java -Xss4m -Xmx4000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCHC_wBE.xml --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -s ../../../trunk/examples/settings/chc/AutomizerCHC/AutomizerCHC_Goto.epf -i /storage/chc-comp/vmt-chc-benchmarks/ctigar/dillig20.c.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-62c3406-m [2018-06-26 21:23:17,070 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-26 21:23:17,072 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-26 21:23:17,083 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-26 21:23:17,083 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-26 21:23:17,084 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-26 21:23:17,086 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-26 21:23:17,087 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-26 21:23:17,089 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-26 21:23:17,090 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-26 21:23:17,090 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-26 21:23:17,091 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-26 21:23:17,091 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-26 21:23:17,092 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-26 21:23:17,093 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-06-26 21:23:17,094 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-26 21:23:17,095 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-26 21:23:17,097 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-26 21:23:17,099 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-26 21:23:17,100 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-26 21:23:17,101 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-26 21:23:17,102 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-26 21:23:17,105 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-26 21:23:17,105 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-26 21:23:17,105 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-26 21:23:17,106 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-26 21:23:17,107 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-26 21:23:17,108 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-26 21:23:17,109 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-26 21:23:17,110 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-26 21:23:17,110 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-26 21:23:17,111 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-26 21:23:17,111 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-06-26 21:23:17,111 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-26 21:23:17,112 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-26 21:23:17,113 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-26 21:23:17,113 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/chc/AutomizerCHC/AutomizerCHC_Goto.epf [2018-06-26 21:23:17,132 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-26 21:23:17,133 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-26 21:23:17,133 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-26 21:23:17,133 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-26 21:23:17,134 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-06-26 21:23:17,135 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-06-26 21:23:17,135 INFO L133 SettingsManager]: * Create interprocedural compositions=false [2018-06-26 21:23:17,135 INFO L133 SettingsManager]: * Use SBE=true [2018-06-26 21:23:17,135 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-26 21:23:17,135 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-26 21:23:17,136 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-26 21:23:17,136 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-26 21:23:17,136 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-26 21:23:17,136 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-26 21:23:17,137 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-26 21:23:17,137 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-26 21:23:17,137 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-26 21:23:17,137 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-26 21:23:17,137 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-26 21:23:17,138 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-26 21:23:17,138 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-26 21:23:17,139 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-26 21:23:17,140 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-26 21:23:17,185 INFO ]: Repository-Root is: /tmp [2018-06-26 21:23:17,196 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-26 21:23:17,200 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-26 21:23:17,205 INFO ]: Initializing SmtParser... [2018-06-26 21:23:17,205 INFO ]: SmtParser initialized [2018-06-26 21:23:17,206 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/ctigar/dillig20.c.smt2 [2018-06-26 21:23:17,207 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 [2018-06-26 21:23:17,301 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/dillig20.c.smt2 unknown [2018-06-26 21:23:17,635 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/dillig20.c.smt2 [2018-06-26 21:23:17,640 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-26 21:23:17,646 INFO ]: Walking toolchain with 5 elements. [2018-06-26 21:23:17,646 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-26 21:23:17,646 INFO ]: Initializing ChcToBoogie... [2018-06-26 21:23:17,646 INFO ]: ChcToBoogie initialized [2018-06-26 21:23:17,653 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 26.06 09:23:17" (1/1) ... [2018-06-26 21:23:17,708 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 26.06 09:23:17 Unit [2018-06-26 21:23:17,708 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-26 21:23:17,708 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-26 21:23:17,708 INFO ]: Initializing Boogie Preprocessor... [2018-06-26 21:23:17,708 INFO ]: Boogie Preprocessor initialized [2018-06-26 21:23:17,729 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 26.06 09:23:17" (1/1) ... [2018-06-26 21:23:17,729 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 26.06 09:23:17" (1/1) ... [2018-06-26 21:23:17,742 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 26.06 09:23:17" (1/1) ... [2018-06-26 21:23:17,742 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 26.06 09:23:17" (1/1) ... [2018-06-26 21:23:17,759 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 26.06 09:23:17" (1/1) ... [2018-06-26 21:23:17,761 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 26.06 09:23:17" (1/1) ... [2018-06-26 21:23:17,763 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 26.06 09:23:17" (1/1) ... [2018-06-26 21:23:17,774 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-26 21:23:17,775 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-26 21:23:17,775 INFO ]: Initializing RCFGBuilder... [2018-06-26 21:23:17,775 INFO ]: RCFGBuilder initialized [2018-06-26 21:23:17,776 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 26.06 09:23:17" (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 [2018-06-26 21:23:17,787 INFO ]: Specification and implementation of procedure gotoProc given in one single declaration [2018-06-26 21:23:17,787 INFO ]: Found specification of procedure gotoProc [2018-06-26 21:23:17,787 INFO ]: Found implementation of procedure gotoProc [2018-06-26 21:23:17,787 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-26 21:23:17,787 INFO ]: Found specification of procedure Ultimate.START [2018-06-26 21:23:17,787 INFO ]: Found implementation of procedure Ultimate.START [2018-06-26 21:23:18,056 INFO ]: Using library mode [2018-06-26 21:23:18,057 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.06 09:23:18 BoogieIcfgContainer [2018-06-26 21:23:18,057 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-26 21:23:18,057 INFO ]: ------------------------BlockEncodingV2---------------------------- [2018-06-26 21:23:18,057 INFO ]: Initializing BlockEncodingV2... [2018-06-26 21:23:18,058 INFO ]: BlockEncodingV2 initialized [2018-06-26 21:23:18,063 INFO ]: Executing the observer BlockEncodingObserver from plugin BlockEncodingV2 for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.06 09:23:18" (1/1) ... [2018-06-26 21:23:18,077 INFO ]: Initial Icfg 10 locations, 10 edges [2018-06-26 21:23:18,078 INFO ]: Using Remove infeasible edges [2018-06-26 21:23:18,079 INFO ]: Using Maximize final states [2018-06-26 21:23:18,079 INFO ]: Using Minimize states even if more edges are added than removed.=false [2018-06-26 21:23:18,080 INFO ]: Using Minimize states using LBE with the strategy=MULTI [2018-06-26 21:23:18,081 INFO ]: Using Remove sink states [2018-06-26 21:23:18,085 INFO ]: Using Apply optimizations until nothing changes=true [2018-06-26 21:23:18,085 INFO ]: Using Use SBE [2018-06-26 21:23:18,090 WARN ]: expecting exponential blowup for input size 6 [2018-06-26 21:23:18,124 WARN ]: aborting because of expected exponential blowup for input size 42 [2018-06-26 21:23:18,131 WARN ]: aborting because of expected exponential blowup for input size 42 [2018-06-26 21:23:18,131 INFO ]: SBE split 1 edges [2018-06-26 21:23:18,136 INFO ]: Removed 2 edges and 2 locations because of local infeasibility [2018-06-26 21:23:18,138 INFO ]: 0 new accepting states [2018-06-26 21:23:18,214 INFO ]: Removed 6 edges and 2 locations by large block encoding [2018-06-26 21:23:18,216 INFO ]: Removed 0 edges and 0 locations by removing sink states [2018-06-26 21:23:18,217 INFO ]: Removed 0 edges and 0 locations because of local infeasibility [2018-06-26 21:23:18,217 INFO ]: 0 new accepting states [2018-06-26 21:23:18,218 INFO ]: Removed 0 edges and 0 locations by large block encoding [2018-06-26 21:23:18,218 INFO ]: Removed 0 edges and 0 locations by removing sink states [2018-06-26 21:23:18,218 INFO ]: Encoded RCFG 6 locations, 8 edges [2018-06-26 21:23:18,218 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.blockencoding CFG 26.06 09:23:18 BasicIcfg [2018-06-26 21:23:18,218 INFO ]: ------------------------ END BlockEncodingV2---------------------------- [2018-06-26 21:23:18,219 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-26 21:23:18,220 INFO ]: Initializing TraceAbstraction... [2018-06-26 21:23:18,223 INFO ]: TraceAbstraction initialized [2018-06-26 21:23:18,223 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 26.06 09:23:17" (1/4) ... [2018-06-26 21:23:18,224 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d7c7566 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 26.06 09:23:18, skipping insertion in model container [2018-06-26 21:23:18,224 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 26.06 09:23:17" (2/4) ... [2018-06-26 21:23:18,225 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d7c7566 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.06 09:23:18, skipping insertion in model container [2018-06-26 21:23:18,225 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.06 09:23:18" (3/4) ... [2018-06-26 21:23:18,225 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d7c7566 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.06 09:23:18, skipping insertion in model container [2018-06-26 21:23:18,225 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.blockencoding CFG 26.06 09:23:18" (4/4) ... [2018-06-26 21:23:18,228 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver_BEv2 [2018-06-26 21:23:18,234 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-26 21:23:18,241 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-26 21:23:18,281 INFO ]: Using default assertion order modulation [2018-06-26 21:23:18,282 INFO ]: Interprodecural is true [2018-06-26 21:23:18,282 INFO ]: Hoare is false [2018-06-26 21:23:18,282 INFO ]: Compute interpolants for FPandBP [2018-06-26 21:23:18,285 INFO ]: Backedges is TWOTRACK [2018-06-26 21:23:18,285 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-26 21:23:18,285 INFO ]: Difference is false [2018-06-26 21:23:18,285 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-26 21:23:18,285 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-26 21:23:18,298 INFO ]: Start isEmpty. Operand 6 states. [2018-06-26 21:23:18,309 INFO ]: Finished isEmpty. Found accepting run of length 6 [2018-06-26 21:23:18,309 INFO ]: Found error trace [2018-06-26 21:23:18,312 INFO ]: trace histogram [1, 1, 1, 1, 1] [2018-06-26 21:23:18,312 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-26 21:23:18,317 INFO ]: Analyzing trace with hash 35496740, now seen corresponding path program 1 times [2018-06-26 21:23:18,319 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-26 21:23:18,319 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-26 21:23:18,363 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-26 21:23:18,363 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-26 21:23:18,363 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-26 21:23:18,400 INFO ]: Conjunction of SSA is unsat [2018-06-26 21:23:18,446 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-26 21:23:18,447 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-26 21:23:18,447 INFO ]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-06-26 21:23:18,449 INFO ]: Interpolant automaton has 3 states [2018-06-26 21:23:18,462 INFO ]: Constructing interpolant automaton starting with 3 interpolants. [2018-06-26 21:23:18,463 INFO ]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-06-26 21:23:18,464 INFO ]: Start difference. First operand 6 states. Second operand 3 states. [2018-06-26 21:23:18,558 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-26 21:23:18,558 INFO ]: Finished difference Result 7 states and 9 transitions. [2018-06-26 21:23:18,562 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-06-26 21:23:18,563 INFO ]: Start accepts. Automaton has 3 states. Word has length 5 [2018-06-26 21:23:18,563 INFO ]: Finished accepts. some prefix is accepted. [2018-06-26 21:23:18,569 INFO ]: With dead ends: 7 [2018-06-26 21:23:18,569 INFO ]: Without dead ends: 7 [2018-06-26 21:23:18,570 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 [2018-06-26 21:23:18,583 INFO ]: Start minimizeSevpa. Operand 7 states. [2018-06-26 21:23:18,597 INFO ]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-06-26 21:23:18,598 INFO ]: Start removeUnreachable. Operand 7 states. [2018-06-26 21:23:18,598 INFO ]: Finished removeUnreachable. Reduced from 7 states to 7 states and 9 transitions. [2018-06-26 21:23:18,600 INFO ]: Start accepts. Automaton has 7 states and 9 transitions. Word has length 5 [2018-06-26 21:23:18,600 INFO ]: Finished accepts. word is rejected. [2018-06-26 21:23:18,600 INFO ]: Abstraction has 7 states and 9 transitions. [2018-06-26 21:23:18,600 INFO ]: Interpolant automaton has 3 states. [2018-06-26 21:23:18,600 INFO ]: Start isEmpty. Operand 7 states and 9 transitions. [2018-06-26 21:23:18,600 INFO ]: Finished isEmpty. Found accepting run of length 6 [2018-06-26 21:23:18,600 INFO ]: Found error trace [2018-06-26 21:23:18,600 INFO ]: trace histogram [1, 1, 1, 1, 1] [2018-06-26 21:23:18,600 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-26 21:23:18,600 INFO ]: Analyzing trace with hash 35556322, now seen corresponding path program 1 times [2018-06-26 21:23:18,601 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-26 21:23:18,601 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-26 21:23:18,601 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-26 21:23:18,601 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-26 21:23:18,601 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-26 21:23:18,608 INFO ]: Conjunction of SSA is unsat [2018-06-26 21:23:18,632 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-26 21:23:18,632 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-26 21:23:18,632 INFO ]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-06-26 21:23:18,634 INFO ]: Interpolant automaton has 3 states [2018-06-26 21:23:18,634 INFO ]: Constructing interpolant automaton starting with 3 interpolants. [2018-06-26 21:23:18,634 INFO ]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-06-26 21:23:18,634 INFO ]: Start difference. First operand 7 states and 9 transitions. Second operand 3 states. [2018-06-26 21:23:18,732 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-26 21:23:18,732 INFO ]: Finished difference Result 8 states and 10 transitions. [2018-06-26 21:23:18,733 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-06-26 21:23:18,733 INFO ]: Start accepts. Automaton has 3 states. Word has length 5 [2018-06-26 21:23:18,733 INFO ]: Finished accepts. some prefix is accepted. [2018-06-26 21:23:18,733 INFO ]: With dead ends: 8 [2018-06-26 21:23:18,733 INFO ]: Without dead ends: 8 [2018-06-26 21:23:18,734 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 [2018-06-26 21:23:18,734 INFO ]: Start minimizeSevpa. Operand 8 states. [2018-06-26 21:23:18,735 INFO ]: Finished minimizeSevpa. Reduced states from 8 to 7. [2018-06-26 21:23:18,735 INFO ]: Start removeUnreachable. Operand 7 states. [2018-06-26 21:23:18,735 INFO ]: Finished removeUnreachable. Reduced from 7 states to 7 states and 9 transitions. [2018-06-26 21:23:18,736 INFO ]: Start accepts. Automaton has 7 states and 9 transitions. Word has length 5 [2018-06-26 21:23:18,736 INFO ]: Finished accepts. word is rejected. [2018-06-26 21:23:18,736 INFO ]: Abstraction has 7 states and 9 transitions. [2018-06-26 21:23:18,736 INFO ]: Interpolant automaton has 3 states. [2018-06-26 21:23:18,736 INFO ]: Start isEmpty. Operand 7 states and 9 transitions. [2018-06-26 21:23:18,736 INFO ]: Finished isEmpty. Found accepting run of length 7 [2018-06-26 21:23:18,736 INFO ]: Found error trace [2018-06-26 21:23:18,736 INFO ]: trace histogram [1, 1, 1, 1, 1, 1] [2018-06-26 21:23:18,736 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-26 21:23:18,736 INFO ]: Analyzing trace with hash 1099958961, now seen corresponding path program 1 times [2018-06-26 21:23:18,736 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-26 21:23:18,736 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-26 21:23:18,738 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-26 21:23:18,738 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-26 21:23:18,738 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-26 21:23:18,783 INFO ]: Conjunction of SSA is unsat [2018-06-26 21:23:18,992 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-26 21:23:18,993 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-26 21:23:18,993 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 [2018-06-26 21:23:18,999 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-26 21:23:19,063 INFO ]: Conjunction of SSA is unsat [2018-06-26 21:23:19,073 INFO ]: Computing forward predicates... [2018-06-26 21:23:19,319 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-26 21:23:19,339 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-26 21:23:19,339 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2018-06-26 21:23:19,339 INFO ]: Interpolant automaton has 5 states [2018-06-26 21:23:19,340 INFO ]: Constructing interpolant automaton starting with 5 interpolants. [2018-06-26 21:23:19,340 INFO ]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-06-26 21:23:19,340 INFO ]: Start difference. First operand 7 states and 9 transitions. Second operand 5 states. [2018-06-26 21:23:19,632 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-26 21:23:19,632 INFO ]: Finished difference Result 9 states and 11 transitions. [2018-06-26 21:23:19,635 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-06-26 21:23:19,635 INFO ]: Start accepts. Automaton has 5 states. Word has length 6 [2018-06-26 21:23:19,635 INFO ]: Finished accepts. some prefix is accepted. [2018-06-26 21:23:19,636 INFO ]: With dead ends: 9 [2018-06-26 21:23:19,636 INFO ]: Without dead ends: 9 [2018-06-26 21:23:19,636 INFO ]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2018-06-26 21:23:19,636 INFO ]: Start minimizeSevpa. Operand 9 states. [2018-06-26 21:23:19,637 INFO ]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-06-26 21:23:19,637 INFO ]: Start removeUnreachable. Operand 9 states. [2018-06-26 21:23:19,637 INFO ]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2018-06-26 21:23:19,638 INFO ]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 6 [2018-06-26 21:23:19,638 INFO ]: Finished accepts. word is rejected. [2018-06-26 21:23:19,638 INFO ]: Abstraction has 9 states and 11 transitions. [2018-06-26 21:23:19,638 INFO ]: Interpolant automaton has 5 states. [2018-06-26 21:23:19,638 INFO ]: Start isEmpty. Operand 9 states and 11 transitions. [2018-06-26 21:23:19,638 INFO ]: Finished isEmpty. Found accepting run of length 9 [2018-06-26 21:23:19,638 INFO ]: Found error trace [2018-06-26 21:23:19,638 INFO ]: trace histogram [3, 1, 1, 1, 1, 1] [2018-06-26 21:23:19,638 INFO ]: === Iteration 4 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-26 21:23:19,638 INFO ]: Analyzing trace with hash 484527377, now seen corresponding path program 2 times [2018-06-26 21:23:19,638 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-26 21:23:19,638 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-26 21:23:19,639 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-26 21:23:19,639 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-26 21:23:19,639 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-26 21:23:19,724 INFO ]: Conjunction of SSA is unsat [2018-06-26 21:23:20,171 WARN ]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-06-26 21:23:20,323 WARN ]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2018-06-26 21:23:20,428 INFO ]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-26 21:23:20,428 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-26 21:23:20,428 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 [2018-06-26 21:23:20,441 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-26 21:23:20,531 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-26 21:23:20,531 INFO ]: Conjunction of SSA is unsat [2018-06-26 21:23:20,535 INFO ]: Computing forward predicates... [2018-06-26 21:23:27,126 INFO ]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-26 21:23:27,159 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-26 21:23:27,159 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2018-06-26 21:23:27,159 INFO ]: Interpolant automaton has 7 states [2018-06-26 21:23:27,159 INFO ]: Constructing interpolant automaton starting with 7 interpolants. [2018-06-26 21:23:27,159 INFO ]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-06-26 21:23:27,159 INFO ]: Start difference. First operand 9 states and 11 transitions. Second operand 7 states. [2018-06-26 21:23:27,325 WARN ]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2018-06-26 21:23:27,934 WARN ]: Spent 467.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 13 [2018-06-26 21:23:28,047 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-26 21:23:28,047 INFO ]: Finished difference Result 13 states and 15 transitions. [2018-06-26 21:23:28,047 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-06-26 21:23:28,047 INFO ]: Start accepts. Automaton has 7 states. Word has length 8 [2018-06-26 21:23:28,048 INFO ]: Finished accepts. some prefix is accepted. [2018-06-26 21:23:28,048 INFO ]: With dead ends: 13 [2018-06-26 21:23:28,048 INFO ]: Without dead ends: 13 [2018-06-26 21:23:28,048 INFO ]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=43, Invalid=67, Unknown=0, NotChecked=0, Total=110 [2018-06-26 21:23:28,048 INFO ]: Start minimizeSevpa. Operand 13 states. [2018-06-26 21:23:28,050 INFO ]: Finished minimizeSevpa. Reduced states from 13 to 10. [2018-06-26 21:23:28,050 INFO ]: Start removeUnreachable. Operand 10 states. [2018-06-26 21:23:28,050 INFO ]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2018-06-26 21:23:28,050 INFO ]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 8 [2018-06-26 21:23:28,050 INFO ]: Finished accepts. word is rejected. [2018-06-26 21:23:28,050 INFO ]: Abstraction has 10 states and 12 transitions. [2018-06-26 21:23:28,050 INFO ]: Interpolant automaton has 7 states. [2018-06-26 21:23:28,050 INFO ]: Start isEmpty. Operand 10 states and 12 transitions. [2018-06-26 21:23:28,051 INFO ]: Finished isEmpty. Found accepting run of length 9 [2018-06-26 21:23:28,051 INFO ]: Found error trace [2018-06-26 21:23:28,051 INFO ]: trace histogram [3, 1, 1, 1, 1, 1] [2018-06-26 21:23:28,051 INFO ]: === Iteration 5 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-26 21:23:28,051 INFO ]: Analyzing trace with hash -2035432557, now seen corresponding path program 1 times [2018-06-26 21:23:28,051 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-26 21:23:28,051 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-26 21:23:28,052 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-26 21:23:28,052 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-26 21:23:28,052 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-26 21:23:28,119 INFO ]: Conjunction of SSA is unsat [2018-06-26 21:23:28,264 INFO ]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-26 21:23:28,264 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-26 21:23:28,264 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 [2018-06-26 21:23:28,271 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-26 21:23:28,327 INFO ]: Conjunction of SSA is unsat [2018-06-26 21:23:28,330 INFO ]: Computing forward predicates... [2018-06-26 21:23:30,243 INFO ]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-26 21:23:30,264 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-26 21:23:30,264 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2018-06-26 21:23:30,264 INFO ]: Interpolant automaton has 7 states [2018-06-26 21:23:30,264 INFO ]: Constructing interpolant automaton starting with 7 interpolants. [2018-06-26 21:23:30,264 INFO ]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2018-06-26 21:23:30,264 INFO ]: Start difference. First operand 10 states and 12 transitions. Second operand 7 states. [2018-06-26 21:23:30,391 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-26 21:23:30,391 INFO ]: Finished difference Result 14 states and 16 transitions. [2018-06-26 21:23:30,391 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-06-26 21:23:30,391 INFO ]: Start accepts. Automaton has 7 states. Word has length 8 [2018-06-26 21:23:30,391 INFO ]: Finished accepts. some prefix is accepted. [2018-06-26 21:23:30,391 INFO ]: With dead ends: 14 [2018-06-26 21:23:30,391 INFO ]: Without dead ends: 14 [2018-06-26 21:23:30,392 INFO ]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=65, Unknown=0, NotChecked=0, Total=110 [2018-06-26 21:23:30,392 INFO ]: Start minimizeSevpa. Operand 14 states. [2018-06-26 21:23:30,393 INFO ]: Finished minimizeSevpa. Reduced states from 14 to 10. [2018-06-26 21:23:30,393 INFO ]: Start removeUnreachable. Operand 10 states. [2018-06-26 21:23:30,394 INFO ]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2018-06-26 21:23:30,394 INFO ]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 8 [2018-06-26 21:23:30,394 INFO ]: Finished accepts. word is rejected. [2018-06-26 21:23:30,394 INFO ]: Abstraction has 10 states and 12 transitions. [2018-06-26 21:23:30,394 INFO ]: Interpolant automaton has 7 states. [2018-06-26 21:23:30,394 INFO ]: Start isEmpty. Operand 10 states and 12 transitions. [2018-06-26 21:23:30,394 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-26 21:23:30,394 INFO ]: Found error trace [2018-06-26 21:23:30,394 INFO ]: trace histogram [4, 1, 1, 1, 1, 1] [2018-06-26 21:23:30,394 INFO ]: === Iteration 6 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-26 21:23:30,394 INFO ]: Analyzing trace with hash 2135006820, now seen corresponding path program 3 times [2018-06-26 21:23:30,395 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-26 21:23:30,395 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-26 21:23:30,395 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-26 21:23:30,395 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-26 21:23:30,395 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-26 21:23:30,450 INFO ]: Conjunction of SSA is unsat [2018-06-26 21:23:30,718 INFO ]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-26 21:23:30,718 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-26 21:23:30,718 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 [2018-06-26 21:23:30,739 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-26 21:23:30,842 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-06-26 21:23:30,842 INFO ]: Conjunction of SSA is unsat [2018-06-26 21:23:30,851 INFO ]: Computing forward predicates... [2018-06-26 21:23:31,862 WARN ]: expecting exponential blowup for input size 6 [2018-06-26 21:23:31,874 WARN ]: expecting exponential blowup for input size 6 [2018-06-26 21:23:31,890 WARN ]: expecting exponential blowup for input size 8 [2018-06-26 21:23:31,904 WARN ]: expecting exponential blowup for input size 7 [2018-06-26 21:23:38,707 WARN ]: Spent 269.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 11 [2018-06-26 21:23:40,033 INFO ]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-26 21:23:40,054 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-26 21:23:40,054 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2018-06-26 21:23:40,054 INFO ]: Interpolant automaton has 9 states [2018-06-26 21:23:40,054 INFO ]: Constructing interpolant automaton starting with 9 interpolants. [2018-06-26 21:23:40,054 INFO ]: CoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2018-06-26 21:23:40,054 INFO ]: Start difference. First operand 10 states and 12 transitions. Second operand 9 states. [2018-06-26 21:23:40,263 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-26 21:23:40,263 INFO ]: Finished difference Result 15 states and 17 transitions. [2018-06-26 21:23:40,263 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-06-26 21:23:40,263 INFO ]: Start accepts. Automaton has 9 states. Word has length 9 [2018-06-26 21:23:40,263 INFO ]: Finished accepts. some prefix is accepted. [2018-06-26 21:23:40,263 INFO ]: With dead ends: 15 [2018-06-26 21:23:40,263 INFO ]: Without dead ends: 15 [2018-06-26 21:23:40,264 INFO ]: 0 DeclaredPredicates, 20 GetRequests, 5 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=73, Invalid=109, Unknown=0, NotChecked=0, Total=182 [2018-06-26 21:23:40,264 INFO ]: Start minimizeSevpa. Operand 15 states. [2018-06-26 21:23:40,265 INFO ]: Finished minimizeSevpa. Reduced states from 15 to 11. [2018-06-26 21:23:40,265 INFO ]: Start removeUnreachable. Operand 11 states. [2018-06-26 21:23:40,265 INFO ]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2018-06-26 21:23:40,265 INFO ]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 9 [2018-06-26 21:23:40,265 INFO ]: Finished accepts. word is rejected. [2018-06-26 21:23:40,265 INFO ]: Abstraction has 11 states and 13 transitions. [2018-06-26 21:23:40,265 INFO ]: Interpolant automaton has 9 states. [2018-06-26 21:23:40,265 INFO ]: Start isEmpty. Operand 11 states and 13 transitions. [2018-06-26 21:23:40,266 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-26 21:23:40,266 INFO ]: Found error trace [2018-06-26 21:23:40,266 INFO ]: trace histogram [4, 1, 1, 1, 1, 1] [2018-06-26 21:23:40,266 INFO ]: === Iteration 7 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-26 21:23:40,266 INFO ]: Analyzing trace with hash 1325660194, now seen corresponding path program 2 times [2018-06-26 21:23:40,266 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-26 21:23:40,266 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-26 21:23:40,267 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-26 21:23:40,267 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-26 21:23:40,267 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-26 21:23:40,312 INFO ]: Conjunction of SSA is unsat [2018-06-26 21:23:40,940 WARN ]: Spent 404.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-06-26 21:23:41,751 WARN ]: Spent 738.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 13 [2018-06-26 21:23:41,768 INFO ]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-26 21:23:41,769 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-26 21:23:41,769 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 [2018-06-26 21:23:41,775 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-26 21:23:41,846 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-26 21:23:41,846 INFO ]: Conjunction of SSA is unsat [2018-06-26 21:23:41,849 INFO ]: Computing forward predicates... [2018-06-26 21:23:43,562 INFO ]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-26 21:23:43,581 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-26 21:23:43,582 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2018-06-26 21:23:43,582 INFO ]: Interpolant automaton has 8 states [2018-06-26 21:23:43,582 INFO ]: Constructing interpolant automaton starting with 8 interpolants. [2018-06-26 21:23:43,582 INFO ]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2018-06-26 21:23:43,582 INFO ]: Start difference. First operand 11 states and 13 transitions. Second operand 8 states. [2018-06-26 21:23:43,778 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-26 21:23:43,778 INFO ]: Finished difference Result 16 states and 18 transitions. [2018-06-26 21:23:43,827 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-06-26 21:23:43,827 INFO ]: Start accepts. Automaton has 8 states. Word has length 9 [2018-06-26 21:23:43,827 INFO ]: Finished accepts. some prefix is accepted. [2018-06-26 21:23:43,828 INFO ]: With dead ends: 16 [2018-06-26 21:23:43,828 INFO ]: Without dead ends: 16 [2018-06-26 21:23:43,828 INFO ]: 0 DeclaredPredicates, 20 GetRequests, 6 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2018-06-26 21:23:43,828 INFO ]: Start minimizeSevpa. Operand 16 states. [2018-06-26 21:23:43,829 INFO ]: Finished minimizeSevpa. Reduced states from 16 to 11. [2018-06-26 21:23:43,829 INFO ]: Start removeUnreachable. Operand 11 states. [2018-06-26 21:23:43,830 INFO ]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2018-06-26 21:23:43,830 INFO ]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 9 [2018-06-26 21:23:43,830 INFO ]: Finished accepts. word is rejected. [2018-06-26 21:23:43,830 INFO ]: Abstraction has 11 states and 13 transitions. [2018-06-26 21:23:43,830 INFO ]: Interpolant automaton has 8 states. [2018-06-26 21:23:43,830 INFO ]: Start isEmpty. Operand 11 states and 13 transitions. [2018-06-26 21:23:43,830 INFO ]: Finished isEmpty. Found accepting run of length 11 [2018-06-26 21:23:43,830 INFO ]: Found error trace [2018-06-26 21:23:43,830 INFO ]: trace histogram [5, 1, 1, 1, 1, 1] [2018-06-26 21:23:43,830 INFO ]: === Iteration 8 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-26 21:23:43,830 INFO ]: Analyzing trace with hash 1760262001, now seen corresponding path program 4 times [2018-06-26 21:23:43,830 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-26 21:23:43,830 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-26 21:23:43,831 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-26 21:23:43,831 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-26 21:23:43,831 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-26 21:23:43,885 INFO ]: Conjunction of SSA is unsat [2018-06-26 21:23:44,184 INFO ]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-26 21:23:44,184 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-26 21:23:44,184 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 [2018-06-26 21:23:44,192 INFO ]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-06-26 21:23:44,255 INFO ]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-06-26 21:23:44,255 INFO ]: Conjunction of SSA is unsat [2018-06-26 21:23:44,259 INFO ]: Computing forward predicates... Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown