java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data --generate-csv --csv-dir csv -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/functions1.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-bd42740 [2018-09-23 21:26:19,457 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-23 21:26:19,459 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-23 21:26:19,471 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-23 21:26:19,471 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-23 21:26:19,472 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-23 21:26:19,474 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-23 21:26:19,476 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-23 21:26:19,478 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-23 21:26:19,478 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-23 21:26:19,479 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-09-23 21:26:19,508 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf [2018-09-23 21:26:19,523 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-23 21:26:19,524 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-23 21:26:19,525 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-23 21:26:19,525 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-09-23 21:26:19,526 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-09-23 21:26:19,526 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-09-23 21:26:19,526 INFO L133 SettingsManager]: * Use SBE=true [2018-09-23 21:26:19,526 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-23 21:26:19,526 INFO L133 SettingsManager]: * sizeof long=4 [2018-09-23 21:26:19,527 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-23 21:26:19,527 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-09-23 21:26:19,527 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-23 21:26:19,527 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-23 21:26:19,528 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-23 21:26:19,528 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-23 21:26:19,528 INFO L133 SettingsManager]: * sizeof long double=12 [2018-09-23 21:26:19,528 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-23 21:26:19,528 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-23 21:26:19,529 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-23 21:26:19,529 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-23 21:26:19,529 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-23 21:26:19,529 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-23 21:26:19,529 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-23 21:26:19,530 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-23 21:26:19,530 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-23 21:26:19,530 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-23 21:26:19,530 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-09-23 21:26:19,530 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-23 21:26:19,531 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-23 21:26:19,531 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-23 21:26:19,581 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-23 21:26:19,595 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-23 21:26:19,598 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-23 21:26:19,600 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-23 21:26:19,601 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-23 21:26:19,602 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/functions1.i_3.bpl [2018-09-23 21:26:19,602 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/functions1.i_3.bpl' [2018-09-23 21:26:19,674 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-23 21:26:19,678 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-23 21:26:19,678 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-23 21:26:19,679 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-23 21:26:19,679 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-23 21:26:19,699 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:26:19" (1/1) ... [2018-09-23 21:26:19,712 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:26:19" (1/1) ... [2018-09-23 21:26:19,720 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-23 21:26:19,721 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-23 21:26:19,721 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-23 21:26:19,721 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-23 21:26:19,733 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:26:19" (1/1) ... [2018-09-23 21:26:19,734 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:26:19" (1/1) ... [2018-09-23 21:26:19,734 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:26:19" (1/1) ... [2018-09-23 21:26:19,735 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:26:19" (1/1) ... [2018-09-23 21:26:19,738 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:26:19" (1/1) ... [2018-09-23 21:26:19,740 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:26:19" (1/1) ... [2018-09-23 21:26:19,740 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:26:19" (1/1) ... [2018-09-23 21:26:19,742 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-23 21:26:19,743 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-23 21:26:19,743 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-23 21:26:19,743 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-23 21:26:19,744 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:26:19" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 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 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-23 21:26:19,830 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-23 21:26:19,830 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-23 21:26:20,032 INFO L354 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-23 21:26:20,032 INFO L202 PluginConnector]: Adding new model functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.09 09:26:20 BoogieIcfgContainer [2018-09-23 21:26:20,032 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-23 21:26:20,034 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-23 21:26:20,034 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-23 21:26:20,037 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-23 21:26:20,038 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:26:19" (1/2) ... [2018-09-23 21:26:20,039 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@562e365a and model type functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.09 09:26:20, skipping insertion in model container [2018-09-23 21:26:20,039 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.09 09:26:20" (2/2) ... [2018-09-23 21:26:20,041 INFO L112 eAbstractionObserver]: Analyzing ICFG functions1.i_3.bpl [2018-09-23 21:26:20,051 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-23 21:26:20,059 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-23 21:26:20,111 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-23 21:26:20,112 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-23 21:26:20,112 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-23 21:26:20,113 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-23 21:26:20,113 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-23 21:26:20,113 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-23 21:26:20,113 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-23 21:26:20,113 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-23 21:26:20,114 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-23 21:26:20,129 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-09-23 21:26:20,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-09-23 21:26:20,136 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:26:20,138 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-09-23 21:26:20,139 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:26:20,145 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:26:20,146 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2018-09-23 21:26:20,148 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:26:20,149 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:26:20,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:20,208 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:26:20,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:20,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:20,357 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:20,360 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-23 21:26:20,360 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-23 21:26:20,365 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-23 21:26:20,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-23 21:26:20,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-23 21:26:20,382 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-09-23 21:26:20,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:26:20,426 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-09-23 21:26:20,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-23 21:26:20,428 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-09-23 21:26:20,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:26:20,440 INFO L225 Difference]: With dead ends: 11 [2018-09-23 21:26:20,440 INFO L226 Difference]: Without dead ends: 7 [2018-09-23 21:26:20,444 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-23 21:26:20,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-09-23 21:26:20,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-09-23 21:26:20,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-09-23 21:26:20,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-09-23 21:26:20,514 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-09-23 21:26:20,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:26:20,515 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-09-23 21:26:20,515 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-23 21:26:20,515 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-09-23 21:26:20,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-09-23 21:26:20,516 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:26:20,516 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-09-23 21:26:20,517 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:26:20,517 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:26:20,517 INFO L82 PathProgramCache]: Analyzing trace with hash 889591169, now seen corresponding path program 1 times [2018-09-23 21:26:20,518 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:26:20,518 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:26:20,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:20,525 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:26:20,525 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:20,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:20,685 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:20,685 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:26:20,685 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:26:20,700 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:26:20,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:20,730 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:26:20,802 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:20,824 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:26:20,824 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-09-23 21:26:20,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-23 21:26:20,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-23 21:26:20,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-09-23 21:26:20,826 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 4 states. [2018-09-23 21:26:20,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:26:20,876 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-09-23 21:26:20,878 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-23 21:26:20,878 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-09-23 21:26:20,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:26:20,878 INFO L225 Difference]: With dead ends: 11 [2018-09-23 21:26:20,879 INFO L226 Difference]: Without dead ends: 9 [2018-09-23 21:26:20,881 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-09-23 21:26:20,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-09-23 21:26:20,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-09-23 21:26:20,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-09-23 21:26:20,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-09-23 21:26:20,885 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-09-23 21:26:20,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:26:20,885 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-09-23 21:26:20,885 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-23 21:26:20,886 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-09-23 21:26:20,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-09-23 21:26:20,886 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:26:20,886 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1] [2018-09-23 21:26:20,887 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:26:20,887 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:26:20,887 INFO L82 PathProgramCache]: Analyzing trace with hash 198673595, now seen corresponding path program 2 times [2018-09-23 21:26:20,887 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:26:20,887 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:26:20,888 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:20,889 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:26:20,889 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:20,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:21,070 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:21,071 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:26:21,071 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/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) [2018-09-23 21:26:21,085 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:26:21,119 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:26:21,120 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:26:21,122 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:26:21,142 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:21,164 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:26:21,164 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-09-23 21:26:21,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-23 21:26:21,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-23 21:26:21,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-09-23 21:26:21,165 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 5 states. [2018-09-23 21:26:21,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:26:21,222 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-09-23 21:26:21,225 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-23 21:26:21,225 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2018-09-23 21:26:21,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:26:21,226 INFO L225 Difference]: With dead ends: 13 [2018-09-23 21:26:21,226 INFO L226 Difference]: Without dead ends: 11 [2018-09-23 21:26:21,227 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-09-23 21:26:21,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-23 21:26:21,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-09-23 21:26:21,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-09-23 21:26:21,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-09-23 21:26:21,234 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-09-23 21:26:21,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:26:21,235 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-09-23 21:26:21,235 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-23 21:26:21,235 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-09-23 21:26:21,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-23 21:26:21,236 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:26:21,236 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1] [2018-09-23 21:26:21,237 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:26:21,237 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:26:21,238 INFO L82 PathProgramCache]: Analyzing trace with hash 1946815861, now seen corresponding path program 3 times [2018-09-23 21:26:21,238 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:26:21,238 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:26:21,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:21,240 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:26:21,241 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:21,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:21,631 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:21,632 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:26:21,632 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/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 [2018-09-23 21:26:21,641 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:26:21,701 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-23 21:26:21,702 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:26:21,704 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:26:21,720 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:21,742 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:26:21,742 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-09-23 21:26:21,742 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-23 21:26:21,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-23 21:26:21,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-23 21:26:21,743 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 6 states. [2018-09-23 21:26:21,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:26:21,802 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-09-23 21:26:21,802 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-23 21:26:21,803 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2018-09-23 21:26:21,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:26:21,803 INFO L225 Difference]: With dead ends: 15 [2018-09-23 21:26:21,805 INFO L226 Difference]: Without dead ends: 13 [2018-09-23 21:26:21,806 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-23 21:26:21,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-09-23 21:26:21,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-09-23 21:26:21,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-09-23 21:26:21,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-09-23 21:26:21,812 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-09-23 21:26:21,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:26:21,812 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-09-23 21:26:21,812 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-23 21:26:21,813 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-09-23 21:26:21,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-09-23 21:26:21,813 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:26:21,813 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2018-09-23 21:26:21,814 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:26:21,814 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:26:21,814 INFO L82 PathProgramCache]: Analyzing trace with hash -1715646545, now seen corresponding path program 4 times [2018-09-23 21:26:21,814 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:26:21,814 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:26:21,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:21,816 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:26:21,816 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:21,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:22,025 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:22,025 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:26:22,026 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/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 [2018-09-23 21:26:22,037 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:26:22,073 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:26:22,073 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:26:22,076 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:26:22,100 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:22,121 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:26:22,121 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-09-23 21:26:22,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-23 21:26:22,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-23 21:26:22,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-09-23 21:26:22,122 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 7 states. [2018-09-23 21:26:22,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:26:22,181 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-09-23 21:26:22,181 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-23 21:26:22,181 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2018-09-23 21:26:22,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:26:22,182 INFO L225 Difference]: With dead ends: 17 [2018-09-23 21:26:22,182 INFO L226 Difference]: Without dead ends: 15 [2018-09-23 21:26:22,183 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-09-23 21:26:22,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-09-23 21:26:22,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-09-23 21:26:22,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-09-23 21:26:22,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-09-23 21:26:22,188 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-09-23 21:26:22,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:26:22,188 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-09-23 21:26:22,188 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-23 21:26:22,188 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-09-23 21:26:22,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-23 21:26:22,189 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:26:22,189 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1] [2018-09-23 21:26:22,190 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:26:22,190 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:26:22,190 INFO L82 PathProgramCache]: Analyzing trace with hash 531164009, now seen corresponding path program 5 times [2018-09-23 21:26:22,190 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:26:22,190 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:26:22,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:22,191 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:26:22,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:22,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:22,497 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:22,497 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:26:22,498 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/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 [2018-09-23 21:26:22,509 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 21:26:22,848 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-23 21:26:22,849 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:26:22,852 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:26:22,869 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:22,898 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:26:22,898 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-09-23 21:26:22,898 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-23 21:26:22,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-23 21:26:22,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-09-23 21:26:22,899 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2018-09-23 21:26:23,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:26:23,280 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-09-23 21:26:23,281 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-23 21:26:23,281 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2018-09-23 21:26:23,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:26:23,282 INFO L225 Difference]: With dead ends: 19 [2018-09-23 21:26:23,282 INFO L226 Difference]: Without dead ends: 17 [2018-09-23 21:26:23,283 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-09-23 21:26:23,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-09-23 21:26:23,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-09-23 21:26:23,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-09-23 21:26:23,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-09-23 21:26:23,287 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-09-23 21:26:23,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:26:23,288 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-09-23 21:26:23,288 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-23 21:26:23,288 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-09-23 21:26:23,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-09-23 21:26:23,289 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:26:23,289 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1] [2018-09-23 21:26:23,289 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:26:23,290 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:26:23,290 INFO L82 PathProgramCache]: Analyzing trace with hash -652443485, now seen corresponding path program 6 times [2018-09-23 21:26:23,290 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:26:23,290 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:26:23,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:23,291 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:26:23,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:23,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:23,527 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:23,528 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:26:23,528 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/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 [2018-09-23 21:26:23,542 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 21:26:23,571 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-23 21:26:23,571 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:26:23,574 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:26:23,620 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:23,645 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:26:23,645 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-09-23 21:26:23,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-23 21:26:23,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-23 21:26:23,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-09-23 21:26:23,646 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2018-09-23 21:26:23,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:26:23,756 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-09-23 21:26:23,759 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-23 21:26:23,759 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2018-09-23 21:26:23,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:26:23,760 INFO L225 Difference]: With dead ends: 21 [2018-09-23 21:26:23,760 INFO L226 Difference]: Without dead ends: 19 [2018-09-23 21:26:23,761 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-09-23 21:26:23,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-23 21:26:23,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-09-23 21:26:23,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-23 21:26:23,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-09-23 21:26:23,765 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-09-23 21:26:23,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:26:23,766 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-09-23 21:26:23,766 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-23 21:26:23,766 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-09-23 21:26:23,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-09-23 21:26:23,767 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:26:23,767 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1] [2018-09-23 21:26:23,767 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:26:23,768 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:26:23,768 INFO L82 PathProgramCache]: Analyzing trace with hash 67088221, now seen corresponding path program 7 times [2018-09-23 21:26:23,768 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:26:23,768 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:26:23,769 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:23,769 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:26:23,769 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:23,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:24,420 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:24,420 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:26:24,421 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/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 [2018-09-23 21:26:24,429 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:26:24,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:24,451 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:26:24,473 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:24,493 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:26:24,494 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-09-23 21:26:24,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-23 21:26:24,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-23 21:26:24,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-09-23 21:26:24,495 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2018-09-23 21:26:24,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:26:24,647 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-09-23 21:26:24,648 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-23 21:26:24,648 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2018-09-23 21:26:24,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:26:24,649 INFO L225 Difference]: With dead ends: 23 [2018-09-23 21:26:24,650 INFO L226 Difference]: Without dead ends: 21 [2018-09-23 21:26:24,650 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-09-23 21:26:24,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-09-23 21:26:24,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-09-23 21:26:24,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-09-23 21:26:24,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-09-23 21:26:24,656 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-09-23 21:26:24,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:26:24,656 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-09-23 21:26:24,657 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-23 21:26:24,657 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-09-23 21:26:24,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-23 21:26:24,657 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:26:24,658 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1] [2018-09-23 21:26:24,658 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:26:24,658 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:26:24,658 INFO L82 PathProgramCache]: Analyzing trace with hash 47323031, now seen corresponding path program 8 times [2018-09-23 21:26:24,658 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:26:24,658 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:26:24,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:24,659 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:26:24,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:24,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:24,997 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:24,997 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:26:24,998 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:26:25,010 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:26:25,044 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:26:25,044 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:26:25,047 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:26:25,066 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:25,088 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:26:25,088 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-09-23 21:26:25,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-23 21:26:25,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-23 21:26:25,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-09-23 21:26:25,090 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 11 states. [2018-09-23 21:26:25,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:26:25,241 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-09-23 21:26:25,242 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-23 21:26:25,242 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-09-23 21:26:25,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:26:25,244 INFO L225 Difference]: With dead ends: 25 [2018-09-23 21:26:25,244 INFO L226 Difference]: Without dead ends: 23 [2018-09-23 21:26:25,244 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-09-23 21:26:25,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-09-23 21:26:25,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-09-23 21:26:25,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-09-23 21:26:25,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-09-23 21:26:25,250 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-09-23 21:26:25,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:26:25,251 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-09-23 21:26:25,251 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-23 21:26:25,251 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-09-23 21:26:25,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-09-23 21:26:25,252 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:26:25,252 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1] [2018-09-23 21:26:25,252 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:26:25,252 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:26:25,253 INFO L82 PathProgramCache]: Analyzing trace with hash -1767155375, now seen corresponding path program 9 times [2018-09-23 21:26:25,253 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:26:25,253 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:26:25,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:25,254 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:26:25,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:25,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:25,530 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:25,530 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:26:25,531 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:26:25,543 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:26:45,209 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-23 21:26:45,209 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:26:45,233 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:26:45,282 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:45,313 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:26:45,314 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-09-23 21:26:45,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-23 21:26:45,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-23 21:26:45,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-09-23 21:26:45,315 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 12 states. [2018-09-23 21:26:45,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:26:45,450 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-09-23 21:26:45,451 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-23 21:26:45,451 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2018-09-23 21:26:45,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:26:45,452 INFO L225 Difference]: With dead ends: 27 [2018-09-23 21:26:45,452 INFO L226 Difference]: Without dead ends: 25 [2018-09-23 21:26:45,453 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-09-23 21:26:45,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-09-23 21:26:45,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-09-23 21:26:45,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-09-23 21:26:45,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-09-23 21:26:45,458 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-09-23 21:26:45,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:26:45,458 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-09-23 21:26:45,459 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-23 21:26:45,459 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-09-23 21:26:45,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-09-23 21:26:45,459 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:26:45,460 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1] [2018-09-23 21:26:45,460 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:26:45,460 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:26:45,460 INFO L82 PathProgramCache]: Analyzing trace with hash -1724181365, now seen corresponding path program 10 times [2018-09-23 21:26:45,460 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:26:45,460 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:26:45,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:45,461 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:26:45,462 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:45,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:45,771 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:45,772 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:26:45,772 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:26:45,780 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:26:45,803 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:26:45,803 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:26:45,806 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:26:45,831 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:45,852 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:26:45,852 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-09-23 21:26:45,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-23 21:26:45,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-23 21:26:45,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-09-23 21:26:45,853 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 13 states. [2018-09-23 21:26:46,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:26:46,102 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-09-23 21:26:46,103 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-23 21:26:46,103 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2018-09-23 21:26:46,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:26:46,104 INFO L225 Difference]: With dead ends: 29 [2018-09-23 21:26:46,104 INFO L226 Difference]: Without dead ends: 27 [2018-09-23 21:26:46,105 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-09-23 21:26:46,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-23 21:26:46,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-09-23 21:26:46,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-09-23 21:26:46,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-09-23 21:26:46,111 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-09-23 21:26:46,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:26:46,112 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-09-23 21:26:46,112 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-23 21:26:46,112 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-09-23 21:26:46,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-09-23 21:26:46,113 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:26:46,113 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1] [2018-09-23 21:26:46,114 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:26:46,114 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:26:46,114 INFO L82 PathProgramCache]: Analyzing trace with hash 919136581, now seen corresponding path program 11 times [2018-09-23 21:26:46,114 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:26:46,114 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:26:46,115 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:46,115 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:26:46,115 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:46,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:46,405 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:46,406 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:26:46,406 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:26:46,414 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 21:27:45,684 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-23 21:27:45,684 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:27:45,742 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:27:45,795 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:27:45,799 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:27:45,800 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-09-23 21:27:45,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-23 21:27:45,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-23 21:27:45,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-09-23 21:27:45,801 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 14 states. [2018-09-23 21:27:46,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:27:46,124 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-09-23 21:27:46,128 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-23 21:27:46,128 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 26 [2018-09-23 21:27:46,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:27:46,128 INFO L225 Difference]: With dead ends: 31 [2018-09-23 21:27:46,129 INFO L226 Difference]: Without dead ends: 29 [2018-09-23 21:27:46,129 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-09-23 21:27:46,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-09-23 21:27:46,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-09-23 21:27:46,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-09-23 21:27:46,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-09-23 21:27:46,134 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-09-23 21:27:46,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:27:46,134 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-09-23 21:27:46,134 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-23 21:27:46,134 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-09-23 21:27:46,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-09-23 21:27:46,135 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:27:46,135 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1] [2018-09-23 21:27:46,135 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:27:46,136 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:27:46,136 INFO L82 PathProgramCache]: Analyzing trace with hash -1472956545, now seen corresponding path program 12 times [2018-09-23 21:27:46,136 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:27:46,136 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:27:46,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:27:46,137 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:27:46,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:27:46,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:27:46,899 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:27:46,899 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:27:46,899 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-09-23 21:27:46,916 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:28:07,097 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-23 21:28:07,098 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:28:07,154 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:28:07,238 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:28:07,260 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:28:07,260 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-09-23 21:28:07,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-23 21:28:07,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-23 21:28:07,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-09-23 21:28:07,261 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2018-09-23 21:28:08,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:28:08,070 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-09-23 21:28:08,070 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-23 21:28:08,070 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2018-09-23 21:28:08,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:28:08,071 INFO L225 Difference]: With dead ends: 33 [2018-09-23 21:28:08,071 INFO L226 Difference]: Without dead ends: 31 [2018-09-23 21:28:08,072 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-09-23 21:28:08,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-09-23 21:28:08,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-09-23 21:28:08,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-09-23 21:28:08,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-09-23 21:28:08,079 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-09-23 21:28:08,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:28:08,079 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-09-23 21:28:08,079 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-23 21:28:08,079 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-09-23 21:28:08,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-09-23 21:28:08,080 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:28:08,080 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1] [2018-09-23 21:28:08,080 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:28:08,081 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:28:08,081 INFO L82 PathProgramCache]: Analyzing trace with hash 1828020025, now seen corresponding path program 13 times [2018-09-23 21:28:08,081 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:28:08,081 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:28:08,082 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:28:08,082 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:28:08,082 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:28:08,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:28:08,372 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:28:08,372 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:28:08,373 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:28:08,381 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:28:08,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:28:08,409 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:28:08,429 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:28:08,450 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:28:08,450 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-09-23 21:28:08,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-23 21:28:08,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-23 21:28:08,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-09-23 21:28:08,451 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 16 states. [2018-09-23 21:28:08,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:28:08,624 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-09-23 21:28:08,624 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-23 21:28:08,624 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 30 [2018-09-23 21:28:08,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:28:08,625 INFO L225 Difference]: With dead ends: 35 [2018-09-23 21:28:08,625 INFO L226 Difference]: Without dead ends: 33 [2018-09-23 21:28:08,626 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-09-23 21:28:08,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-09-23 21:28:08,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-09-23 21:28:08,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-09-23 21:28:08,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-09-23 21:28:08,633 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-09-23 21:28:08,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:28:08,633 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-09-23 21:28:08,633 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-23 21:28:08,633 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-09-23 21:28:08,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-09-23 21:28:08,634 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:28:08,634 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1] [2018-09-23 21:28:08,634 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:28:08,635 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:28:08,635 INFO L82 PathProgramCache]: Analyzing trace with hash 85672051, now seen corresponding path program 14 times [2018-09-23 21:28:08,635 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:28:08,635 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:28:08,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:28:08,636 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:28:08,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:28:08,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:28:09,021 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:28:09,021 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:28:09,022 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:28:09,031 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:28:09,064 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:28:09,065 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:28:09,068 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:28:09,102 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:28:09,131 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:28:09,131 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-09-23 21:28:09,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-23 21:28:09,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-23 21:28:09,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-09-23 21:28:09,132 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 17 states. [2018-09-23 21:28:09,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:28:09,523 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-09-23 21:28:09,523 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-23 21:28:09,524 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2018-09-23 21:28:09,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:28:09,525 INFO L225 Difference]: With dead ends: 37 [2018-09-23 21:28:09,525 INFO L226 Difference]: Without dead ends: 35 [2018-09-23 21:28:09,526 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-09-23 21:28:09,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-09-23 21:28:09,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-09-23 21:28:09,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-09-23 21:28:09,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-09-23 21:28:09,531 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-09-23 21:28:09,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:28:09,532 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-09-23 21:28:09,532 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-23 21:28:09,532 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-09-23 21:28:09,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-09-23 21:28:09,533 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:28:09,533 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1] [2018-09-23 21:28:09,533 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:28:09,533 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:28:09,533 INFO L82 PathProgramCache]: Analyzing trace with hash 726514477, now seen corresponding path program 15 times [2018-09-23 21:28:09,534 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:28:09,534 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:28:09,534 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:28:09,534 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:28:09,535 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:28:09,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:28:10,243 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:28:10,244 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:28:10,244 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:28:10,252 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:28:36,147 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-23 21:28:36,148 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:28:36,239 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:28:36,272 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:28:36,303 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:28:36,303 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-09-23 21:28:36,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-23 21:28:36,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-23 21:28:36,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-09-23 21:28:36,304 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 18 states. [2018-09-23 21:28:36,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:28:36,548 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-09-23 21:28:36,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-23 21:28:36,551 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 34 [2018-09-23 21:28:36,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:28:36,551 INFO L225 Difference]: With dead ends: 39 [2018-09-23 21:28:36,551 INFO L226 Difference]: Without dead ends: 37 [2018-09-23 21:28:36,552 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-09-23 21:28:36,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-09-23 21:28:36,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-09-23 21:28:36,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-09-23 21:28:36,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-09-23 21:28:36,557 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-09-23 21:28:36,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:28:36,557 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-09-23 21:28:36,558 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-23 21:28:36,558 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-09-23 21:28:36,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-09-23 21:28:36,558 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:28:36,559 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1] [2018-09-23 21:28:36,559 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:28:36,559 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:28:36,559 INFO L82 PathProgramCache]: Analyzing trace with hash -1899204761, now seen corresponding path program 16 times [2018-09-23 21:28:36,559 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:28:36,559 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:28:36,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:28:36,560 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:28:36,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:28:36,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:28:37,055 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:28:37,055 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:28:37,055 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:28:37,062 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:28:37,091 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:28:37,092 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:28:37,095 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:28:37,112 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:28:37,139 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:28:37,139 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-09-23 21:28:37,140 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-23 21:28:37,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-23 21:28:37,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-09-23 21:28:37,140 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 19 states. [2018-09-23 21:28:37,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:28:37,381 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-09-23 21:28:37,384 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-23 21:28:37,384 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 36 [2018-09-23 21:28:37,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:28:37,385 INFO L225 Difference]: With dead ends: 41 [2018-09-23 21:28:37,385 INFO L226 Difference]: Without dead ends: 39 [2018-09-23 21:28:37,386 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-09-23 21:28:37,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-09-23 21:28:37,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-09-23 21:28:37,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-09-23 21:28:37,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-09-23 21:28:37,392 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-09-23 21:28:37,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:28:37,392 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-09-23 21:28:37,392 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-23 21:28:37,392 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-09-23 21:28:37,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-09-23 21:28:37,393 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:28:37,393 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1] [2018-09-23 21:28:37,394 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:28:37,394 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:28:37,394 INFO L82 PathProgramCache]: Analyzing trace with hash 225377569, now seen corresponding path program 17 times [2018-09-23 21:28:37,394 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:28:37,394 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:28:37,395 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:28:37,395 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:28:37,395 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:28:37,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:28:38,241 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:28:38,241 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:28:38,242 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:28:38,250 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 21:30:12,341 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-09-23 21:30:12,341 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:30:12,451 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:30:12,499 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:30:12,524 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:30:12,524 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-09-23 21:30:12,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-23 21:30:12,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-23 21:30:12,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-09-23 21:30:12,525 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 20 states. [2018-09-23 21:30:12,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:30:12,812 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-09-23 21:30:12,813 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-09-23 21:30:12,813 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 38 [2018-09-23 21:30:12,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:30:12,814 INFO L225 Difference]: With dead ends: 43 [2018-09-23 21:30:12,814 INFO L226 Difference]: Without dead ends: 41 [2018-09-23 21:30:12,815 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-09-23 21:30:12,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-09-23 21:30:12,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-09-23 21:30:12,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-09-23 21:30:12,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-09-23 21:30:12,822 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-09-23 21:30:12,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:30:12,822 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-09-23 21:30:12,822 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-23 21:30:12,822 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-09-23 21:30:12,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-09-23 21:30:12,823 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:30:12,823 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1] [2018-09-23 21:30:12,824 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:30:12,824 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:30:12,824 INFO L82 PathProgramCache]: Analyzing trace with hash 1839531099, now seen corresponding path program 18 times [2018-09-23 21:30:12,824 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:30:12,824 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:30:12,828 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:30:12,828 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:30:12,828 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:30:12,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:30:13,582 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:30:13,582 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:30:13,582 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:30:13,589 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown