java -Xss1g -Xmx4000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCHC.xml --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -s ../../../trunk/examples/settings/chc/AutomizerCHC/AutomizerCHC_No_Goto.epf -i /storage/chc-comp/vmt-chc-benchmarks/ctigar/nested6.c.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8d74a04 [2018-06-22 15:16:09,788 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-22 15:16:09,790 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-22 15:16:09,806 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-22 15:16:09,806 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-22 15:16:09,807 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-22 15:16:09,810 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-22 15:16:09,813 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-22 15:16:09,814 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-22 15:16:09,815 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-22 15:16:09,816 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-22 15:16:09,816 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-22 15:16:09,818 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-22 15:16:09,820 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-06-22 15:16:09,820 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-22 15:16:09,821 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-22 15:16:09,825 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-22 15:16:09,827 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-22 15:16:09,840 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-22 15:16:09,841 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-22 15:16:09,842 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-22 15:16:09,844 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-22 15:16:09,845 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-22 15:16:09,845 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-22 15:16:09,846 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-22 15:16:09,846 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-22 15:16:09,847 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-22 15:16:09,852 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-22 15:16:09,853 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-22 15:16:09,853 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-22 15:16:09,854 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-22 15:16:09,854 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-22 15:16:09,854 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-22 15:16:09,855 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-22 15:16:09,859 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-22 15:16:09,859 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/chc/AutomizerCHC/AutomizerCHC_No_Goto.epf [2018-06-22 15:16:09,879 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-22 15:16:09,880 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-22 15:16:09,880 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-22 15:16:09,880 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-22 15:16:09,881 INFO L131 SettingsManager]: Preferences of ChcToBoogie differ from their defaults: [2018-06-22 15:16:09,881 INFO L133 SettingsManager]: * Use one large procedure with gotos to replace tail recursive calls=false [2018-06-22 15:16:09,881 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-22 15:16:09,882 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-22 15:16:09,882 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-22 15:16:09,882 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-22 15:16:09,882 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-22 15:16:09,882 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-22 15:16:09,883 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-22 15:16:09,883 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-22 15:16:09,883 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-22 15:16:09,883 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-22 15:16:09,883 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-22 15:16:09,884 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-22 15:16:09,884 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-22 15:16:09,885 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-22 15:16:09,885 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-22 15:16:09,927 INFO ]: Repository-Root is: /tmp [2018-06-22 15:16:09,945 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-22 15:16:09,951 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-22 15:16:09,952 INFO ]: Initializing SmtParser... [2018-06-22 15:16:09,952 INFO ]: SmtParser initialized [2018-06-22 15:16:09,954 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/ctigar/nested6.c.smt2 [2018-06-22 15:16:09,955 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 [2018-06-22 15:16:10,049 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/nested6.c.smt2 unknown [2018-06-22 15:16:10,425 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/nested6.c.smt2 [2018-06-22 15:16:10,431 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-22 15:16:10,438 INFO ]: Walking toolchain with 4 elements. [2018-06-22 15:16:10,438 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-22 15:16:10,438 INFO ]: Initializing ChcToBoogie... [2018-06-22 15:16:10,438 INFO ]: ChcToBoogie initialized [2018-06-22 15:16:10,444 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 22.06 03:16:10" (1/1) ... [2018-06-22 15:16:10,492 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 03:16:10 Unit [2018-06-22 15:16:10,492 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-22 15:16:10,492 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-22 15:16:10,492 INFO ]: Initializing Boogie Preprocessor... [2018-06-22 15:16:10,492 INFO ]: Boogie Preprocessor initialized [2018-06-22 15:16:10,515 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 03:16:10" (1/1) ... [2018-06-22 15:16:10,515 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 03:16:10" (1/1) ... [2018-06-22 15:16:10,523 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 03:16:10" (1/1) ... [2018-06-22 15:16:10,523 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 03:16:10" (1/1) ... [2018-06-22 15:16:10,527 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 03:16:10" (1/1) ... [2018-06-22 15:16:10,529 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 03:16:10" (1/1) ... [2018-06-22 15:16:10,530 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 03:16:10" (1/1) ... [2018-06-22 15:16:10,532 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-22 15:16:10,533 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-22 15:16:10,533 INFO ]: Initializing RCFGBuilder... [2018-06-22 15:16:10,533 INFO ]: RCFGBuilder initialized [2018-06-22 15:16:10,534 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 03:16:10" (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) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-22 15:16:10,556 INFO ]: Specification and implementation of procedure False given in one single declaration [2018-06-22 15:16:10,556 INFO ]: Found specification of procedure False [2018-06-22 15:16:10,556 INFO ]: Found implementation of procedure False [2018-06-22 15:16:10,556 INFO ]: Specification and implementation of procedure state given in one single declaration [2018-06-22 15:16:10,556 INFO ]: Found specification of procedure state [2018-06-22 15:16:10,556 INFO ]: Found implementation of procedure state [2018-06-22 15:16:10,556 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-22 15:16:10,556 INFO ]: Found specification of procedure Ultimate.START [2018-06-22 15:16:10,557 INFO ]: Found implementation of procedure Ultimate.START [2018-06-22 15:16:10,776 INFO ]: Using library mode [2018-06-22 15:16:10,777 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.06 03:16:10 BoogieIcfgContainer [2018-06-22 15:16:10,777 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-22 15:16:10,778 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-22 15:16:10,778 INFO ]: Initializing TraceAbstraction... [2018-06-22 15:16:10,781 INFO ]: TraceAbstraction initialized [2018-06-22 15:16:10,781 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 22.06 03:16:10" (1/3) ... [2018-06-22 15:16:10,782 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@366cb895 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 22.06 03:16:10, skipping insertion in model container [2018-06-22 15:16:10,782 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 03:16:10" (2/3) ... [2018-06-22 15:16:10,782 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@366cb895 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.06 03:16:10, skipping insertion in model container [2018-06-22 15:16:10,782 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.06 03:16:10" (3/3) ... [2018-06-22 15:16:10,785 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver [2018-06-22 15:16:10,794 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-22 15:16:10,804 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-22 15:16:10,844 INFO ]: Using default assertion order modulation [2018-06-22 15:16:10,844 INFO ]: Interprodecural is true [2018-06-22 15:16:10,845 INFO ]: Hoare is false [2018-06-22 15:16:10,845 INFO ]: Compute interpolants for FPandBP [2018-06-22 15:16:10,845 INFO ]: Backedges is TWOTRACK [2018-06-22 15:16:10,845 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-22 15:16:10,845 INFO ]: Difference is false [2018-06-22 15:16:10,845 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-22 15:16:10,845 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-22 15:16:10,857 INFO ]: Start isEmpty. Operand 13 states. [2018-06-22 15:16:10,866 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-22 15:16:10,866 INFO ]: Found error trace [2018-06-22 15:16:10,867 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 15:16:10,867 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 15:16:10,871 INFO ]: Analyzing trace with hash -683425083, now seen corresponding path program 1 times [2018-06-22 15:16:10,872 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 15:16:10,873 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 15:16:10,913 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:16:10,913 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 15:16:10,913 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:16:10,944 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:16:11,136 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-22 15:16:11,138 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-22 15:16:11,138 INFO ]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-06-22 15:16:11,140 INFO ]: Interpolant automaton has 4 states [2018-06-22 15:16:11,174 INFO ]: Constructing interpolant automaton starting with 4 interpolants. [2018-06-22 15:16:11,174 INFO ]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-22 15:16:11,176 INFO ]: Start difference. First operand 13 states. Second operand 4 states. [2018-06-22 15:16:11,275 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 15:16:11,275 INFO ]: Finished difference Result 13 states and 14 transitions. [2018-06-22 15:16:11,276 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-06-22 15:16:11,277 INFO ]: Start accepts. Automaton has 4 states. Word has length 9 [2018-06-22 15:16:11,278 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 15:16:11,287 INFO ]: With dead ends: 13 [2018-06-22 15:16:11,287 INFO ]: Without dead ends: 13 [2018-06-22 15:16:11,288 INFO ]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-22 15:16:11,301 INFO ]: Start minimizeSevpa. Operand 13 states. [2018-06-22 15:16:11,320 INFO ]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-06-22 15:16:11,321 INFO ]: Start removeUnreachable. Operand 13 states. [2018-06-22 15:16:11,321 INFO ]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-06-22 15:16:11,322 INFO ]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 9 [2018-06-22 15:16:11,322 INFO ]: Finished accepts. word is rejected. [2018-06-22 15:16:11,322 INFO ]: Abstraction has 13 states and 14 transitions. [2018-06-22 15:16:11,322 INFO ]: Interpolant automaton has 4 states. [2018-06-22 15:16:11,322 INFO ]: Start isEmpty. Operand 13 states and 14 transitions. [2018-06-22 15:16:11,323 INFO ]: Finished isEmpty. Found accepting run of length 14 [2018-06-22 15:16:11,323 INFO ]: Found error trace [2018-06-22 15:16:11,323 INFO ]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 15:16:11,323 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 15:16:11,324 INFO ]: Analyzing trace with hash 204343015, now seen corresponding path program 1 times [2018-06-22 15:16:11,324 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 15:16:11,324 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 15:16:11,324 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:16:11,324 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 15:16:11,324 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:16:11,411 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:16:11,860 WARN ]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-06-22 15:16:11,863 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-22 15:16:11,863 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 15:16:11,863 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 [2018-06-22 15:16:11,873 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 15:16:11,922 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:16:11,933 INFO ]: Computing forward predicates... [2018-06-22 15:16:12,400 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-22 15:16:12,421 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 15:16:12,421 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2018-06-22 15:16:12,421 INFO ]: Interpolant automaton has 9 states [2018-06-22 15:16:12,421 INFO ]: Constructing interpolant automaton starting with 9 interpolants. [2018-06-22 15:16:12,422 INFO ]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2018-06-22 15:16:12,422 INFO ]: Start difference. First operand 13 states and 14 transitions. Second operand 9 states. [2018-06-22 15:16:12,724 WARN ]: Spent 227.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 16 [2018-06-22 15:16:13,071 WARN ]: Spent 179.00 ms on a formula simplification. DAG size of input: 9 DAG size of output: 7 [2018-06-22 15:16:13,084 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 15:16:13,084 INFO ]: Finished difference Result 15 states and 16 transitions. [2018-06-22 15:16:13,087 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-22 15:16:13,087 INFO ]: Start accepts. Automaton has 9 states. Word has length 13 [2018-06-22 15:16:13,087 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 15:16:13,088 INFO ]: With dead ends: 15 [2018-06-22 15:16:13,088 INFO ]: Without dead ends: 15 [2018-06-22 15:16:13,089 INFO ]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2018-06-22 15:16:13,089 INFO ]: Start minimizeSevpa. Operand 15 states. [2018-06-22 15:16:13,091 INFO ]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-06-22 15:16:13,091 INFO ]: Start removeUnreachable. Operand 15 states. [2018-06-22 15:16:13,092 INFO ]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-06-22 15:16:13,092 INFO ]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2018-06-22 15:16:13,092 INFO ]: Finished accepts. word is rejected. [2018-06-22 15:16:13,092 INFO ]: Abstraction has 15 states and 16 transitions. [2018-06-22 15:16:13,092 INFO ]: Interpolant automaton has 9 states. [2018-06-22 15:16:13,092 INFO ]: Start isEmpty. Operand 15 states and 16 transitions. [2018-06-22 15:16:13,093 INFO ]: Finished isEmpty. Found accepting run of length 18 [2018-06-22 15:16:13,093 INFO ]: Found error trace [2018-06-22 15:16:13,093 INFO ]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 15:16:13,093 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 15:16:13,093 INFO ]: Analyzing trace with hash -1649658231, now seen corresponding path program 2 times [2018-06-22 15:16:13,093 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 15:16:13,093 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 15:16:13,094 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:16:13,094 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 15:16:13,094 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:16:13,134 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:16:13,413 WARN ]: Spent 124.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 14 [2018-06-22 15:16:13,555 WARN ]: Spent 137.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2018-06-22 15:16:13,626 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-22 15:16:13,626 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 15:16:13,626 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) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-22 15:16:13,632 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-22 15:16:13,663 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-22 15:16:13,663 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:16:13,666 INFO ]: Computing forward predicates... [2018-06-22 15:16:13,958 WARN ]: Spent 156.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2018-06-22 15:16:14,114 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-22 15:16:14,137 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 15:16:14,137 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2018-06-22 15:16:14,137 INFO ]: Interpolant automaton has 11 states [2018-06-22 15:16:14,138 INFO ]: Constructing interpolant automaton starting with 11 interpolants. [2018-06-22 15:16:14,138 INFO ]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2018-06-22 15:16:14,138 INFO ]: Start difference. First operand 15 states and 16 transitions. Second operand 11 states. [2018-06-22 15:16:14,308 WARN ]: Spent 144.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 29 [2018-06-22 15:16:14,506 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 15:16:14,506 INFO ]: Finished difference Result 17 states and 18 transitions. [2018-06-22 15:16:14,507 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-06-22 15:16:14,507 INFO ]: Start accepts. Automaton has 11 states. Word has length 17 [2018-06-22 15:16:14,507 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 15:16:14,507 INFO ]: With dead ends: 17 [2018-06-22 15:16:14,507 INFO ]: Without dead ends: 17 [2018-06-22 15:16:14,508 INFO ]: 0 DeclaredPredicates, 27 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2018-06-22 15:16:14,508 INFO ]: Start minimizeSevpa. Operand 17 states. [2018-06-22 15:16:14,511 INFO ]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-06-22 15:16:14,511 INFO ]: Start removeUnreachable. Operand 17 states. [2018-06-22 15:16:14,512 INFO ]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-06-22 15:16:14,512 INFO ]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 17 [2018-06-22 15:16:14,512 INFO ]: Finished accepts. word is rejected. [2018-06-22 15:16:14,512 INFO ]: Abstraction has 17 states and 18 transitions. [2018-06-22 15:16:14,512 INFO ]: Interpolant automaton has 11 states. [2018-06-22 15:16:14,512 INFO ]: Start isEmpty. Operand 17 states and 18 transitions. [2018-06-22 15:16:14,513 INFO ]: Finished isEmpty. Found accepting run of length 22 [2018-06-22 15:16:14,513 INFO ]: Found error trace [2018-06-22 15:16:14,513 INFO ]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 15:16:14,513 INFO ]: === Iteration 4 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 15:16:14,513 INFO ]: Analyzing trace with hash 2119922091, now seen corresponding path program 3 times [2018-06-22 15:16:14,513 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 15:16:14,513 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 15:16:14,514 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:16:14,514 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 15:16:14,514 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:16:14,555 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:16:14,827 INFO ]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-22 15:16:14,827 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 15:16:14,827 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 [2018-06-22 15:16:14,843 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-22 15:16:14,919 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-06-22 15:16:14,919 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:16:14,923 INFO ]: Computing forward predicates... [2018-06-22 15:16:15,141 WARN ]: Spent 138.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 17 [2018-06-22 15:16:15,464 INFO ]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-22 15:16:15,484 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 15:16:15,484 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 13 [2018-06-22 15:16:15,485 INFO ]: Interpolant automaton has 13 states [2018-06-22 15:16:15,485 INFO ]: Constructing interpolant automaton starting with 13 interpolants. [2018-06-22 15:16:15,485 INFO ]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2018-06-22 15:16:15,485 INFO ]: Start difference. First operand 17 states and 18 transitions. Second operand 13 states. [2018-06-22 15:16:15,741 WARN ]: Spent 191.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 30 [2018-06-22 15:16:15,997 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 15:16:15,998 INFO ]: Finished difference Result 19 states and 20 transitions. [2018-06-22 15:16:16,001 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-06-22 15:16:16,001 INFO ]: Start accepts. Automaton has 13 states. Word has length 21 [2018-06-22 15:16:16,001 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 15:16:16,002 INFO ]: With dead ends: 19 [2018-06-22 15:16:16,002 INFO ]: Without dead ends: 19 [2018-06-22 15:16:16,002 INFO ]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2018-06-22 15:16:16,002 INFO ]: Start minimizeSevpa. Operand 19 states. [2018-06-22 15:16:16,006 INFO ]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-06-22 15:16:16,006 INFO ]: Start removeUnreachable. Operand 19 states. [2018-06-22 15:16:16,007 INFO ]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-06-22 15:16:16,007 INFO ]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 21 [2018-06-22 15:16:16,007 INFO ]: Finished accepts. word is rejected. [2018-06-22 15:16:16,007 INFO ]: Abstraction has 19 states and 20 transitions. [2018-06-22 15:16:16,007 INFO ]: Interpolant automaton has 13 states. [2018-06-22 15:16:16,007 INFO ]: Start isEmpty. Operand 19 states and 20 transitions. [2018-06-22 15:16:16,008 INFO ]: Finished isEmpty. Found accepting run of length 26 [2018-06-22 15:16:16,008 INFO ]: Found error trace [2018-06-22 15:16:16,008 INFO ]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 15:16:16,008 INFO ]: === Iteration 5 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 15:16:16,008 INFO ]: Analyzing trace with hash 1762711629, now seen corresponding path program 4 times [2018-06-22 15:16:16,008 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 15:16:16,008 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 15:16:16,009 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:16:16,009 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 15:16:16,009 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:16:16,079 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:16:16,393 WARN ]: Spent 108.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2018-06-22 15:16:16,671 INFO ]: Checked inductivity of 36 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-06-22 15:16:16,671 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 15:16:16,671 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 [2018-06-22 15:16:16,677 INFO ]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-06-22 15:16:16,732 INFO ]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-06-22 15:16:16,733 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:16:16,737 INFO ]: Computing forward predicates... [2018-06-22 15:16:17,044 WARN ]: Spent 107.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 31 [2018-06-22 15:16:17,412 INFO ]: Checked inductivity of 36 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-06-22 15:16:17,432 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 15:16:17,432 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 15 [2018-06-22 15:16:17,432 INFO ]: Interpolant automaton has 15 states [2018-06-22 15:16:17,432 INFO ]: Constructing interpolant automaton starting with 15 interpolants. [2018-06-22 15:16:17,432 INFO ]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2018-06-22 15:16:17,432 INFO ]: Start difference. First operand 19 states and 20 transitions. Second operand 15 states. [2018-06-22 15:16:17,892 WARN ]: Spent 407.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 46 [2018-06-22 15:16:18,124 WARN ]: Spent 208.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 36 [2018-06-22 15:16:18,368 WARN ]: Spent 226.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 41 [2018-06-22 15:16:18,619 WARN ]: Spent 229.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 35 [2018-06-22 15:16:18,866 WARN ]: Spent 228.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 44 [2018-06-22 15:16:18,894 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 15:16:18,894 INFO ]: Finished difference Result 21 states and 22 transitions. [2018-06-22 15:16:18,894 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-06-22 15:16:18,894 INFO ]: Start accepts. Automaton has 15 states. Word has length 25 [2018-06-22 15:16:18,895 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 15:16:18,895 INFO ]: With dead ends: 21 [2018-06-22 15:16:18,895 INFO ]: Without dead ends: 21 [2018-06-22 15:16:18,896 INFO ]: 0 DeclaredPredicates, 42 GetRequests, 19 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=87, Invalid=333, Unknown=0, NotChecked=0, Total=420 [2018-06-22 15:16:18,896 INFO ]: Start minimizeSevpa. Operand 21 states. [2018-06-22 15:16:18,899 INFO ]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-06-22 15:16:18,899 INFO ]: Start removeUnreachable. Operand 21 states. [2018-06-22 15:16:18,899 INFO ]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-06-22 15:16:18,899 INFO ]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 25 [2018-06-22 15:16:18,900 INFO ]: Finished accepts. word is rejected. [2018-06-22 15:16:18,900 INFO ]: Abstraction has 21 states and 22 transitions. [2018-06-22 15:16:18,900 INFO ]: Interpolant automaton has 15 states. [2018-06-22 15:16:18,900 INFO ]: Start isEmpty. Operand 21 states and 22 transitions. [2018-06-22 15:16:18,900 INFO ]: Finished isEmpty. Found accepting run of length 30 [2018-06-22 15:16:18,900 INFO ]: Found error trace [2018-06-22 15:16:18,901 INFO ]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 15:16:18,901 INFO ]: === Iteration 6 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 15:16:18,901 INFO ]: Analyzing trace with hash 853117551, now seen corresponding path program 5 times [2018-06-22 15:16:18,901 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 15:16:18,901 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 15:16:18,902 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:16:18,902 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 15:16:18,902 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:16:18,976 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:16:19,518 INFO ]: Checked inductivity of 55 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-06-22 15:16:19,518 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 15:16:19,518 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 [2018-06-22 15:16:19,525 INFO ]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-06-22 15:16:19,576 INFO ]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-06-22 15:16:19,576 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:16:19,581 INFO ]: Computing forward predicates... [2018-06-22 15:16:20,725 WARN ]: Spent 690.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 44 [2018-06-22 15:16:21,200 WARN ]: Spent 240.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 37 [2018-06-22 15:16:21,581 WARN ]: Spent 316.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 31 [2018-06-22 15:16:21,757 WARN ]: Spent 140.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 26 [2018-06-22 15:16:24,046 WARN ]: Spent 187.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 28 [2018-06-22 15:16:24,110 INFO ]: Checked inductivity of 55 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-06-22 15:16:24,131 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 15:16:24,131 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2018-06-22 15:16:24,132 INFO ]: Interpolant automaton has 25 states [2018-06-22 15:16:24,132 INFO ]: Constructing interpolant automaton starting with 25 interpolants. [2018-06-22 15:16:24,132 INFO ]: CoverageRelationStatistics Valid=67, Invalid=533, Unknown=0, NotChecked=0, Total=600 [2018-06-22 15:16:24,132 INFO ]: Start difference. First operand 21 states and 22 transitions. Second operand 25 states. [2018-06-22 15:16:25,003 WARN ]: Spent 710.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 77 [2018-06-22 15:16:25,335 WARN ]: Spent 295.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 55 [2018-06-22 15:16:25,783 WARN ]: Spent 402.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 50 [2018-06-22 15:16:26,359 WARN ]: Spent 540.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 63 [2018-06-22 15:16:27,234 WARN ]: Spent 843.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 70 [2018-06-22 15:16:27,775 WARN ]: Spent 510.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 65 [2018-06-22 15:16:27,922 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 15:16:27,923 INFO ]: Finished difference Result 23 states and 24 transitions. [2018-06-22 15:16:27,923 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-06-22 15:16:27,923 INFO ]: Start accepts. Automaton has 25 states. Word has length 29 [2018-06-22 15:16:27,923 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 15:16:27,924 INFO ]: With dead ends: 23 [2018-06-22 15:16:27,924 INFO ]: Without dead ends: 23 [2018-06-22 15:16:27,924 INFO ]: 0 DeclaredPredicates, 49 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=161, Invalid=831, Unknown=0, NotChecked=0, Total=992 [2018-06-22 15:16:27,925 INFO ]: Start minimizeSevpa. Operand 23 states. [2018-06-22 15:16:27,928 INFO ]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-06-22 15:16:27,928 INFO ]: Start removeUnreachable. Operand 23 states. [2018-06-22 15:16:27,928 INFO ]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-06-22 15:16:27,929 INFO ]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 29 [2018-06-22 15:16:27,929 INFO ]: Finished accepts. word is rejected. [2018-06-22 15:16:27,929 INFO ]: Abstraction has 23 states and 24 transitions. [2018-06-22 15:16:27,929 INFO ]: Interpolant automaton has 25 states. [2018-06-22 15:16:27,929 INFO ]: Start isEmpty. Operand 23 states and 24 transitions. [2018-06-22 15:16:27,930 INFO ]: Finished isEmpty. Found accepting run of length 34 [2018-06-22 15:16:27,930 INFO ]: Found error trace [2018-06-22 15:16:27,930 INFO ]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 15:16:27,930 INFO ]: === Iteration 7 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 15:16:27,930 INFO ]: Analyzing trace with hash -1661294575, now seen corresponding path program 6 times [2018-06-22 15:16:27,930 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 15:16:27,930 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 15:16:27,931 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:16:27,931 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 15:16:27,931 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:16:28,000 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:16:29,580 WARN ]: Spent 1.29 s on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2018-06-22 15:16:30,691 WARN ]: Spent 1.02 s on a formula simplification that was a NOOP. DAG size: 26 [2018-06-22 15:16:31,041 WARN ]: Spent 249.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2018-06-22 15:16:31,310 INFO ]: Checked inductivity of 78 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-06-22 15:16:31,310 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 15:16:31,310 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 [2018-06-22 15:16:31,316 INFO ]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-06-22 15:16:31,409 INFO ]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-06-22 15:16:31,409 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:16:31,414 INFO ]: Computing forward predicates... [2018-06-22 15:16:31,789 WARN ]: Spent 224.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 28 [2018-06-22 15:16:32,159 WARN ]: Spent 126.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 41 [2018-06-22 15:16:32,366 WARN ]: Spent 161.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 28 [2018-06-22 15:16:35,158 INFO ]: Checked inductivity of 78 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-06-22 15:16:35,186 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 15:16:35,186 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 27 [2018-06-22 15:16:35,187 INFO ]: Interpolant automaton has 27 states [2018-06-22 15:16:35,187 INFO ]: Constructing interpolant automaton starting with 27 interpolants. [2018-06-22 15:16:35,187 INFO ]: CoverageRelationStatistics Valid=66, Invalid=636, Unknown=0, NotChecked=0, Total=702 [2018-06-22 15:16:35,187 INFO ]: Start difference. First operand 23 states and 24 transitions. Second operand 27 states. [2018-06-22 15:16:35,859 WARN ]: Spent 586.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 81 [2018-06-22 15:16:36,134 WARN ]: Spent 219.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 39 [2018-06-22 15:16:36,427 WARN ]: Spent 260.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 49 [2018-06-22 15:16:36,856 WARN ]: Spent 345.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 54 [2018-06-22 15:16:37,234 WARN ]: Spent 344.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 65 [2018-06-22 15:16:37,536 WARN ]: Spent 262.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 47 [2018-06-22 15:16:37,872 WARN ]: Spent 306.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 50 [2018-06-22 15:16:37,909 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 15:16:37,909 INFO ]: Finished difference Result 25 states and 26 transitions. [2018-06-22 15:16:37,910 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-06-22 15:16:37,910 INFO ]: Start accepts. Automaton has 27 states. Word has length 33 [2018-06-22 15:16:37,910 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 15:16:37,911 INFO ]: With dead ends: 25 [2018-06-22 15:16:37,911 INFO ]: Without dead ends: 25 [2018-06-22 15:16:37,911 INFO ]: 0 DeclaredPredicates, 56 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=179, Invalid=1011, Unknown=0, NotChecked=0, Total=1190 [2018-06-22 15:16:37,912 INFO ]: Start minimizeSevpa. Operand 25 states. [2018-06-22 15:16:37,915 INFO ]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-06-22 15:16:37,915 INFO ]: Start removeUnreachable. Operand 25 states. [2018-06-22 15:16:37,915 INFO ]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2018-06-22 15:16:37,915 INFO ]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 33 [2018-06-22 15:16:37,916 INFO ]: Finished accepts. word is rejected. [2018-06-22 15:16:37,916 INFO ]: Abstraction has 25 states and 26 transitions. [2018-06-22 15:16:37,916 INFO ]: Interpolant automaton has 27 states. [2018-06-22 15:16:37,916 INFO ]: Start isEmpty. Operand 25 states and 26 transitions. [2018-06-22 15:16:37,917 INFO ]: Finished isEmpty. Found accepting run of length 38 [2018-06-22 15:16:37,917 INFO ]: Found error trace [2018-06-22 15:16:37,917 INFO ]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 15:16:37,917 INFO ]: === Iteration 8 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 15:16:37,917 INFO ]: Analyzing trace with hash -1494134477, now seen corresponding path program 7 times [2018-06-22 15:16:37,917 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 15:16:37,917 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 15:16:37,917 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:16:37,918 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 15:16:37,918 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:16:38,047 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:16:38,498 WARN ]: Spent 271.00 ms on a formula simplification. DAG size of input: 11 DAG size of output: 3 [2018-06-22 15:16:38,689 WARN ]: Spent 141.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 30 [2018-06-22 15:16:38,879 WARN ]: Spent 181.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 45 [2018-06-22 15:16:38,998 WARN ]: Spent 106.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 31 [2018-06-22 15:16:39,335 WARN ]: Spent 115.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 32 [2018-06-22 15:16:39,849 INFO ]: Checked inductivity of 105 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-06-22 15:16:39,849 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 15:16:39,849 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-22 15:16:39,855 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 15:16:39,940 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:16:39,948 INFO ]: Computing forward predicates... Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown