-10-24 11:45:04,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-24 11:45:04,862 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:45:04,862 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] [2018-10-24 11:45:04,862 INFO L424 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:45:04,862 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:45:04,863 INFO L82 PathProgramCache]: Analyzing trace with hash -177181982, now seen corresponding path program 1 times [2018-10-24 11:45:04,863 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:45:04,863 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:45:04,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:04,864 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:45:04,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:04,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:45:05,245 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 19 [2018-10-24 11:45:05,592 WARN L179 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 18 [2018-10-24 11:45:05,794 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2018-10-24 11:45:06,707 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:45:06,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:45:06,707 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 [2018-10-24 11:45:06,722 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:45:06,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:45:06,767 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:45:06,809 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2018-10-24 11:45:06,812 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-10-24 11:45:06,822 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 11:45:06,823 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:10, output treesize:9 [2018-10-24 11:45:06,846 INFO L700 Elim1Store]: detected not equals via solver [2018-10-24 11:45:06,873 INFO L700 Elim1Store]: detected not equals via solver [2018-10-24 11:45:06,875 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 4 [2018-10-24 11:45:06,875 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-10-24 11:45:06,893 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 11:45:06,894 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:17, output treesize:11 [2018-10-24 11:45:07,253 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 17 [2018-10-24 11:45:07,257 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2018-10-24 11:45:07,258 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 11:45:07,270 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 11:45:07,290 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-24 11:45:07,291 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:32, output treesize:28 [2018-10-24 11:45:07,415 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2018-10-24 11:45:07,423 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 5 [2018-10-24 11:45:07,423 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 11:45:07,434 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2018-10-24 11:45:07,434 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-10-24 11:45:07,440 INFO L267 ElimStorePlain]: Start of recursive call 2: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 11:45:07,448 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-24 11:45:07,448 INFO L202 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:30, output treesize:3 [2018-10-24 11:45:07,472 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:45:07,506 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:45:07,507 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 22 [2018-10-24 11:45:07,507 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 11:45:07,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 11:45:07,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2018-10-24 11:45:07,510 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 22 states. [2018-10-24 11:45:09,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:45:09,850 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2018-10-24 11:45:09,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 11:45:09,851 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 30 [2018-10-24 11:45:09,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:45:09,853 INFO L225 Difference]: With dead ends: 126 [2018-10-24 11:45:09,853 INFO L226 Difference]: Without dead ends: 124 [2018-10-24 11:45:09,855 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 21 SyntacticMatches, 6 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=530, Invalid=1362, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 11:45:09,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-24 11:45:09,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 55. [2018-10-24 11:45:09,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-10-24 11:45:09,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2018-10-24 11:45:09,868 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 30 [2018-10-24 11:45:09,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:45:09,868 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2018-10-24 11:45:09,869 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 11:45:09,869 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2018-10-24 11:45:09,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-24 11:45:09,871 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:45:09,871 INFO L375 BasicCegarLoop]: trace histogram [3, 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] [2018-10-24 11:45:09,871 INFO L424 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:45:09,872 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:45:09,872 INFO L82 PathProgramCache]: Analyzing trace with hash -649226056, now seen corresponding path program 2 times [2018-10-24 11:45:09,872 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:45:09,872 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:45:09,873 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:09,873 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:45:09,873 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:09,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:45:09,964 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:45:09,964 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:45:09,965 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 [2018-10-24 11:45:09,974 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:45:10,011 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:45:10,011 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:45:10,015 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:45:10,024 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:45:10,045 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:45:10,045 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2018-10-24 11:45:10,046 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 11:45:10,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 11:45:10,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-24 11:45:10,046 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand 6 states. [2018-10-24 11:45:10,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:45:10,246 INFO L93 Difference]: Finished difference Result 101 states and 107 transitions. [2018-10-24 11:45:10,247 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 11:45:10,247 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 35 [2018-10-24 11:45:10,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:45:10,249 INFO L225 Difference]: With dead ends: 101 [2018-10-24 11:45:10,249 INFO L226 Difference]: Without dead ends: 90 [2018-10-24 11:45:10,250 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2018-10-24 11:45:10,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-24 11:45:10,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 61. [2018-10-24 11:45:10,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-10-24 11:45:10,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 65 transitions. [2018-10-24 11:45:10,260 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 65 transitions. Word has length 35 [2018-10-24 11:45:10,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:45:10,261 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 65 transitions. [2018-10-24 11:45:10,261 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 11:45:10,261 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 65 transitions. [2018-10-24 11:45:10,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-24 11:45:10,262 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:45:10,263 INFO L375 BasicCegarLoop]: trace histogram [3, 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] [2018-10-24 11:45:10,263 INFO L424 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:45:10,263 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:45:10,263 INFO L82 PathProgramCache]: Analyzing trace with hash 1534773450, now seen corresponding path program 3 times [2018-10-24 11:45:10,263 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:45:10,264 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:45:10,264 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:10,265 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:45:10,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:10,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:45:10,383 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:45:10,384 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:45:10,384 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 [2018-10-24 11:45:10,401 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:45:10,426 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 11:45:10,426 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:45:10,430 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:45:10,436 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:45:10,458 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:45:10,458 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 7 [2018-10-24 11:45:10,458 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 11:45:10,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 11:45:10,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2018-10-24 11:45:10,459 INFO L87 Difference]: Start difference. First operand 61 states and 65 transitions. Second operand 7 states. [2018-10-24 11:45:10,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:45:10,686 INFO L93 Difference]: Finished difference Result 113 states and 118 transitions. [2018-10-24 11:45:10,687 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 11:45:10,687 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 36 [2018-10-24 11:45:10,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:45:10,688 INFO L225 Difference]: With dead ends: 113 [2018-10-24 11:45:10,688 INFO L226 Difference]: Without dead ends: 96 [2018-10-24 11:45:10,689 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2018-10-24 11:45:10,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-24 11:45:10,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 61. [2018-10-24 11:45:10,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-10-24 11:45:10,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2018-10-24 11:45:10,699 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 36 [2018-10-24 11:45:10,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:45:10,700 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2018-10-24 11:45:10,700 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 11:45:10,700 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2018-10-24 11:45:10,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-24 11:45:10,701 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:45:10,702 INFO L375 BasicCegarLoop]: trace histogram [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] [2018-10-24 11:45:10,702 INFO L424 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:45:10,702 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:45:10,702 INFO L82 PathProgramCache]: Analyzing trace with hash 1805230962, now seen corresponding path program 1 times [2018-10-24 11:45:10,703 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:45:10,703 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:45:10,704 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:10,704 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:45:10,704 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:10,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:45:10,789 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 11:45:10,789 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:45:10,789 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 [2018-10-24 11:45:10,797 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:45:10,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:45:10,819 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:45:10,981 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 11:45:11,002 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:45:11,003 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2018-10-24 11:45:11,003 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 11:45:11,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 11:45:11,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2018-10-24 11:45:11,004 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 11 states. [2018-10-24 11:45:11,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:45:11,276 INFO L93 Difference]: Finished difference Result 102 states and 105 transitions. [2018-10-24 11:45:11,276 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 11:45:11,277 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 38 [2018-10-24 11:45:11,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:45:11,277 INFO L225 Difference]: With dead ends: 102 [2018-10-24 11:45:11,278 INFO L226 Difference]: Without dead ends: 71 [2018-10-24 11:45:11,278 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2018-10-24 11:45:11,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2018-10-24 11:45:11,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 44. [2018-10-24 11:45:11,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-24 11:45:11,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2018-10-24 11:45:11,286 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 38 [2018-10-24 11:45:11,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:45:11,286 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2018-10-24 11:45:11,286 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 11:45:11,286 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2018-10-24 11:45:11,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-24 11:45:11,288 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:45:11,288 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 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] [2018-10-24 11:45:11,288 INFO L424 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:45:11,288 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:45:11,289 INFO L82 PathProgramCache]: Analyzing trace with hash -696795616, now seen corresponding path program 4 times [2018-10-24 11:45:11,289 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:45:11,289 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:45:11,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:11,290 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:45:11,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:11,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:45:12,152 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 29 [2018-10-24 11:45:12,526 WARN L179 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 26 [2018-10-24 11:45:12,645 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:45:12,645 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:45:12,645 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:45:12,653 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:45:12,681 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:45:12,681 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:45:12,685 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:45:12,706 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2018-10-24 11:45:12,707 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-10-24 11:45:12,776 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 11:45:12,776 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:10, output treesize:9 [2018-10-24 11:45:12,815 INFO L700 Elim1Store]: detected not equals via solver [2018-10-24 11:45:12,839 INFO L700 Elim1Store]: detected not equals via solver [2018-10-24 11:45:12,840 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 4 [2018-10-24 11:45:12,841 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-10-24 11:45:12,910 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 11:45:12,911 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:14, output treesize:8 [2018-10-24 11:45:13,336 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2018-10-24 11:45:13,339 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 13 [2018-10-24 11:45:13,339 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 11:45:13,342 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 11:45:13,353 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-24 11:45:13,353 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:31, output treesize:27 [2018-10-24 11:45:13,453 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2018-10-24 11:45:13,463 INFO L682 Elim1Store]: detected equality via solver [2018-10-24 11:45:13,464 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2018-10-24 11:45:13,464 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 11:45:13,471 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2018-10-24 11:45:13,472 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-10-24 11:45:13,474 INFO L267 ElimStorePlain]: Start of recursive call 2: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 11:45:13,481 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-24 11:45:13,482 INFO L202 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:40, output treesize:3 [2018-10-24 11:45:13,505 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:45:13,526 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:45:13,526 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 33 [2018-10-24 11:45:13,527 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 11:45:13,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 11:45:13,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=890, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 11:45:13,528 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 33 states. [2018-10-24 11:45:16,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:45:16,072 INFO L93 Difference]: Finished difference Result 168 states and 173 transitions. [2018-10-24 11:45:16,073 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 11:45:16,073 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 41 [2018-10-24 11:45:16,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:45:16,075 INFO L225 Difference]: With dead ends: 168 [2018-10-24 11:45:16,075 INFO L226 Difference]: Without dead ends: 166 [2018-10-24 11:45:16,077 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1238 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=965, Invalid=3727, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 11:45:16,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-10-24 11:45:16,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 72. [2018-10-24 11:45:16,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-24 11:45:16,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 76 transitions. [2018-10-24 11:45:16,088 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 76 transitions. Word has length 41 [2018-10-24 11:45:16,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:45:16,089 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 76 transitions. [2018-10-24 11:45:16,089 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 11:45:16,089 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 76 transitions. [2018-10-24 11:45:16,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-24 11:45:16,090 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:45:16,090 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:45:16,090 INFO L424 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:45:16,091 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:45:16,094 INFO L82 PathProgramCache]: Analyzing trace with hash 2131537546, now seen corresponding path program 5 times [2018-10-24 11:45:16,094 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:45:16,094 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:45:16,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:16,095 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:45:16,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:16,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:45:16,203 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 2 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:45:16,204 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:45:16,204 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-24 11:45:16,216 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-24 11:45:16,281 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2018-10-24 11:45:16,281 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:45:16,284 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:45:16,290 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 9 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:45:16,312 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:45:16,312 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 7 [2018-10-24 11:45:16,312 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 11:45:16,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 11:45:16,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-10-24 11:45:16,313 INFO L87 Difference]: Start difference. First operand 72 states and 76 transitions. Second operand 7 states. [2018-10-24 11:45:16,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:45:16,778 INFO L93 Difference]: Finished difference Result 138 states and 144 transitions. [2018-10-24 11:45:16,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 11:45:16,778 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 46 [2018-10-24 11:45:16,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:45:16,779 INFO L225 Difference]: With dead ends: 138 [2018-10-24 11:45:16,779 INFO L226 Difference]: Without dead ends: 127 [2018-10-24 11:45:16,780 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2018-10-24 11:45:16,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-24 11:45:16,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 78. [2018-10-24 11:45:16,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-24 11:45:16,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 82 transitions. [2018-10-24 11:45:16,790 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 82 transitions. Word has length 46 [2018-10-24 11:45:16,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:45:16,791 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 82 transitions. [2018-10-24 11:45:16,791 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 11:45:16,791 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 82 transitions. [2018-10-24 11:45:16,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-24 11:45:16,792 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:45:16,792 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:45:16,792 INFO L424 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:45:16,793 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:45:16,793 INFO L82 PathProgramCache]: Analyzing trace with hash -1875233400, now seen corresponding path program 6 times [2018-10-24 11:45:16,793 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:45:16,793 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:45:16,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:16,794 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:45:16,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:16,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:45:16,877 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 24 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:45:16,878 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:45:16,878 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:45:16,885 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-24 11:45:16,909 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2018-10-24 11:45:16,909 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:45:16,913 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:45:16,919 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 24 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:45:16,939 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:45:16,940 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 8 [2018-10-24 11:45:16,940 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 11:45:16,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 11:45:16,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-24 11:45:16,941 INFO L87 Difference]: Start difference. First operand 78 states and 82 transitions. Second operand 8 states. [2018-10-24 11:45:17,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:45:17,238 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2018-10-24 11:45:17,238 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 11:45:17,238 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 47 [2018-10-24 11:45:17,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:45:17,239 INFO L225 Difference]: With dead ends: 142 [2018-10-24 11:45:17,240 INFO L226 Difference]: Without dead ends: 125 [2018-10-24 11:45:17,243 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2018-10-24 11:45:17,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2018-10-24 11:45:17,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 78. [2018-10-24 11:45:17,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-24 11:45:17,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 81 transitions. [2018-10-24 11:45:17,262 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 81 transitions. Word has length 47 [2018-10-24 11:45:17,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:45:17,262 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 81 transitions. [2018-10-24 11:45:17,262 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 11:45:17,262 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 81 transitions. [2018-10-24 11:45:17,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 11:45:17,264 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:45:17,264 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 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] [2018-10-24 11:45:17,264 INFO L424 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:45:17,264 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:45:17,264 INFO L82 PathProgramCache]: Analyzing trace with hash 1848694960, now seen corresponding path program 2 times [2018-10-24 11:45:17,265 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:45:17,265 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:45:17,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:17,266 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:45:17,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:45:17,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-24 11:45:17,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-24 11:45:17,370 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-10-24 11:45:17,431 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 11:45:17 BoogieIcfgContainer [2018-10-24 11:45:17,431 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 11:45:17,432 INFO L168 Benchmark]: Toolchain (without parser) took 14741.53 ms. Allocated memory was 1.5 GB in the beginning and 2.4 GB in the end (delta: 868.7 MB). Free memory was 1.4 GB in the beginning and 1.8 GB in the end (delta: -365.5 MB). Peak memory consumption was 503.2 MB. Max. memory is 7.1 GB. [2018-10-24 11:45:17,433 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. [2018-10-24 11:45:17,434 INFO L168 Benchmark]: CACSL2BoogieTranslator took 311.47 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. [2018-10-24 11:45:17,435 INFO L168 Benchmark]: Boogie Procedure Inliner took 39.38 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. [2018-10-24 11:45:17,435 INFO L168 Benchmark]: Boogie Preprocessor took 29.98 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. [2018-10-24 11:45:17,435 INFO L168 Benchmark]: RCFGBuilder took 580.49 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 744.0 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -802.3 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. [2018-10-24 11:45:17,436 INFO L168 Benchmark]: TraceAbstraction took 13774.87 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 124.8 MB). Free memory was 2.2 GB in the beginning and 1.8 GB in the end (delta: 426.1 MB). Peak memory consumption was 550.9 MB. Max. memory is 7.1 GB. [2018-10-24 11:45:17,442 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 311.47 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 39.38 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 29.98 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 580.49 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 744.0 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -802.3 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 13774.87 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 124.8 MB). Free memory was 2.2 GB in the beginning and 1.8 GB in the end (delta: 426.1 MB). Peak memory consumption was 550.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L13] int MAX = __VERIFIER_nondet_uint(); [L14] FCALL char str1[MAX], str2[MAX]; [L15] int cont, i, j; [L16] cont = 0 [L18] i=0 [L18] COND TRUE i= 0 [L26] EXPR, FCALL str1[0] [L26] FCALL str2[j] = str1[0] [L27] j++ [L25] i-- [L25] COND TRUE i >= 0 [L26] EXPR, FCALL str1[0] [L26] FCALL str2[j] = str1[0] [L27] j++ [L25] i-- [L25] COND FALSE !(i >= 0) [L30] j = MAX-1 [L31] i=0 [L31] COND TRUE i