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/nested1.i_4.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-c372c2b [2018-10-02 11:47:21,671 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-02 11:47:21,673 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-02 11:47:21,685 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2018-10-02 11:47:21,733 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 [2018-10-02 11:47:21,748 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-02 11:47:21,748 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-02 11:47:21,749 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-02 11:47:21,749 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-02 11:47:21,750 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-02 11:47:21,750 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-02 11:47:21,750 INFO L133 SettingsManager]: * Use SBE=true [2018-10-02 11:47:21,750 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-02 11:47:21,751 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-02 11:47:21,751 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-02 11:47:21,751 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-02 11:47:21,751 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-02 11:47:21,751 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-02 11:47:21,752 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-02 11:47:21,752 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-02 11:47:21,752 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-02 11:47:21,752 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-02 11:47:21,752 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-02 11:47:21,753 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-02 11:47:21,753 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-02 11:47:21,753 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-02 11:47:21,753 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-02 11:47:21,753 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-02 11:47:21,754 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-02 11:47:21,754 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-02 11:47:21,754 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-02 11:47:21,754 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-02 11:47:21,754 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-02 11:47:21,755 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-02 11:47:21,755 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-02 11:47:21,802 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-02 11:47:21,815 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-02 11:47:21,819 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-02 11:47:21,820 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-10-02 11:47:21,821 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-10-02 11:47:21,822 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/nested1.i_4.bpl [2018-10-02 11:47:21,822 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/nested1.i_4.bpl' [2018-10-02 11:47:21,874 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-02 11:47:21,877 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-10-02 11:47:21,878 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-02 11:47:21,878 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-02 11:47:21,879 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-02 11:47:21,899 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:47:21" (1/1) ... [2018-10-02 11:47:21,911 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:47:21" (1/1) ... [2018-10-02 11:47:21,917 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-02 11:47:21,918 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-02 11:47:21,918 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-02 11:47:21,919 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-02 11:47:21,928 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:47:21" (1/1) ... [2018-10-02 11:47:21,928 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:47:21" (1/1) ... [2018-10-02 11:47:21,929 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:47:21" (1/1) ... [2018-10-02 11:47:21,929 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:47:21" (1/1) ... [2018-10-02 11:47:21,932 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:47:21" (1/1) ... [2018-10-02 11:47:21,934 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:47:21" (1/1) ... [2018-10-02 11:47:21,935 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:47:21" (1/1) ... [2018-10-02 11:47:21,937 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-02 11:47:21,937 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-02 11:47:21,937 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-02 11:47:21,938 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-02 11:47:21,939 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:47:21" (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 [2018-10-02 11:47:22,005 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-02 11:47:22,005 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-02 11:47:22,290 INFO L340 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-02 11:47:22,290 INFO L202 PluginConnector]: Adding new model nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.10 11:47:22 BoogieIcfgContainer [2018-10-02 11:47:22,291 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-02 11:47:22,292 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-02 11:47:22,292 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-02 11:47:22,297 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-02 11:47:22,299 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:47:21" (1/2) ... [2018-10-02 11:47:22,300 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@10a3321b and model type nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.10 11:47:22, skipping insertion in model container [2018-10-02 11:47:22,300 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.10 11:47:22" (2/2) ... [2018-10-02 11:47:22,302 INFO L112 eAbstractionObserver]: Analyzing ICFG nested1.i_4.bpl [2018-10-02 11:47:22,313 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-02 11:47:22,324 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-02 11:47:22,368 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-02 11:47:22,369 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-10-02 11:47:22,369 INFO L382 AbstractCegarLoop]: Hoare is true [2018-10-02 11:47:22,369 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-02 11:47:22,369 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-02 11:47:22,370 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-02 11:47:22,370 INFO L386 AbstractCegarLoop]: Difference is false [2018-10-02 11:47:22,370 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-02 11:47:22,370 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-02 11:47:22,383 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-10-02 11:47:22,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-10-02 11:47:22,389 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:47:22,390 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-10-02 11:47:22,391 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:47:22,397 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:47:22,398 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2018-10-02 11:47:22,400 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:47:22,401 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:47:22,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:22,447 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:47:22,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:22,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:47:22,570 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:47:22,573 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-02 11:47:22,573 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-02 11:47:22,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-02 11:47:22,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-02 11:47:22,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-02 11:47:22,592 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-10-02 11:47:22,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:47:22,675 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2018-10-02 11:47:22,676 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-02 11:47:22,677 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-10-02 11:47:22,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:47:22,687 INFO L225 Difference]: With dead ends: 17 [2018-10-02 11:47:22,687 INFO L226 Difference]: Without dead ends: 11 [2018-10-02 11:47:22,690 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 [2018-10-02 11:47:22,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-10-02 11:47:22,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 9. [2018-10-02 11:47:22,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-10-02 11:47:22,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2018-10-02 11:47:22,729 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 4 [2018-10-02 11:47:22,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:47:22,730 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2018-10-02 11:47:22,730 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-02 11:47:22,730 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2018-10-02 11:47:22,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-10-02 11:47:22,730 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:47:22,731 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2018-10-02 11:47:22,731 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:47:22,731 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:47:22,732 INFO L82 PathProgramCache]: Analyzing trace with hash 209100445, now seen corresponding path program 1 times [2018-10-02 11:47:22,732 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:47:22,732 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:47:22,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:22,733 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:47:22,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:22,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:47:22,833 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:47:22,834 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-02 11:47:22,834 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-02 11:47:22,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-02 11:47:22,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-02 11:47:22,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-02 11:47:22,838 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 3 states. [2018-10-02 11:47:22,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:47:22,901 INFO L93 Difference]: Finished difference Result 17 states and 20 transitions. [2018-10-02 11:47:22,902 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-02 11:47:22,902 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2018-10-02 11:47:22,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:47:22,903 INFO L225 Difference]: With dead ends: 17 [2018-10-02 11:47:22,903 INFO L226 Difference]: Without dead ends: 11 [2018-10-02 11:47:22,904 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-02 11:47:22,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-10-02 11:47:22,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-10-02 11:47:22,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-10-02 11:47:22,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2018-10-02 11:47:22,908 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2018-10-02 11:47:22,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:47:22,909 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2018-10-02 11:47:22,909 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-02 11:47:22,909 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2018-10-02 11:47:22,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-02 11:47:22,910 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:47:22,910 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2018-10-02 11:47:22,910 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:47:22,911 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:47:22,911 INFO L82 PathProgramCache]: Analyzing trace with hash -850198025, now seen corresponding path program 1 times [2018-10-02 11:47:22,911 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:47:22,911 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:47:22,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:22,912 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:47:22,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:22,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:47:23,011 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:47:23,011 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:47:23,012 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 [2018-10-02 11:47:23,021 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:47:23,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:47:23,052 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:47:23,181 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:47:23,202 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:47:23,202 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 7 [2018-10-02 11:47:23,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-02 11:47:23,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-02 11:47:23,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-10-02 11:47:23,204 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 7 states. [2018-10-02 11:47:23,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:47:23,666 INFO L93 Difference]: Finished difference Result 35 states and 43 transitions. [2018-10-02 11:47:23,666 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-02 11:47:23,667 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 10 [2018-10-02 11:47:23,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:47:23,668 INFO L225 Difference]: With dead ends: 35 [2018-10-02 11:47:23,668 INFO L226 Difference]: Without dead ends: 27 [2018-10-02 11:47:23,669 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2018-10-02 11:47:23,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-02 11:47:23,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 21. [2018-10-02 11:47:23,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-02 11:47:23,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2018-10-02 11:47:23,677 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 10 [2018-10-02 11:47:23,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:47:23,678 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2018-10-02 11:47:23,678 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-02 11:47:23,678 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2018-10-02 11:47:23,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-02 11:47:23,679 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:47:23,679 INFO L375 BasicCegarLoop]: trace histogram [6, 4, 3, 2, 2, 1, 1, 1] [2018-10-02 11:47:23,680 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:47:23,680 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:47:23,681 INFO L82 PathProgramCache]: Analyzing trace with hash 1881088987, now seen corresponding path program 2 times [2018-10-02 11:47:23,681 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:47:23,681 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:47:23,682 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:23,682 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:47:23,683 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:23,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:47:23,806 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-10-02 11:47:23,806 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:47:23,807 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) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 11:47:23,819 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 11:47:23,847 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 11:47:23,847 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:47:23,850 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:47:23,980 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-02 11:47:24,012 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:47:24,013 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 8 [2018-10-02 11:47:24,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-02 11:47:24,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-02 11:47:24,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-02 11:47:24,017 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 8 states. [2018-10-02 11:47:24,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:47:24,710 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2018-10-02 11:47:24,711 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-02 11:47:24,711 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2018-10-02 11:47:24,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:47:24,713 INFO L225 Difference]: With dead ends: 55 [2018-10-02 11:47:24,713 INFO L226 Difference]: Without dead ends: 43 [2018-10-02 11:47:24,714 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2018-10-02 11:47:24,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-02 11:47:24,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 35. [2018-10-02 11:47:24,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-02 11:47:24,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2018-10-02 11:47:24,732 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 20 [2018-10-02 11:47:24,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:47:24,732 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2018-10-02 11:47:24,732 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-02 11:47:24,733 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2018-10-02 11:47:24,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-02 11:47:24,734 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:47:24,734 INFO L375 BasicCegarLoop]: trace histogram [12, 9, 4, 3, 3, 1, 1, 1] [2018-10-02 11:47:24,734 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:47:24,736 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:47:24,736 INFO L82 PathProgramCache]: Analyzing trace with hash 501354739, now seen corresponding path program 3 times [2018-10-02 11:47:24,736 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:47:24,737 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:47:24,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:24,739 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:47:24,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:24,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:47:24,933 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 70 proven. 12 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2018-10-02 11:47:24,933 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:47:24,933 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 [2018-10-02 11:47:24,948 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 11:47:24,974 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-02 11:47:24,974 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:47:24,977 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:47:25,003 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 70 proven. 12 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2018-10-02 11:47:25,026 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:47:25,026 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-10-02 11:47:25,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-02 11:47:25,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-02 11:47:25,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-02 11:47:25,027 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand 6 states. [2018-10-02 11:47:25,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:47:25,094 INFO L93 Difference]: Finished difference Result 65 states and 73 transitions. [2018-10-02 11:47:25,094 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-02 11:47:25,095 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 34 [2018-10-02 11:47:25,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:47:25,096 INFO L225 Difference]: With dead ends: 65 [2018-10-02 11:47:25,096 INFO L226 Difference]: Without dead ends: 41 [2018-10-02 11:47:25,097 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-02 11:47:25,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-10-02 11:47:25,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-10-02 11:47:25,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-02 11:47:25,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-10-02 11:47:25,107 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 34 [2018-10-02 11:47:25,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:47:25,107 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-10-02 11:47:25,107 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-02 11:47:25,108 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-10-02 11:47:25,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-02 11:47:25,109 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:47:25,109 INFO L375 BasicCegarLoop]: trace histogram [15, 12, 4, 3, 3, 1, 1, 1] [2018-10-02 11:47:25,109 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:47:25,110 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:47:25,110 INFO L82 PathProgramCache]: Analyzing trace with hash 209827969, now seen corresponding path program 4 times [2018-10-02 11:47:25,110 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:47:25,110 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:47:25,111 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:25,111 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:47:25,111 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:25,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:47:25,318 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-02 11:47:25,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:47:25,319 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 [2018-10-02 11:47:25,326 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 11:47:25,346 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 11:47:25,346 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:47:25,349 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:47:25,483 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-02 11:47:25,513 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:47:25,513 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 9] total 9 [2018-10-02 11:47:25,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-02 11:47:25,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-02 11:47:25,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2018-10-02 11:47:25,514 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 10 states. [2018-10-02 11:47:25,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:47:25,800 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2018-10-02 11:47:25,801 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-02 11:47:25,802 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 40 [2018-10-02 11:47:25,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:47:25,803 INFO L225 Difference]: With dead ends: 65 [2018-10-02 11:47:25,803 INFO L226 Difference]: Without dead ends: 63 [2018-10-02 11:47:25,804 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2018-10-02 11:47:25,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-02 11:47:25,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 53. [2018-10-02 11:47:25,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-02 11:47:25,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2018-10-02 11:47:25,817 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 40 [2018-10-02 11:47:25,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:47:25,817 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2018-10-02 11:47:25,818 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-02 11:47:25,818 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2018-10-02 11:47:25,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-02 11:47:25,819 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:47:25,820 INFO L375 BasicCegarLoop]: trace histogram [20, 16, 5, 4, 4, 1, 1, 1] [2018-10-02 11:47:25,820 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:47:25,820 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:47:25,820 INFO L82 PathProgramCache]: Analyzing trace with hash -1874565441, now seen corresponding path program 5 times [2018-10-02 11:47:25,821 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:47:25,821 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:47:25,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:25,822 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:47:25,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:25,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:47:26,094 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 320 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2018-10-02 11:47:26,095 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:47:26,095 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 [2018-10-02 11:47:26,105 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 11:47:26,127 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-02 11:47:26,127 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:47:26,130 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:47:26,273 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 262 proven. 20 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2018-10-02 11:47:26,295 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:47:26,295 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2018-10-02 11:47:26,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-02 11:47:26,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-02 11:47:26,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-02 11:47:26,298 INFO L87 Difference]: Start difference. First operand 53 states and 57 transitions. Second operand 12 states. [2018-10-02 11:47:27,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:47:27,437 INFO L93 Difference]: Finished difference Result 127 states and 143 transitions. [2018-10-02 11:47:27,440 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-02 11:47:27,440 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 52 [2018-10-02 11:47:27,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:47:27,441 INFO L225 Difference]: With dead ends: 127 [2018-10-02 11:47:27,442 INFO L226 Difference]: Without dead ends: 87 [2018-10-02 11:47:27,443 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=121, Invalid=1211, Unknown=0, NotChecked=0, Total=1332 [2018-10-02 11:47:27,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-02 11:47:27,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 75. [2018-10-02 11:47:27,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-02 11:47:27,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 80 transitions. [2018-10-02 11:47:27,461 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 80 transitions. Word has length 52 [2018-10-02 11:47:27,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:47:27,462 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 80 transitions. [2018-10-02 11:47:27,462 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-02 11:47:27,462 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 80 transitions. [2018-10-02 11:47:27,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-02 11:47:27,464 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:47:27,465 INFO L375 BasicCegarLoop]: trace histogram [30, 25, 6, 5, 5, 1, 1, 1] [2018-10-02 11:47:27,465 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:47:27,465 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:47:27,465 INFO L82 PathProgramCache]: Analyzing trace with hash -1734028097, now seen corresponding path program 6 times [2018-10-02 11:47:27,466 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:47:27,466 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:47:27,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:27,467 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:47:27,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:27,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:47:28,017 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 750 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2018-10-02 11:47:28,018 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:47:28,018 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 [2018-10-02 11:47:28,031 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-02 11:47:28,126 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2018-10-02 11:47:28,126 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:47:28,130 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:47:28,372 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 520 proven. 30 refuted. 0 times theorem prover too weak. 350 trivial. 0 not checked. [2018-10-02 11:47:28,392 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:47:28,393 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2018-10-02 11:47:28,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-02 11:47:28,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-02 11:47:28,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-02 11:47:28,394 INFO L87 Difference]: Start difference. First operand 75 states and 80 transitions. Second operand 14 states. [2018-10-02 11:47:29,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:47:29,897 INFO L93 Difference]: Finished difference Result 175 states and 194 transitions. [2018-10-02 11:47:29,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-02 11:47:29,900 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 74 [2018-10-02 11:47:29,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:47:29,901 INFO L225 Difference]: With dead ends: 175 [2018-10-02 11:47:29,901 INFO L226 Difference]: Without dead ends: 115 [2018-10-02 11:47:29,903 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 630 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=169, Invalid=2281, Unknown=0, NotChecked=0, Total=2450 [2018-10-02 11:47:29,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-02 11:47:29,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 101. [2018-10-02 11:47:29,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-10-02 11:47:29,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 107 transitions. [2018-10-02 11:47:29,930 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 107 transitions. Word has length 74 [2018-10-02 11:47:29,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:47:29,930 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 107 transitions. [2018-10-02 11:47:29,930 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-02 11:47:29,931 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 107 transitions. [2018-10-02 11:47:29,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-10-02 11:47:29,934 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:47:29,934 INFO L375 BasicCegarLoop]: trace histogram [42, 36, 7, 6, 6, 1, 1, 1] [2018-10-02 11:47:29,934 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:47:29,936 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:47:29,936 INFO L82 PathProgramCache]: Analyzing trace with hash 883432563, now seen corresponding path program 7 times [2018-10-02 11:47:29,936 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:47:29,936 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:47:29,937 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:29,937 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:47:29,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:29,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:47:30,347 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1512 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2018-10-02 11:47:30,347 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:47:30,347 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 [2018-10-02 11:47:30,356 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:47:30,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:47:30,404 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:47:30,936 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1554 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-10-02 11:47:30,958 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:47:30,958 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 14] total 14 [2018-10-02 11:47:30,958 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-02 11:47:30,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-02 11:47:30,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2018-10-02 11:47:30,959 INFO L87 Difference]: Start difference. First operand 101 states and 107 transitions. Second operand 15 states. [2018-10-02 11:47:31,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:47:31,286 INFO L93 Difference]: Finished difference Result 133 states and 141 transitions. [2018-10-02 11:47:31,286 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-02 11:47:31,286 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 100 [2018-10-02 11:47:31,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:47:31,288 INFO L225 Difference]: With dead ends: 133 [2018-10-02 11:47:31,288 INFO L226 Difference]: Without dead ends: 131 [2018-10-02 11:47:31,289 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2018-10-02 11:47:31,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2018-10-02 11:47:31,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 117. [2018-10-02 11:47:31,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-02 11:47:31,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 124 transitions. [2018-10-02 11:47:31,314 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 124 transitions. Word has length 100 [2018-10-02 11:47:31,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:47:31,314 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 124 transitions. [2018-10-02 11:47:31,314 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-02 11:47:31,314 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 124 transitions. [2018-10-02 11:47:31,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-02 11:47:31,316 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:47:31,316 INFO L375 BasicCegarLoop]: trace histogram [49, 42, 8, 7, 7, 1, 1, 1] [2018-10-02 11:47:31,317 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:47:31,317 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:47:31,317 INFO L82 PathProgramCache]: Analyzing trace with hash -1346298395, now seen corresponding path program 8 times [2018-10-02 11:47:31,317 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:47:31,317 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:47:31,318 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:31,318 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:47:31,318 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:31,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:47:31,522 INFO L134 CoverageAnalysis]: Checked inductivity of 2408 backedges. 0 proven. 2114 refuted. 0 times theorem prover too weak. 294 trivial. 0 not checked. [2018-10-02 11:47:31,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:47:31,523 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 [2018-10-02 11:47:31,536 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 11:47:31,578 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 11:47:31,579 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:47:31,583 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:47:31,686 INFO L134 CoverageAnalysis]: Checked inductivity of 2408 backedges. 0 proven. 2114 refuted. 0 times theorem prover too weak. 294 trivial. 0 not checked. [2018-10-02 11:47:31,707 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:47:31,708 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-02 11:47:31,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-02 11:47:31,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-02 11:47:31,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-02 11:47:31,709 INFO L87 Difference]: Start difference. First operand 117 states and 124 transitions. Second operand 10 states. [2018-10-02 11:47:32,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:47:32,136 INFO L93 Difference]: Finished difference Result 149 states and 158 transitions. [2018-10-02 11:47:32,138 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-02 11:47:32,138 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 116 [2018-10-02 11:47:32,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:47:32,139 INFO L225 Difference]: With dead ends: 149 [2018-10-02 11:47:32,140 INFO L226 Difference]: Without dead ends: 147 [2018-10-02 11:47:32,140 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 115 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-02 11:47:32,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-10-02 11:47:32,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 133. [2018-10-02 11:47:32,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-10-02 11:47:32,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 141 transitions. [2018-10-02 11:47:32,170 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 141 transitions. Word has length 116 [2018-10-02 11:47:32,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:47:32,170 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 141 transitions. [2018-10-02 11:47:32,171 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-02 11:47:32,171 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 141 transitions. [2018-10-02 11:47:32,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-10-02 11:47:32,173 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:47:32,173 INFO L375 BasicCegarLoop]: trace histogram [56, 48, 9, 8, 8, 1, 1, 1] [2018-10-02 11:47:32,173 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:47:32,174 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:47:32,174 INFO L82 PathProgramCache]: Analyzing trace with hash 1851587415, now seen corresponding path program 9 times [2018-10-02 11:47:32,174 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:47:32,174 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:47:32,175 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:32,175 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:47:32,175 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:32,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:47:32,474 INFO L134 CoverageAnalysis]: Checked inductivity of 3152 backedges. 0 proven. 2816 refuted. 0 times theorem prover too weak. 336 trivial. 0 not checked. [2018-10-02 11:47:32,474 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:47:32,475 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 [2018-10-02 11:47:32,482 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 11:47:32,545 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-02 11:47:32,545 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:47:32,550 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:47:32,797 INFO L134 CoverageAnalysis]: Checked inductivity of 3152 backedges. 702 proven. 42 refuted. 0 times theorem prover too weak. 2408 trivial. 0 not checked. [2018-10-02 11:47:32,818 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:47:32,818 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 18 [2018-10-02 11:47:32,819 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-02 11:47:32,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-02 11:47:32,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-02 11:47:32,819 INFO L87 Difference]: Start difference. First operand 133 states and 141 transitions. Second operand 18 states. [2018-10-02 11:47:35,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:47:35,673 INFO L93 Difference]: Finished difference Result 299 states and 327 transitions. [2018-10-02 11:47:35,674 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-10-02 11:47:35,674 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 132 [2018-10-02 11:47:35,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:47:35,675 INFO L225 Difference]: With dead ends: 299 [2018-10-02 11:47:35,675 INFO L226 Difference]: Without dead ends: 183 [2018-10-02 11:47:35,679 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1953 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=285, Invalid=6195, Unknown=0, NotChecked=0, Total=6480 [2018-10-02 11:47:35,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2018-10-02 11:47:35,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 167. [2018-10-02 11:47:35,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-02 11:47:35,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 176 transitions. [2018-10-02 11:47:35,704 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 176 transitions. Word has length 132 [2018-10-02 11:47:35,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:47:35,705 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 176 transitions. [2018-10-02 11:47:35,705 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-02 11:47:35,705 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 176 transitions. [2018-10-02 11:47:35,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2018-10-02 11:47:35,710 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:47:35,710 INFO L375 BasicCegarLoop]: trace histogram [72, 63, 10, 9, 9, 1, 1, 1] [2018-10-02 11:47:35,710 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:47:35,710 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:47:35,710 INFO L82 PathProgramCache]: Analyzing trace with hash -132347917, now seen corresponding path program 10 times [2018-10-02 11:47:35,711 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:47:35,711 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:47:35,711 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:35,711 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:47:35,712 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:35,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:47:36,050 INFO L134 CoverageAnalysis]: Checked inductivity of 5202 backedges. 0 proven. 4698 refuted. 0 times theorem prover too weak. 504 trivial. 0 not checked. [2018-10-02 11:47:36,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:47:36,050 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 [2018-10-02 11:47:36,059 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 11:47:36,128 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 11:47:36,129 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:47:36,133 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:47:36,274 INFO L134 CoverageAnalysis]: Checked inductivity of 5202 backedges. 1952 proven. 56 refuted. 0 times theorem prover too weak. 3194 trivial. 0 not checked. [2018-10-02 11:47:36,295 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:47:36,295 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 20 [2018-10-02 11:47:36,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-02 11:47:36,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-02 11:47:36,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-02 11:47:36,296 INFO L87 Difference]: Start difference. First operand 167 states and 176 transitions. Second operand 20 states. [2018-10-02 11:47:38,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:47:38,662 INFO L93 Difference]: Finished difference Result 371 states and 402 transitions. [2018-10-02 11:47:38,663 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2018-10-02 11:47:38,663 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 166 [2018-10-02 11:47:38,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:47:38,664 INFO L225 Difference]: With dead ends: 371 [2018-10-02 11:47:38,664 INFO L226 Difference]: Without dead ends: 223 [2018-10-02 11:47:38,668 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3160 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=357, Invalid=9543, Unknown=0, NotChecked=0, Total=9900 [2018-10-02 11:47:38,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-10-02 11:47:38,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 205. [2018-10-02 11:47:38,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-10-02 11:47:38,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 215 transitions. [2018-10-02 11:47:38,696 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 215 transitions. Word has length 166 [2018-10-02 11:47:38,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:47:38,697 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 215 transitions. [2018-10-02 11:47:38,697 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-02 11:47:38,697 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 215 transitions. [2018-10-02 11:47:38,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-10-02 11:47:38,699 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:47:38,699 INFO L375 BasicCegarLoop]: trace histogram [90, 80, 11, 10, 10, 1, 1, 1] [2018-10-02 11:47:38,699 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:47:38,700 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:47:38,700 INFO L82 PathProgramCache]: Analyzing trace with hash -1568317117, now seen corresponding path program 11 times [2018-10-02 11:47:38,700 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:47:38,700 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:47:38,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:38,701 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:47:38,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:38,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:47:39,114 INFO L134 CoverageAnalysis]: Checked inductivity of 8120 backedges. 0 proven. 7400 refuted. 0 times theorem prover too weak. 720 trivial. 0 not checked. [2018-10-02 11:47:39,114 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:47:39,114 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 [2018-10-02 11:47:39,122 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 11:47:39,335 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2018-10-02 11:47:39,335 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:47:39,339 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:47:39,792 INFO L134 CoverageAnalysis]: Checked inductivity of 8120 backedges. 3774 proven. 72 refuted. 0 times theorem prover too weak. 4274 trivial. 0 not checked. [2018-10-02 11:47:39,812 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:47:39,813 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 22 [2018-10-02 11:47:39,813 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-02 11:47:39,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-02 11:47:39,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-10-02 11:47:39,814 INFO L87 Difference]: Start difference. First operand 205 states and 215 transitions. Second operand 22 states. [2018-10-02 11:47:43,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:47:43,221 INFO L93 Difference]: Finished difference Result 451 states and 485 transitions. [2018-10-02 11:47:43,222 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2018-10-02 11:47:43,222 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 204 [2018-10-02 11:47:43,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:47:43,224 INFO L225 Difference]: With dead ends: 451 [2018-10-02 11:47:43,224 INFO L226 Difference]: Without dead ends: 267 [2018-10-02 11:47:43,229 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4851 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=437, Invalid=14083, Unknown=0, NotChecked=0, Total=14520 [2018-10-02 11:47:43,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2018-10-02 11:47:43,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 247. [2018-10-02 11:47:43,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2018-10-02 11:47:43,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 258 transitions. [2018-10-02 11:47:43,260 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 258 transitions. Word has length 204 [2018-10-02 11:47:43,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:47:43,261 INFO L480 AbstractCegarLoop]: Abstraction has 247 states and 258 transitions. [2018-10-02 11:47:43,261 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-02 11:47:43,261 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 258 transitions. [2018-10-02 11:47:43,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2018-10-02 11:47:43,264 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:47:43,264 INFO L375 BasicCegarLoop]: trace histogram [110, 99, 12, 11, 11, 1, 1, 1] [2018-10-02 11:47:43,264 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:47:43,264 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:47:43,265 INFO L82 PathProgramCache]: Analyzing trace with hash 915329223, now seen corresponding path program 12 times [2018-10-02 11:47:43,265 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:47:43,265 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:47:43,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:43,266 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:47:43,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:43,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:47:43,651 INFO L134 CoverageAnalysis]: Checked inductivity of 12122 backedges. 0 proven. 11132 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2018-10-02 11:47:43,651 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:47:43,652 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) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 11:47:43,660 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-02 11:47:48,484 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 21 check-sat command(s) [2018-10-02 11:47:48,484 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:47:48,500 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:47:48,728 INFO L134 CoverageAnalysis]: Checked inductivity of 12122 backedges. 2022 proven. 90 refuted. 0 times theorem prover too weak. 10010 trivial. 0 not checked. [2018-10-02 11:47:48,749 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:47:48,749 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 24 [2018-10-02 11:47:48,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-02 11:47:48,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-02 11:47:48,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-10-02 11:47:48,751 INFO L87 Difference]: Start difference. First operand 247 states and 258 transitions. Second operand 24 states. [2018-10-02 11:47:53,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:47:53,123 INFO L93 Difference]: Finished difference Result 539 states and 576 transitions. [2018-10-02 11:47:53,124 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2018-10-02 11:47:53,124 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 246 [2018-10-02 11:47:53,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:47:53,125 INFO L225 Difference]: With dead ends: 539 [2018-10-02 11:47:53,125 INFO L226 Difference]: Without dead ends: 315 [2018-10-02 11:47:53,131 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 236 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7140 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=525, Invalid=20067, Unknown=0, NotChecked=0, Total=20592 [2018-10-02 11:47:53,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2018-10-02 11:47:53,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 293. [2018-10-02 11:47:53,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 293 states. [2018-10-02 11:47:53,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 305 transitions. [2018-10-02 11:47:53,168 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 305 transitions. Word has length 246 [2018-10-02 11:47:53,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:47:53,168 INFO L480 AbstractCegarLoop]: Abstraction has 293 states and 305 transitions. [2018-10-02 11:47:53,168 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-02 11:47:53,168 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 305 transitions. [2018-10-02 11:47:53,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2018-10-02 11:47:53,172 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:47:53,173 INFO L375 BasicCegarLoop]: trace histogram [132, 120, 13, 12, 12, 1, 1, 1] [2018-10-02 11:47:53,173 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:47:53,173 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:47:53,173 INFO L82 PathProgramCache]: Analyzing trace with hash 154612223, now seen corresponding path program 13 times [2018-10-02 11:47:53,173 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:47:53,173 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:47:53,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:53,174 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:47:53,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:53,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:47:54,473 INFO L134 CoverageAnalysis]: Checked inductivity of 17448 backedges. 0 proven. 16128 refuted. 0 times theorem prover too weak. 1320 trivial. 0 not checked. [2018-10-02 11:47:54,473 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:47:54,473 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 [2018-10-02 11:47:54,481 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:47:54,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:47:54,585 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:47:54,765 INFO L134 CoverageAnalysis]: Checked inductivity of 17448 backedges. 0 proven. 16128 refuted. 0 times theorem prover too weak. 1320 trivial. 0 not checked. [2018-10-02 11:47:54,796 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:47:54,796 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-10-02 11:47:54,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-02 11:47:54,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-02 11:47:54,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-02 11:47:54,798 INFO L87 Difference]: Start difference. First operand 293 states and 305 transitions. Second operand 15 states. [2018-10-02 11:47:55,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:47:55,254 INFO L93 Difference]: Finished difference Result 341 states and 355 transitions. [2018-10-02 11:47:55,255 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-02 11:47:55,255 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 292 [2018-10-02 11:47:55,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:47:55,257 INFO L225 Difference]: With dead ends: 341 [2018-10-02 11:47:55,257 INFO L226 Difference]: Without dead ends: 339 [2018-10-02 11:47:55,257 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 291 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-02 11:47:55,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2018-10-02 11:47:55,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 317. [2018-10-02 11:47:55,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 317 states. [2018-10-02 11:47:55,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 330 transitions. [2018-10-02 11:47:55,300 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 330 transitions. Word has length 292 [2018-10-02 11:47:55,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:47:55,301 INFO L480 AbstractCegarLoop]: Abstraction has 317 states and 330 transitions. [2018-10-02 11:47:55,301 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-02 11:47:55,301 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 330 transitions. [2018-10-02 11:47:55,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2018-10-02 11:47:55,303 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:47:55,303 INFO L375 BasicCegarLoop]: trace histogram [143, 130, 14, 13, 13, 1, 1, 1] [2018-10-02 11:47:55,303 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:47:55,303 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:47:55,303 INFO L82 PathProgramCache]: Analyzing trace with hash -114885159, now seen corresponding path program 14 times [2018-10-02 11:47:55,304 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:47:55,304 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:47:55,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:55,305 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:47:55,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:55,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:47:55,975 INFO L134 CoverageAnalysis]: Checked inductivity of 20488 backedges. 0 proven. 19058 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2018-10-02 11:47:55,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:47:55,976 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 [2018-10-02 11:47:55,987 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 11:47:56,094 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 11:47:56,094 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:47:56,100 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:47:56,297 INFO L134 CoverageAnalysis]: Checked inductivity of 20488 backedges. 0 proven. 19058 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2018-10-02 11:47:56,318 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:47:56,318 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-02 11:47:56,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-02 11:47:56,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-02 11:47:56,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-02 11:47:56,319 INFO L87 Difference]: Start difference. First operand 317 states and 330 transitions. Second operand 16 states. [2018-10-02 11:47:56,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:47:56,665 INFO L93 Difference]: Finished difference Result 365 states and 380 transitions. [2018-10-02 11:47:56,665 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-02 11:47:56,665 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 316 [2018-10-02 11:47:56,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:47:56,668 INFO L225 Difference]: With dead ends: 365 [2018-10-02 11:47:56,668 INFO L226 Difference]: Without dead ends: 363 [2018-10-02 11:47:56,669 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 315 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-02 11:47:56,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 363 states. [2018-10-02 11:47:56,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 363 to 341. [2018-10-02 11:47:56,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 341 states. [2018-10-02 11:47:56,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 355 transitions. [2018-10-02 11:47:56,730 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 355 transitions. Word has length 316 [2018-10-02 11:47:56,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:47:56,731 INFO L480 AbstractCegarLoop]: Abstraction has 341 states and 355 transitions. [2018-10-02 11:47:56,731 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-02 11:47:56,732 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 355 transitions. [2018-10-02 11:47:56,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 341 [2018-10-02 11:47:56,734 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:47:56,735 INFO L375 BasicCegarLoop]: trace histogram [154, 140, 15, 14, 14, 1, 1, 1] [2018-10-02 11:47:56,735 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:47:56,735 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:47:56,735 INFO L82 PathProgramCache]: Analyzing trace with hash -1438164045, now seen corresponding path program 15 times [2018-10-02 11:47:56,736 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:47:56,736 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:47:56,736 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:56,737 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:47:56,737 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:47:56,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:47:57,313 INFO L134 CoverageAnalysis]: Checked inductivity of 23772 backedges. 0 proven. 22232 refuted. 0 times theorem prover too weak. 1540 trivial. 0 not checked. [2018-10-02 11:47:57,313 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:47:57,313 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 [2018-10-02 11:47:57,321 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown