java -Xss4m -Xmx4000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCHC_wBE.xml --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -s ../../../trunk/examples/settings/chc/AutomizerCHC/AutomizerCHC_Goto.epf -i /storage/chc-comp/vmt-chc-benchmarks/ctigar/lifnatprime.c.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-14921ce [2018-06-25 01:05:35,711 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-25 01:05:35,714 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-25 01:05:35,725 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-25 01:05:35,726 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-25 01:05:35,727 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-25 01:05:35,728 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-25 01:05:35,736 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-25 01:05:35,738 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-25 01:05:35,738 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-25 01:05:35,739 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-25 01:05:35,740 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-25 01:05:35,740 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-25 01:05:35,743 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-06-25 01:05:35,743 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-25 01:05:35,744 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-25 01:05:35,746 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-25 01:05:35,748 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-25 01:05:35,749 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-25 01:05:35,751 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-25 01:05:35,752 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-25 01:05:35,754 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-25 01:05:35,755 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-25 01:05:35,755 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-25 01:05:35,756 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-25 01:05:35,757 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-25 01:05:35,757 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-25 01:05:35,758 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-25 01:05:35,759 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-25 01:05:35,760 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-25 01:05:35,760 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-25 01:05:35,761 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-25 01:05:35,761 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-25 01:05:35,762 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-25 01:05:35,763 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-25 01:05:35,763 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/chc/AutomizerCHC/AutomizerCHC_Goto.epf [2018-06-25 01:05:35,777 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-25 01:05:35,778 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-25 01:05:35,778 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-25 01:05:35,778 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-25 01:05:35,779 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-06-25 01:05:35,780 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-06-25 01:05:35,780 INFO L133 SettingsManager]: * Create interprocedural compositions=false [2018-06-25 01:05:35,780 INFO L133 SettingsManager]: * Use SBE=true [2018-06-25 01:05:35,781 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-25 01:05:35,781 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-25 01:05:35,781 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-25 01:05:35,781 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-25 01:05:35,781 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-25 01:05:35,782 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-25 01:05:35,782 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-25 01:05:35,782 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-25 01:05:35,782 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-25 01:05:35,783 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-25 01:05:35,783 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-25 01:05:35,783 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-25 01:05:35,783 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-25 01:05:35,785 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-25 01:05:35,785 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-25 01:05:35,829 INFO ]: Repository-Root is: /tmp [2018-06-25 01:05:35,844 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-25 01:05:35,850 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-25 01:05:35,851 INFO ]: Initializing SmtParser... [2018-06-25 01:05:35,852 INFO ]: SmtParser initialized [2018-06-25 01:05:35,853 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/ctigar/lifnatprime.c.smt2 [2018-06-25 01:05:35,854 INFO ]: Parsing .smt2 file as a set of Horn Clauses No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2018-06-25 01:05:35,931 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/lifnatprime.c.smt2 unknown [2018-06-25 01:05:36,443 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/lifnatprime.c.smt2 [2018-06-25 01:05:36,447 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-25 01:05:36,457 INFO ]: Walking toolchain with 5 elements. [2018-06-25 01:05:36,458 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-25 01:05:36,458 INFO ]: Initializing ChcToBoogie... [2018-06-25 01:05:36,458 INFO ]: ChcToBoogie initialized [2018-06-25 01:05:36,461 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 25.06 01:05:36" (1/1) ... [2018-06-25 01:05:36,539 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:05:36 Unit [2018-06-25 01:05:36,539 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-25 01:05:36,540 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-25 01:05:36,540 INFO ]: Initializing Boogie Preprocessor... [2018-06-25 01:05:36,540 INFO ]: Boogie Preprocessor initialized [2018-06-25 01:05:36,561 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:05:36" (1/1) ... [2018-06-25 01:05:36,561 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:05:36" (1/1) ... [2018-06-25 01:05:36,581 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:05:36" (1/1) ... [2018-06-25 01:05:36,581 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:05:36" (1/1) ... [2018-06-25 01:05:36,603 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:05:36" (1/1) ... [2018-06-25 01:05:36,616 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:05:36" (1/1) ... [2018-06-25 01:05:36,620 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:05:36" (1/1) ... [2018-06-25 01:05:36,625 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-25 01:05:36,625 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-25 01:05:36,625 INFO ]: Initializing RCFGBuilder... [2018-06-25 01:05:36,625 INFO ]: RCFGBuilder initialized [2018-06-25 01:05:36,626 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:05:36" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2018-06-25 01:05:36,658 INFO ]: Specification and implementation of procedure gotoProc given in one single declaration [2018-06-25 01:05:36,658 INFO ]: Found specification of procedure gotoProc [2018-06-25 01:05:36,658 INFO ]: Found implementation of procedure gotoProc [2018-06-25 01:05:36,658 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-25 01:05:36,658 INFO ]: Found specification of procedure Ultimate.START [2018-06-25 01:05:36,658 INFO ]: Found implementation of procedure Ultimate.START Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-25 01:05:37,062 INFO ]: Using library mode [2018-06-25 01:05:37,063 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.06 01:05:37 BoogieIcfgContainer [2018-06-25 01:05:37,063 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-25 01:05:37,064 INFO ]: ------------------------BlockEncodingV2---------------------------- [2018-06-25 01:05:37,064 INFO ]: Initializing BlockEncodingV2... [2018-06-25 01:05:37,065 INFO ]: BlockEncodingV2 initialized [2018-06-25 01:05:37,065 INFO ]: Executing the observer BlockEncodingObserver from plugin BlockEncodingV2 for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.06 01:05:37" (1/1) ... [2018-06-25 01:05:37,081 INFO ]: Initial Icfg 10 locations, 10 edges [2018-06-25 01:05:37,082 INFO ]: Using Remove infeasible edges [2018-06-25 01:05:37,083 INFO ]: Using Maximize final states [2018-06-25 01:05:37,083 INFO ]: Using Minimize states even if more edges are added than removed.=false [2018-06-25 01:05:37,083 INFO ]: Using Minimize states using LBE with the strategy=MULTI [2018-06-25 01:05:37,085 INFO ]: Using Remove sink states [2018-06-25 01:05:37,086 INFO ]: Using Apply optimizations until nothing changes=true [2018-06-25 01:05:37,086 INFO ]: Using Use SBE [2018-06-25 01:05:37,091 WARN ]: expecting exponential blowup for input size 8 [2018-06-25 01:05:37,202 WARN ]: aborting because of expected exponential blowup for input size 128 [2018-06-25 01:05:37,221 WARN ]: aborting because of expected exponential blowup for input size 128 [2018-06-25 01:05:37,225 INFO ]: SBE split 1 edges [2018-06-25 01:05:37,232 INFO ]: Removed 2 edges and 2 locations because of local infeasibility [2018-06-25 01:05:37,235 INFO ]: 0 new accepting states [2018-06-25 01:05:37,326 INFO ]: Removed 6 edges and 2 locations by large block encoding [2018-06-25 01:05:37,328 INFO ]: Removed 0 edges and 0 locations by removing sink states [2018-06-25 01:05:37,330 INFO ]: Removed 0 edges and 0 locations because of local infeasibility [2018-06-25 01:05:37,330 INFO ]: 0 new accepting states [2018-06-25 01:05:37,351 INFO ]: Removed 0 edges and 0 locations by large block encoding [2018-06-25 01:05:37,351 INFO ]: Removed 0 edges and 0 locations by removing sink states [2018-06-25 01:05:37,351 INFO ]: Encoded RCFG 6 locations, 8 edges [2018-06-25 01:05:37,352 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.blockencoding CFG 25.06 01:05:37 BasicIcfg [2018-06-25 01:05:37,352 INFO ]: ------------------------ END BlockEncodingV2---------------------------- [2018-06-25 01:05:37,353 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-25 01:05:37,353 INFO ]: Initializing TraceAbstraction... [2018-06-25 01:05:37,363 INFO ]: TraceAbstraction initialized [2018-06-25 01:05:37,363 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 25.06 01:05:36" (1/4) ... [2018-06-25 01:05:37,364 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19648e6e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 25.06 01:05:37, skipping insertion in model container [2018-06-25 01:05:37,364 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:05:36" (2/4) ... [2018-06-25 01:05:37,364 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19648e6e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.06 01:05:37, skipping insertion in model container [2018-06-25 01:05:37,364 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.06 01:05:37" (3/4) ... [2018-06-25 01:05:37,365 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19648e6e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.06 01:05:37, skipping insertion in model container [2018-06-25 01:05:37,365 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.blockencoding CFG 25.06 01:05:37" (4/4) ... [2018-06-25 01:05:37,366 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver_BEv2 [2018-06-25 01:05:37,379 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-25 01:05:37,388 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-25 01:05:37,447 INFO ]: Using default assertion order modulation [2018-06-25 01:05:37,448 INFO ]: Interprodecural is true [2018-06-25 01:05:37,448 INFO ]: Hoare is false [2018-06-25 01:05:37,448 INFO ]: Compute interpolants for FPandBP [2018-06-25 01:05:37,448 INFO ]: Backedges is TWOTRACK [2018-06-25 01:05:37,448 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-25 01:05:37,448 INFO ]: Difference is false [2018-06-25 01:05:37,448 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-25 01:05:37,448 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-25 01:05:37,462 INFO ]: Start isEmpty. Operand 6 states. [2018-06-25 01:05:37,477 INFO ]: Finished isEmpty. Found accepting run of length 6 [2018-06-25 01:05:37,477 INFO ]: Found error trace [2018-06-25 01:05:37,478 INFO ]: trace histogram [1, 1, 1, 1, 1] [2018-06-25 01:05:37,478 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 01:05:37,483 INFO ]: Analyzing trace with hash 35496740, now seen corresponding path program 1 times [2018-06-25 01:05:37,485 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 01:05:37,486 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 01:05:37,520 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:05:37,520 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 01:05:37,520 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:05:37,560 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:05:37,650 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:05:37,652 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-25 01:05:37,652 INFO ]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-06-25 01:05:37,653 INFO ]: Interpolant automaton has 3 states [2018-06-25 01:05:37,663 INFO ]: Constructing interpolant automaton starting with 3 interpolants. [2018-06-25 01:05:37,664 INFO ]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-06-25 01:05:37,666 INFO ]: Start difference. First operand 6 states. Second operand 3 states. [2018-06-25 01:05:37,750 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 01:05:37,750 INFO ]: Finished difference Result 7 states and 9 transitions. [2018-06-25 01:05:37,750 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-06-25 01:05:37,751 INFO ]: Start accepts. Automaton has 3 states. Word has length 5 [2018-06-25 01:05:37,751 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 01:05:37,758 INFO ]: With dead ends: 7 [2018-06-25 01:05:37,758 INFO ]: Without dead ends: 7 [2018-06-25 01:05:37,760 INFO ]: 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 [2018-06-25 01:05:37,777 INFO ]: Start minimizeSevpa. Operand 7 states. [2018-06-25 01:05:37,805 INFO ]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-06-25 01:05:37,809 INFO ]: Start removeUnreachable. Operand 7 states. [2018-06-25 01:05:37,809 INFO ]: Finished removeUnreachable. Reduced from 7 states to 7 states and 9 transitions. [2018-06-25 01:05:37,810 INFO ]: Start accepts. Automaton has 7 states and 9 transitions. Word has length 5 [2018-06-25 01:05:37,810 INFO ]: Finished accepts. word is rejected. [2018-06-25 01:05:37,810 INFO ]: Abstraction has 7 states and 9 transitions. [2018-06-25 01:05:37,811 INFO ]: Interpolant automaton has 3 states. [2018-06-25 01:05:37,811 INFO ]: Start isEmpty. Operand 7 states and 9 transitions. [2018-06-25 01:05:37,811 INFO ]: Finished isEmpty. Found accepting run of length 7 [2018-06-25 01:05:37,811 INFO ]: Found error trace [2018-06-25 01:05:37,811 INFO ]: trace histogram [1, 1, 1, 1, 1, 1] [2018-06-25 01:05:37,811 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 01:05:37,811 INFO ]: Analyzing trace with hash 1099958961, now seen corresponding path program 1 times [2018-06-25 01:05:37,811 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 01:05:37,811 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 01:05:37,814 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:05:37,814 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 01:05:37,814 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:05:37,964 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:05:38,213 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:05:38,213 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 01:05:38,213 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-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 [2018-06-25 01:05:38,232 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 01:05:38,340 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:05:38,350 INFO ]: Computing forward predicates... [2018-06-25 01:05:40,018 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:05:40,040 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 01:05:40,040 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2018-06-25 01:05:40,040 INFO ]: Interpolant automaton has 5 states [2018-06-25 01:05:40,040 INFO ]: Constructing interpolant automaton starting with 5 interpolants. [2018-06-25 01:05:40,040 INFO ]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-06-25 01:05:40,041 INFO ]: Start difference. First operand 7 states and 9 transitions. Second operand 5 states. [2018-06-25 01:05:40,217 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 01:05:40,217 INFO ]: Finished difference Result 10 states and 12 transitions. [2018-06-25 01:05:40,218 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-06-25 01:05:40,218 INFO ]: Start accepts. Automaton has 5 states. Word has length 6 [2018-06-25 01:05:40,218 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 01:05:40,218 INFO ]: With dead ends: 10 [2018-06-25 01:05:40,219 INFO ]: Without dead ends: 10 [2018-06-25 01:05:40,219 INFO ]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-06-25 01:05:40,219 INFO ]: Start minimizeSevpa. Operand 10 states. [2018-06-25 01:05:40,220 INFO ]: Finished minimizeSevpa. Reduced states from 10 to 8. [2018-06-25 01:05:40,220 INFO ]: Start removeUnreachable. Operand 8 states. [2018-06-25 01:05:40,220 INFO ]: Finished removeUnreachable. Reduced from 8 states to 8 states and 10 transitions. [2018-06-25 01:05:40,220 INFO ]: Start accepts. Automaton has 8 states and 10 transitions. Word has length 6 [2018-06-25 01:05:40,220 INFO ]: Finished accepts. word is rejected. [2018-06-25 01:05:40,220 INFO ]: Abstraction has 8 states and 10 transitions. [2018-06-25 01:05:40,220 INFO ]: Interpolant automaton has 5 states. [2018-06-25 01:05:40,221 INFO ]: Start isEmpty. Operand 8 states and 10 transitions. [2018-06-25 01:05:40,221 INFO ]: Finished isEmpty. Found accepting run of length 7 [2018-06-25 01:05:40,221 INFO ]: Found error trace [2018-06-25 01:05:40,221 INFO ]: trace histogram [1, 1, 1, 1, 1, 1] [2018-06-25 01:05:40,221 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 01:05:40,221 INFO ]: Analyzing trace with hash 1100882482, now seen corresponding path program 1 times [2018-06-25 01:05:40,221 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 01:05:40,221 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 01:05:40,222 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:05:40,222 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 01:05:40,222 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:05:40,271 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:05:40,637 WARN ]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-06-25 01:05:40,637 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:05:40,637 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 01:05:40,637 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-06-25 01:05:40,654 INFO ]: Keeping assertion order NOT_INCREMENTALLY Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-25 01:05:40,728 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:05:40,732 INFO ]: Computing forward predicates... [2018-06-25 01:05:41,071 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 01:05:42,248 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:05:42,268 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 01:05:42,324 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2018-06-25 01:05:42,325 INFO ]: Interpolant automaton has 5 states [2018-06-25 01:05:42,325 INFO ]: Constructing interpolant automaton starting with 5 interpolants. [2018-06-25 01:05:42,325 INFO ]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-06-25 01:05:42,325 INFO ]: Start difference. First operand 8 states and 10 transitions. Second operand 5 states. [2018-06-25 01:05:42,362 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 01:05:42,363 INFO ]: Finished difference Result 10 states and 12 transitions. [2018-06-25 01:05:42,363 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-25 01:05:42,363 INFO ]: Start accepts. Automaton has 5 states. Word has length 6 [2018-06-25 01:05:42,363 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 01:05:42,363 INFO ]: With dead ends: 10 [2018-06-25 01:05:42,363 INFO ]: Without dead ends: 10 [2018-06-25 01:05:42,364 INFO ]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-06-25 01:05:42,364 INFO ]: Start minimizeSevpa. Operand 10 states. [2018-06-25 01:05:42,365 INFO ]: Finished minimizeSevpa. Reduced states from 10 to 8. [2018-06-25 01:05:42,365 INFO ]: Start removeUnreachable. Operand 8 states. [2018-06-25 01:05:42,365 INFO ]: Finished removeUnreachable. Reduced from 8 states to 8 states and 10 transitions. [2018-06-25 01:05:42,365 INFO ]: Start accepts. Automaton has 8 states and 10 transitions. Word has length 6 [2018-06-25 01:05:42,365 INFO ]: Finished accepts. word is rejected. [2018-06-25 01:05:42,365 INFO ]: Abstraction has 8 states and 10 transitions. [2018-06-25 01:05:42,365 INFO ]: Interpolant automaton has 5 states. [2018-06-25 01:05:42,365 INFO ]: Start isEmpty. Operand 8 states and 10 transitions. [2018-06-25 01:05:42,365 INFO ]: Finished isEmpty. Found accepting run of length 8 [2018-06-25 01:05:42,365 INFO ]: Found error trace [2018-06-25 01:05:42,365 INFO ]: trace histogram [2, 1, 1, 1, 1, 1] [2018-06-25 01:05:42,366 INFO ]: === Iteration 4 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 01:05:42,366 INFO ]: Analyzing trace with hash -261450556, now seen corresponding path program 2 times [2018-06-25 01:05:42,366 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 01:05:42,366 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 01:05:42,367 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:05:42,367 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 01:05:42,367 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:05:42,434 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:05:42,632 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:05:42,632 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 01:05:42,632 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-25 01:05:42,638 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-25 01:05:42,728 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-25 01:05:42,728 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:05:42,732 INFO ]: Computing forward predicates... [2018-06-25 01:05:47,818 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:05:47,867 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 01:05:47,867 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2018-06-25 01:05:47,867 INFO ]: Interpolant automaton has 6 states [2018-06-25 01:05:47,867 INFO ]: Constructing interpolant automaton starting with 6 interpolants. [2018-06-25 01:05:47,867 INFO ]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2018-06-25 01:05:47,868 INFO ]: Start difference. First operand 8 states and 10 transitions. Second operand 6 states. [2018-06-25 01:05:48,973 WARN ]: Spent 977.00 ms on a formula simplification. DAG size of input: 12 DAG size of output: 12 [2018-06-25 01:05:49,409 WARN ]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2018-06-25 01:05:49,410 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 01:05:49,410 INFO ]: Finished difference Result 11 states and 13 transitions. [2018-06-25 01:05:49,410 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-25 01:05:49,410 INFO ]: Start accepts. Automaton has 6 states. Word has length 7 [2018-06-25 01:05:49,410 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 01:05:49,411 INFO ]: With dead ends: 11 [2018-06-25 01:05:49,411 INFO ]: Without dead ends: 11 [2018-06-25 01:05:49,411 INFO ]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-06-25 01:05:49,411 INFO ]: Start minimizeSevpa. Operand 11 states. [2018-06-25 01:05:49,414 INFO ]: Finished minimizeSevpa. Reduced states from 11 to 9. [2018-06-25 01:05:49,414 INFO ]: Start removeUnreachable. Operand 9 states. [2018-06-25 01:05:49,414 INFO ]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2018-06-25 01:05:49,415 INFO ]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 7 [2018-06-25 01:05:49,415 INFO ]: Finished accepts. word is rejected. [2018-06-25 01:05:49,415 INFO ]: Abstraction has 9 states and 11 transitions. [2018-06-25 01:05:49,415 INFO ]: Interpolant automaton has 6 states. [2018-06-25 01:05:49,415 INFO ]: Start isEmpty. Operand 9 states and 11 transitions. [2018-06-25 01:05:49,415 INFO ]: Finished isEmpty. Found accepting run of length 8 [2018-06-25 01:05:49,415 INFO ]: Found error trace [2018-06-25 01:05:49,415 INFO ]: trace histogram [2, 1, 1, 1, 1, 1] [2018-06-25 01:05:49,415 INFO ]: === Iteration 5 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 01:05:49,415 INFO ]: Analyzing trace with hash -232821405, now seen corresponding path program 2 times [2018-06-25 01:05:49,415 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 01:05:49,418 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 01:05:49,419 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:05:49,419 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-25 01:05:49,419 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:05:49,491 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:05:50,337 WARN ]: Spent 576.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 9 [2018-06-25 01:05:50,588 WARN ]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-06-25 01:05:50,588 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:05:50,589 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 01:05:50,589 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-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 [2018-06-25 01:05:50,607 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-25 01:05:50,706 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-25 01:05:50,706 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:05:50,710 INFO ]: Computing forward predicates... [2018-06-25 01:05:54,823 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:05:54,843 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 01:05:54,843 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2018-06-25 01:05:54,844 INFO ]: Interpolant automaton has 6 states [2018-06-25 01:05:54,844 INFO ]: Constructing interpolant automaton starting with 6 interpolants. [2018-06-25 01:05:54,844 INFO ]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-06-25 01:05:54,844 INFO ]: Start difference. First operand 9 states and 11 transitions. Second operand 6 states. [2018-06-25 01:05:54,958 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 01:05:54,958 INFO ]: Finished difference Result 14 states and 16 transitions. [2018-06-25 01:05:54,959 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-25 01:05:54,959 INFO ]: Start accepts. Automaton has 6 states. Word has length 7 [2018-06-25 01:05:54,959 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 01:05:54,961 INFO ]: With dead ends: 14 [2018-06-25 01:05:54,961 INFO ]: Without dead ends: 14 [2018-06-25 01:05:54,961 INFO ]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=26, Invalid=30, Unknown=0, NotChecked=0, Total=56 [2018-06-25 01:05:54,961 INFO ]: Start minimizeSevpa. Operand 14 states. [2018-06-25 01:05:54,963 INFO ]: Finished minimizeSevpa. Reduced states from 14 to 9. [2018-06-25 01:05:54,963 INFO ]: Start removeUnreachable. Operand 9 states. [2018-06-25 01:05:54,963 INFO ]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2018-06-25 01:05:54,963 INFO ]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 7 [2018-06-25 01:05:54,964 INFO ]: Finished accepts. word is rejected. [2018-06-25 01:05:54,964 INFO ]: Abstraction has 9 states and 11 transitions. [2018-06-25 01:05:54,964 INFO ]: Interpolant automaton has 6 states. [2018-06-25 01:05:54,964 INFO ]: Start isEmpty. Operand 9 states and 11 transitions. [2018-06-25 01:05:54,964 INFO ]: Finished isEmpty. Found accepting run of length 8 [2018-06-25 01:05:54,964 INFO ]: Found error trace [2018-06-25 01:05:54,964 INFO ]: trace histogram [2, 1, 1, 1, 1, 1] [2018-06-25 01:05:54,964 INFO ]: === Iteration 6 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 01:05:54,964 INFO ]: Analyzing trace with hash -204192254, now seen corresponding path program 1 times [2018-06-25 01:05:54,964 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 01:05:54,964 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 01:05:54,965 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:05:54,965 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-25 01:05:54,965 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:05:55,037 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:05:55,423 WARN ]: Spent 140.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 9 [2018-06-25 01:05:55,433 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:05:55,433 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 01:05:55,433 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-25 01:05:55,439 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 01:05:55,522 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:05:55,525 INFO ]: Computing forward predicates... [2018-06-25 01:05:58,141 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 01:06:06,655 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:06:06,675 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 01:06:06,675 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2018-06-25 01:06:06,675 INFO ]: Interpolant automaton has 6 states [2018-06-25 01:06:06,675 INFO ]: Constructing interpolant automaton starting with 6 interpolants. [2018-06-25 01:06:06,675 INFO ]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-06-25 01:06:06,675 INFO ]: Start difference. First operand 9 states and 11 transitions. Second operand 6 states. [2018-06-25 01:06:06,747 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 01:06:06,747 INFO ]: Finished difference Result 15 states and 17 transitions. [2018-06-25 01:06:06,750 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-25 01:06:06,750 INFO ]: Start accepts. Automaton has 6 states. Word has length 7 [2018-06-25 01:06:06,750 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 01:06:06,751 INFO ]: With dead ends: 15 [2018-06-25 01:06:06,751 INFO ]: Without dead ends: 15 [2018-06-25 01:06:06,751 INFO ]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=26, Invalid=30, Unknown=0, NotChecked=0, Total=56 [2018-06-25 01:06:06,751 INFO ]: Start minimizeSevpa. Operand 15 states. [2018-06-25 01:06:06,752 INFO ]: Finished minimizeSevpa. Reduced states from 15 to 9. [2018-06-25 01:06:06,752 INFO ]: Start removeUnreachable. Operand 9 states. [2018-06-25 01:06:06,752 INFO ]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2018-06-25 01:06:06,752 INFO ]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 7 [2018-06-25 01:06:06,753 INFO ]: Finished accepts. word is rejected. [2018-06-25 01:06:06,753 INFO ]: Abstraction has 9 states and 11 transitions. [2018-06-25 01:06:06,753 INFO ]: Interpolant automaton has 6 states. [2018-06-25 01:06:06,753 INFO ]: Start isEmpty. Operand 9 states and 11 transitions. [2018-06-25 01:06:06,753 INFO ]: Finished isEmpty. Found accepting run of length 9 [2018-06-25 01:06:06,753 INFO ]: Found error trace [2018-06-25 01:06:06,753 INFO ]: trace histogram [3, 1, 1, 1, 1, 1] [2018-06-25 01:06:06,753 INFO ]: === Iteration 7 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 01:06:06,753 INFO ]: Analyzing trace with hash 484527377, now seen corresponding path program 3 times [2018-06-25 01:06:06,753 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 01:06:06,753 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 01:06:06,754 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:06:06,754 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 01:06:06,754 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:06:06,852 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:06:07,115 WARN ]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2018-06-25 01:06:07,212 INFO ]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:06:07,212 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 01:06:07,212 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-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 [2018-06-25 01:06:07,218 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-25 01:06:07,333 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-06-25 01:06:07,333 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:06:07,337 INFO ]: Computing forward predicates... Received shutdown request... [2018-06-25 01:06:40,810 INFO ]: Timeout while computing interpolants [2018-06-25 01:06:41,011 WARN ]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-25 01:06:41,011 WARN ]: Verification canceled [2018-06-25 01:06:41,013 INFO ]: Did not count any witness invariants because Icfg is not BoogieIcfg [2018-06-25 01:06:41,014 WARN ]: Timeout [2018-06-25 01:06:41,014 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.06 01:06:41 BasicIcfg [2018-06-25 01:06:41,014 INFO ]: ------------------------ END TraceAbstraction---------------------------- [2018-06-25 01:06:41,015 INFO ]: Toolchain (without parser) took 64567.12 ms. Allocated memory was 307.2 MB in the beginning and 1.5 GB in the end (delta: 1.2 GB). Free memory was 237.7 MB in the beginning and 272.2 MB in the end (delta: -34.5 MB). Peak memory consumption was 1.3 GB. Max. memory is 3.6 GB. [2018-06-25 01:06:41,016 INFO ]: SmtParser took 0.08 ms. Allocated memory is still 307.2 MB. Free memory is still 272.7 MB. There was no memory consumed. Max. memory is 3.6 GB. [2018-06-25 01:06:41,016 INFO ]: ChcToBoogie took 81.79 ms. Allocated memory is still 307.2 MB. Free memory was 237.7 MB in the beginning and 234.7 MB in the end (delta: 3.0 MB). Peak memory consumption was 3.0 MB. Max. memory is 3.6 GB. [2018-06-25 01:06:41,018 INFO ]: Boogie Preprocessor took 84.60 ms. Allocated memory is still 307.2 MB. Free memory was 234.7 MB in the beginning and 232.7 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 3.6 GB. [2018-06-25 01:06:41,021 INFO ]: RCFGBuilder took 438.06 ms. Allocated memory is still 307.2 MB. Free memory was 232.7 MB in the beginning and 207.2 MB in the end (delta: 25.5 MB). Peak memory consumption was 25.5 MB. Max. memory is 3.6 GB. [2018-06-25 01:06:41,021 INFO ]: BlockEncodingV2 took 288.25 ms. Allocated memory was 307.2 MB in the beginning and 326.6 MB in the end (delta: 19.4 MB). Free memory was 207.2 MB in the beginning and 298.7 MB in the end (delta: -91.6 MB). Peak memory consumption was 25.9 MB. Max. memory is 3.6 GB. [2018-06-25 01:06:41,022 INFO ]: TraceAbstraction took 63660.95 ms. Allocated memory was 326.6 MB in the beginning and 1.5 GB in the end (delta: 1.2 GB). Free memory was 298.7 MB in the beginning and 272.2 MB in the end (delta: 26.6 MB). Peak memory consumption was 1.3 GB. Max. memory is 3.6 GB. [2018-06-25 01:06:41,025 INFO ]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.plugins.blockencoding: - StatisticsResult: Initial Icfg 10 locations, 10 edges - StatisticsResult: Encoded RCFG 6 locations, 8 edges * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * SmtParser took 0.08 ms. Allocated memory is still 307.2 MB. Free memory is still 272.7 MB. There was no memory consumed. Max. memory is 3.6 GB. * ChcToBoogie took 81.79 ms. Allocated memory is still 307.2 MB. Free memory was 237.7 MB in the beginning and 234.7 MB in the end (delta: 3.0 MB). Peak memory consumption was 3.0 MB. Max. memory is 3.6 GB. * Boogie Preprocessor took 84.60 ms. Allocated memory is still 307.2 MB. Free memory was 234.7 MB in the beginning and 232.7 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 3.6 GB. * RCFGBuilder took 438.06 ms. Allocated memory is still 307.2 MB. Free memory was 232.7 MB in the beginning and 207.2 MB in the end (delta: 25.5 MB). Peak memory consumption was 25.5 MB. Max. memory is 3.6 GB. * BlockEncodingV2 took 288.25 ms. Allocated memory was 307.2 MB in the beginning and 326.6 MB in the end (delta: 19.4 MB). Free memory was 207.2 MB in the beginning and 298.7 MB in the end (delta: -91.6 MB). Peak memory consumption was 25.9 MB. Max. memory is 3.6 GB. * TraceAbstraction took 63660.95 ms. Allocated memory was 326.6 MB in the beginning and 1.5 GB in the end (delta: 1.2 GB). Free memory was 298.7 MB in the beginning and 272.2 MB in the end (delta: 26.6 MB). Peak memory consumption was 1.3 GB. Max. memory is 3.6 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [UNKNOWN] : Timeout (TraceAbstraction) Unable to prove that assertion always holds Cancelled while BasicCegarLoop was analyzing trace of length 9 with TraceHistMax 3, while TraceCheckSpWp was constructing forward predicates, while XnfDer was eliminating 29 quantified variables from 22 xjuncts. - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 6 locations, 1 error locations. TIMEOUT Result, 63.5s OverallTime, 7 OverallIterations, 3 TraceHistogramMax, 2.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 42 SDtfs, 0 SDslu, 54 SDs, 0 SdLazy, 57 SolverSat, 31 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 61 GetRequests, 27 SyntacticMatches, 8 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 3.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=9occurred in iteration=4, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 17 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.7s SatisfiabilityAnalysisTime, 25.9s InterpolantComputationTime, 71 NumberOfCodeBlocks, 71 NumberOfCodeBlocksAsserted, 13 NumberOfCheckSat, 60 ConstructedInterpolants, 0 QuantifiedInterpolants, 1119 SizeOfPredicates, 35 NumberOfNonLiveVariables, 1466 ConjunctsInSsa, 115 ConjunctsInUnsatCore, 11 InterpolantComputations, 1 PerfectInterpolantSequences, 0/22 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/lifnatprime.c.smt2_AutomizerCHC_Goto.epf_AutomizerCHC_wBE.xml/Csv-GraphSizeCsvProvider-0-2018-06-25_01-06-41-038.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/lifnatprime.c.smt2_AutomizerCHC_Goto.epf_AutomizerCHC_wBE.xml/Csv-GraphSizeCsvProvider-1-2018-06-25_01-06-41-038.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/lifnatprime.c.smt2_AutomizerCHC_Goto.epf_AutomizerCHC_wBE.xml/Csv-Benchmark-0-2018-06-25_01-06-41-038.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/lifnatprime.c.smt2_AutomizerCHC_Goto.epf_AutomizerCHC_wBE.xml/Csv-TraceAbstractionBenchmarks-0-2018-06-25_01-06-41-038.csv Completed graceful shutdown