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/toy/nonlinear/Mult1-Safe.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-c372c2b [2018-10-02 11:57:49,205 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-02 11:57:49,208 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-02 11:57:49,226 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-02 11:57:49,226 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-02 11:57:49,227 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-02 11:57:49,229 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-02 11:57:49,232 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-02 11:57:49,234 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-02 11:57:49,240 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-02 11:57:49,241 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-02 11:57:49,241 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-02 11:57:49,243 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-02 11:57:49,246 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-02 11:57:49,249 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-02 11:57:49,250 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-02 11:57:49,250 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-02 11:57:49,254 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-02 11:57:49,256 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-02 11:57:49,261 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-02 11:57:49,262 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-02 11:57:49,266 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-02 11:57:49,269 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-02 11:57:49,278 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 11:57:49,299 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-02 11:57:49,299 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-02 11:57:49,300 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-02 11:57:49,300 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-02 11:57:49,301 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-02 11:57:49,301 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-02 11:57:49,301 INFO L133 SettingsManager]: * Use SBE=true [2018-10-02 11:57:49,302 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-02 11:57:49,302 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-02 11:57:49,302 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-02 11:57:49,302 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-02 11:57:49,303 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-02 11:57:49,304 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-02 11:57:49,304 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-02 11:57:49,304 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-02 11:57:49,304 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-02 11:57:49,304 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-02 11:57:49,305 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-02 11:57:49,305 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-02 11:57:49,305 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-02 11:57:49,305 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-02 11:57:49,307 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-02 11:57:49,307 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-02 11:57:49,307 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-02 11:57:49,307 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-02 11:57:49,307 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-02 11:57:49,308 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-02 11:57:49,308 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-02 11:57:49,308 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-02 11:57:49,308 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-02 11:57:49,382 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-02 11:57:49,397 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-02 11:57:49,400 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-02 11:57:49,402 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-10-02 11:57:49,403 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-10-02 11:57:49,403 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/nonlinear/Mult1-Safe.bpl [2018-10-02 11:57:49,404 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/nonlinear/Mult1-Safe.bpl' [2018-10-02 11:57:49,450 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-02 11:57:49,454 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-10-02 11:57:49,455 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-02 11:57:49,455 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-02 11:57:49,455 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-02 11:57:49,476 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:57:49" (1/1) ... [2018-10-02 11:57:49,489 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:57:49" (1/1) ... [2018-10-02 11:57:49,493 WARN L165 Inliner]: Program contained no entry procedure! [2018-10-02 11:57:49,494 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2018-10-02 11:57:49,494 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2018-10-02 11:57:49,496 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-02 11:57:49,497 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-02 11:57:49,497 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-02 11:57:49,497 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-02 11:57:49,509 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:57:49" (1/1) ... [2018-10-02 11:57:49,509 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:57:49" (1/1) ... [2018-10-02 11:57:49,510 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:57:49" (1/1) ... [2018-10-02 11:57:49,510 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:57:49" (1/1) ... [2018-10-02 11:57:49,512 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:57:49" (1/1) ... [2018-10-02 11:57:49,517 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:57:49" (1/1) ... [2018-10-02 11:57:49,520 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:57:49" (1/1) ... [2018-10-02 11:57:49,521 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-02 11:57:49,522 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-02 11:57:49,522 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-02 11:57:49,522 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-02 11:57:49,523 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:57:49" (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 11:57:49,601 INFO L124 BoogieDeclarations]: Specification and implementation of procedure mult given in one single declaration [2018-10-02 11:57:49,602 INFO L130 BoogieDeclarations]: Found specification of procedure mult [2018-10-02 11:57:49,602 INFO L138 BoogieDeclarations]: Found implementation of procedure mult [2018-10-02 11:57:49,674 WARN L617 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2018-10-02 11:57:49,827 INFO L337 CfgBuilder]: Using library mode [2018-10-02 11:57:49,828 INFO L202 PluginConnector]: Adding new model Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.10 11:57:49 BoogieIcfgContainer [2018-10-02 11:57:49,828 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-02 11:57:49,829 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-02 11:57:49,829 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-02 11:57:49,836 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-02 11:57:49,836 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:57:49" (1/2) ... [2018-10-02 11:57:49,837 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74466dd6 and model type Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.10 11:57:49, skipping insertion in model container [2018-10-02 11:57:49,838 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.10 11:57:49" (2/2) ... [2018-10-02 11:57:49,840 INFO L112 eAbstractionObserver]: Analyzing ICFG Mult1-Safe.bpl [2018-10-02 11:57:49,850 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-02 11:57:49,859 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-02 11:57:49,906 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-02 11:57:49,907 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-10-02 11:57:49,907 INFO L382 AbstractCegarLoop]: Hoare is true [2018-10-02 11:57:49,907 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-02 11:57:49,908 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-02 11:57:49,908 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-02 11:57:49,909 INFO L386 AbstractCegarLoop]: Difference is false [2018-10-02 11:57:49,909 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-02 11:57:49,909 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-02 11:57:49,923 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-10-02 11:57:49,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-10-02 11:57:49,930 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:57:49,931 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-10-02 11:57:49,932 INFO L423 AbstractCegarLoop]: === Iteration 1 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:57:49,938 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:57:49,939 INFO L82 PathProgramCache]: Analyzing trace with hash 924708, now seen corresponding path program 1 times [2018-10-02 11:57:49,941 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:57:49,942 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:57:49,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:49,988 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:57:49,988 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:50,022 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:57:50,022 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:57:50,022 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:57:50,038 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:57:50,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:57:50,060 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:57:50,215 WARN L178 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-10-02 11:57:50,313 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 11:57:50,335 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-02 11:57:50,336 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-02 11:57:50,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-02 11:57:50,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-02 11:57:50,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-10-02 11:57:50,356 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 5 states. [2018-10-02 11:57:50,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:57:50,493 INFO L93 Difference]: Finished difference Result 10 states and 10 transitions. [2018-10-02 11:57:50,494 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-02 11:57:50,495 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 4 [2018-10-02 11:57:50,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:57:50,508 INFO L225 Difference]: With dead ends: 10 [2018-10-02 11:57:50,509 INFO L226 Difference]: Without dead ends: 6 [2018-10-02 11:57:50,512 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2018-10-02 11:57:50,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2018-10-02 11:57:50,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2018-10-02 11:57:50,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2018-10-02 11:57:50,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2018-10-02 11:57:50,546 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2018-10-02 11:57:50,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:57:50,546 INFO L480 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2018-10-02 11:57:50,546 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-02 11:57:50,547 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2018-10-02 11:57:50,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-10-02 11:57:50,547 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:57:50,547 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2018-10-02 11:57:50,548 INFO L423 AbstractCegarLoop]: === Iteration 2 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:57:50,548 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:57:50,548 INFO L82 PathProgramCache]: Analyzing trace with hash 28663973, now seen corresponding path program 1 times [2018-10-02 11:57:50,548 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:57:50,549 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:57:50,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:50,550 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:57:50,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:50,555 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:57:50,555 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:57:50,555 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 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:57:50,564 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:57:50,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:57:50,572 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:57:50,661 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:50,682 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:57:50,682 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2018-10-02 11:57:50,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-02 11:57:50,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-02 11:57:50,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-02 11:57:50,685 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand 5 states. [2018-10-02 11:57:50,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:57:50,850 INFO L93 Difference]: Finished difference Result 9 states and 9 transitions. [2018-10-02 11:57:50,851 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-02 11:57:50,852 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 5 [2018-10-02 11:57:50,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:57:50,852 INFO L225 Difference]: With dead ends: 9 [2018-10-02 11:57:50,853 INFO L226 Difference]: Without dead ends: 7 [2018-10-02 11:57:50,854 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-02 11:57:50,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-10-02 11:57:50,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-10-02 11:57:50,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-10-02 11:57:50,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-10-02 11:57:50,858 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 5 [2018-10-02 11:57:50,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:57:50,859 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-10-02 11:57:50,859 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-02 11:57:50,859 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-10-02 11:57:50,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-02 11:57:50,859 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:57:50,860 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-10-02 11:57:50,860 INFO L423 AbstractCegarLoop]: === Iteration 3 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:57:50,860 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:57:50,861 INFO L82 PathProgramCache]: Analyzing trace with hash 888581188, now seen corresponding path program 2 times [2018-10-02 11:57:50,861 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:57:50,861 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:57:50,862 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:50,862 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:57:50,862 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:50,871 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:57:50,871 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:57:50,872 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 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:57:50,892 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 11:57:50,907 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 11:57:50,907 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:57:50,909 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:57:51,236 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:51,259 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:57:51,259 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2018-10-02 11:57:51,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-02 11:57:51,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-02 11:57:51,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-02 11:57:51,261 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 6 states. [2018-10-02 11:57:51,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:57:51,350 INFO L93 Difference]: Finished difference Result 10 states and 10 transitions. [2018-10-02 11:57:51,351 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-02 11:57:51,351 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2018-10-02 11:57:51,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:57:51,352 INFO L225 Difference]: With dead ends: 10 [2018-10-02 11:57:51,352 INFO L226 Difference]: Without dead ends: 8 [2018-10-02 11:57:51,353 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-10-02 11:57:51,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-10-02 11:57:51,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-10-02 11:57:51,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-10-02 11:57:51,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-10-02 11:57:51,356 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2018-10-02 11:57:51,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:57:51,358 INFO L480 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-10-02 11:57:51,358 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-02 11:57:51,358 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-10-02 11:57:51,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-10-02 11:57:51,359 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:57:51,359 INFO L375 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1] [2018-10-02 11:57:51,360 INFO L423 AbstractCegarLoop]: === Iteration 4 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:57:51,360 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:57:51,360 INFO L82 PathProgramCache]: Analyzing trace with hash 1776211077, now seen corresponding path program 3 times [2018-10-02 11:57:51,360 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:57:51,361 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:57:51,362 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:51,362 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:57:51,362 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:51,369 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:57:51,370 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:57:51,370 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 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:57:51,378 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 11:57:51,390 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-02 11:57:51,390 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:57:51,392 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:57:51,597 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:51,622 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:57:51,623 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2018-10-02 11:57:51,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-02 11:57:51,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-02 11:57:51,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-02 11:57:51,624 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 7 states. [2018-10-02 11:57:51,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:57:51,714 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-10-02 11:57:51,715 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-02 11:57:51,715 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2018-10-02 11:57:51,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:57:51,715 INFO L225 Difference]: With dead ends: 11 [2018-10-02 11:57:51,716 INFO L226 Difference]: Without dead ends: 9 [2018-10-02 11:57:51,716 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2018-10-02 11:57:51,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-10-02 11:57:51,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-10-02 11:57:51,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-10-02 11:57:51,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-10-02 11:57:51,721 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2018-10-02 11:57:51,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:57:51,721 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-10-02 11:57:51,721 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-02 11:57:51,722 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-10-02 11:57:51,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-10-02 11:57:51,722 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:57:51,722 INFO L375 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2018-10-02 11:57:51,723 INFO L423 AbstractCegarLoop]: === Iteration 5 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:57:51,723 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:57:51,723 INFO L82 PathProgramCache]: Analyzing trace with hash -772033436, now seen corresponding path program 4 times [2018-10-02 11:57:51,723 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:57:51,723 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:57:51,724 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:51,724 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:57:51,724 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:51,731 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:57:51,732 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:57:51,732 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 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:57:51,744 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 11:57:51,756 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 11:57:51,756 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:57:51,758 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:57:52,157 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:52,178 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:57:52,178 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2018-10-02 11:57:52,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-02 11:57:52,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-02 11:57:52,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-02 11:57:52,179 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 8 states. [2018-10-02 11:57:52,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:57:52,309 INFO L93 Difference]: Finished difference Result 12 states and 12 transitions. [2018-10-02 11:57:52,309 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-02 11:57:52,310 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 8 [2018-10-02 11:57:52,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:57:52,311 INFO L225 Difference]: With dead ends: 12 [2018-10-02 11:57:52,311 INFO L226 Difference]: Without dead ends: 10 [2018-10-02 11:57:52,311 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2018-10-02 11:57:52,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-10-02 11:57:52,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-10-02 11:57:52,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-10-02 11:57:52,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-10-02 11:57:52,315 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 8 [2018-10-02 11:57:52,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:57:52,315 INFO L480 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2018-10-02 11:57:52,316 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-02 11:57:52,316 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2018-10-02 11:57:52,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-10-02 11:57:52,316 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:57:52,316 INFO L375 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1] [2018-10-02 11:57:52,317 INFO L423 AbstractCegarLoop]: === Iteration 6 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:57:52,317 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:57:52,317 INFO L82 PathProgramCache]: Analyzing trace with hash 1836765285, now seen corresponding path program 5 times [2018-10-02 11:57:52,317 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:57:52,317 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:57:52,318 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:52,318 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:57:52,319 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:52,327 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:57:52,328 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:57:52,328 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 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:57:52,337 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 11:57:52,349 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2018-10-02 11:57:52,349 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:57:52,351 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:57:52,484 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:52,505 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:57:52,505 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2018-10-02 11:57:52,505 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-02 11:57:52,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-02 11:57:52,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-02 11:57:52,506 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 9 states. [2018-10-02 11:57:52,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:57:52,635 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-10-02 11:57:52,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-02 11:57:52,637 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 9 [2018-10-02 11:57:52,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:57:52,638 INFO L225 Difference]: With dead ends: 13 [2018-10-02 11:57:52,638 INFO L226 Difference]: Without dead ends: 11 [2018-10-02 11:57:52,639 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2018-10-02 11:57:52,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-10-02 11:57:52,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-10-02 11:57:52,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-10-02 11:57:52,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-10-02 11:57:52,643 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2018-10-02 11:57:52,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:57:52,643 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-10-02 11:57:52,643 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-02 11:57:52,643 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-10-02 11:57:52,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-02 11:57:52,644 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:57:52,644 INFO L375 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1] [2018-10-02 11:57:52,644 INFO L423 AbstractCegarLoop]: === Iteration 7 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:57:52,644 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:57:52,645 INFO L82 PathProgramCache]: Analyzing trace with hash 1105147012, now seen corresponding path program 6 times [2018-10-02 11:57:52,645 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:57:52,645 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:57:52,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:52,646 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:57:52,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:52,653 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:57:52,654 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:57:52,654 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 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:57:52,664 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-02 11:57:52,679 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2018-10-02 11:57:52,679 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:57:52,681 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:57:52,863 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:52,884 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:57:52,884 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2018-10-02 11:57:52,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-02 11:57:52,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-02 11:57:52,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-02 11:57:52,885 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 10 states. [2018-10-02 11:57:53,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:57:53,068 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2018-10-02 11:57:53,069 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-02 11:57:53,069 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 10 [2018-10-02 11:57:53,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:57:53,070 INFO L225 Difference]: With dead ends: 14 [2018-10-02 11:57:53,070 INFO L226 Difference]: Without dead ends: 12 [2018-10-02 11:57:53,071 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2018-10-02 11:57:53,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-02 11:57:53,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-02 11:57:53,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-02 11:57:53,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-02 11:57:53,074 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-10-02 11:57:53,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:57:53,075 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-02 11:57:53,075 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-02 11:57:53,075 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-02 11:57:53,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-02 11:57:53,075 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:57:53,075 INFO L375 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1] [2018-10-02 11:57:53,076 INFO L423 AbstractCegarLoop]: === Iteration 8 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:57:53,076 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:57:53,076 INFO L82 PathProgramCache]: Analyzing trace with hash -100182971, now seen corresponding path program 7 times [2018-10-02 11:57:53,076 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:57:53,077 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:57:53,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:53,078 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:57:53,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:53,086 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:57:53,086 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:57:53,086 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 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:57:53,098 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:57:53,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:57:53,116 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:57:53,304 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:53,326 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:57:53,327 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2018-10-02 11:57:53,327 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-02 11:57:53,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-02 11:57:53,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-02 11:57:53,328 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 11 states. [2018-10-02 11:57:53,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:57:53,443 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-10-02 11:57:53,444 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-02 11:57:53,444 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 11 [2018-10-02 11:57:53,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:57:53,445 INFO L225 Difference]: With dead ends: 15 [2018-10-02 11:57:53,445 INFO L226 Difference]: Without dead ends: 13 [2018-10-02 11:57:53,446 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2018-10-02 11:57:53,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-02 11:57:53,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-02 11:57:53,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-02 11:57:53,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-10-02 11:57:53,451 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2018-10-02 11:57:53,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:57:53,451 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-10-02 11:57:53,451 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-02 11:57:53,451 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-10-02 11:57:53,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-02 11:57:53,452 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:57:53,452 INFO L375 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1] [2018-10-02 11:57:53,452 INFO L423 AbstractCegarLoop]: === Iteration 9 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:57:53,453 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:57:53,453 INFO L82 PathProgramCache]: Analyzing trace with hash 1189293220, now seen corresponding path program 8 times [2018-10-02 11:57:53,453 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:57:53,453 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:57:53,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:53,454 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:57:53,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:53,465 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:57:53,465 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:57:53,465 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 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:57:53,474 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 11:57:53,495 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 11:57:53,496 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:57:53,498 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:57:53,653 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:53,673 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:57:53,674 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2018-10-02 11:57:53,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-02 11:57:53,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-02 11:57:53,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-02 11:57:53,675 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 12 states. [2018-10-02 11:57:53,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:57:53,844 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-10-02 11:57:53,844 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-02 11:57:53,844 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 12 [2018-10-02 11:57:53,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:57:53,845 INFO L225 Difference]: With dead ends: 16 [2018-10-02 11:57:53,846 INFO L226 Difference]: Without dead ends: 14 [2018-10-02 11:57:53,847 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2018-10-02 11:57:53,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-02 11:57:53,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-02 11:57:53,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-02 11:57:53,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-02 11:57:53,851 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2018-10-02 11:57:53,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:57:53,851 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-02 11:57:53,851 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-02 11:57:53,851 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-02 11:57:53,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-02 11:57:53,852 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:57:53,852 INFO L375 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1] [2018-10-02 11:57:53,852 INFO L423 AbstractCegarLoop]: === Iteration 10 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:57:53,852 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:57:53,852 INFO L82 PathProgramCache]: Analyzing trace with hash -1786617819, now seen corresponding path program 9 times [2018-10-02 11:57:53,852 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:57:53,853 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:57:53,853 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:53,853 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:57:53,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:53,863 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:57:53,863 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:57:53,863 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 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:57:53,877 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 11:57:53,902 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-02 11:57:53,902 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:57:53,904 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:57:54,198 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:54,227 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:57:54,228 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2018-10-02 11:57:54,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-02 11:57:54,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-02 11:57:54,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-02 11:57:54,229 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 13 states. [2018-10-02 11:57:54,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:57:54,404 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-10-02 11:57:54,405 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-02 11:57:54,405 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 13 [2018-10-02 11:57:54,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:57:54,406 INFO L225 Difference]: With dead ends: 17 [2018-10-02 11:57:54,406 INFO L226 Difference]: Without dead ends: 15 [2018-10-02 11:57:54,407 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2018-10-02 11:57:54,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-02 11:57:54,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-02 11:57:54,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-02 11:57:54,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-02 11:57:54,412 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2018-10-02 11:57:54,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:57:54,412 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-02 11:57:54,413 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-02 11:57:54,413 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-02 11:57:54,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-02 11:57:54,413 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:57:54,413 INFO L375 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1] [2018-10-02 11:57:54,414 INFO L423 AbstractCegarLoop]: === Iteration 11 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:57:54,414 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:57:54,414 INFO L82 PathProgramCache]: Analyzing trace with hash 449420484, now seen corresponding path program 10 times [2018-10-02 11:57:54,414 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:57:54,414 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:57:54,415 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:54,415 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:57:54,415 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:54,426 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:57:54,426 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:57:54,427 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 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:57:54,443 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 11:57:54,471 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 11:57:54,471 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:57:54,473 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:57:54,830 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:54,854 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:57:54,854 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2018-10-02 11:57:54,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-02 11:57:54,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-02 11:57:54,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-02 11:57:54,855 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 14 states. [2018-10-02 11:57:55,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:57:55,202 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2018-10-02 11:57:55,203 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-02 11:57:55,203 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 14 [2018-10-02 11:57:55,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:57:55,204 INFO L225 Difference]: With dead ends: 18 [2018-10-02 11:57:55,204 INFO L226 Difference]: Without dead ends: 16 [2018-10-02 11:57:55,205 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2018-10-02 11:57:55,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-02 11:57:55,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-02 11:57:55,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-02 11:57:55,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-02 11:57:55,210 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2018-10-02 11:57:55,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:57:55,210 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-02 11:57:55,210 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-02 11:57:55,211 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-02 11:57:55,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-02 11:57:55,211 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:57:55,211 INFO L375 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1] [2018-10-02 11:57:55,211 INFO L423 AbstractCegarLoop]: === Iteration 12 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:57:55,212 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:57:55,212 INFO L82 PathProgramCache]: Analyzing trace with hash 1047131141, now seen corresponding path program 11 times [2018-10-02 11:57:55,212 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:57:55,212 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:57:55,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:55,213 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:57:55,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:55,224 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:57:55,224 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:57:55,224 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 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:57:55,235 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 11:57:55,268 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-10-02 11:57:55,268 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:57:55,271 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:57:55,616 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:55,657 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:57:55,657 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2018-10-02 11:57:55,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-02 11:57:55,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-02 11:57:55,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-02 11:57:55,658 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 15 states. [2018-10-02 11:57:55,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:57:55,895 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-02 11:57:55,896 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-02 11:57:55,896 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 15 [2018-10-02 11:57:55,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:57:55,897 INFO L225 Difference]: With dead ends: 19 [2018-10-02 11:57:55,897 INFO L226 Difference]: Without dead ends: 17 [2018-10-02 11:57:55,898 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2018-10-02 11:57:55,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-10-02 11:57:55,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-10-02 11:57:55,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-02 11:57:55,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-02 11:57:55,902 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2018-10-02 11:57:55,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:57:55,903 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-02 11:57:55,903 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-02 11:57:55,903 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-02 11:57:55,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-02 11:57:55,904 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:57:55,904 INFO L375 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1] [2018-10-02 11:57:55,904 INFO L423 AbstractCegarLoop]: === Iteration 13 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:57:55,904 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:57:55,904 INFO L82 PathProgramCache]: Analyzing trace with hash -1898674972, now seen corresponding path program 12 times [2018-10-02 11:57:55,904 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:57:55,904 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:57:55,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:55,905 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:57:55,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:55,915 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:57:55,915 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:57:55,916 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 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:57:55,924 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-02 11:57:55,962 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-02 11:57:55,963 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:57:55,967 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:57:56,393 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:56,415 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:57:56,416 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2018-10-02 11:57:56,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-02 11:57:56,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-02 11:57:56,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-02 11:57:56,417 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 16 states. [2018-10-02 11:57:56,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:57:56,872 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2018-10-02 11:57:56,872 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-02 11:57:56,872 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 16 [2018-10-02 11:57:56,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:57:56,873 INFO L225 Difference]: With dead ends: 20 [2018-10-02 11:57:56,873 INFO L226 Difference]: Without dead ends: 18 [2018-10-02 11:57:56,874 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2018-10-02 11:57:56,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-02 11:57:56,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-02 11:57:56,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-02 11:57:56,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-02 11:57:56,879 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2018-10-02 11:57:56,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:57:56,879 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-02 11:57:56,879 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-02 11:57:56,880 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-02 11:57:56,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-02 11:57:56,880 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:57:56,880 INFO L375 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1] [2018-10-02 11:57:56,880 INFO L423 AbstractCegarLoop]: === Iteration 14 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:57:56,881 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:57:56,881 INFO L82 PathProgramCache]: Analyzing trace with hash 1270616037, now seen corresponding path program 13 times [2018-10-02 11:57:56,881 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:57:56,881 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:57:56,882 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:56,882 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:57:56,882 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:56,891 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:57:56,891 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:57:56,891 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 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:57:56,900 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:57:56,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:57:56,950 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:57:57,263 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:57,285 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:57:57,285 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2018-10-02 11:57:57,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-02 11:57:57,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-02 11:57:57,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-02 11:57:57,287 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 17 states. [2018-10-02 11:57:57,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:57:57,934 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-02 11:57:57,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-02 11:57:57,935 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 17 [2018-10-02 11:57:57,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:57:57,936 INFO L225 Difference]: With dead ends: 21 [2018-10-02 11:57:57,936 INFO L226 Difference]: Without dead ends: 19 [2018-10-02 11:57:57,937 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2018-10-02 11:57:57,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-02 11:57:57,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-02 11:57:57,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-02 11:57:57,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-10-02 11:57:57,942 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2018-10-02 11:57:57,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:57:57,943 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-10-02 11:57:57,943 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-02 11:57:57,943 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-10-02 11:57:57,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-02 11:57:57,943 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:57:57,944 INFO L375 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1] [2018-10-02 11:57:57,944 INFO L423 AbstractCegarLoop]: === Iteration 15 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:57:57,944 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:57:57,944 INFO L82 PathProgramCache]: Analyzing trace with hash 734389508, now seen corresponding path program 14 times [2018-10-02 11:57:57,944 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:57:57,945 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:57:57,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:57,945 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:57:57,946 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:57,955 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:57:57,955 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:57:57,955 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 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:57:57,967 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 11:57:58,023 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 11:57:58,024 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:57:58,026 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:57:58,285 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:58,305 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:57:58,305 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2018-10-02 11:57:58,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-02 11:57:58,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-02 11:57:58,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-02 11:57:58,306 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 18 states. [2018-10-02 11:57:58,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:57:58,619 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-10-02 11:57:58,620 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-02 11:57:58,620 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 18 [2018-10-02 11:57:58,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:57:58,620 INFO L225 Difference]: With dead ends: 22 [2018-10-02 11:57:58,620 INFO L226 Difference]: Without dead ends: 20 [2018-10-02 11:57:58,621 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2018-10-02 11:57:58,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-02 11:57:58,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-02 11:57:58,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-02 11:57:58,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-02 11:57:58,625 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2018-10-02 11:57:58,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:57:58,625 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-02 11:57:58,625 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-02 11:57:58,626 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-02 11:57:58,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-02 11:57:58,626 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:57:58,626 INFO L375 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1] [2018-10-02 11:57:58,626 INFO L423 AbstractCegarLoop]: === Iteration 16 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:57:58,627 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:57:58,627 INFO L82 PathProgramCache]: Analyzing trace with hash 1291236293, now seen corresponding path program 15 times [2018-10-02 11:57:58,627 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:57:58,627 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:57:58,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:58,628 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:57:58,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:57:58,637 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:57:58,637 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:57:58,637 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:57:58,658 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 11:57:58,761 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-02 11:57:58,761 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:57:58,764 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:57:59,962 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:57:59,983 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:57:59,983 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2018-10-02 11:57:59,983 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-02 11:57:59,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-02 11:57:59,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-02 11:57:59,984 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 19 states. [2018-10-02 11:58:00,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:00,501 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-02 11:58:00,501 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-02 11:58:00,501 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 19 [2018-10-02 11:58:00,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:00,502 INFO L225 Difference]: With dead ends: 23 [2018-10-02 11:58:00,502 INFO L226 Difference]: Without dead ends: 21 [2018-10-02 11:58:00,503 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=39, Invalid=341, Unknown=0, NotChecked=0, Total=380 [2018-10-02 11:58:00,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-02 11:58:00,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-10-02 11:58:00,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-02 11:58:00,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-10-02 11:58:00,508 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2018-10-02 11:58:00,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:00,508 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-10-02 11:58:00,508 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-02 11:58:00,509 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-10-02 11:58:00,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-02 11:58:00,509 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:00,509 INFO L375 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1] [2018-10-02 11:58:00,509 INFO L423 AbstractCegarLoop]: === Iteration 17 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:00,510 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:00,510 INFO L82 PathProgramCache]: Analyzing trace with hash 1373617444, now seen corresponding path program 16 times [2018-10-02 11:58:00,510 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:00,510 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:00,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:00,514 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:00,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:00,523 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:00,524 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:00,524 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:00,538 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 11:58:00,651 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 11:58:00,651 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:00,654 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:01,025 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:01,045 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:01,045 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2018-10-02 11:58:01,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-02 11:58:01,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-02 11:58:01,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-02 11:58:01,046 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 20 states. [2018-10-02 11:58:01,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:01,416 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-02 11:58:01,416 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-02 11:58:01,416 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 20 [2018-10-02 11:58:01,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:01,417 INFO L225 Difference]: With dead ends: 24 [2018-10-02 11:58:01,417 INFO L226 Difference]: Without dead ends: 22 [2018-10-02 11:58:01,418 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=41, Invalid=379, Unknown=0, NotChecked=0, Total=420 [2018-10-02 11:58:01,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-02 11:58:01,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-02 11:58:01,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-02 11:58:01,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-02 11:58:01,423 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2018-10-02 11:58:01,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:01,424 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-02 11:58:01,424 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-02 11:58:01,424 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-02 11:58:01,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-02 11:58:01,424 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:01,425 INFO L375 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1] [2018-10-02 11:58:01,425 INFO L423 AbstractCegarLoop]: === Iteration 18 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:01,425 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:01,425 INFO L82 PathProgramCache]: Analyzing trace with hash -367534171, now seen corresponding path program 17 times [2018-10-02 11:58:01,425 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:01,425 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:01,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:01,426 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:01,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:01,435 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:01,435 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:01,435 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:01,446 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 11:58:01,546 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2018-10-02 11:58:01,546 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:01,549 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:01,927 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:01,948 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:01,948 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2018-10-02 11:58:01,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-02 11:58:01,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-02 11:58:01,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-10-02 11:58:01,949 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 21 states. [2018-10-02 11:58:02,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:02,417 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-02 11:58:02,418 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-02 11:58:02,418 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 21 [2018-10-02 11:58:02,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:02,419 INFO L225 Difference]: With dead ends: 25 [2018-10-02 11:58:02,419 INFO L226 Difference]: Without dead ends: 23 [2018-10-02 11:58:02,420 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2018-10-02 11:58:02,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-10-02 11:58:02,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-10-02 11:58:02,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-02 11:58:02,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-10-02 11:58:02,425 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2018-10-02 11:58:02,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:02,426 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-10-02 11:58:02,426 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-02 11:58:02,426 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-10-02 11:58:02,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-02 11:58:02,426 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:02,427 INFO L375 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1] [2018-10-02 11:58:02,427 INFO L423 AbstractCegarLoop]: === Iteration 19 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:02,427 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:02,427 INFO L82 PathProgramCache]: Analyzing trace with hash 1491340612, now seen corresponding path program 18 times [2018-10-02 11:58:02,427 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:02,428 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:02,428 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:02,429 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:02,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:02,438 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:02,438 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:02,438 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:02,453 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-02 11:58:02,566 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2018-10-02 11:58:02,566 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:02,569 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:02,944 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:02,965 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:02,965 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2018-10-02 11:58:02,966 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-02 11:58:02,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-02 11:58:02,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-10-02 11:58:02,967 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 22 states. [2018-10-02 11:58:03,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:03,371 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2018-10-02 11:58:03,371 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-02 11:58:03,371 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 22 [2018-10-02 11:58:03,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:03,372 INFO L225 Difference]: With dead ends: 26 [2018-10-02 11:58:03,372 INFO L226 Difference]: Without dead ends: 24 [2018-10-02 11:58:03,373 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=461, Unknown=0, NotChecked=0, Total=506 [2018-10-02 11:58:03,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-02 11:58:03,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-02 11:58:03,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-02 11:58:03,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-02 11:58:03,378 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2018-10-02 11:58:03,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:03,378 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-02 11:58:03,378 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-02 11:58:03,378 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-02 11:58:03,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-02 11:58:03,379 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:03,379 INFO L375 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1] [2018-10-02 11:58:03,379 INFO L423 AbstractCegarLoop]: === Iteration 20 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:03,379 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:03,380 INFO L82 PathProgramCache]: Analyzing trace with hash -1013083259, now seen corresponding path program 19 times [2018-10-02 11:58:03,380 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:03,380 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:03,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:03,381 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:03,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:03,389 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:03,389 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:03,389 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:03,411 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:58:03,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:58:03,549 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:03,971 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:03,991 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:03,991 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2018-10-02 11:58:03,991 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-02 11:58:03,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-02 11:58:03,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-10-02 11:58:03,992 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 23 states. [2018-10-02 11:58:04,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:04,731 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-02 11:58:04,732 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-02 11:58:04,732 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 23 [2018-10-02 11:58:04,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:04,733 INFO L225 Difference]: With dead ends: 27 [2018-10-02 11:58:04,733 INFO L226 Difference]: Without dead ends: 25 [2018-10-02 11:58:04,734 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=47, Invalid=505, Unknown=0, NotChecked=0, Total=552 [2018-10-02 11:58:04,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-02 11:58:04,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-02 11:58:04,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-02 11:58:04,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-10-02 11:58:04,738 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2018-10-02 11:58:04,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:04,738 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-10-02 11:58:04,739 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-02 11:58:04,739 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-10-02 11:58:04,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-02 11:58:04,739 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:04,739 INFO L375 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1] [2018-10-02 11:58:04,740 INFO L423 AbstractCegarLoop]: === Iteration 21 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:04,740 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:04,740 INFO L82 PathProgramCache]: Analyzing trace with hash -1340811932, now seen corresponding path program 20 times [2018-10-02 11:58:04,740 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:04,740 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:04,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:04,741 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:58:04,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:04,750 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:04,750 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:04,750 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:04,774 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 11:58:04,931 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 11:58:04,932 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:04,934 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:05,424 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:05,444 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:05,445 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2018-10-02 11:58:05,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-02 11:58:05,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-02 11:58:05,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-10-02 11:58:05,446 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 24 states. [2018-10-02 11:58:05,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:05,904 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-10-02 11:58:05,905 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-02 11:58:05,905 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 24 [2018-10-02 11:58:05,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:05,906 INFO L225 Difference]: With dead ends: 28 [2018-10-02 11:58:05,906 INFO L226 Difference]: Without dead ends: 26 [2018-10-02 11:58:05,906 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=49, Invalid=551, Unknown=0, NotChecked=0, Total=600 [2018-10-02 11:58:05,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-02 11:58:05,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-02 11:58:05,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-02 11:58:05,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-02 11:58:05,912 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2018-10-02 11:58:05,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:05,912 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-02 11:58:05,912 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-02 11:58:05,913 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-02 11:58:05,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-02 11:58:05,913 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:05,913 INFO L375 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1] [2018-10-02 11:58:05,914 INFO L423 AbstractCegarLoop]: === Iteration 22 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:05,914 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:05,914 INFO L82 PathProgramCache]: Analyzing trace with hash 1384501093, now seen corresponding path program 21 times [2018-10-02 11:58:05,914 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:05,914 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:05,915 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:05,915 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:05,915 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:05,923 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:05,923 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:05,923 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:05,942 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 11:58:06,125 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-02 11:58:06,126 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:06,128 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:06,872 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:06,892 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:06,892 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2018-10-02 11:58:06,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-02 11:58:06,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-02 11:58:06,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-10-02 11:58:06,893 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 25 states. [2018-10-02 11:58:07,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:07,618 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-10-02 11:58:07,622 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-02 11:58:07,622 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 25 [2018-10-02 11:58:07,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:07,622 INFO L225 Difference]: With dead ends: 29 [2018-10-02 11:58:07,622 INFO L226 Difference]: Without dead ends: 27 [2018-10-02 11:58:07,623 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2018-10-02 11:58:07,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-02 11:58:07,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-10-02 11:58:07,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-02 11:58:07,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-10-02 11:58:07,627 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2018-10-02 11:58:07,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:07,627 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-10-02 11:58:07,627 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-02 11:58:07,627 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-10-02 11:58:07,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-02 11:58:07,628 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:07,628 INFO L375 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1] [2018-10-02 11:58:07,628 INFO L423 AbstractCegarLoop]: === Iteration 23 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:07,628 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:07,628 INFO L82 PathProgramCache]: Analyzing trace with hash -30141052, now seen corresponding path program 22 times [2018-10-02 11:58:07,628 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:07,628 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:07,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:07,629 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:07,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:07,636 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:07,636 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:07,636 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:07,656 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 11:58:07,845 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 11:58:07,845 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:07,848 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:08,342 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:08,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:08,372 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2018-10-02 11:58:08,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-02 11:58:08,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-02 11:58:08,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2018-10-02 11:58:08,373 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 26 states. [2018-10-02 11:58:09,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:09,080 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-02 11:58:09,081 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-02 11:58:09,081 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 26 [2018-10-02 11:58:09,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:09,082 INFO L225 Difference]: With dead ends: 30 [2018-10-02 11:58:09,082 INFO L226 Difference]: Without dead ends: 28 [2018-10-02 11:58:09,083 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2018-10-02 11:58:09,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-02 11:58:09,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-02 11:58:09,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-02 11:58:09,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-02 11:58:09,089 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2018-10-02 11:58:09,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:09,089 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-02 11:58:09,090 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-02 11:58:09,090 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-02 11:58:09,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-02 11:58:09,090 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:09,090 INFO L375 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1] [2018-10-02 11:58:09,091 INFO L423 AbstractCegarLoop]: === Iteration 24 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:09,091 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:09,091 INFO L82 PathProgramCache]: Analyzing trace with hash -934374587, now seen corresponding path program 23 times [2018-10-02 11:58:09,091 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:09,091 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:09,092 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:09,092 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:09,092 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:09,098 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:09,098 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:09,098 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2018-10-02 11:58:09,110 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:09,360 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2018-10-02 11:58:09,360 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:09,364 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:10,027 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:10,047 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:10,048 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2018-10-02 11:58:10,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-02 11:58:10,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-02 11:58:10,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2018-10-02 11:58:10,049 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 27 states. [2018-10-02 11:58:10,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:10,612 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-10-02 11:58:10,612 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-02 11:58:10,612 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 27 [2018-10-02 11:58:10,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:10,613 INFO L225 Difference]: With dead ends: 31 [2018-10-02 11:58:10,613 INFO L226 Difference]: Without dead ends: 29 [2018-10-02 11:58:10,614 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2018-10-02 11:58:10,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-02 11:58:10,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-10-02 11:58:10,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-02 11:58:10,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-10-02 11:58:10,619 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2018-10-02 11:58:10,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:10,620 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-10-02 11:58:10,620 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-02 11:58:10,620 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-10-02 11:58:10,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-02 11:58:10,621 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:10,621 INFO L375 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1] [2018-10-02 11:58:10,621 INFO L423 AbstractCegarLoop]: === Iteration 25 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:10,621 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:10,621 INFO L82 PathProgramCache]: Analyzing trace with hash 1099156900, now seen corresponding path program 24 times [2018-10-02 11:58:10,621 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:10,621 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:10,622 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:10,622 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:10,622 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:10,629 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:10,629 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:10,629 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:10,647 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-02 11:58:10,917 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-02 11:58:10,917 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:10,920 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:11,815 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:11,835 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:11,835 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2018-10-02 11:58:11,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-02 11:58:11,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-02 11:58:11,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2018-10-02 11:58:11,837 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 28 states. [2018-10-02 11:58:12,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:12,477 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-10-02 11:58:12,477 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-02 11:58:12,477 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 28 [2018-10-02 11:58:12,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:12,478 INFO L225 Difference]: With dead ends: 32 [2018-10-02 11:58:12,478 INFO L226 Difference]: Without dead ends: 30 [2018-10-02 11:58:12,479 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=57, Invalid=755, Unknown=0, NotChecked=0, Total=812 [2018-10-02 11:58:12,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-02 11:58:12,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-02 11:58:12,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-02 11:58:12,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-02 11:58:12,484 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2018-10-02 11:58:12,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:12,484 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-02 11:58:12,484 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-02 11:58:12,484 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-02 11:58:12,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-02 11:58:12,485 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:12,485 INFO L375 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1] [2018-10-02 11:58:12,485 INFO L423 AbstractCegarLoop]: === Iteration 26 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:12,486 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:12,486 INFO L82 PathProgramCache]: Analyzing trace with hash -285876443, now seen corresponding path program 25 times [2018-10-02 11:58:12,486 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:12,486 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:12,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:12,487 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:12,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:12,493 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:12,493 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:12,494 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:12,509 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:58:12,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:58:12,839 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:13,353 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:13,374 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:13,374 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2018-10-02 11:58:13,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-02 11:58:13,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-02 11:58:13,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2018-10-02 11:58:13,375 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 29 states. [2018-10-02 11:58:14,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:14,110 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-02 11:58:14,110 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-02 11:58:14,110 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 29 [2018-10-02 11:58:14,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:14,111 INFO L225 Difference]: With dead ends: 33 [2018-10-02 11:58:14,111 INFO L226 Difference]: Without dead ends: 31 [2018-10-02 11:58:14,112 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2018-10-02 11:58:14,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-02 11:58:14,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-10-02 11:58:14,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-02 11:58:14,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-10-02 11:58:14,117 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2018-10-02 11:58:14,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:14,117 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-10-02 11:58:14,117 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-02 11:58:14,117 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-10-02 11:58:14,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-02 11:58:14,118 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:14,118 INFO L375 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1] [2018-10-02 11:58:14,118 INFO L423 AbstractCegarLoop]: === Iteration 27 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:14,118 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:14,118 INFO L82 PathProgramCache]: Analyzing trace with hash -272237116, now seen corresponding path program 26 times [2018-10-02 11:58:14,119 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:14,119 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:14,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:14,119 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:58:14,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:14,125 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:14,125 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:14,126 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:14,136 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 11:58:14,524 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 11:58:14,524 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:14,529 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:15,656 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:15,676 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:15,676 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2018-10-02 11:58:15,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-02 11:58:15,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-02 11:58:15,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2018-10-02 11:58:15,677 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 30 states. [2018-10-02 11:58:16,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:16,340 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-10-02 11:58:16,341 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-02 11:58:16,341 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 30 [2018-10-02 11:58:16,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:16,341 INFO L225 Difference]: With dead ends: 34 [2018-10-02 11:58:16,342 INFO L226 Difference]: Without dead ends: 32 [2018-10-02 11:58:16,342 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=61, Invalid=869, Unknown=0, NotChecked=0, Total=930 [2018-10-02 11:58:16,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-02 11:58:16,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-02 11:58:16,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-02 11:58:16,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-02 11:58:16,348 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2018-10-02 11:58:16,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:16,348 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-02 11:58:16,348 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-02 11:58:16,349 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-02 11:58:16,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-02 11:58:16,349 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:16,349 INFO L375 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1] [2018-10-02 11:58:16,350 INFO L423 AbstractCegarLoop]: === Iteration 28 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:16,350 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:16,350 INFO L82 PathProgramCache]: Analyzing trace with hash 150582021, now seen corresponding path program 27 times [2018-10-02 11:58:16,350 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:16,350 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:16,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:16,351 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:16,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:16,358 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:16,358 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:16,359 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:16,374 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 11:58:16,819 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-02 11:58:16,819 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:16,822 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:17,466 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:17,486 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:17,487 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2018-10-02 11:58:17,487 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-02 11:58:17,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-02 11:58:17,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2018-10-02 11:58:17,488 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 31 states. [2018-10-02 11:58:18,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:18,234 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-10-02 11:58:18,235 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-02 11:58:18,235 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 31 [2018-10-02 11:58:18,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:18,235 INFO L225 Difference]: With dead ends: 35 [2018-10-02 11:58:18,236 INFO L226 Difference]: Without dead ends: 33 [2018-10-02 11:58:18,236 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2018-10-02 11:58:18,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-02 11:58:18,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-10-02 11:58:18,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-02 11:58:18,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-02 11:58:18,241 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2018-10-02 11:58:18,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:18,241 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-02 11:58:18,241 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-02 11:58:18,242 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-02 11:58:18,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-02 11:58:18,242 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:18,242 INFO L375 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1] [2018-10-02 11:58:18,243 INFO L423 AbstractCegarLoop]: === Iteration 29 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:18,243 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:18,243 INFO L82 PathProgramCache]: Analyzing trace with hash 373073380, now seen corresponding path program 28 times [2018-10-02 11:58:18,243 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:18,243 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:18,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:18,244 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:18,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:18,251 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:18,251 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:18,251 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2018-10-02 11:58:18,270 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:18,789 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 11:58:18,789 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:18,794 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:19,413 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:19,434 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:19,434 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2018-10-02 11:58:19,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-02 11:58:19,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-02 11:58:19,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2018-10-02 11:58:19,435 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 32 states. [2018-10-02 11:58:20,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:20,318 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-02 11:58:20,318 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-02 11:58:20,319 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 32 [2018-10-02 11:58:20,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:20,319 INFO L225 Difference]: With dead ends: 36 [2018-10-02 11:58:20,319 INFO L226 Difference]: Without dead ends: 34 [2018-10-02 11:58:20,321 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=65, Invalid=991, Unknown=0, NotChecked=0, Total=1056 [2018-10-02 11:58:20,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-02 11:58:20,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-02 11:58:20,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-02 11:58:20,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-02 11:58:20,325 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2018-10-02 11:58:20,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:20,325 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-02 11:58:20,325 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-02 11:58:20,325 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-02 11:58:20,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-02 11:58:20,326 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:20,326 INFO L375 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1] [2018-10-02 11:58:20,326 INFO L423 AbstractCegarLoop]: === Iteration 30 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:20,326 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:20,327 INFO L82 PathProgramCache]: Analyzing trace with hash -1319629083, now seen corresponding path program 29 times [2018-10-02 11:58:20,327 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:20,327 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:20,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:20,328 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:20,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:20,334 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:20,334 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:20,334 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:20,350 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 11:58:20,849 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2018-10-02 11:58:20,849 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:20,854 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:21,543 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:21,563 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:21,564 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2018-10-02 11:58:21,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-02 11:58:21,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-02 11:58:21,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2018-10-02 11:58:21,565 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 33 states. [2018-10-02 11:58:22,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:22,367 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-10-02 11:58:22,367 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-02 11:58:22,367 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 33 [2018-10-02 11:58:22,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:22,368 INFO L225 Difference]: With dead ends: 37 [2018-10-02 11:58:22,368 INFO L226 Difference]: Without dead ends: 35 [2018-10-02 11:58:22,369 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=67, Invalid=1055, Unknown=0, NotChecked=0, Total=1122 [2018-10-02 11:58:22,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-10-02 11:58:22,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-10-02 11:58:22,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-02 11:58:22,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-10-02 11:58:22,373 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2018-10-02 11:58:22,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:22,374 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-10-02 11:58:22,374 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-02 11:58:22,374 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-10-02 11:58:22,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-02 11:58:22,374 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:22,374 INFO L375 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1] [2018-10-02 11:58:22,374 INFO L423 AbstractCegarLoop]: === Iteration 31 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:22,374 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:22,375 INFO L82 PathProgramCache]: Analyzing trace with hash 2041169412, now seen corresponding path program 30 times [2018-10-02 11:58:22,375 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:22,375 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:22,375 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:22,375 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:22,375 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:22,384 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:22,384 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:22,384 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:22,407 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-02 11:58:23,197 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2018-10-02 11:58:23,197 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:23,201 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:23,949 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:23,969 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:23,969 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2018-10-02 11:58:23,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-02 11:58:23,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-02 11:58:23,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2018-10-02 11:58:23,970 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 34 states. [2018-10-02 11:58:24,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:24,953 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-10-02 11:58:24,953 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-02 11:58:24,953 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 34 [2018-10-02 11:58:24,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:24,954 INFO L225 Difference]: With dead ends: 38 [2018-10-02 11:58:24,954 INFO L226 Difference]: Without dead ends: 36 [2018-10-02 11:58:24,955 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=69, Invalid=1121, Unknown=0, NotChecked=0, Total=1190 [2018-10-02 11:58:24,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-02 11:58:24,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-02 11:58:24,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-02 11:58:24,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-02 11:58:24,960 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2018-10-02 11:58:24,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:24,960 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-02 11:58:24,960 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-02 11:58:24,960 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-02 11:58:24,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-02 11:58:24,961 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:24,961 INFO L375 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1] [2018-10-02 11:58:24,961 INFO L423 AbstractCegarLoop]: === Iteration 32 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:24,962 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:24,962 INFO L82 PathProgramCache]: Analyzing trace with hash -1148259643, now seen corresponding path program 31 times [2018-10-02 11:58:24,962 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:24,962 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:24,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:24,963 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:24,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:24,969 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:24,969 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:24,969 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:24,985 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:58:25,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:58:25,610 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:26,538 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:26,559 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:26,559 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2018-10-02 11:58:26,560 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-02 11:58:26,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-02 11:58:26,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2018-10-02 11:58:26,560 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 35 states. [2018-10-02 11:58:27,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:27,470 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-02 11:58:27,470 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-02 11:58:27,470 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 35 [2018-10-02 11:58:27,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:27,471 INFO L225 Difference]: With dead ends: 39 [2018-10-02 11:58:27,471 INFO L226 Difference]: Without dead ends: 37 [2018-10-02 11:58:27,472 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=71, Invalid=1189, Unknown=0, NotChecked=0, Total=1260 [2018-10-02 11:58:27,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-02 11:58:27,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-10-02 11:58:27,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-02 11:58:27,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-10-02 11:58:27,477 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2018-10-02 11:58:27,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:27,477 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-10-02 11:58:27,477 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-02 11:58:27,477 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-10-02 11:58:27,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-02 11:58:27,478 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:27,478 INFO L375 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1] [2018-10-02 11:58:27,478 INFO L423 AbstractCegarLoop]: === Iteration 33 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:27,479 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:27,479 INFO L82 PathProgramCache]: Analyzing trace with hash -1236312540, now seen corresponding path program 32 times [2018-10-02 11:58:27,479 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:27,479 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:27,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:27,480 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:58:27,480 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:27,486 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:27,486 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:27,486 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:27,495 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 11:58:28,171 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 11:58:28,172 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:28,176 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:28,927 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:28,947 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:28,947 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2018-10-02 11:58:28,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-02 11:58:28,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-02 11:58:28,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2018-10-02 11:58:28,948 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 36 states. [2018-10-02 11:58:30,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:30,008 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-10-02 11:58:30,009 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-02 11:58:30,009 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 36 [2018-10-02 11:58:30,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:30,009 INFO L225 Difference]: With dead ends: 40 [2018-10-02 11:58:30,010 INFO L226 Difference]: Without dead ends: 38 [2018-10-02 11:58:30,011 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=73, Invalid=1259, Unknown=0, NotChecked=0, Total=1332 [2018-10-02 11:58:30,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-02 11:58:30,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-02 11:58:30,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-02 11:58:30,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-02 11:58:30,015 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2018-10-02 11:58:30,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:30,015 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-02 11:58:30,015 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-02 11:58:30,016 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-02 11:58:30,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-02 11:58:30,016 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:30,016 INFO L375 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1] [2018-10-02 11:58:30,017 INFO L423 AbstractCegarLoop]: === Iteration 34 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:30,017 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:30,017 INFO L82 PathProgramCache]: Analyzing trace with hash 329014949, now seen corresponding path program 33 times [2018-10-02 11:58:30,017 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:30,017 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:30,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:30,018 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:30,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:30,023 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:30,024 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:30,024 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:30,040 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 11:58:30,736 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-02 11:58:30,737 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:30,741 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:31,658 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:31,678 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:31,678 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2018-10-02 11:58:31,678 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-02 11:58:31,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-02 11:58:31,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2018-10-02 11:58:31,679 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 37 states. [2018-10-02 11:58:32,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:32,679 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-10-02 11:58:32,680 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-02 11:58:32,680 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 37 [2018-10-02 11:58:32,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:32,680 INFO L225 Difference]: With dead ends: 41 [2018-10-02 11:58:32,681 INFO L226 Difference]: Without dead ends: 39 [2018-10-02 11:58:32,682 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=75, Invalid=1331, Unknown=0, NotChecked=0, Total=1406 [2018-10-02 11:58:32,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-02 11:58:32,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-10-02 11:58:32,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-02 11:58:32,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-10-02 11:58:32,686 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2018-10-02 11:58:32,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:32,686 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-10-02 11:58:32,686 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-02 11:58:32,686 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-10-02 11:58:32,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-02 11:58:32,687 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:32,687 INFO L375 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1] [2018-10-02 11:58:32,687 INFO L423 AbstractCegarLoop]: === Iteration 35 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:32,687 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:32,687 INFO L82 PathProgramCache]: Analyzing trace with hash 1609526852, now seen corresponding path program 34 times [2018-10-02 11:58:32,687 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:32,688 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:32,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:32,688 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:32,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:32,695 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:32,695 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:32,695 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:32,710 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 11:58:33,454 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 11:58:33,455 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:33,460 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:34,299 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:34,319 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:34,319 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2018-10-02 11:58:34,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-02 11:58:34,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-02 11:58:34,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2018-10-02 11:58:34,320 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 38 states. [2018-10-02 11:58:35,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:35,574 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-02 11:58:35,574 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-02 11:58:35,574 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 38 [2018-10-02 11:58:35,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:35,575 INFO L225 Difference]: With dead ends: 42 [2018-10-02 11:58:35,575 INFO L226 Difference]: Without dead ends: 40 [2018-10-02 11:58:35,576 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=77, Invalid=1405, Unknown=0, NotChecked=0, Total=1482 [2018-10-02 11:58:35,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-02 11:58:35,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-10-02 11:58:35,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-02 11:58:35,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-10-02 11:58:35,582 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2018-10-02 11:58:35,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:35,582 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-10-02 11:58:35,582 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-02 11:58:35,582 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-10-02 11:58:35,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-02 11:58:35,583 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:35,583 INFO L375 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1] [2018-10-02 11:58:35,583 INFO L423 AbstractCegarLoop]: === Iteration 36 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:35,583 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:35,583 INFO L82 PathProgramCache]: Analyzing trace with hash -1644277115, now seen corresponding path program 35 times [2018-10-02 11:58:35,584 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:35,584 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:35,584 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:35,584 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:35,584 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:35,591 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:35,591 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:35,591 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:35,604 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 11:58:36,565 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2018-10-02 11:58:36,565 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:36,572 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:37,857 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:37,877 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:37,878 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2018-10-02 11:58:37,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-02 11:58:37,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-02 11:58:37,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2018-10-02 11:58:37,879 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 39 states. [2018-10-02 11:58:38,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:38,987 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-10-02 11:58:38,988 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-02 11:58:38,988 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 39 [2018-10-02 11:58:38,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:38,989 INFO L225 Difference]: With dead ends: 43 [2018-10-02 11:58:38,989 INFO L226 Difference]: Without dead ends: 41 [2018-10-02 11:58:38,990 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=79, Invalid=1481, Unknown=0, NotChecked=0, Total=1560 [2018-10-02 11:58:38,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-10-02 11:58:38,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-10-02 11:58:38,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-02 11:58:38,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-10-02 11:58:38,994 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2018-10-02 11:58:38,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:38,994 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-10-02 11:58:38,994 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-02 11:58:38,994 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-10-02 11:58:38,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-02 11:58:38,994 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:38,994 INFO L375 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1] [2018-10-02 11:58:38,994 INFO L423 AbstractCegarLoop]: === Iteration 37 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:38,995 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:38,995 INFO L82 PathProgramCache]: Analyzing trace with hash 567015012, now seen corresponding path program 36 times [2018-10-02 11:58:38,995 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:38,995 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:38,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:38,996 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:38,996 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:39,002 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:39,002 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:39,002 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:39,015 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-02 11:58:39,755 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-10-02 11:58:39,756 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:39,760 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:40,741 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:40,762 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:40,762 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2018-10-02 11:58:40,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-02 11:58:40,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-02 11:58:40,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2018-10-02 11:58:40,763 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 40 states. [2018-10-02 11:58:41,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:41,974 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-10-02 11:58:41,974 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-02 11:58:41,974 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 40 [2018-10-02 11:58:41,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:41,975 INFO L225 Difference]: With dead ends: 44 [2018-10-02 11:58:41,975 INFO L226 Difference]: Without dead ends: 42 [2018-10-02 11:58:41,976 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=81, Invalid=1559, Unknown=0, NotChecked=0, Total=1640 [2018-10-02 11:58:41,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-02 11:58:41,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-02 11:58:41,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-02 11:58:41,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-02 11:58:41,980 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2018-10-02 11:58:41,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:41,980 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-02 11:58:41,980 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-02 11:58:41,981 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-02 11:58:41,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-02 11:58:41,981 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:41,981 INFO L375 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1] [2018-10-02 11:58:41,981 INFO L423 AbstractCegarLoop]: === Iteration 38 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:41,981 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:41,982 INFO L82 PathProgramCache]: Analyzing trace with hash 397594213, now seen corresponding path program 37 times [2018-10-02 11:58:41,982 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:41,982 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:41,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:41,983 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:41,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:41,988 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:41,988 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:41,988 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:42,005 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:58:43,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:58:43,320 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:44,359 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:44,378 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:44,379 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2018-10-02 11:58:44,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-02 11:58:44,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-02 11:58:44,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2018-10-02 11:58:44,380 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 41 states. [2018-10-02 11:58:45,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:45,687 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-02 11:58:45,687 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-02 11:58:45,687 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 41 [2018-10-02 11:58:45,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:45,688 INFO L225 Difference]: With dead ends: 45 [2018-10-02 11:58:45,688 INFO L226 Difference]: Without dead ends: 43 [2018-10-02 11:58:45,689 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=83, Invalid=1639, Unknown=0, NotChecked=0, Total=1722 [2018-10-02 11:58:45,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-02 11:58:45,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-10-02 11:58:45,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-02 11:58:45,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-10-02 11:58:45,693 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2018-10-02 11:58:45,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:45,693 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-10-02 11:58:45,693 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-02 11:58:45,693 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-10-02 11:58:45,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-10-02 11:58:45,694 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:45,694 INFO L375 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1] [2018-10-02 11:58:45,694 INFO L423 AbstractCegarLoop]: === Iteration 39 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:45,694 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:45,694 INFO L82 PathProgramCache]: Analyzing trace with hash -559483260, now seen corresponding path program 38 times [2018-10-02 11:58:45,695 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:45,695 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:45,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:45,695 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:58:45,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:45,701 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:45,701 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:45,701 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:45,714 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 11:58:46,689 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 11:58:46,690 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:46,697 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:47,722 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:47,742 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:47,742 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2018-10-02 11:58:47,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-02 11:58:47,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-02 11:58:47,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2018-10-02 11:58:47,744 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 42 states. [2018-10-02 11:58:49,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:49,053 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-10-02 11:58:49,054 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-02 11:58:49,054 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 42 [2018-10-02 11:58:49,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:49,055 INFO L225 Difference]: With dead ends: 46 [2018-10-02 11:58:49,055 INFO L226 Difference]: Without dead ends: 44 [2018-10-02 11:58:49,056 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=85, Invalid=1721, Unknown=0, NotChecked=0, Total=1806 [2018-10-02 11:58:49,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-10-02 11:58:49,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-10-02 11:58:49,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-02 11:58:49,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-02 11:58:49,060 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2018-10-02 11:58:49,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:49,060 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-02 11:58:49,060 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-02 11:58:49,060 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-02 11:58:49,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-02 11:58:49,060 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:49,060 INFO L375 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1] [2018-10-02 11:58:49,061 INFO L423 AbstractCegarLoop]: === Iteration 40 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:49,061 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:49,061 INFO L82 PathProgramCache]: Analyzing trace with hash -164113851, now seen corresponding path program 39 times [2018-10-02 11:58:49,061 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:49,061 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:49,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:49,062 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:49,062 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:49,067 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:49,068 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:49,068 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:49,090 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 11:58:50,319 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-02 11:58:50,319 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:50,323 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:51,446 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:51,466 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:51,466 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2018-10-02 11:58:51,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-02 11:58:51,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-02 11:58:51,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2018-10-02 11:58:51,467 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 43 states. [2018-10-02 11:58:52,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:52,844 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-10-02 11:58:52,845 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-02 11:58:52,845 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 43 [2018-10-02 11:58:52,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:52,846 INFO L225 Difference]: With dead ends: 47 [2018-10-02 11:58:52,846 INFO L226 Difference]: Without dead ends: 45 [2018-10-02 11:58:52,847 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=87, Invalid=1805, Unknown=0, NotChecked=0, Total=1892 [2018-10-02 11:58:52,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-02 11:58:52,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-10-02 11:58:52,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-02 11:58:52,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-10-02 11:58:52,852 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2018-10-02 11:58:52,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:52,852 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-10-02 11:58:52,852 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-02 11:58:52,852 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-10-02 11:58:52,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-02 11:58:52,852 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:52,853 INFO L375 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1] [2018-10-02 11:58:52,853 INFO L423 AbstractCegarLoop]: === Iteration 41 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:52,853 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:52,853 INFO L82 PathProgramCache]: Analyzing trace with hash -792564060, now seen corresponding path program 40 times [2018-10-02 11:58:52,853 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:52,853 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:52,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:52,854 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:52,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:52,858 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:52,859 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:52,859 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:52,866 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 11:58:54,085 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 11:58:54,086 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:54,094 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:55,281 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:55,301 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:55,301 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2018-10-02 11:58:55,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-02 11:58:55,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-02 11:58:55,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1807, Unknown=0, NotChecked=0, Total=1892 [2018-10-02 11:58:55,302 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 44 states. [2018-10-02 11:58:56,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:58:56,717 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-02 11:58:56,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-02 11:58:56,717 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 44 [2018-10-02 11:58:56,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:58:56,718 INFO L225 Difference]: With dead ends: 48 [2018-10-02 11:58:56,718 INFO L226 Difference]: Without dead ends: 46 [2018-10-02 11:58:56,719 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=89, Invalid=1891, Unknown=0, NotChecked=0, Total=1980 [2018-10-02 11:58:56,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-02 11:58:56,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-10-02 11:58:56,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-02 11:58:56,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-10-02 11:58:56,723 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2018-10-02 11:58:56,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:58:56,723 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-10-02 11:58:56,724 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-02 11:58:56,724 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-10-02 11:58:56,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-02 11:58:56,724 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:58:56,724 INFO L375 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1] [2018-10-02 11:58:56,724 INFO L423 AbstractCegarLoop]: === Iteration 42 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:58:56,724 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:58:56,725 INFO L82 PathProgramCache]: Analyzing trace with hash 1200315941, now seen corresponding path program 41 times [2018-10-02 11:58:56,725 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:58:56,725 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:58:56,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:56,725 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:58:56,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:58:56,730 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:58:56,730 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:58:56,730 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:58:56,739 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 11:58:58,302 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2018-10-02 11:58:58,303 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:58:58,313 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:58:59,399 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:58:59,421 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:58:59,421 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2018-10-02 11:58:59,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-02 11:58:59,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-02 11:58:59,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2018-10-02 11:58:59,422 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 45 states. [2018-10-02 11:59:00,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:59:00,932 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-10-02 11:59:00,933 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-02 11:59:00,933 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 45 [2018-10-02 11:59:00,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:59:00,934 INFO L225 Difference]: With dead ends: 49 [2018-10-02 11:59:00,934 INFO L226 Difference]: Without dead ends: 47 [2018-10-02 11:59:00,935 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=91, Invalid=1979, Unknown=0, NotChecked=0, Total=2070 [2018-10-02 11:59:00,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-10-02 11:59:00,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-10-02 11:59:00,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-02 11:59:00,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-10-02 11:59:00,939 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2018-10-02 11:59:00,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:59:00,939 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-10-02 11:59:00,939 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-02 11:59:00,939 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-10-02 11:59:00,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-02 11:59:00,939 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:59:00,940 INFO L375 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1] [2018-10-02 11:59:00,940 INFO L423 AbstractCegarLoop]: === Iteration 43 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:59:00,940 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:59:00,940 INFO L82 PathProgramCache]: Analyzing trace with hash -1444913468, now seen corresponding path program 42 times [2018-10-02 11:59:00,940 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:59:00,940 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:59:00,941 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:00,941 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:59:00,941 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:00,946 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:59:00,946 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:59:00,946 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:59:00,955 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-02 11:59:02,754 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 22 check-sat command(s) [2018-10-02 11:59:02,754 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:59:02,759 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:59:03,941 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:59:03,961 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:59:03,961 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2018-10-02 11:59:03,961 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-02 11:59:03,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-02 11:59:03,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1981, Unknown=0, NotChecked=0, Total=2070 [2018-10-02 11:59:03,962 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 46 states. [2018-10-02 11:59:05,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:59:05,582 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2018-10-02 11:59:05,582 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-02 11:59:05,583 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 46 [2018-10-02 11:59:05,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:59:05,583 INFO L225 Difference]: With dead ends: 50 [2018-10-02 11:59:05,583 INFO L226 Difference]: Without dead ends: 48 [2018-10-02 11:59:05,584 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=93, Invalid=2069, Unknown=0, NotChecked=0, Total=2162 [2018-10-02 11:59:05,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-02 11:59:05,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-02 11:59:05,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-02 11:59:05,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-02 11:59:05,588 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2018-10-02 11:59:05,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:59:05,589 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-02 11:59:05,589 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-02 11:59:05,589 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-02 11:59:05,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-02 11:59:05,589 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:59:05,589 INFO L375 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1] [2018-10-02 11:59:05,590 INFO L423 AbstractCegarLoop]: === Iteration 44 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:59:05,590 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:59:05,590 INFO L82 PathProgramCache]: Analyzing trace with hash -1842646523, now seen corresponding path program 43 times [2018-10-02 11:59:05,590 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:59:05,590 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:59:05,591 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:05,591 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:59:05,591 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:05,596 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:59:05,597 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:59:05,597 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:59:05,610 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:59:07,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:59:07,191 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:59:08,407 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:59:08,426 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:59:08,426 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2018-10-02 11:59:08,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-02 11:59:08,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-02 11:59:08,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=2071, Unknown=0, NotChecked=0, Total=2162 [2018-10-02 11:59:08,427 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 47 states. [2018-10-02 11:59:10,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:59:10,011 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-02 11:59:10,011 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-02 11:59:10,012 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 47 [2018-10-02 11:59:10,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:59:10,012 INFO L225 Difference]: With dead ends: 51 [2018-10-02 11:59:10,013 INFO L226 Difference]: Without dead ends: 49 [2018-10-02 11:59:10,013 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=95, Invalid=2161, Unknown=0, NotChecked=0, Total=2256 [2018-10-02 11:59:10,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-02 11:59:10,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-10-02 11:59:10,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-10-02 11:59:10,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-10-02 11:59:10,018 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2018-10-02 11:59:10,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:59:10,018 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-10-02 11:59:10,019 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-02 11:59:10,019 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-10-02 11:59:10,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-10-02 11:59:10,019 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:59:10,019 INFO L375 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1] [2018-10-02 11:59:10,019 INFO L423 AbstractCegarLoop]: === Iteration 45 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:59:10,020 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:59:10,020 INFO L82 PathProgramCache]: Analyzing trace with hash -1287469340, now seen corresponding path program 44 times [2018-10-02 11:59:10,020 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:59:10,020 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:59:10,021 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:10,021 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:59:10,021 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:10,026 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:59:10,027 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:59:10,027 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:59:10,041 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 11:59:11,720 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 11:59:11,720 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:59:11,729 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:59:13,006 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:59:13,025 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:59:13,026 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2018-10-02 11:59:13,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-02 11:59:13,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-02 11:59:13,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=2163, Unknown=0, NotChecked=0, Total=2256 [2018-10-02 11:59:13,027 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 48 states. [2018-10-02 11:59:14,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:59:14,679 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2018-10-02 11:59:14,680 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-02 11:59:14,680 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 48 [2018-10-02 11:59:14,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:59:14,681 INFO L225 Difference]: With dead ends: 52 [2018-10-02 11:59:14,681 INFO L226 Difference]: Without dead ends: 50 [2018-10-02 11:59:14,681 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=97, Invalid=2255, Unknown=0, NotChecked=0, Total=2352 [2018-10-02 11:59:14,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-10-02 11:59:14,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-10-02 11:59:14,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-02 11:59:14,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-02 11:59:14,685 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2018-10-02 11:59:14,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:59:14,685 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-02 11:59:14,685 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-02 11:59:14,685 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-02 11:59:14,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-02 11:59:14,686 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:59:14,686 INFO L375 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1] [2018-10-02 11:59:14,686 INFO L423 AbstractCegarLoop]: === Iteration 46 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:59:14,686 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:59:14,686 INFO L82 PathProgramCache]: Analyzing trace with hash -1256845851, now seen corresponding path program 45 times [2018-10-02 11:59:14,687 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:59:14,687 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:59:14,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:14,687 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:59:14,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:14,693 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:59:14,693 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:59:14,693 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:59:14,713 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 11:59:16,825 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-02 11:59:16,825 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:59:16,830 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:59:18,180 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:59:18,200 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:59:18,200 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2018-10-02 11:59:18,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-02 11:59:18,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-02 11:59:18,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=2257, Unknown=0, NotChecked=0, Total=2352 [2018-10-02 11:59:18,201 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 49 states. [2018-10-02 11:59:19,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:59:19,902 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-10-02 11:59:19,902 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-02 11:59:19,902 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 49 [2018-10-02 11:59:19,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:59:19,903 INFO L225 Difference]: With dead ends: 53 [2018-10-02 11:59:19,903 INFO L226 Difference]: Without dead ends: 51 [2018-10-02 11:59:19,904 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=99, Invalid=2351, Unknown=0, NotChecked=0, Total=2450 [2018-10-02 11:59:19,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-02 11:59:19,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-10-02 11:59:19,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-02 11:59:19,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-10-02 11:59:19,908 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2018-10-02 11:59:19,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:59:19,908 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-10-02 11:59:19,908 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-02 11:59:19,908 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-10-02 11:59:19,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-02 11:59:19,909 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:59:19,909 INFO L375 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1] [2018-10-02 11:59:19,909 INFO L423 AbstractCegarLoop]: === Iteration 47 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:59:19,909 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:59:19,909 INFO L82 PathProgramCache]: Analyzing trace with hash -307517692, now seen corresponding path program 46 times [2018-10-02 11:59:19,910 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:59:19,910 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:59:19,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:19,910 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:59:19,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:19,916 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:59:19,917 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:59:19,917 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:59:19,932 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 11:59:22,346 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 11:59:22,346 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:59:22,356 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:59:23,743 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:59:23,765 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:59:23,765 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2018-10-02 11:59:23,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-02 11:59:23,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-02 11:59:23,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=2353, Unknown=0, NotChecked=0, Total=2450 [2018-10-02 11:59:23,766 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 50 states. [2018-10-02 11:59:25,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:59:25,552 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-02 11:59:25,552 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-02 11:59:25,552 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 50 [2018-10-02 11:59:25,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:59:25,553 INFO L225 Difference]: With dead ends: 54 [2018-10-02 11:59:25,553 INFO L226 Difference]: Without dead ends: 52 [2018-10-02 11:59:25,554 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=101, Invalid=2449, Unknown=0, NotChecked=0, Total=2550 [2018-10-02 11:59:25,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-02 11:59:25,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-10-02 11:59:25,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-02 11:59:25,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-10-02 11:59:25,558 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2018-10-02 11:59:25,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:59:25,558 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-10-02 11:59:25,558 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-02 11:59:25,558 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-10-02 11:59:25,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-02 11:59:25,558 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:59:25,558 INFO L375 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1] [2018-10-02 11:59:25,559 INFO L423 AbstractCegarLoop]: === Iteration 48 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:59:25,559 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:59:25,559 INFO L82 PathProgramCache]: Analyzing trace with hash -943115835, now seen corresponding path program 47 times [2018-10-02 11:59:25,559 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:59:25,559 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:59:25,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:25,560 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:59:25,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:25,564 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:59:25,564 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:59:25,564 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:59:25,575 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 11:59:28,206 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2018-10-02 11:59:28,206 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:59:28,217 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:59:29,595 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:59:29,615 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:59:29,615 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2018-10-02 11:59:29,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-02 11:59:29,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-02 11:59:29,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=2451, Unknown=0, NotChecked=0, Total=2550 [2018-10-02 11:59:29,616 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 51 states. [2018-10-02 11:59:31,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:59:31,453 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-10-02 11:59:31,453 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-02 11:59:31,454 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 51 [2018-10-02 11:59:31,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:59:31,454 INFO L225 Difference]: With dead ends: 55 [2018-10-02 11:59:31,454 INFO L226 Difference]: Without dead ends: 53 [2018-10-02 11:59:31,455 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=103, Invalid=2549, Unknown=0, NotChecked=0, Total=2652 [2018-10-02 11:59:31,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-10-02 11:59:31,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-10-02 11:59:31,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-02 11:59:31,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-10-02 11:59:31,460 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2018-10-02 11:59:31,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:59:31,460 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-10-02 11:59:31,460 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-02 11:59:31,461 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-10-02 11:59:31,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-02 11:59:31,461 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:59:31,461 INFO L375 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1] [2018-10-02 11:59:31,461 INFO L423 AbstractCegarLoop]: === Iteration 49 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:59:31,461 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:59:31,462 INFO L82 PathProgramCache]: Analyzing trace with hash 828178212, now seen corresponding path program 48 times [2018-10-02 11:59:31,462 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:59:31,462 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:59:31,462 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:31,462 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:59:31,462 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:31,467 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:59:31,467 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:59:31,467 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:59:31,475 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-02 11:59:34,205 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2018-10-02 11:59:34,206 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:59:34,212 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:59:35,632 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:59:35,651 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:59:35,652 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2018-10-02 11:59:35,652 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-02 11:59:35,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-02 11:59:35,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=2551, Unknown=0, NotChecked=0, Total=2652 [2018-10-02 11:59:35,653 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 52 states. [2018-10-02 11:59:37,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:59:37,580 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2018-10-02 11:59:37,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-02 11:59:37,581 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 52 [2018-10-02 11:59:37,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:59:37,581 INFO L225 Difference]: With dead ends: 56 [2018-10-02 11:59:37,582 INFO L226 Difference]: Without dead ends: 54 [2018-10-02 11:59:37,582 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=105, Invalid=2651, Unknown=0, NotChecked=0, Total=2756 [2018-10-02 11:59:37,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-02 11:59:37,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-10-02 11:59:37,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-02 11:59:37,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-02 11:59:37,586 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2018-10-02 11:59:37,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:59:37,587 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-02 11:59:37,587 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-02 11:59:37,587 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-02 11:59:37,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-02 11:59:37,587 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:59:37,587 INFO L375 BasicCegarLoop]: trace histogram [49, 1, 1, 1, 1] [2018-10-02 11:59:37,587 INFO L423 AbstractCegarLoop]: === Iteration 50 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:59:37,587 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:59:37,588 INFO L82 PathProgramCache]: Analyzing trace with hash -96281179, now seen corresponding path program 49 times [2018-10-02 11:59:37,588 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:59:37,588 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:59:37,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:37,588 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:59:37,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:37,593 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:59:37,593 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:59:37,593 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:59:37,600 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:59:40,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:59:40,172 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:59:42,146 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:59:42,166 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:59:42,166 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2018-10-02 11:59:42,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-02 11:59:42,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-02 11:59:42,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=2653, Unknown=0, NotChecked=0, Total=2756 [2018-10-02 11:59:42,167 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 53 states. [2018-10-02 11:59:44,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:59:44,147 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-02 11:59:44,148 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-02 11:59:44,148 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 53 [2018-10-02 11:59:44,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:59:44,149 INFO L225 Difference]: With dead ends: 57 [2018-10-02 11:59:44,149 INFO L226 Difference]: Without dead ends: 55 [2018-10-02 11:59:44,150 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=107, Invalid=2755, Unknown=0, NotChecked=0, Total=2862 [2018-10-02 11:59:44,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-02 11:59:44,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-10-02 11:59:44,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-10-02 11:59:44,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-10-02 11:59:44,155 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2018-10-02 11:59:44,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:59:44,156 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-10-02 11:59:44,156 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-02 11:59:44,156 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-10-02 11:59:44,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-10-02 11:59:44,156 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:59:44,156 INFO L375 BasicCegarLoop]: trace histogram [50, 1, 1, 1, 1] [2018-10-02 11:59:44,156 INFO L423 AbstractCegarLoop]: === Iteration 51 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:59:44,157 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:59:44,157 INFO L82 PathProgramCache]: Analyzing trace with hash 1310248772, now seen corresponding path program 50 times [2018-10-02 11:59:44,157 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:59:44,157 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:59:44,158 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:44,158 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:59:44,158 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:44,163 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:59:44,164 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:59:44,164 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:59:44,177 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 11:59:46,848 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 11:59:46,848 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:59:46,859 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:59:48,457 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:59:48,478 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:59:48,478 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2018-10-02 11:59:48,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-02 11:59:48,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-02 11:59:48,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=2757, Unknown=0, NotChecked=0, Total=2862 [2018-10-02 11:59:48,479 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 54 states. [2018-10-02 11:59:50,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:59:50,551 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2018-10-02 11:59:50,551 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-10-02 11:59:50,551 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 54 [2018-10-02 11:59:50,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:59:50,552 INFO L225 Difference]: With dead ends: 58 [2018-10-02 11:59:50,552 INFO L226 Difference]: Without dead ends: 56 [2018-10-02 11:59:50,553 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=109, Invalid=2861, Unknown=0, NotChecked=0, Total=2970 [2018-10-02 11:59:50,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-10-02 11:59:50,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2018-10-02 11:59:50,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-02 11:59:50,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-10-02 11:59:50,557 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2018-10-02 11:59:50,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:59:50,557 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-10-02 11:59:50,557 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-02 11:59:50,557 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-10-02 11:59:50,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-02 11:59:50,558 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:59:50,558 INFO L375 BasicCegarLoop]: trace histogram [51, 1, 1, 1, 1] [2018-10-02 11:59:50,558 INFO L423 AbstractCegarLoop]: === Iteration 52 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:59:50,558 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:59:50,558 INFO L82 PathProgramCache]: Analyzing trace with hash 1963004293, now seen corresponding path program 51 times [2018-10-02 11:59:50,558 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:59:50,558 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:59:50,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:50,559 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:59:50,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:50,565 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:59:50,565 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:59:50,566 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:59:50,581 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 11:59:53,845 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-02 11:59:53,845 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:59:53,852 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:59:55,631 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 11:59:55,651 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 11:59:55,651 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2018-10-02 11:59:55,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-02 11:59:55,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-02 11:59:55,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=2863, Unknown=0, NotChecked=0, Total=2970 [2018-10-02 11:59:55,653 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 55 states. [2018-10-02 11:59:57,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:59:57,868 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-10-02 11:59:57,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-02 11:59:57,869 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 55 [2018-10-02 11:59:57,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:59:57,870 INFO L225 Difference]: With dead ends: 59 [2018-10-02 11:59:57,870 INFO L226 Difference]: Without dead ends: 57 [2018-10-02 11:59:57,870 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=111, Invalid=2969, Unknown=0, NotChecked=0, Total=3080 [2018-10-02 11:59:57,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-02 11:59:57,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-10-02 11:59:57,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-02 11:59:57,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-10-02 11:59:57,874 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2018-10-02 11:59:57,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:59:57,874 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-10-02 11:59:57,874 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-02 11:59:57,875 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-10-02 11:59:57,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-02 11:59:57,875 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:59:57,875 INFO L375 BasicCegarLoop]: trace histogram [52, 1, 1, 1, 1] [2018-10-02 11:59:57,875 INFO L423 AbstractCegarLoop]: === Iteration 53 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 11:59:57,875 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:59:57,875 INFO L82 PathProgramCache]: Analyzing trace with hash 723588964, now seen corresponding path program 52 times [2018-10-02 11:59:57,875 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:59:57,876 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:59:57,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:57,876 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:59:57,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:59:57,882 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 11:59:57,883 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 11:59:57,883 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 11:59:57,900 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 12:00:01,103 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 12:00:01,103 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:00:01,115 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:00:02,958 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:00:02,978 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 12:00:02,978 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2018-10-02 12:00:02,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-10-02 12:00:02,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-10-02 12:00:02,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=2971, Unknown=0, NotChecked=0, Total=3080 [2018-10-02 12:00:02,979 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 56 states. [2018-10-02 12:00:05,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:00:05,193 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-02 12:00:05,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-02 12:00:05,193 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 56 [2018-10-02 12:00:05,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:00:05,194 INFO L225 Difference]: With dead ends: 60 [2018-10-02 12:00:05,195 INFO L226 Difference]: Without dead ends: 58 [2018-10-02 12:00:05,195 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=113, Invalid=3079, Unknown=0, NotChecked=0, Total=3192 [2018-10-02 12:00:05,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-02 12:00:05,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-10-02 12:00:05,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-02 12:00:05,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2018-10-02 12:00:05,199 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2018-10-02 12:00:05,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:00:05,199 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2018-10-02 12:00:05,199 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-10-02 12:00:05,200 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2018-10-02 12:00:05,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-02 12:00:05,200 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:00:05,200 INFO L375 BasicCegarLoop]: trace histogram [53, 1, 1, 1, 1] [2018-10-02 12:00:05,200 INFO L423 AbstractCegarLoop]: === Iteration 54 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 12:00:05,200 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 12:00:05,200 INFO L82 PathProgramCache]: Analyzing trace with hash 956419429, now seen corresponding path program 53 times [2018-10-02 12:00:05,200 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:00:05,201 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:00:05,201 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:00:05,201 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:00:05,201 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:00:05,207 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 12:00:05,207 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 12:00:05,207 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 12:00:05,217 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 12:00:09,197 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 28 check-sat command(s) [2018-10-02 12:00:09,198 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:00:09,212 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:00:10,932 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:00:10,952 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 12:00:10,953 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2018-10-02 12:00:10,953 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-02 12:00:10,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-02 12:00:10,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=3081, Unknown=0, NotChecked=0, Total=3192 [2018-10-02 12:00:10,954 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 57 states. [2018-10-02 12:00:13,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:00:13,259 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-10-02 12:00:13,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-10-02 12:00:13,260 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 57 [2018-10-02 12:00:13,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:00:13,260 INFO L225 Difference]: With dead ends: 61 [2018-10-02 12:00:13,261 INFO L226 Difference]: Without dead ends: 59 [2018-10-02 12:00:13,261 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=115, Invalid=3191, Unknown=0, NotChecked=0, Total=3306 [2018-10-02 12:00:13,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-10-02 12:00:13,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-10-02 12:00:13,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-02 12:00:13,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-10-02 12:00:13,265 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2018-10-02 12:00:13,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:00:13,265 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-10-02 12:00:13,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-02 12:00:13,265 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-10-02 12:00:13,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-10-02 12:00:13,266 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:00:13,266 INFO L375 BasicCegarLoop]: trace histogram [54, 1, 1, 1, 1] [2018-10-02 12:00:13,266 INFO L423 AbstractCegarLoop]: === Iteration 55 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 12:00:13,266 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 12:00:13,266 INFO L82 PathProgramCache]: Analyzing trace with hash -415770748, now seen corresponding path program 54 times [2018-10-02 12:00:13,266 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:00:13,266 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:00:13,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:00:13,267 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:00:13,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:00:13,272 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 12:00:13,272 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 12:00:13,272 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 12:00:13,288 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-02 12:00:17,630 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 28 check-sat command(s) [2018-10-02 12:00:17,631 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:00:17,639 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:00:19,433 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:00:19,453 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 12:00:19,453 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2018-10-02 12:00:19,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-10-02 12:00:19,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-10-02 12:00:19,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=3193, Unknown=0, NotChecked=0, Total=3306 [2018-10-02 12:00:19,454 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 58 states. [2018-10-02 12:00:21,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:00:21,839 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2018-10-02 12:00:21,839 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-02 12:00:21,839 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 58 [2018-10-02 12:00:21,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:00:21,840 INFO L225 Difference]: With dead ends: 62 [2018-10-02 12:00:21,840 INFO L226 Difference]: Without dead ends: 60 [2018-10-02 12:00:21,841 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=117, Invalid=3305, Unknown=0, NotChecked=0, Total=3422 [2018-10-02 12:00:21,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-02 12:00:21,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-10-02 12:00:21,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-02 12:00:21,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-10-02 12:00:21,845 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 58 [2018-10-02 12:00:21,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:00:21,845 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-10-02 12:00:21,845 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-10-02 12:00:21,845 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-10-02 12:00:21,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-02 12:00:21,845 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:00:21,845 INFO L375 BasicCegarLoop]: trace histogram [55, 1, 1, 1, 1] [2018-10-02 12:00:21,846 INFO L423 AbstractCegarLoop]: === Iteration 56 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 12:00:21,846 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 12:00:21,846 INFO L82 PathProgramCache]: Analyzing trace with hash -3993275, now seen corresponding path program 55 times [2018-10-02 12:00:21,846 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:00:21,846 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:00:21,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:00:21,847 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:00:21,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:00:21,851 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 12:00:21,851 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 12:00:21,851 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 12:00:21,859 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 12:00:25,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:00:25,498 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:00:27,454 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:00:27,474 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 12:00:27,474 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2018-10-02 12:00:27,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-10-02 12:00:27,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-10-02 12:00:27,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=3307, Unknown=0, NotChecked=0, Total=3422 [2018-10-02 12:00:27,475 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 59 states. [2018-10-02 12:00:29,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:00:29,944 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-02 12:00:29,944 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-02 12:00:29,944 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 59 [2018-10-02 12:00:29,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:00:29,945 INFO L225 Difference]: With dead ends: 63 [2018-10-02 12:00:29,945 INFO L226 Difference]: Without dead ends: 61 [2018-10-02 12:00:29,946 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=119, Invalid=3421, Unknown=0, NotChecked=0, Total=3540 [2018-10-02 12:00:29,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-02 12:00:29,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-10-02 12:00:29,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-10-02 12:00:29,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-10-02 12:00:29,954 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 59 [2018-10-02 12:00:29,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:00:29,954 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-10-02 12:00:29,954 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-10-02 12:00:29,954 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-10-02 12:00:29,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-10-02 12:00:29,954 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:00:29,955 INFO L375 BasicCegarLoop]: trace histogram [56, 1, 1, 1, 1] [2018-10-02 12:00:29,955 INFO L423 AbstractCegarLoop]: === Iteration 57 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 12:00:29,955 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 12:00:29,955 INFO L82 PathProgramCache]: Analyzing trace with hash -123793500, now seen corresponding path program 56 times [2018-10-02 12:00:29,955 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:00:29,955 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:00:29,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:00:29,956 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 12:00:29,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:00:29,961 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 12:00:29,962 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 12:00:29,962 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 12:00:29,974 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 12:00:33,812 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 12:00:33,812 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:00:33,826 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:00:35,785 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:00:35,805 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 12:00:35,805 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2018-10-02 12:00:35,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-02 12:00:35,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-02 12:00:35,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=3423, Unknown=0, NotChecked=0, Total=3540 [2018-10-02 12:00:35,806 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 60 states. [2018-10-02 12:00:38,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:00:38,354 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2018-10-02 12:00:38,354 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-10-02 12:00:38,354 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 60 [2018-10-02 12:00:38,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:00:38,355 INFO L225 Difference]: With dead ends: 64 [2018-10-02 12:00:38,355 INFO L226 Difference]: Without dead ends: 62 [2018-10-02 12:00:38,356 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=121, Invalid=3539, Unknown=0, NotChecked=0, Total=3660 [2018-10-02 12:00:38,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-10-02 12:00:38,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2018-10-02 12:00:38,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-10-02 12:00:38,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2018-10-02 12:00:38,361 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 60 [2018-10-02 12:00:38,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:00:38,362 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2018-10-02 12:00:38,362 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-02 12:00:38,362 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2018-10-02 12:00:38,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-02 12:00:38,362 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:00:38,362 INFO L375 BasicCegarLoop]: trace histogram [57, 1, 1, 1, 1] [2018-10-02 12:00:38,363 INFO L423 AbstractCegarLoop]: === Iteration 58 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 12:00:38,363 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 12:00:38,363 INFO L82 PathProgramCache]: Analyzing trace with hash 457366821, now seen corresponding path program 57 times [2018-10-02 12:00:38,363 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:00:38,363 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:00:38,363 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:00:38,364 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:00:38,364 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:00:38,370 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 12:00:38,370 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 12:00:38,370 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 12:00:38,387 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 12:00:43,470 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-02 12:00:43,470 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:00:43,478 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:00:45,689 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:00:45,709 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 12:00:45,709 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2018-10-02 12:00:45,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-10-02 12:00:45,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-10-02 12:00:45,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=3541, Unknown=0, NotChecked=0, Total=3660 [2018-10-02 12:00:45,710 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand 61 states. [2018-10-02 12:00:48,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:00:48,350 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2018-10-02 12:00:48,351 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-02 12:00:48,351 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 61 [2018-10-02 12:00:48,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:00:48,352 INFO L225 Difference]: With dead ends: 65 [2018-10-02 12:00:48,352 INFO L226 Difference]: Without dead ends: 63 [2018-10-02 12:00:48,352 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=123, Invalid=3659, Unknown=0, NotChecked=0, Total=3782 [2018-10-02 12:00:48,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-02 12:00:48,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-10-02 12:00:48,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-02 12:00:48,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-10-02 12:00:48,357 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 61 [2018-10-02 12:00:48,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:00:48,357 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-10-02 12:00:48,358 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-10-02 12:00:48,358 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-10-02 12:00:48,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-02 12:00:48,358 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:00:48,358 INFO L375 BasicCegarLoop]: trace histogram [58, 1, 1, 1, 1] [2018-10-02 12:00:48,359 INFO L423 AbstractCegarLoop]: === Iteration 59 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 12:00:48,359 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 12:00:48,359 INFO L82 PathProgramCache]: Analyzing trace with hash 1293467588, now seen corresponding path program 58 times [2018-10-02 12:00:48,359 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:00:48,359 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:00:48,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:00:48,360 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:00:48,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:00:48,366 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 12:00:48,366 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 12:00:48,366 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 12:00:48,377 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 12:00:53,042 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 12:00:53,043 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:00:53,059 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:00:55,116 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:00:55,136 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 12:00:55,137 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2018-10-02 12:00:55,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-10-02 12:00:55,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-10-02 12:00:55,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=3661, Unknown=0, NotChecked=0, Total=3782 [2018-10-02 12:00:55,138 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 62 states. [2018-10-02 12:00:57,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:00:57,859 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-02 12:00:57,860 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-10-02 12:00:57,860 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 62 [2018-10-02 12:00:57,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:00:57,861 INFO L225 Difference]: With dead ends: 66 [2018-10-02 12:00:57,861 INFO L226 Difference]: Without dead ends: 64 [2018-10-02 12:00:57,861 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=125, Invalid=3781, Unknown=0, NotChecked=0, Total=3906 [2018-10-02 12:00:57,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-02 12:00:57,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2018-10-02 12:00:57,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-10-02 12:00:57,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 64 transitions. [2018-10-02 12:00:57,867 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 64 transitions. Word has length 62 [2018-10-02 12:00:57,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:00:57,867 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 64 transitions. [2018-10-02 12:00:57,867 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-10-02 12:00:57,867 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 64 transitions. [2018-10-02 12:00:57,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-10-02 12:00:57,867 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:00:57,867 INFO L375 BasicCegarLoop]: trace histogram [59, 1, 1, 1, 1] [2018-10-02 12:00:57,868 INFO L423 AbstractCegarLoop]: === Iteration 60 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 12:00:57,868 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 12:00:57,868 INFO L82 PathProgramCache]: Analyzing trace with hash 1442787589, now seen corresponding path program 59 times [2018-10-02 12:00:57,868 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:00:57,868 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:00:57,869 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:00:57,869 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:00:57,869 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:00:57,876 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 12:00:57,876 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 12:00:57,876 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 12:00:57,893 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 12:01:03,920 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 31 check-sat command(s) [2018-10-02 12:01:03,920 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:01:03,937 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:01:05,984 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:01:06,004 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 12:01:06,004 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62] total 62 [2018-10-02 12:01:06,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-10-02 12:01:06,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-10-02 12:01:06,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=3783, Unknown=0, NotChecked=0, Total=3906 [2018-10-02 12:01:06,006 INFO L87 Difference]: Start difference. First operand 64 states and 64 transitions. Second operand 63 states. [2018-10-02 12:01:08,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:01:08,827 INFO L93 Difference]: Finished difference Result 67 states and 67 transitions. [2018-10-02 12:01:08,827 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-02 12:01:08,827 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 63 [2018-10-02 12:01:08,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:01:08,828 INFO L225 Difference]: With dead ends: 67 [2018-10-02 12:01:08,828 INFO L226 Difference]: Without dead ends: 65 [2018-10-02 12:01:08,828 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=127, Invalid=3905, Unknown=0, NotChecked=0, Total=4032 [2018-10-02 12:01:08,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-10-02 12:01:08,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2018-10-02 12:01:08,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-10-02 12:01:08,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2018-10-02 12:01:08,833 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 63 [2018-10-02 12:01:08,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:01:08,833 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2018-10-02 12:01:08,833 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-10-02 12:01:08,833 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2018-10-02 12:01:08,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-02 12:01:08,833 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:01:08,833 INFO L375 BasicCegarLoop]: trace histogram [60, 1, 1, 1, 1] [2018-10-02 12:01:08,834 INFO L423 AbstractCegarLoop]: === Iteration 61 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 12:01:08,834 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 12:01:08,834 INFO L82 PathProgramCache]: Analyzing trace with hash 1776740324, now seen corresponding path program 60 times [2018-10-02 12:01:08,834 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:01:08,834 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:01:08,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:01:08,835 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:01:08,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:01:08,841 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 12:01:08,842 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 12:01:08,842 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 12:01:08,863 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-02 12:01:15,044 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2018-10-02 12:01:15,045 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:01:15,054 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:01:17,150 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 0 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:01:17,170 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 12:01:17,170 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63] total 63 [2018-10-02 12:01:17,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-10-02 12:01:17,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-10-02 12:01:17,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=3907, Unknown=0, NotChecked=0, Total=4032 [2018-10-02 12:01:17,171 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 64 states. [2018-10-02 12:01:20,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:01:20,070 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2018-10-02 12:01:20,070 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-10-02 12:01:20,071 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 64 [2018-10-02 12:01:20,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:01:20,071 INFO L225 Difference]: With dead ends: 68 [2018-10-02 12:01:20,071 INFO L226 Difference]: Without dead ends: 66 [2018-10-02 12:01:20,072 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=129, Invalid=4031, Unknown=0, NotChecked=0, Total=4160 [2018-10-02 12:01:20,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-02 12:01:20,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-10-02 12:01:20,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-02 12:01:20,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-10-02 12:01:20,077 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 64 [2018-10-02 12:01:20,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:01:20,077 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-10-02 12:01:20,077 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-10-02 12:01:20,077 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-10-02 12:01:20,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-02 12:01:20,077 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:01:20,077 INFO L375 BasicCegarLoop]: trace histogram [61, 1, 1, 1, 1] [2018-10-02 12:01:20,078 INFO L423 AbstractCegarLoop]: === Iteration 62 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 12:01:20,078 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 12:01:20,078 INFO L82 PathProgramCache]: Analyzing trace with hash -755626779, now seen corresponding path program 61 times [2018-10-02 12:01:20,078 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:01:20,078 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:01:20,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:01:20,078 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:01:20,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:01:20,086 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 12:01:20,086 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 12:01:20,086 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 12:01:20,100 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 12:01:25,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:01:25,801 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:01:27,971 INFO L134 CoverageAnalysis]: Checked inductivity of 1891 backedges. 0 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:01:27,992 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 12:01:27,992 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64] total 64 [2018-10-02 12:01:27,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-10-02 12:01:27,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-10-02 12:01:27,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=4033, Unknown=0, NotChecked=0, Total=4160 [2018-10-02 12:01:27,993 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 65 states. [2018-10-02 12:01:30,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:01:30,986 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-02 12:01:30,986 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-02 12:01:30,987 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 65 [2018-10-02 12:01:30,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:01:30,987 INFO L225 Difference]: With dead ends: 69 [2018-10-02 12:01:30,988 INFO L226 Difference]: Without dead ends: 67 [2018-10-02 12:01:30,988 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=131, Invalid=4159, Unknown=0, NotChecked=0, Total=4290 [2018-10-02 12:01:30,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-02 12:01:30,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-10-02 12:01:30,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-10-02 12:01:30,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2018-10-02 12:01:30,993 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 65 [2018-10-02 12:01:30,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:01:30,993 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2018-10-02 12:01:30,993 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-10-02 12:01:30,993 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2018-10-02 12:01:30,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-10-02 12:01:30,994 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:01:30,994 INFO L375 BasicCegarLoop]: trace histogram [62, 1, 1, 1, 1] [2018-10-02 12:01:30,994 INFO L423 AbstractCegarLoop]: === Iteration 63 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 12:01:30,994 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 12:01:30,994 INFO L82 PathProgramCache]: Analyzing trace with hash -1949595644, now seen corresponding path program 62 times [2018-10-02 12:01:30,994 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:01:30,994 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:01:30,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:01:30,995 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 12:01:30,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:01:31,001 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 12:01:31,001 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 12:01:31,001 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 12:01:31,023 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 12:01:37,006 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 12:01:37,007 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:01:37,025 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:01:39,241 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:01:39,262 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 12:01:39,262 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65] total 65 [2018-10-02 12:01:39,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-10-02 12:01:39,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-10-02 12:01:39,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=4161, Unknown=0, NotChecked=0, Total=4290 [2018-10-02 12:01:39,263 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 66 states. [2018-10-02 12:01:42,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:01:42,332 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2018-10-02 12:01:42,332 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-10-02 12:01:42,332 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 66 [2018-10-02 12:01:42,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:01:42,333 INFO L225 Difference]: With dead ends: 70 [2018-10-02 12:01:42,333 INFO L226 Difference]: Without dead ends: 68 [2018-10-02 12:01:42,334 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=133, Invalid=4289, Unknown=0, NotChecked=0, Total=4422 [2018-10-02 12:01:42,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-10-02 12:01:42,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2018-10-02 12:01:42,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-10-02 12:01:42,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2018-10-02 12:01:42,338 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 66 [2018-10-02 12:01:42,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:01:42,338 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2018-10-02 12:01:42,339 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-10-02 12:01:42,339 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2018-10-02 12:01:42,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-02 12:01:42,339 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:01:42,339 INFO L375 BasicCegarLoop]: trace histogram [63, 1, 1, 1, 1] [2018-10-02 12:01:42,339 INFO L423 AbstractCegarLoop]: === Iteration 64 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 12:01:42,340 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 12:01:42,340 INFO L82 PathProgramCache]: Analyzing trace with hash -307924795, now seen corresponding path program 63 times [2018-10-02 12:01:42,340 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:01:42,340 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:01:42,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:01:42,341 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:01:42,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:01:42,347 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 12:01:42,347 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 12:01:42,347 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 12:01:42,363 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 12:01:50,248 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-10-02 12:01:50,248 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:01:50,257 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:01:52,663 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:01:52,684 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 12:01:52,684 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66] total 66 [2018-10-02 12:01:52,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-10-02 12:01:52,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-10-02 12:01:52,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=4291, Unknown=0, NotChecked=0, Total=4422 [2018-10-02 12:01:52,685 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand 67 states. [2018-10-02 12:01:55,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:01:55,845 INFO L93 Difference]: Finished difference Result 71 states and 71 transitions. [2018-10-02 12:01:55,846 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-02 12:01:55,846 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 67 [2018-10-02 12:01:55,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:01:55,847 INFO L225 Difference]: With dead ends: 71 [2018-10-02 12:01:55,847 INFO L226 Difference]: Without dead ends: 69 [2018-10-02 12:01:55,848 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=135, Invalid=4421, Unknown=0, NotChecked=0, Total=4556 [2018-10-02 12:01:55,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-02 12:01:55,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-10-02 12:01:55,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-02 12:01:55,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-10-02 12:01:55,853 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 67 [2018-10-02 12:01:55,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:01:55,854 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-10-02 12:01:55,854 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-10-02 12:01:55,854 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-10-02 12:01:55,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-02 12:01:55,854 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:01:55,855 INFO L375 BasicCegarLoop]: trace histogram [64, 1, 1, 1, 1] [2018-10-02 12:01:55,855 INFO L423 AbstractCegarLoop]: === Iteration 65 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 12:01:55,855 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 12:01:55,855 INFO L82 PathProgramCache]: Analyzing trace with hash -955736028, now seen corresponding path program 64 times [2018-10-02 12:01:55,855 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:01:55,855 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:01:55,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:01:55,856 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:01:55,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:01:55,862 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 12:01:55,863 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 12:01:55,863 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 12:01:55,872 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 12:02:02,809 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 12:02:02,809 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:02:02,830 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:02:06,496 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 0 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:02:06,517 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-02 12:02:06,517 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67] total 67 [2018-10-02 12:02:06,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-10-02 12:02:06,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-10-02 12:02:06,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=4423, Unknown=0, NotChecked=0, Total=4556 [2018-10-02 12:02:06,518 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 68 states. [2018-10-02 12:02:09,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:02:09,780 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-10-02 12:02:09,781 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-10-02 12:02:09,781 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 68 [2018-10-02 12:02:09,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:02:09,782 INFO L225 Difference]: With dead ends: 72 [2018-10-02 12:02:09,782 INFO L226 Difference]: Without dead ends: 70 [2018-10-02 12:02:09,782 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=137, Invalid=4555, Unknown=0, NotChecked=0, Total=4692 [2018-10-02 12:02:09,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-02 12:02:09,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-10-02 12:02:09,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-10-02 12:02:09,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2018-10-02 12:02:09,787 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 68 [2018-10-02 12:02:09,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:02:09,787 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2018-10-02 12:02:09,788 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-10-02 12:02:09,788 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2018-10-02 12:02:09,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-02 12:02:09,788 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:02:09,788 INFO L375 BasicCegarLoop]: trace histogram [65, 1, 1, 1, 1] [2018-10-02 12:02:09,788 INFO L423 AbstractCegarLoop]: === Iteration 66 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-10-02 12:02:09,788 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 12:02:09,789 INFO L82 PathProgramCache]: Analyzing trace with hash 436952229, now seen corresponding path program 65 times [2018-10-02 12:02:09,789 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:02:09,789 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:02:09,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:02:09,789 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:02:09,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:02:09,796 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-02 12:02:09,796 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-02 12:02:09,796 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-02 12:02:09,810 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown