java -Xss4m -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_Goto.epf -i /storage/chc-comp/vmt-chc-benchmarks/ctigar/seq4.c.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-14921ce [2018-06-25 13:29:45,034 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-25 13:29:45,036 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-25 13:29:45,049 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-25 13:29:45,049 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-25 13:29:45,050 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-25 13:29:45,054 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-25 13:29:45,059 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-25 13:29:45,061 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-25 13:29:45,061 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-25 13:29:45,064 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-25 13:29:45,064 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-25 13:29:45,065 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-25 13:29:45,066 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-06-25 13:29:45,066 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-25 13:29:45,069 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-25 13:29:45,071 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-25 13:29:45,072 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-25 13:29:45,076 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-25 13:29:45,077 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-25 13:29:45,084 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-25 13:29:45,086 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-25 13:29:45,087 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-25 13:29:45,087 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-25 13:29:45,087 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-25 13:29:45,088 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-25 13:29:45,089 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-25 13:29:45,089 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-25 13:29:45,090 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-25 13:29:45,091 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-25 13:29:45,091 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-25 13:29:45,092 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-25 13:29:45,092 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-25 13:29:45,093 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-25 13:29:45,093 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-25 13:29:45,093 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/chc/AutomizerCHC/AutomizerCHC_Goto.epf [2018-06-25 13:29:45,110 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-25 13:29:45,111 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-25 13:29:45,111 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-25 13:29:45,111 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-25 13:29:45,112 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-06-25 13:29:45,112 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-06-25 13:29:45,112 INFO L133 SettingsManager]: * Create interprocedural compositions=false [2018-06-25 13:29:45,113 INFO L133 SettingsManager]: * Use SBE=true [2018-06-25 13:29:45,113 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-25 13:29:45,113 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-25 13:29:45,113 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-25 13:29:45,113 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-25 13:29:45,117 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-25 13:29:45,117 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-25 13:29:45,117 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-25 13:29:45,117 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-25 13:29:45,118 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-25 13:29:45,118 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-25 13:29:45,118 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-25 13:29:45,118 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-25 13:29:45,118 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-25 13:29:45,120 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-25 13:29:45,120 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-25 13:29:45,171 INFO ]: Repository-Root is: /tmp [2018-06-25 13:29:45,189 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-25 13:29:45,194 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-25 13:29:45,195 INFO ]: Initializing SmtParser... [2018-06-25 13:29:45,196 INFO ]: SmtParser initialized [2018-06-25 13:29:45,197 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/ctigar/seq4.c.smt2 [2018-06-25 13:29:45,198 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 13:29:45,290 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/seq4.c.smt2 unknown [2018-06-25 13:29:45,594 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/seq4.c.smt2 [2018-06-25 13:29:45,599 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-25 13:29:45,615 INFO ]: Walking toolchain with 4 elements. [2018-06-25 13:29:45,616 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-25 13:29:45,616 INFO ]: Initializing ChcToBoogie... [2018-06-25 13:29:45,616 INFO ]: ChcToBoogie initialized [2018-06-25 13:29:45,622 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 25.06 01:29:45" (1/1) ... [2018-06-25 13:29:45,684 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:29:45 Unit [2018-06-25 13:29:45,684 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-25 13:29:45,684 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-25 13:29:45,685 INFO ]: Initializing Boogie Preprocessor... [2018-06-25 13:29:45,685 INFO ]: Boogie Preprocessor initialized [2018-06-25 13:29:45,707 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:29:45" (1/1) ... [2018-06-25 13:29:45,707 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:29:45" (1/1) ... [2018-06-25 13:29:45,716 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:29:45" (1/1) ... [2018-06-25 13:29:45,716 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:29:45" (1/1) ... [2018-06-25 13:29:45,734 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:29:45" (1/1) ... [2018-06-25 13:29:45,736 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:29:45" (1/1) ... [2018-06-25 13:29:45,737 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:29:45" (1/1) ... [2018-06-25 13:29:45,740 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-25 13:29:45,749 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-25 13:29:45,749 INFO ]: Initializing RCFGBuilder... [2018-06-25 13:29:45,749 INFO ]: RCFGBuilder initialized [2018-06-25 13:29:45,750 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:29:45" (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 13:29:45,775 INFO ]: Specification and implementation of procedure gotoProc given in one single declaration [2018-06-25 13:29:45,776 INFO ]: Found specification of procedure gotoProc [2018-06-25 13:29:45,776 INFO ]: Found implementation of procedure gotoProc [2018-06-25 13:29:45,776 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-25 13:29:45,776 INFO ]: Found specification of procedure Ultimate.START [2018-06-25 13:29:45,776 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 13:29:46,042 INFO ]: Using library mode [2018-06-25 13:29:46,043 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.06 01:29:46 BoogieIcfgContainer [2018-06-25 13:29:46,043 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-25 13:29:46,044 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-25 13:29:46,044 INFO ]: Initializing TraceAbstraction... [2018-06-25 13:29:46,048 INFO ]: TraceAbstraction initialized [2018-06-25 13:29:46,048 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 25.06 01:29:45" (1/3) ... [2018-06-25 13:29:46,049 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6aaefb15 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 25.06 01:29:46, skipping insertion in model container [2018-06-25 13:29:46,049 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:29:45" (2/3) ... [2018-06-25 13:29:46,049 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6aaefb15 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.06 01:29:46, skipping insertion in model container [2018-06-25 13:29:46,049 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.06 01:29:46" (3/3) ... [2018-06-25 13:29:46,051 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver [2018-06-25 13:29:46,061 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-25 13:29:46,071 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-25 13:29:46,110 INFO ]: Using default assertion order modulation [2018-06-25 13:29:46,111 INFO ]: Interprodecural is true [2018-06-25 13:29:46,111 INFO ]: Hoare is false [2018-06-25 13:29:46,111 INFO ]: Compute interpolants for FPandBP [2018-06-25 13:29:46,111 INFO ]: Backedges is TWOTRACK [2018-06-25 13:29:46,111 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-25 13:29:46,111 INFO ]: Difference is false [2018-06-25 13:29:46,111 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-25 13:29:46,111 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-25 13:29:46,123 INFO ]: Start isEmpty. Operand 10 states. [2018-06-25 13:29:46,133 INFO ]: Finished isEmpty. Found accepting run of length 8 [2018-06-25 13:29:46,133 INFO ]: Found error trace [2018-06-25 13:29:46,134 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-06-25 13:29:46,134 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 13:29:46,139 INFO ]: Analyzing trace with hash 1285054476, now seen corresponding path program 1 times [2018-06-25 13:29:46,141 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 13:29:46,141 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 13:29:46,179 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:29:46,179 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 13:29:46,179 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:29:46,217 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:29:46,269 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:29:46,271 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-25 13:29:46,271 INFO ]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-06-25 13:29:46,272 INFO ]: Interpolant automaton has 3 states [2018-06-25 13:29:46,283 INFO ]: Constructing interpolant automaton starting with 3 interpolants. [2018-06-25 13:29:46,284 INFO ]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-06-25 13:29:46,285 INFO ]: Start difference. First operand 10 states. Second operand 3 states. [2018-06-25 13:29:46,353 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 13:29:46,353 INFO ]: Finished difference Result 9 states and 9 transitions. [2018-06-25 13:29:46,353 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-06-25 13:29:46,355 INFO ]: Start accepts. Automaton has 3 states. Word has length 7 [2018-06-25 13:29:46,355 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 13:29:46,364 INFO ]: With dead ends: 9 [2018-06-25 13:29:46,364 INFO ]: Without dead ends: 9 [2018-06-25 13:29:46,366 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 13:29:46,382 INFO ]: Start minimizeSevpa. Operand 9 states. [2018-06-25 13:29:46,399 INFO ]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-06-25 13:29:46,400 INFO ]: Start removeUnreachable. Operand 9 states. [2018-06-25 13:29:46,401 INFO ]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-06-25 13:29:46,402 INFO ]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2018-06-25 13:29:46,402 INFO ]: Finished accepts. word is rejected. [2018-06-25 13:29:46,402 INFO ]: Abstraction has 9 states and 9 transitions. [2018-06-25 13:29:46,402 INFO ]: Interpolant automaton has 3 states. [2018-06-25 13:29:46,402 INFO ]: Start isEmpty. Operand 9 states and 9 transitions. [2018-06-25 13:29:46,402 INFO ]: Finished isEmpty. Found accepting run of length 9 [2018-06-25 13:29:46,403 INFO ]: Found error trace [2018-06-25 13:29:46,403 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2018-06-25 13:29:46,403 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 13:29:46,403 INFO ]: Analyzing trace with hash 1180100628, now seen corresponding path program 1 times [2018-06-25 13:29:46,403 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 13:29:46,403 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 13:29:46,404 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:29:46,404 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 13:29:46,404 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:29:46,449 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:29:46,660 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:29:46,660 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 13:29:46,660 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 13:29:46,668 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 13:29:46,729 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:29:46,738 INFO ]: Computing forward predicates... [2018-06-25 13:29:47,122 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:29:47,144 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 13:29:47,144 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-06-25 13:29:47,145 INFO ]: Interpolant automaton has 4 states [2018-06-25 13:29:47,145 INFO ]: Constructing interpolant automaton starting with 4 interpolants. [2018-06-25 13:29:47,145 INFO ]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-06-25 13:29:47,145 INFO ]: Start difference. First operand 9 states and 9 transitions. Second operand 4 states. [2018-06-25 13:29:47,222 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 13:29:47,223 INFO ]: Finished difference Result 10 states and 10 transitions. [2018-06-25 13:29:47,223 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-06-25 13:29:47,223 INFO ]: Start accepts. Automaton has 4 states. Word has length 8 [2018-06-25 13:29:47,223 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 13:29:47,223 INFO ]: With dead ends: 10 [2018-06-25 13:29:47,223 INFO ]: Without dead ends: 10 [2018-06-25 13:29:47,224 INFO ]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-06-25 13:29:47,225 INFO ]: Start minimizeSevpa. Operand 10 states. [2018-06-25 13:29:47,226 INFO ]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-06-25 13:29:47,226 INFO ]: Start removeUnreachable. Operand 10 states. [2018-06-25 13:29:47,226 INFO ]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-06-25 13:29:47,226 INFO ]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 8 [2018-06-25 13:29:47,226 INFO ]: Finished accepts. word is rejected. [2018-06-25 13:29:47,226 INFO ]: Abstraction has 10 states and 10 transitions. [2018-06-25 13:29:47,226 INFO ]: Interpolant automaton has 4 states. [2018-06-25 13:29:47,226 INFO ]: Start isEmpty. Operand 10 states and 10 transitions. [2018-06-25 13:29:47,227 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-25 13:29:47,227 INFO ]: Found error trace [2018-06-25 13:29:47,227 INFO ]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2018-06-25 13:29:47,227 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 13:29:47,227 INFO ]: Analyzing trace with hash -2073468660, now seen corresponding path program 2 times [2018-06-25 13:29:47,227 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 13:29:47,227 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 13:29:47,229 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:29:47,229 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 13:29:47,229 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:29:47,322 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:29:47,754 WARN ]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2018-06-25 13:29:47,755 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:29:47,755 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 13:29:47,755 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 13:29:47,774 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-25 13:29:47,868 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-25 13:29:47,868 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:29:47,871 INFO ]: Computing forward predicates... [2018-06-25 13:29:49,908 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:29:49,940 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 13:29:49,940 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2018-06-25 13:29:49,941 INFO ]: Interpolant automaton has 6 states [2018-06-25 13:29:49,941 INFO ]: Constructing interpolant automaton starting with 6 interpolants. [2018-06-25 13:29:49,941 INFO ]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2018-06-25 13:29:49,941 INFO ]: Start difference. First operand 10 states and 10 transitions. Second operand 6 states. [2018-06-25 13:29:50,282 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 13:29:50,283 INFO ]: Finished difference Result 11 states and 11 transitions. [2018-06-25 13:29:50,284 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-25 13:29:50,284 INFO ]: Start accepts. Automaton has 6 states. Word has length 9 [2018-06-25 13:29:50,284 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 13:29:50,284 INFO ]: With dead ends: 11 [2018-06-25 13:29:50,284 INFO ]: Without dead ends: 11 [2018-06-25 13:29:50,284 INFO ]: 0 DeclaredPredicates, 15 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2018-06-25 13:29:50,285 INFO ]: Start minimizeSevpa. Operand 11 states. [2018-06-25 13:29:50,286 INFO ]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-06-25 13:29:50,286 INFO ]: Start removeUnreachable. Operand 11 states. [2018-06-25 13:29:50,286 INFO ]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-06-25 13:29:50,286 INFO ]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2018-06-25 13:29:50,286 INFO ]: Finished accepts. word is rejected. [2018-06-25 13:29:50,286 INFO ]: Abstraction has 11 states and 11 transitions. [2018-06-25 13:29:50,286 INFO ]: Interpolant automaton has 6 states. [2018-06-25 13:29:50,286 INFO ]: Start isEmpty. Operand 11 states and 11 transitions. [2018-06-25 13:29:50,286 INFO ]: Finished isEmpty. Found accepting run of length 11 [2018-06-25 13:29:50,286 INFO ]: Found error trace [2018-06-25 13:29:50,286 INFO ]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1] [2018-06-25 13:29:50,287 INFO ]: === Iteration 4 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 13:29:50,287 INFO ]: Analyzing trace with hash 145098516, now seen corresponding path program 3 times [2018-06-25 13:29:50,287 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 13:29:50,287 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 13:29:50,288 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:29:50,290 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-25 13:29:50,290 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:29:50,348 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:29:50,494 INFO ]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:29:50,494 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 13:29:50,494 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 13:29:50,502 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-25 13:29:50,580 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-06-25 13:29:50,580 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:29:50,584 INFO ]: Computing forward predicates... [2018-06-25 13:29:55,253 INFO ]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:29:55,288 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 13:29:55,288 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2018-06-25 13:29:55,288 INFO ]: Interpolant automaton has 8 states [2018-06-25 13:29:55,288 INFO ]: Constructing interpolant automaton starting with 8 interpolants. [2018-06-25 13:29:55,288 INFO ]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2018-06-25 13:29:55,289 INFO ]: Start difference. First operand 11 states and 11 transitions. Second operand 8 states. [2018-06-25 13:29:55,466 WARN ]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2018-06-25 13:29:56,021 WARN ]: Spent 423.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2018-06-25 13:29:56,926 WARN ]: Spent 727.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 10 [2018-06-25 13:29:56,927 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 13:29:56,927 INFO ]: Finished difference Result 12 states and 12 transitions. [2018-06-25 13:29:56,927 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-06-25 13:29:56,927 INFO ]: Start accepts. Automaton has 8 states. Word has length 10 [2018-06-25 13:29:56,927 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 13:29:56,927 INFO ]: With dead ends: 12 [2018-06-25 13:29:56,927 INFO ]: Without dead ends: 12 [2018-06-25 13:29:56,928 INFO ]: 0 DeclaredPredicates, 18 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=48, Invalid=62, Unknown=0, NotChecked=0, Total=110 [2018-06-25 13:29:56,928 INFO ]: Start minimizeSevpa. Operand 12 states. [2018-06-25 13:29:56,929 INFO ]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-06-25 13:29:56,929 INFO ]: Start removeUnreachable. Operand 12 states. [2018-06-25 13:29:56,929 INFO ]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-06-25 13:29:56,930 INFO ]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-06-25 13:29:56,930 INFO ]: Finished accepts. word is rejected. [2018-06-25 13:29:56,930 INFO ]: Abstraction has 12 states and 12 transitions. [2018-06-25 13:29:56,932 INFO ]: Interpolant automaton has 8 states. [2018-06-25 13:29:56,932 INFO ]: Start isEmpty. Operand 12 states and 12 transitions. [2018-06-25 13:29:56,932 INFO ]: Finished isEmpty. Found accepting run of length 12 [2018-06-25 13:29:56,932 INFO ]: Found error trace [2018-06-25 13:29:56,932 INFO ]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1] [2018-06-25 13:29:56,932 INFO ]: === Iteration 5 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 13:29:56,932 INFO ]: Analyzing trace with hash 201204236, now seen corresponding path program 4 times [2018-06-25 13:29:56,933 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 13:29:56,933 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 13:29:56,933 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:29:56,933 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-25 13:29:56,933 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:29:56,993 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:29:57,432 WARN ]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-06-25 13:29:57,742 WARN ]: Spent 231.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2018-06-25 13:29:57,761 INFO ]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:29:57,761 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 13:29:57,761 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 13:29:57,767 INFO ]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-06-25 13:29:57,828 INFO ]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-06-25 13:29:57,828 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:29:57,831 INFO ]: Computing forward predicates... [2018-06-25 13:30:01,170 WARN ]: expecting exponential blowup for input size 7 [2018-06-25 13:30:03,523 INFO ]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:30:03,543 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 13:30:03,543 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2018-06-25 13:30:03,543 INFO ]: Interpolant automaton has 8 states [2018-06-25 13:30:03,543 INFO ]: Constructing interpolant automaton starting with 8 interpolants. [2018-06-25 13:30:03,543 INFO ]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2018-06-25 13:30:03,543 INFO ]: Start difference. First operand 12 states and 12 transitions. Second operand 8 states. [2018-06-25 13:30:03,772 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 13:30:03,772 INFO ]: Finished difference Result 13 states and 13 transitions. [2018-06-25 13:30:03,772 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-06-25 13:30:03,772 INFO ]: Start accepts. Automaton has 8 states. Word has length 11 [2018-06-25 13:30:03,772 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 13:30:03,772 INFO ]: With dead ends: 13 [2018-06-25 13:30:03,772 INFO ]: Without dead ends: 13 [2018-06-25 13:30:03,773 INFO ]: 0 DeclaredPredicates, 22 GetRequests, 7 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=58, Invalid=98, Unknown=0, NotChecked=0, Total=156 [2018-06-25 13:30:03,773 INFO ]: Start minimizeSevpa. Operand 13 states. [2018-06-25 13:30:03,774 INFO ]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-06-25 13:30:03,774 INFO ]: Start removeUnreachable. Operand 13 states. [2018-06-25 13:30:03,775 INFO ]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-06-25 13:30:03,775 INFO ]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2018-06-25 13:30:03,775 INFO ]: Finished accepts. word is rejected. [2018-06-25 13:30:03,775 INFO ]: Abstraction has 13 states and 13 transitions. [2018-06-25 13:30:03,775 INFO ]: Interpolant automaton has 8 states. [2018-06-25 13:30:03,775 INFO ]: Start isEmpty. Operand 13 states and 13 transitions. [2018-06-25 13:30:03,775 INFO ]: Finished isEmpty. Found accepting run of length 13 [2018-06-25 13:30:03,775 INFO ]: Found error trace [2018-06-25 13:30:03,775 INFO ]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1] [2018-06-25 13:30:03,775 INFO ]: === Iteration 6 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 13:30:03,775 INFO ]: Analyzing trace with hash 1940481556, now seen corresponding path program 5 times [2018-06-25 13:30:03,775 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 13:30:03,775 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 13:30:03,776 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:30:03,776 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-25 13:30:03,776 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:30:03,852 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:30:04,726 WARN ]: Spent 615.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2018-06-25 13:30:05,200 WARN ]: Spent 400.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-06-25 13:30:05,306 INFO ]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:30:05,306 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 13:30:05,306 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 13:30:05,314 INFO ]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-06-25 13:30:05,370 INFO ]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2018-06-25 13:30:05,370 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:30:05,374 INFO ]: Computing forward predicates... [2018-06-25 13:30:05,516 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 13:30:06,804 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 13:30:06,874 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 13:30:06,932 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 13:30:07,000 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 13:30:07,062 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 13:30:07,118 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 13:30:07,172 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 13:30:07,222 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 13:30:07,276 WARN ]: expecting exponential blowup for input size 8 [2018-06-25 13:30:07,291 WARN ]: Simplifying disjunction of 5632 conjuctions. This might take some time... [2018-06-25 13:30:08,872 INFO ]: Simplified to disjunction of 3328 conjuctions. [2018-06-25 13:30:16,728 INFO ]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:30:16,750 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 13:30:16,750 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2018-06-25 13:30:16,750 INFO ]: Interpolant automaton has 9 states [2018-06-25 13:30:16,750 INFO ]: Constructing interpolant automaton starting with 9 interpolants. [2018-06-25 13:30:16,751 INFO ]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2018-06-25 13:30:16,751 INFO ]: Start difference. First operand 13 states and 13 transitions. Second operand 9 states. [2018-06-25 13:30:16,979 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 13:30:16,979 INFO ]: Finished difference Result 14 states and 14 transitions. [2018-06-25 13:30:16,979 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-06-25 13:30:16,979 INFO ]: Start accepts. Automaton has 9 states. Word has length 12 [2018-06-25 13:30:16,980 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 13:30:16,980 INFO ]: With dead ends: 14 [2018-06-25 13:30:16,980 INFO ]: Without dead ends: 14 [2018-06-25 13:30:16,981 INFO ]: 0 DeclaredPredicates, 25 GetRequests, 7 SyntacticMatches, 5 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=84, Invalid=126, Unknown=0, NotChecked=0, Total=210 [2018-06-25 13:30:16,981 INFO ]: Start minimizeSevpa. Operand 14 states. [2018-06-25 13:30:16,982 INFO ]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-06-25 13:30:16,982 INFO ]: Start removeUnreachable. Operand 14 states. [2018-06-25 13:30:16,982 INFO ]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-06-25 13:30:16,982 INFO ]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2018-06-25 13:30:16,983 INFO ]: Finished accepts. word is rejected. [2018-06-25 13:30:16,983 INFO ]: Abstraction has 14 states and 14 transitions. [2018-06-25 13:30:16,983 INFO ]: Interpolant automaton has 9 states. [2018-06-25 13:30:16,983 INFO ]: Start isEmpty. Operand 14 states and 14 transitions. [2018-06-25 13:30:16,983 INFO ]: Finished isEmpty. Found accepting run of length 14 [2018-06-25 13:30:16,983 INFO ]: Found error trace [2018-06-25 13:30:16,983 INFO ]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1] [2018-06-25 13:30:16,983 INFO ]: === Iteration 7 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 13:30:16,983 INFO ]: Analyzing trace with hash 23503628, now seen corresponding path program 6 times [2018-06-25 13:30:16,983 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 13:30:16,983 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 13:30:16,984 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:30:16,984 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-25 13:30:16,984 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:30:17,062 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:30:17,396 INFO ]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:30:17,397 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 13:30:17,397 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) [2018-06-25 13:30:17,415 INFO ]: Keeping assertion order MIX_INSIDE_OUTSIDE Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-25 13:30:17,488 INFO ]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2018-06-25 13:30:17,488 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:30:17,492 INFO ]: Computing forward predicates... Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown