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/NetBSD_g_Ctoc.c.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-14921ce [2018-06-25 01:18:29,386 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-25 01:18:29,389 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-25 01:18:29,402 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-25 01:18:29,403 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-25 01:18:29,404 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-25 01:18:29,407 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-25 01:18:29,409 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-25 01:18:29,411 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-25 01:18:29,411 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-25 01:18:29,413 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-25 01:18:29,413 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-25 01:18:29,414 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-25 01:18:29,415 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-06-25 01:18:29,416 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-25 01:18:29,417 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-25 01:18:29,420 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-25 01:18:29,433 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-25 01:18:29,435 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-25 01:18:29,436 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-25 01:18:29,437 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-25 01:18:29,439 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-06-25 01:18:29,449 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-25 01:18:29,449 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-25 01:18:29,450 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-25 01:18:29,450 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-25 01:18:29,451 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-25 01:18:29,451 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-25 01:18:29,452 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/chc/AutomizerCHC/AutomizerCHC_Goto.epf [2018-06-25 01:18:29,471 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-25 01:18:29,471 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-25 01:18:29,471 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-25 01:18:29,472 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-25 01:18:29,472 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-06-25 01:18:29,473 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-06-25 01:18:29,473 INFO L133 SettingsManager]: * Create interprocedural compositions=false [2018-06-25 01:18:29,473 INFO L133 SettingsManager]: * Use SBE=true [2018-06-25 01:18:29,473 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-25 01:18:29,473 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-25 01:18:29,474 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-25 01:18:29,474 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-25 01:18:29,474 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-25 01:18:29,474 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-25 01:18:29,474 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-25 01:18:29,475 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-25 01:18:29,475 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-25 01:18:29,475 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-25 01:18:29,475 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-25 01:18:29,475 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-25 01:18:29,475 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-25 01:18:29,477 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-25 01:18:29,477 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-25 01:18:29,520 INFO ]: Repository-Root is: /tmp [2018-06-25 01:18:29,532 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-25 01:18:29,535 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-25 01:18:29,536 INFO ]: Initializing SmtParser... [2018-06-25 01:18:29,537 INFO ]: SmtParser initialized [2018-06-25 01:18:29,537 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/ctigar/NetBSD_g_Ctoc.c.smt2 [2018-06-25 01:18:29,538 INFO ]: Parsing .smt2 file as a set of Horn Clauses No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2018-06-25 01:18:29,632 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/NetBSD_g_Ctoc.c.smt2 unknown [2018-06-25 01:18:29,983 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/NetBSD_g_Ctoc.c.smt2 [2018-06-25 01:18:29,989 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-25 01:18:29,998 INFO ]: Walking toolchain with 5 elements. [2018-06-25 01:18:29,998 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-25 01:18:29,998 INFO ]: Initializing ChcToBoogie... [2018-06-25 01:18:29,999 INFO ]: ChcToBoogie initialized [2018-06-25 01:18:30,002 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 25.06 01:18:29" (1/1) ... [2018-06-25 01:18:30,056 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:18:30 Unit [2018-06-25 01:18:30,056 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-25 01:18:30,057 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-25 01:18:30,057 INFO ]: Initializing Boogie Preprocessor... [2018-06-25 01:18:30,057 INFO ]: Boogie Preprocessor initialized [2018-06-25 01:18:30,077 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:18:30" (1/1) ... [2018-06-25 01:18:30,077 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:18:30" (1/1) ... [2018-06-25 01:18:30,086 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:18:30" (1/1) ... [2018-06-25 01:18:30,086 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:18:30" (1/1) ... [2018-06-25 01:18:30,102 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:18:30" (1/1) ... [2018-06-25 01:18:30,103 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:18:30" (1/1) ... [2018-06-25 01:18:30,105 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:18:30" (1/1) ... [2018-06-25 01:18:30,116 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-25 01:18:30,117 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-25 01:18:30,117 INFO ]: Initializing RCFGBuilder... [2018-06-25 01:18:30,117 INFO ]: RCFGBuilder initialized [2018-06-25 01:18:30,118 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:18:30" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2018-06-25 01:18:30,140 INFO ]: Specification and implementation of procedure gotoProc given in one single declaration [2018-06-25 01:18:30,140 INFO ]: Found specification of procedure gotoProc [2018-06-25 01:18:30,140 INFO ]: Found implementation of procedure gotoProc [2018-06-25 01:18:30,140 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-25 01:18:30,140 INFO ]: Found specification of procedure Ultimate.START [2018-06-25 01:18:30,140 INFO ]: Found implementation of procedure Ultimate.START Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-25 01:18:30,434 INFO ]: Using library mode [2018-06-25 01:18:30,434 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.06 01:18:30 BoogieIcfgContainer [2018-06-25 01:18:30,434 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-25 01:18:30,435 INFO ]: ------------------------BlockEncodingV2---------------------------- [2018-06-25 01:18:30,435 INFO ]: Initializing BlockEncodingV2... [2018-06-25 01:18:30,436 INFO ]: BlockEncodingV2 initialized [2018-06-25 01:18:30,436 INFO ]: Executing the observer BlockEncodingObserver from plugin BlockEncodingV2 for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.06 01:18:30" (1/1) ... [2018-06-25 01:18:30,456 INFO ]: Initial Icfg 10 locations, 10 edges [2018-06-25 01:18:30,457 INFO ]: Using Remove infeasible edges [2018-06-25 01:18:30,458 INFO ]: Using Maximize final states [2018-06-25 01:18:30,458 INFO ]: Using Minimize states even if more edges are added than removed.=false [2018-06-25 01:18:30,458 INFO ]: Using Minimize states using LBE with the strategy=MULTI [2018-06-25 01:18:30,460 INFO ]: Using Remove sink states [2018-06-25 01:18:30,461 INFO ]: Using Apply optimizations until nothing changes=true [2018-06-25 01:18:30,461 INFO ]: Using Use SBE [2018-06-25 01:18:30,466 WARN ]: expecting exponential blowup for input size 7 [2018-06-25 01:18:30,560 WARN ]: aborting because of expected exponential blowup for input size 51 [2018-06-25 01:18:30,569 WARN ]: aborting because of expected exponential blowup for input size 51 [2018-06-25 01:18:30,569 INFO ]: SBE split 1 edges [2018-06-25 01:18:30,575 INFO ]: Removed 2 edges and 2 locations because of local infeasibility [2018-06-25 01:18:30,578 INFO ]: 0 new accepting states [2018-06-25 01:18:30,683 INFO ]: Removed 8 edges and 2 locations by large block encoding [2018-06-25 01:18:30,685 INFO ]: Removed 0 edges and 0 locations by removing sink states [2018-06-25 01:18:30,686 INFO ]: Removed 0 edges and 0 locations because of local infeasibility [2018-06-25 01:18:30,686 INFO ]: 0 new accepting states [2018-06-25 01:18:30,686 INFO ]: Removed 0 edges and 0 locations by large block encoding [2018-06-25 01:18:30,686 INFO ]: Removed 0 edges and 0 locations by removing sink states [2018-06-25 01:18:30,686 INFO ]: Encoded RCFG 6 locations, 10 edges [2018-06-25 01:18:30,687 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.blockencoding CFG 25.06 01:18:30 BasicIcfg [2018-06-25 01:18:30,687 INFO ]: ------------------------ END BlockEncodingV2---------------------------- [2018-06-25 01:18:30,688 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-25 01:18:30,688 INFO ]: Initializing TraceAbstraction... [2018-06-25 01:18:30,693 INFO ]: TraceAbstraction initialized [2018-06-25 01:18:30,693 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 25.06 01:18:29" (1/4) ... [2018-06-25 01:18:30,694 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24146541 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 25.06 01:18:30, skipping insertion in model container [2018-06-25 01:18:30,694 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:18:30" (2/4) ... [2018-06-25 01:18:30,695 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24146541 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.06 01:18:30, skipping insertion in model container [2018-06-25 01:18:30,695 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.06 01:18:30" (3/4) ... [2018-06-25 01:18:30,695 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24146541 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.06 01:18:30, skipping insertion in model container [2018-06-25 01:18:30,695 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.blockencoding CFG 25.06 01:18:30" (4/4) ... [2018-06-25 01:18:30,696 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver_BEv2 [2018-06-25 01:18:30,707 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-25 01:18:30,715 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-25 01:18:30,752 INFO ]: Using default assertion order modulation [2018-06-25 01:18:30,753 INFO ]: Interprodecural is true [2018-06-25 01:18:30,753 INFO ]: Hoare is false [2018-06-25 01:18:30,753 INFO ]: Compute interpolants for FPandBP [2018-06-25 01:18:30,753 INFO ]: Backedges is TWOTRACK [2018-06-25 01:18:30,753 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-25 01:18:30,753 INFO ]: Difference is false [2018-06-25 01:18:30,753 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-25 01:18:30,753 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-25 01:18:30,765 INFO ]: Start isEmpty. Operand 6 states. [2018-06-25 01:18:30,777 INFO ]: Finished isEmpty. Found accepting run of length 6 [2018-06-25 01:18:30,778 INFO ]: Found error trace [2018-06-25 01:18:30,778 INFO ]: trace histogram [1, 1, 1, 1, 1] [2018-06-25 01:18:30,779 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 01:18:30,783 INFO ]: Analyzing trace with hash 35589957, now seen corresponding path program 1 times [2018-06-25 01:18:30,785 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 01:18:30,786 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 01:18:30,824 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:18:30,824 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 01:18:30,824 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:18:30,869 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:18:30,920 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:18:30,925 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-25 01:18:30,925 INFO ]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-06-25 01:18:30,927 INFO ]: Interpolant automaton has 3 states [2018-06-25 01:18:30,938 INFO ]: Constructing interpolant automaton starting with 3 interpolants. [2018-06-25 01:18:30,938 INFO ]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-06-25 01:18:30,941 INFO ]: Start difference. First operand 6 states. Second operand 3 states. [2018-06-25 01:18:31,045 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 01:18:31,046 INFO ]: Finished difference Result 7 states and 11 transitions. [2018-06-25 01:18:31,050 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-06-25 01:18:31,051 INFO ]: Start accepts. Automaton has 3 states. Word has length 5 [2018-06-25 01:18:31,052 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 01:18:31,062 INFO ]: With dead ends: 7 [2018-06-25 01:18:31,062 INFO ]: Without dead ends: 7 [2018-06-25 01:18:31,064 INFO ]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-06-25 01:18:31,080 INFO ]: Start minimizeSevpa. Operand 7 states. [2018-06-25 01:18:31,097 INFO ]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-06-25 01:18:31,098 INFO ]: Start removeUnreachable. Operand 7 states. [2018-06-25 01:18:31,099 INFO ]: Finished removeUnreachable. Reduced from 7 states to 7 states and 11 transitions. [2018-06-25 01:18:31,101 INFO ]: Start accepts. Automaton has 7 states and 11 transitions. Word has length 5 [2018-06-25 01:18:31,102 INFO ]: Finished accepts. word is rejected. [2018-06-25 01:18:31,102 INFO ]: Abstraction has 7 states and 11 transitions. [2018-06-25 01:18:31,102 INFO ]: Interpolant automaton has 3 states. [2018-06-25 01:18:31,102 INFO ]: Start isEmpty. Operand 7 states and 11 transitions. [2018-06-25 01:18:31,102 INFO ]: Finished isEmpty. Found accepting run of length 6 [2018-06-25 01:18:31,102 INFO ]: Found error trace [2018-06-25 01:18:31,102 INFO ]: trace histogram [1, 1, 1, 1, 1] [2018-06-25 01:18:31,103 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 01:18:31,103 INFO ]: Analyzing trace with hash 35619748, now seen corresponding path program 1 times [2018-06-25 01:18:31,103 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 01:18:31,103 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 01:18:31,104 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:18:31,104 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 01:18:31,104 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:18:31,114 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:18:31,182 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:18:31,182 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-25 01:18:31,182 INFO ]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-06-25 01:18:31,183 INFO ]: Interpolant automaton has 3 states [2018-06-25 01:18:31,183 INFO ]: Constructing interpolant automaton starting with 3 interpolants. [2018-06-25 01:18:31,184 INFO ]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-06-25 01:18:31,184 INFO ]: Start difference. First operand 7 states and 11 transitions. Second operand 3 states. [2018-06-25 01:18:31,307 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 01:18:31,307 INFO ]: Finished difference Result 8 states and 12 transitions. [2018-06-25 01:18:31,308 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-06-25 01:18:31,308 INFO ]: Start accepts. Automaton has 3 states. Word has length 5 [2018-06-25 01:18:31,308 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 01:18:31,308 INFO ]: With dead ends: 8 [2018-06-25 01:18:31,308 INFO ]: Without dead ends: 8 [2018-06-25 01:18:31,309 INFO ]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-06-25 01:18:31,309 INFO ]: Start minimizeSevpa. Operand 8 states. [2018-06-25 01:18:31,310 INFO ]: Finished minimizeSevpa. Reduced states from 8 to 7. [2018-06-25 01:18:31,310 INFO ]: Start removeUnreachable. Operand 7 states. [2018-06-25 01:18:31,310 INFO ]: Finished removeUnreachable. Reduced from 7 states to 7 states and 11 transitions. [2018-06-25 01:18:31,311 INFO ]: Start accepts. Automaton has 7 states and 11 transitions. Word has length 5 [2018-06-25 01:18:31,311 INFO ]: Finished accepts. word is rejected. [2018-06-25 01:18:31,311 INFO ]: Abstraction has 7 states and 11 transitions. [2018-06-25 01:18:31,311 INFO ]: Interpolant automaton has 3 states. [2018-06-25 01:18:31,311 INFO ]: Start isEmpty. Operand 7 states and 11 transitions. [2018-06-25 01:18:31,311 INFO ]: Finished isEmpty. Found accepting run of length 7 [2018-06-25 01:18:31,311 INFO ]: Found error trace [2018-06-25 01:18:31,311 INFO ]: trace histogram [1, 1, 1, 1, 1, 1] [2018-06-25 01:18:31,311 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 01:18:31,311 INFO ]: Analyzing trace with hash 1102763159, now seen corresponding path program 1 times [2018-06-25 01:18:31,311 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 01:18:31,311 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 01:18:31,313 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:18:31,313 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 01:18:31,313 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:18:31,377 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:18:31,524 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:18:31,525 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 01:18:31,525 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-25 01:18:31,531 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 01:18:31,576 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:18:31,582 INFO ]: Computing forward predicates... [2018-06-25 01:18:31,839 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:18:31,871 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 01:18:31,871 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-06-25 01:18:31,871 INFO ]: Interpolant automaton has 4 states [2018-06-25 01:18:31,872 INFO ]: Constructing interpolant automaton starting with 4 interpolants. [2018-06-25 01:18:31,872 INFO ]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-06-25 01:18:31,872 INFO ]: Start difference. First operand 7 states and 11 transitions. Second operand 4 states. [2018-06-25 01:18:32,058 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 01:18:32,058 INFO ]: Finished difference Result 9 states and 13 transitions. [2018-06-25 01:18:32,060 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-06-25 01:18:32,060 INFO ]: Start accepts. Automaton has 4 states. Word has length 6 [2018-06-25 01:18:32,060 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 01:18:32,060 INFO ]: With dead ends: 9 [2018-06-25 01:18:32,060 INFO ]: Without dead ends: 9 [2018-06-25 01:18:32,061 INFO ]: 0 DeclaredPredicates, 9 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-06-25 01:18:32,061 INFO ]: Start minimizeSevpa. Operand 9 states. [2018-06-25 01:18:32,062 INFO ]: Finished minimizeSevpa. Reduced states from 9 to 8. [2018-06-25 01:18:32,062 INFO ]: Start removeUnreachable. Operand 8 states. [2018-06-25 01:18:32,062 INFO ]: Finished removeUnreachable. Reduced from 8 states to 8 states and 12 transitions. [2018-06-25 01:18:32,062 INFO ]: Start accepts. Automaton has 8 states and 12 transitions. Word has length 6 [2018-06-25 01:18:32,062 INFO ]: Finished accepts. word is rejected. [2018-06-25 01:18:32,062 INFO ]: Abstraction has 8 states and 12 transitions. [2018-06-25 01:18:32,062 INFO ]: Interpolant automaton has 4 states. [2018-06-25 01:18:32,062 INFO ]: Start isEmpty. Operand 8 states and 12 transitions. [2018-06-25 01:18:32,063 INFO ]: Finished isEmpty. Found accepting run of length 7 [2018-06-25 01:18:32,063 INFO ]: Found error trace [2018-06-25 01:18:32,063 INFO ]: trace histogram [1, 1, 1, 1, 1, 1] [2018-06-25 01:18:32,063 INFO ]: === Iteration 4 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 01:18:32,063 INFO ]: Analyzing trace with hash 1103686680, now seen corresponding path program 1 times [2018-06-25 01:18:32,063 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 01:18:32,063 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 01:18:32,064 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:18:32,064 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 01:18:32,064 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:18:32,112 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:18:32,257 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:18:32,257 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 01:18:32,257 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 [2018-06-25 01:18:32,276 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 01:18:32,324 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:18:32,326 INFO ]: Computing forward predicates... [2018-06-25 01:18:32,548 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:18:32,567 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 01:18:32,567 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2018-06-25 01:18:32,567 INFO ]: Interpolant automaton has 5 states [2018-06-25 01:18:32,567 INFO ]: Constructing interpolant automaton starting with 5 interpolants. [2018-06-25 01:18:32,568 INFO ]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-06-25 01:18:32,568 INFO ]: Start difference. First operand 8 states and 12 transitions. Second operand 5 states. [2018-06-25 01:18:32,743 WARN ]: Spent 162.00 ms on a formula simplification. DAG size of input: 9 DAG size of output: 8 [2018-06-25 01:18:32,808 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 01:18:32,808 INFO ]: Finished difference Result 13 states and 17 transitions. [2018-06-25 01:18:32,808 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-06-25 01:18:32,808 INFO ]: Start accepts. Automaton has 5 states. Word has length 6 [2018-06-25 01:18:32,809 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 01:18:32,809 INFO ]: With dead ends: 13 [2018-06-25 01:18:32,809 INFO ]: Without dead ends: 13 [2018-06-25 01:18:32,809 INFO ]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2018-06-25 01:18:32,809 INFO ]: Start minimizeSevpa. Operand 13 states. [2018-06-25 01:18:32,811 INFO ]: Finished minimizeSevpa. Reduced states from 13 to 8. [2018-06-25 01:18:32,811 INFO ]: Start removeUnreachable. Operand 8 states. [2018-06-25 01:18:32,811 INFO ]: Finished removeUnreachable. Reduced from 8 states to 8 states and 12 transitions. [2018-06-25 01:18:32,811 INFO ]: Start accepts. Automaton has 8 states and 12 transitions. Word has length 6 [2018-06-25 01:18:32,811 INFO ]: Finished accepts. word is rejected. [2018-06-25 01:18:32,811 INFO ]: Abstraction has 8 states and 12 transitions. [2018-06-25 01:18:32,811 INFO ]: Interpolant automaton has 5 states. [2018-06-25 01:18:32,811 INFO ]: Start isEmpty. Operand 8 states and 12 transitions. [2018-06-25 01:18:32,812 INFO ]: Finished isEmpty. Found accepting run of length 8 [2018-06-25 01:18:32,812 INFO ]: Found error trace [2018-06-25 01:18:32,812 INFO ]: trace histogram [2, 1, 1, 1, 1, 1] [2018-06-25 01:18:32,812 INFO ]: === Iteration 5 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 01:18:32,812 INFO ]: Analyzing trace with hash -174605947, now seen corresponding path program 2 times [2018-06-25 01:18:32,812 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 01:18:32,812 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 01:18:32,813 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:18:32,813 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 01:18:32,813 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:18:32,845 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:18:32,954 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:18:32,954 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 01:18:32,954 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-25 01:18:32,961 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-25 01:18:33,010 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-25 01:18:33,010 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:18:33,013 INFO ]: Computing forward predicates... [2018-06-25 01:18:36,558 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:18:36,585 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 01:18:36,585 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2018-06-25 01:18:36,585 INFO ]: Interpolant automaton has 6 states [2018-06-25 01:18:36,585 INFO ]: Constructing interpolant automaton starting with 6 interpolants. [2018-06-25 01:18:36,585 INFO ]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-06-25 01:18:36,586 INFO ]: Start difference. First operand 8 states and 12 transitions. Second operand 6 states. [2018-06-25 01:18:36,671 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 01:18:36,671 INFO ]: Finished difference Result 12 states and 16 transitions. [2018-06-25 01:18:36,671 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-06-25 01:18:36,671 INFO ]: Start accepts. Automaton has 6 states. Word has length 7 [2018-06-25 01:18:36,671 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 01:18:36,672 INFO ]: With dead ends: 12 [2018-06-25 01:18:36,672 INFO ]: Without dead ends: 12 [2018-06-25 01:18:36,672 INFO ]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=26, Invalid=30, Unknown=0, NotChecked=0, Total=56 [2018-06-25 01:18:36,672 INFO ]: Start minimizeSevpa. Operand 12 states. [2018-06-25 01:18:36,674 INFO ]: Finished minimizeSevpa. Reduced states from 12 to 9. [2018-06-25 01:18:36,674 INFO ]: Start removeUnreachable. Operand 9 states. [2018-06-25 01:18:36,674 INFO ]: Finished removeUnreachable. Reduced from 9 states to 9 states and 13 transitions. [2018-06-25 01:18:36,674 INFO ]: Start accepts. Automaton has 9 states and 13 transitions. Word has length 7 [2018-06-25 01:18:36,674 INFO ]: Finished accepts. word is rejected. [2018-06-25 01:18:36,674 INFO ]: Abstraction has 9 states and 13 transitions. [2018-06-25 01:18:36,674 INFO ]: Interpolant automaton has 6 states. [2018-06-25 01:18:36,674 INFO ]: Start isEmpty. Operand 9 states and 13 transitions. [2018-06-25 01:18:36,674 INFO ]: Finished isEmpty. Found accepting run of length 8 [2018-06-25 01:18:36,674 INFO ]: Found error trace [2018-06-25 01:18:36,674 INFO ]: trace histogram [2, 1, 1, 1, 1, 1] [2018-06-25 01:18:36,674 INFO ]: === Iteration 6 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 01:18:36,675 INFO ]: Analyzing trace with hash -145976796, now seen corresponding path program 2 times [2018-06-25 01:18:36,675 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 01:18:36,675 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 01:18:36,675 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:18:36,675 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-25 01:18:36,675 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:18:36,714 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:18:36,920 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:18:36,920 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 01:18:36,920 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-25 01:18:36,934 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-25 01:18:36,961 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-25 01:18:36,961 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:18:36,964 INFO ]: Computing forward predicates... [2018-06-25 01:18:38,588 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:18:38,623 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 01:18:38,623 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2018-06-25 01:18:38,623 INFO ]: Interpolant automaton has 6 states [2018-06-25 01:18:38,623 INFO ]: Constructing interpolant automaton starting with 6 interpolants. [2018-06-25 01:18:38,624 INFO ]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2018-06-25 01:18:38,624 INFO ]: Start difference. First operand 9 states and 13 transitions. Second operand 6 states. [2018-06-25 01:18:39,242 WARN ]: Spent 508.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-06-25 01:18:39,389 WARN ]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 6 [2018-06-25 01:18:39,523 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 01:18:39,523 INFO ]: Finished difference Result 13 states and 17 transitions. [2018-06-25 01:18:39,524 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-06-25 01:18:39,524 INFO ]: Start accepts. Automaton has 6 states. Word has length 7 [2018-06-25 01:18:39,524 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 01:18:39,524 INFO ]: With dead ends: 13 [2018-06-25 01:18:39,524 INFO ]: Without dead ends: 13 [2018-06-25 01:18:39,524 INFO ]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2018-06-25 01:18:39,524 INFO ]: Start minimizeSevpa. Operand 13 states. [2018-06-25 01:18:39,525 INFO ]: Finished minimizeSevpa. Reduced states from 13 to 9. [2018-06-25 01:18:39,525 INFO ]: Start removeUnreachable. Operand 9 states. [2018-06-25 01:18:39,526 INFO ]: Finished removeUnreachable. Reduced from 9 states to 9 states and 13 transitions. [2018-06-25 01:18:39,526 INFO ]: Start accepts. Automaton has 9 states and 13 transitions. Word has length 7 [2018-06-25 01:18:39,526 INFO ]: Finished accepts. word is rejected. [2018-06-25 01:18:39,526 INFO ]: Abstraction has 9 states and 13 transitions. [2018-06-25 01:18:39,526 INFO ]: Interpolant automaton has 6 states. [2018-06-25 01:18:39,526 INFO ]: Start isEmpty. Operand 9 states and 13 transitions. [2018-06-25 01:18:39,526 INFO ]: Finished isEmpty. Found accepting run of length 9 [2018-06-25 01:18:39,526 INFO ]: Found error trace [2018-06-25 01:18:39,526 INFO ]: trace histogram [3, 1, 1, 1, 1, 1] [2018-06-25 01:18:39,526 INFO ]: === Iteration 7 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 01:18:39,526 INFO ]: Analyzing trace with hash -1118342569, now seen corresponding path program 3 times [2018-06-25 01:18:39,526 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 01:18:39,527 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 01:18:39,527 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:18:39,527 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-25 01:18:39,527 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:18:39,573 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:18:40,299 WARN ]: Spent 513.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2018-06-25 01:18:40,502 WARN ]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-06-25 01:18:40,525 INFO ]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:18:40,525 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 01:18:40,525 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-25 01:18:40,531 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-25 01:18:40,591 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-06-25 01:18:40,591 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:18:40,593 INFO ]: Computing forward predicates... Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown