java -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/chccomp2018/chcToBoogie_automizer.epf -i /storage/chc-comp/vmt-chc-benchmarks/conc/szymanski_safe.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-55b8104 [2018-06-18 13:10:03,890 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-18 13:10:03,894 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-18 13:10:03,910 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-18 13:10:03,910 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-18 13:10:03,911 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-18 13:10:03,912 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-18 13:10:03,915 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-18 13:10:03,916 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-18 13:10:03,918 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-18 13:10:03,919 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-18 13:10:03,919 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-18 13:10:03,920 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-18 13:10:03,921 INFO L177 SettingsManager]: ChcToBoogie provides no preferences, ignoring... [2018-06-18 13:10:03,921 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-18 13:10:03,925 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-18 13:10:03,927 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-18 13:10:03,936 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-18 13:10:03,937 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-18 13:10:03,938 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-18 13:10:03,939 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-18 13:10:03,945 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-18 13:10:03,945 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-18 13:10:03,945 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-18 13:10:03,946 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-18 13:10:03,946 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-18 13:10:03,950 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-18 13:10:03,950 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-18 13:10:03,951 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-18 13:10:03,951 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-18 13:10:03,952 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-18 13:10:03,952 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-18 13:10:03,953 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-18 13:10:03,957 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-18 13:10:03,957 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-18 13:10:03,958 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/chccomp2018/chcToBoogie_automizer.epf [2018-06-18 13:10:03,981 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-18 13:10:03,982 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-18 13:10:03,982 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-18 13:10:03,982 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-18 13:10:03,983 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-18 13:10:03,984 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-18 13:10:03,984 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-18 13:10:03,984 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-18 13:10:03,984 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-18 13:10:03,984 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-18 13:10:03,985 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-18 13:10:03,985 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-18 13:10:03,985 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-18 13:10:03,985 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-18 13:10:03,985 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-18 13:10:03,985 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-18 13:10:03,986 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-18 13:10:03,988 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-18 13:10:03,988 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-18 13:10:04,036 INFO ]: Repository-Root is: /tmp [2018-06-18 13:10:04,050 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-18 13:10:04,056 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-18 13:10:04,058 INFO ]: Initializing SmtParser... [2018-06-18 13:10:04,058 INFO ]: SmtParser initialized [2018-06-18 13:10:04,059 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/conc/szymanski_safe.smt2 [2018-06-18 13:10:04,060 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 [2018-06-18 13:10:04,156 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/conc/szymanski_safe.smt2 unknown [2018-06-18 13:10:04,469 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/conc/szymanski_safe.smt2 [2018-06-18 13:10:04,475 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-18 13:10:04,480 INFO ]: Walking toolchain with 4 elements. [2018-06-18 13:10:04,481 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-18 13:10:04,481 INFO ]: Initializing ChcToBoogie... [2018-06-18 13:10:04,481 INFO ]: ChcToBoogie initialized [2018-06-18 13:10:04,491 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 18.06 01:10:04" (1/1) ... [2018-06-18 13:10:04,555 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:10:04 Unit [2018-06-18 13:10:04,556 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-18 13:10:04,556 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-18 13:10:04,556 INFO ]: Initializing Boogie Preprocessor... [2018-06-18 13:10:04,556 INFO ]: Boogie Preprocessor initialized [2018-06-18 13:10:04,578 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:10:04" (1/1) ... [2018-06-18 13:10:04,578 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:10:04" (1/1) ... [2018-06-18 13:10:04,588 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:10:04" (1/1) ... [2018-06-18 13:10:04,588 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:10:04" (1/1) ... [2018-06-18 13:10:04,604 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:10:04" (1/1) ... [2018-06-18 13:10:04,605 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:10:04" (1/1) ... [2018-06-18 13:10:04,606 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:10:04" (1/1) ... [2018-06-18 13:10:04,610 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-18 13:10:04,611 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-18 13:10:04,611 INFO ]: Initializing RCFGBuilder... [2018-06-18 13:10:04,611 INFO ]: RCFGBuilder initialized [2018-06-18 13:10:04,612 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:10:04" (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) [2018-06-18 13:10:04,646 INFO ]: Specification and implementation of procedure False given in one single declaration [2018-06-18 13:10:04,646 INFO ]: Found specification of procedure False [2018-06-18 13:10:04,646 INFO ]: Found implementation of procedure False [2018-06-18 13:10:04,646 INFO ]: Specification and implementation of procedure state given in one single declaration [2018-06-18 13:10:04,646 INFO ]: Found specification of procedure state [2018-06-18 13:10:04,646 INFO ]: Found implementation of procedure state [2018-06-18 13:10:04,646 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-18 13:10:04,646 INFO ]: Found specification of procedure Ultimate.START [2018-06-18 13:10:04,646 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 [2018-06-18 13:10:04,878 INFO ]: Using library mode [2018-06-18 13:10:04,879 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.06 01:10:04 BoogieIcfgContainer [2018-06-18 13:10:04,879 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-18 13:10:04,887 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-18 13:10:04,887 INFO ]: Initializing TraceAbstraction... [2018-06-18 13:10:04,890 INFO ]: TraceAbstraction initialized [2018-06-18 13:10:04,890 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 18.06 01:10:04" (1/3) ... [2018-06-18 13:10:04,891 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3178e4c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 18.06 01:10:04, skipping insertion in model container [2018-06-18 13:10:04,891 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:10:04" (2/3) ... [2018-06-18 13:10:04,891 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3178e4c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.06 01:10:04, skipping insertion in model container [2018-06-18 13:10:04,891 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.06 01:10:04" (3/3) ... [2018-06-18 13:10:04,893 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver [2018-06-18 13:10:04,902 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-18 13:10:04,912 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-18 13:10:04,962 INFO ]: Using default assertion order modulation [2018-06-18 13:10:04,962 INFO ]: Interprodecural is true [2018-06-18 13:10:04,962 INFO ]: Hoare is false [2018-06-18 13:10:04,962 INFO ]: Compute interpolants for FPandBP [2018-06-18 13:10:04,962 INFO ]: Backedges is TWOTRACK [2018-06-18 13:10:04,962 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-18 13:10:04,963 INFO ]: Difference is false [2018-06-18 13:10:04,963 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-18 13:10:04,965 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-18 13:10:04,987 INFO ]: Start isEmpty. Operand 13 states. [2018-06-18 13:10:04,999 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-18 13:10:04,999 INFO ]: Found error trace [2018-06-18 13:10:05,000 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:10:05,000 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:10:05,004 INFO ]: Analyzing trace with hash -683425083, now seen corresponding path program 1 times [2018-06-18 13:10:05,005 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:10:05,006 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:10:05,047 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:10:05,047 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:10:05,047 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:10:05,084 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:10:05,092 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:10:05,181 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-18 13:10:05,184 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-18 13:10:05,184 INFO ]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-06-18 13:10:05,185 INFO ]: Interpolant automaton has 4 states [2018-06-18 13:10:05,199 INFO ]: Constructing interpolant automaton starting with 4 interpolants. [2018-06-18 13:10:05,199 INFO ]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-18 13:10:05,201 INFO ]: Start difference. First operand 13 states. Second operand 4 states. [2018-06-18 13:10:05,281 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:10:05,281 INFO ]: Finished difference Result 13 states and 14 transitions. [2018-06-18 13:10:05,282 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-06-18 13:10:05,283 INFO ]: Start accepts. Automaton has 4 states. Word has length 9 [2018-06-18 13:10:05,284 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:10:05,300 INFO ]: With dead ends: 13 [2018-06-18 13:10:05,300 INFO ]: Without dead ends: 13 [2018-06-18 13:10:05,302 INFO ]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-18 13:10:05,320 INFO ]: Start minimizeSevpa. Operand 13 states. [2018-06-18 13:10:05,339 INFO ]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-06-18 13:10:05,341 INFO ]: Start removeUnreachable. Operand 13 states. [2018-06-18 13:10:05,342 INFO ]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-06-18 13:10:05,343 INFO ]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 9 [2018-06-18 13:10:05,343 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:10:05,343 INFO ]: Abstraction has 13 states and 14 transitions. [2018-06-18 13:10:05,343 INFO ]: Interpolant automaton has 4 states. [2018-06-18 13:10:05,343 INFO ]: Start isEmpty. Operand 13 states and 14 transitions. [2018-06-18 13:10:05,345 INFO ]: Finished isEmpty. Found accepting run of length 14 [2018-06-18 13:10:05,345 INFO ]: Found error trace [2018-06-18 13:10:05,345 INFO ]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:10:05,345 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:10:05,345 INFO ]: Analyzing trace with hash 204343015, now seen corresponding path program 1 times [2018-06-18 13:10:05,345 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:10:05,345 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:10:05,346 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:10:05,346 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:10:05,346 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:10:05,392 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:10:05,393 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:10:05,737 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-18 13:10:05,737 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:10:05,738 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 [2018-06-18 13:10:05,747 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:10:05,802 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:10:05,814 INFO ]: Computing forward predicates... [2018-06-18 13:10:06,437 WARN ]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2018-06-18 13:10:06,650 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-18 13:10:06,685 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:10:06,685 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2018-06-18 13:10:06,686 INFO ]: Interpolant automaton has 9 states [2018-06-18 13:10:06,686 INFO ]: Constructing interpolant automaton starting with 9 interpolants. [2018-06-18 13:10:06,686 INFO ]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2018-06-18 13:10:06,686 INFO ]: Start difference. First operand 13 states and 14 transitions. Second operand 9 states. [2018-06-18 13:10:07,221 WARN ]: Spent 292.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2018-06-18 13:10:07,337 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:10:07,337 INFO ]: Finished difference Result 15 states and 16 transitions. [2018-06-18 13:10:07,338 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-18 13:10:07,338 INFO ]: Start accepts. Automaton has 9 states. Word has length 13 [2018-06-18 13:10:07,338 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:10:07,339 INFO ]: With dead ends: 15 [2018-06-18 13:10:07,339 INFO ]: Without dead ends: 15 [2018-06-18 13:10:07,339 INFO ]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2018-06-18 13:10:07,339 INFO ]: Start minimizeSevpa. Operand 15 states. [2018-06-18 13:10:07,342 INFO ]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-06-18 13:10:07,342 INFO ]: Start removeUnreachable. Operand 15 states. [2018-06-18 13:10:07,343 INFO ]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-06-18 13:10:07,343 INFO ]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2018-06-18 13:10:07,343 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:10:07,343 INFO ]: Abstraction has 15 states and 16 transitions. [2018-06-18 13:10:07,343 INFO ]: Interpolant automaton has 9 states. [2018-06-18 13:10:07,343 INFO ]: Start isEmpty. Operand 15 states and 16 transitions. [2018-06-18 13:10:07,344 INFO ]: Finished isEmpty. Found accepting run of length 18 [2018-06-18 13:10:07,344 INFO ]: Found error trace [2018-06-18 13:10:07,344 INFO ]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:10:07,344 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:10:07,344 INFO ]: Analyzing trace with hash -1649658231, now seen corresponding path program 2 times [2018-06-18 13:10:07,344 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:10:07,344 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:10:07,345 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:10:07,345 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:10:07,345 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:10:07,394 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:10:07,394 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:10:07,846 WARN ]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-06-18 13:10:08,025 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-18 13:10:08,025 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:10:08,025 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 [2018-06-18 13:10:08,033 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-18 13:10:08,081 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-18 13:10:08,081 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:10:08,084 INFO ]: Computing forward predicates... [2018-06-18 13:10:15,557 WARN ]: Spent 4.51 s on a formula simplification. DAG size of input: 462 DAG size of output: 38 [2018-06-18 13:10:15,678 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-18 13:10:15,699 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:10:15,699 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2018-06-18 13:10:15,699 INFO ]: Interpolant automaton has 14 states [2018-06-18 13:10:15,699 INFO ]: Constructing interpolant automaton starting with 14 interpolants. [2018-06-18 13:10:15,699 INFO ]: CoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2018-06-18 13:10:15,700 INFO ]: Start difference. First operand 15 states and 16 transitions. Second operand 14 states. [2018-06-18 13:10:15,887 WARN ]: Spent 159.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 51 [2018-06-18 13:10:16,149 WARN ]: Spent 178.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 43 [2018-06-18 13:10:16,169 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:10:16,169 INFO ]: Finished difference Result 17 states and 18 transitions. [2018-06-18 13:10:16,170 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-06-18 13:10:16,170 INFO ]: Start accepts. Automaton has 14 states. Word has length 17 [2018-06-18 13:10:16,170 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:10:16,170 INFO ]: With dead ends: 17 [2018-06-18 13:10:16,170 INFO ]: Without dead ends: 17 [2018-06-18 13:10:16,171 INFO ]: 0 DeclaredPredicates, 27 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2018-06-18 13:10:16,171 INFO ]: Start minimizeSevpa. Operand 17 states. [2018-06-18 13:10:16,174 INFO ]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-06-18 13:10:16,174 INFO ]: Start removeUnreachable. Operand 17 states. [2018-06-18 13:10:16,175 INFO ]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-06-18 13:10:16,175 INFO ]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 17 [2018-06-18 13:10:16,175 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:10:16,175 INFO ]: Abstraction has 17 states and 18 transitions. [2018-06-18 13:10:16,175 INFO ]: Interpolant automaton has 14 states. [2018-06-18 13:10:16,175 INFO ]: Start isEmpty. Operand 17 states and 18 transitions. [2018-06-18 13:10:16,176 INFO ]: Finished isEmpty. Found accepting run of length 22 [2018-06-18 13:10:16,176 INFO ]: Found error trace [2018-06-18 13:10:16,176 INFO ]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:10:16,176 INFO ]: === Iteration 4 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:10:16,176 INFO ]: Analyzing trace with hash 2119922091, now seen corresponding path program 3 times [2018-06-18 13:10:16,176 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:10:16,176 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:10:16,177 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:10:16,177 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:10:16,177 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:10:16,220 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:10:16,221 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:10:16,497 WARN ]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-06-18 13:10:16,808 WARN ]: Spent 138.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 42 [2018-06-18 13:10:16,935 INFO ]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-18 13:10:16,935 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:10:16,935 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 [2018-06-18 13:10:16,942 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-18 13:10:17,020 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-06-18 13:10:17,021 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:10:17,025 INFO ]: Computing forward predicates... [2018-06-18 13:10:42,265 WARN ]: Spent 383.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 29 [2018-06-18 13:10:43,421 WARN ]: expecting exponential blowup for input size 6 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown