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 0.1.23-1cc990c [2018-09-30 20:28:54,117 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-30 20:28:54,119 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-30 20:28:54,132 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-30 20:28:54,132 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-30 20:28:54,133 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-30 20:28:54,134 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-30 20:28:54,136 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-30 20:28:54,138 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-30 20:28:54,139 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-30 20:28:54,140 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-30 20:28:54,140 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-30 20:28:54,141 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-30 20:28:54,142 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-30 20:28:54,143 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-30 20:28:54,144 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-30 20:28:54,145 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-30 20:28:54,147 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-30 20:28:54,149 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-30 20:28:54,150 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-30 20:28:54,151 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-30 20:28:54,153 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-30 20:28:54,155 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-09-30 20:28:54,174 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf [2018-09-30 20:28:54,202 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-30 20:28:54,202 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-30 20:28:54,203 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-30 20:28:54,204 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-09-30 20:28:54,204 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-09-30 20:28:54,205 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-09-30 20:28:54,206 INFO L133 SettingsManager]: * Use SBE=true [2018-09-30 20:28:54,206 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-30 20:28:54,206 INFO L133 SettingsManager]: * sizeof long=4 [2018-09-30 20:28:54,206 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-30 20:28:54,206 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-09-30 20:28:54,207 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-30 20:28:54,207 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-30 20:28:54,207 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-30 20:28:54,207 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-30 20:28:54,208 INFO L133 SettingsManager]: * sizeof long double=12 [2018-09-30 20:28:54,208 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-30 20:28:54,208 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-30 20:28:54,208 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-30 20:28:54,208 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-30 20:28:54,209 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-30 20:28:54,209 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-30 20:28:54,209 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-30 20:28:54,209 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-30 20:28:54,211 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-30 20:28:54,211 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-30 20:28:54,211 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-09-30 20:28:54,211 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-30 20:28:54,211 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-30 20:28:54,212 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-30 20:28:54,269 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-30 20:28:54,284 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-30 20:28:54,291 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-30 20:28:54,293 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-30 20:28:54,293 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-30 20:28:54,294 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/nonlinear/Mult1-Safe.bpl [2018-09-30 20:28:54,295 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/nonlinear/Mult1-Safe.bpl' [2018-09-30 20:28:54,347 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-30 20:28:54,350 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-30 20:28:54,351 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-30 20:28:54,351 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-30 20:28:54,352 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-30 20:28:54,374 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:28:54" (1/1) ... [2018-09-30 20:28:54,388 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:28:54" (1/1) ... [2018-09-30 20:28:54,392 WARN L165 Inliner]: Program contained no entry procedure! [2018-09-30 20:28:54,393 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2018-09-30 20:28:54,393 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2018-09-30 20:28:54,396 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-30 20:28:54,397 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-30 20:28:54,397 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-30 20:28:54,397 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-30 20:28:54,408 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:28:54" (1/1) ... [2018-09-30 20:28:54,409 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:28:54" (1/1) ... [2018-09-30 20:28:54,409 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:28:54" (1/1) ... [2018-09-30 20:28:54,410 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:28:54" (1/1) ... [2018-09-30 20:28:54,413 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:28:54" (1/1) ... [2018-09-30 20:28:54,418 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:28:54" (1/1) ... [2018-09-30 20:28:54,419 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:28:54" (1/1) ... [2018-09-30 20:28:54,421 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-30 20:28:54,422 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-30 20:28:54,422 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-30 20:28:54,422 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-30 20:28:54,424 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:28:54" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-30 20:28:54,499 INFO L124 BoogieDeclarations]: Specification and implementation of procedure mult given in one single declaration [2018-09-30 20:28:54,500 INFO L130 BoogieDeclarations]: Found specification of procedure mult [2018-09-30 20:28:54,500 INFO L138 BoogieDeclarations]: Found implementation of procedure mult [2018-09-30 20:28:54,570 WARN L639 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2018-09-30 20:28:54,723 INFO L345 CfgBuilder]: Using library mode [2018-09-30 20:28:54,724 INFO L202 PluginConnector]: Adding new model Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.09 08:28:54 BoogieIcfgContainer [2018-09-30 20:28:54,724 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-30 20:28:54,728 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-30 20:28:54,728 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-30 20:28:54,735 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-30 20:28:54,736 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:28:54" (1/2) ... [2018-09-30 20:28:54,737 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56cb4383 and model type Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.09 08:28:54, skipping insertion in model container [2018-09-30 20:28:54,737 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.09 08:28:54" (2/2) ... [2018-09-30 20:28:54,739 INFO L112 eAbstractionObserver]: Analyzing ICFG Mult1-Safe.bpl [2018-09-30 20:28:54,749 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-30 20:28:54,757 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-30 20:28:54,805 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-30 20:28:54,806 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-30 20:28:54,806 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-30 20:28:54,806 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-30 20:28:54,806 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-30 20:28:54,807 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-30 20:28:54,807 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-30 20:28:54,807 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-30 20:28:54,807 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-30 20:28:54,823 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-09-30 20:28:54,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-09-30 20:28:54,829 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:28:54,831 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-09-30 20:28:54,832 INFO L423 AbstractCegarLoop]: === Iteration 1 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:28:54,838 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:28:54,838 INFO L82 PathProgramCache]: Analyzing trace with hash 924708, now seen corresponding path program 1 times [2018-09-30 20:28:54,841 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:28:54,841 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:28:54,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:54,899 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:28:54,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:54,934 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:28:54,935 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:28:54,935 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 [2018-09-30 20:28:54,954 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:28:54,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:28:54,981 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:28:55,150 WARN L178 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-09-30 20:28:55,232 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:28:55,255 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-30 20:28:55,256 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-09-30 20:28:55,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-30 20:28:55,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-30 20:28:55,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-09-30 20:28:55,279 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 5 states. [2018-09-30 20:28:55,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:28:55,400 INFO L93 Difference]: Finished difference Result 10 states and 10 transitions. [2018-09-30 20:28:55,401 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-30 20:28:55,403 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 4 [2018-09-30 20:28:55,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:28:55,415 INFO L225 Difference]: With dead ends: 10 [2018-09-30 20:28:55,415 INFO L226 Difference]: Without dead ends: 6 [2018-09-30 20:28:55,419 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 [2018-09-30 20:28:55,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2018-09-30 20:28:55,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2018-09-30 20:28:55,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2018-09-30 20:28:55,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2018-09-30 20:28:55,456 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2018-09-30 20:28:55,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:28:55,456 INFO L480 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2018-09-30 20:28:55,456 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-30 20:28:55,457 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2018-09-30 20:28:55,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-09-30 20:28:55,457 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:28:55,457 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2018-09-30 20:28:55,458 INFO L423 AbstractCegarLoop]: === Iteration 2 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:28:55,458 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:28:55,458 INFO L82 PathProgramCache]: Analyzing trace with hash 28663973, now seen corresponding path program 1 times [2018-09-30 20:28:55,458 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:28:55,459 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:28:55,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:55,460 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:28:55,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:55,465 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:28:55,465 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:28:55,465 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-30 20:28:55,482 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:28:55,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:28:55,493 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:28:55,579 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:28:55,601 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:28:55,602 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2018-09-30 20:28:55,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-30 20:28:55,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-30 20:28:55,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-09-30 20:28:55,604 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand 5 states. [2018-09-30 20:28:55,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:28:55,722 INFO L93 Difference]: Finished difference Result 9 states and 9 transitions. [2018-09-30 20:28:55,723 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-30 20:28:55,724 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 5 [2018-09-30 20:28:55,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:28:55,724 INFO L225 Difference]: With dead ends: 9 [2018-09-30 20:28:55,724 INFO L226 Difference]: Without dead ends: 7 [2018-09-30 20:28:55,726 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 [2018-09-30 20:28:55,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-09-30 20:28:55,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-09-30 20:28:55,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-09-30 20:28:55,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-09-30 20:28:55,731 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 5 [2018-09-30 20:28:55,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:28:55,731 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-09-30 20:28:55,732 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-30 20:28:55,732 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-09-30 20:28:55,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-09-30 20:28:55,732 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:28:55,732 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-09-30 20:28:55,733 INFO L423 AbstractCegarLoop]: === Iteration 3 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:28:55,733 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:28:55,733 INFO L82 PathProgramCache]: Analyzing trace with hash 888581188, now seen corresponding path program 2 times [2018-09-30 20:28:55,733 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:28:55,734 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:28:55,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:55,735 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:28:55,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:55,743 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:28:55,744 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:28:55,744 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 [2018-09-30 20:28:55,766 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:28:55,781 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:28:55,781 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:28:55,783 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:28:56,182 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:28:56,202 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:28:56,202 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2018-09-30 20:28:56,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-30 20:28:56,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-30 20:28:56,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-30 20:28:56,203 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 6 states. [2018-09-30 20:28:56,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:28:56,283 INFO L93 Difference]: Finished difference Result 10 states and 10 transitions. [2018-09-30 20:28:56,283 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-30 20:28:56,284 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2018-09-30 20:28:56,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:28:56,285 INFO L225 Difference]: With dead ends: 10 [2018-09-30 20:28:56,285 INFO L226 Difference]: Without dead ends: 8 [2018-09-30 20:28:56,286 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-09-30 20:28:56,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-09-30 20:28:56,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-09-30 20:28:56,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-09-30 20:28:56,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-09-30 20:28:56,290 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2018-09-30 20:28:56,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:28:56,291 INFO L480 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-09-30 20:28:56,291 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-30 20:28:56,291 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-09-30 20:28:56,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-09-30 20:28:56,292 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:28:56,292 INFO L375 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1] [2018-09-30 20:28:56,292 INFO L423 AbstractCegarLoop]: === Iteration 4 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:28:56,293 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:28:56,293 INFO L82 PathProgramCache]: Analyzing trace with hash 1776211077, now seen corresponding path program 3 times [2018-09-30 20:28:56,293 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:28:56,293 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:28:56,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:56,295 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:28:56,295 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:56,302 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:28:56,302 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:28:56,302 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 [2018-09-30 20:28:56,318 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:28:56,334 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-09-30 20:28:56,335 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:28:56,336 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:28:56,557 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:28:56,583 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:28:56,583 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2018-09-30 20:28:56,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-30 20:28:56,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-30 20:28:56,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-09-30 20:28:56,584 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 7 states. [2018-09-30 20:28:56,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:28:56,672 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-09-30 20:28:56,672 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-30 20:28:56,672 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2018-09-30 20:28:56,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:28:56,673 INFO L225 Difference]: With dead ends: 11 [2018-09-30 20:28:56,673 INFO L226 Difference]: Without dead ends: 9 [2018-09-30 20:28:56,674 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 [2018-09-30 20:28:56,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-09-30 20:28:56,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-09-30 20:28:56,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-09-30 20:28:56,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-09-30 20:28:56,682 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2018-09-30 20:28:56,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:28:56,682 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-09-30 20:28:56,682 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-30 20:28:56,682 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-09-30 20:28:56,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-09-30 20:28:56,683 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:28:56,683 INFO L375 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2018-09-30 20:28:56,683 INFO L423 AbstractCegarLoop]: === Iteration 5 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:28:56,684 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:28:56,684 INFO L82 PathProgramCache]: Analyzing trace with hash -772033436, now seen corresponding path program 4 times [2018-09-30 20:28:56,684 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:28:56,684 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:28:56,685 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:56,685 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:28:56,685 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:56,693 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:28:56,693 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:28:56,693 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-30 20:28:56,706 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:28:56,715 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:28:56,715 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:28:56,717 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:28:57,133 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:28:57,153 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:28:57,153 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2018-09-30 20:28:57,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-30 20:28:57,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-30 20:28:57,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-09-30 20:28:57,154 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 8 states. [2018-09-30 20:28:57,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:28:57,280 INFO L93 Difference]: Finished difference Result 12 states and 12 transitions. [2018-09-30 20:28:57,280 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-30 20:28:57,280 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 8 [2018-09-30 20:28:57,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:28:57,281 INFO L225 Difference]: With dead ends: 12 [2018-09-30 20:28:57,281 INFO L226 Difference]: Without dead ends: 10 [2018-09-30 20:28:57,282 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 [2018-09-30 20:28:57,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-09-30 20:28:57,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-09-30 20:28:57,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-09-30 20:28:57,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-09-30 20:28:57,286 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 8 [2018-09-30 20:28:57,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:28:57,288 INFO L480 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2018-09-30 20:28:57,288 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-30 20:28:57,288 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2018-09-30 20:28:57,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-09-30 20:28:57,288 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:28:57,288 INFO L375 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1] [2018-09-30 20:28:57,289 INFO L423 AbstractCegarLoop]: === Iteration 6 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:28:57,289 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:28:57,289 INFO L82 PathProgramCache]: Analyzing trace with hash 1836765285, now seen corresponding path program 5 times [2018-09-30 20:28:57,289 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:28:57,289 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:28:57,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:57,290 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:28:57,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:57,304 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:28:57,304 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:28:57,304 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 [2018-09-30 20:28:57,313 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:28:57,326 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2018-09-30 20:28:57,326 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:28:57,328 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:28:57,458 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:28:57,479 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:28:57,480 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2018-09-30 20:28:57,480 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-30 20:28:57,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-30 20:28:57,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-09-30 20:28:57,483 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 9 states. [2018-09-30 20:28:57,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:28:57,630 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-09-30 20:28:57,632 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-30 20:28:57,632 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 9 [2018-09-30 20:28:57,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:28:57,633 INFO L225 Difference]: With dead ends: 13 [2018-09-30 20:28:57,633 INFO L226 Difference]: Without dead ends: 11 [2018-09-30 20:28:57,633 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 [2018-09-30 20:28:57,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-30 20:28:57,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-09-30 20:28:57,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-09-30 20:28:57,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-09-30 20:28:57,637 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2018-09-30 20:28:57,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:28:57,637 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-09-30 20:28:57,638 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-30 20:28:57,638 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-09-30 20:28:57,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-30 20:28:57,638 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:28:57,639 INFO L375 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1] [2018-09-30 20:28:57,639 INFO L423 AbstractCegarLoop]: === Iteration 7 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:28:57,639 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:28:57,639 INFO L82 PathProgramCache]: Analyzing trace with hash 1105147012, now seen corresponding path program 6 times [2018-09-30 20:28:57,639 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:28:57,639 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:28:57,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:57,641 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:28:57,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:57,648 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:28:57,649 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:28:57,649 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 [2018-09-30 20:28:57,659 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:28:57,677 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2018-09-30 20:28:57,677 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:28:57,680 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:28:57,844 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:28:57,866 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:28:57,866 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2018-09-30 20:28:57,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-30 20:28:57,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-30 20:28:57,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-09-30 20:28:57,867 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 10 states. [2018-09-30 20:28:58,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:28:58,057 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2018-09-30 20:28:58,057 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-30 20:28:58,057 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 10 [2018-09-30 20:28:58,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:28:58,058 INFO L225 Difference]: With dead ends: 14 [2018-09-30 20:28:58,058 INFO L226 Difference]: Without dead ends: 12 [2018-09-30 20:28:58,058 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 [2018-09-30 20:28:58,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-09-30 20:28:58,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-09-30 20:28:58,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-09-30 20:28:58,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-09-30 20:28:58,063 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-09-30 20:28:58,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:28:58,063 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-09-30 20:28:58,063 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-30 20:28:58,063 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-09-30 20:28:58,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-09-30 20:28:58,064 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:28:58,064 INFO L375 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1] [2018-09-30 20:28:58,064 INFO L423 AbstractCegarLoop]: === Iteration 8 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:28:58,065 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:28:58,065 INFO L82 PathProgramCache]: Analyzing trace with hash -100182971, now seen corresponding path program 7 times [2018-09-30 20:28:58,065 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:28:58,065 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:28:58,066 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:58,066 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:28:58,066 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:58,074 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:28:58,074 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:28:58,075 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 [2018-09-30 20:28:58,083 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:28:58,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:28:58,102 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:28:58,286 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:28:58,307 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:28:58,308 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2018-09-30 20:28:58,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-30 20:28:58,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-30 20:28:58,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-09-30 20:28:58,309 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 11 states. [2018-09-30 20:28:58,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:28:58,424 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-09-30 20:28:58,424 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-30 20:28:58,424 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 11 [2018-09-30 20:28:58,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:28:58,425 INFO L225 Difference]: With dead ends: 15 [2018-09-30 20:28:58,426 INFO L226 Difference]: Without dead ends: 13 [2018-09-30 20:28:58,426 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 [2018-09-30 20:28:58,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-09-30 20:28:58,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-09-30 20:28:58,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-09-30 20:28:58,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-09-30 20:28:58,431 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2018-09-30 20:28:58,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:28:58,431 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-09-30 20:28:58,431 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-30 20:28:58,431 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-09-30 20:28:58,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-09-30 20:28:58,432 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:28:58,432 INFO L375 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1] [2018-09-30 20:28:58,432 INFO L423 AbstractCegarLoop]: === Iteration 9 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:28:58,432 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:28:58,432 INFO L82 PathProgramCache]: Analyzing trace with hash 1189293220, now seen corresponding path program 8 times [2018-09-30 20:28:58,433 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:28:58,433 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:28:58,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:58,434 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:28:58,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:58,443 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:28:58,444 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:28:58,444 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 [2018-09-30 20:28:58,460 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:28:58,483 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:28:58,483 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:28:58,487 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:28:58,636 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:28:58,657 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:28:58,658 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2018-09-30 20:28:58,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-30 20:28:58,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-30 20:28:58,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-09-30 20:28:58,659 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 12 states. [2018-09-30 20:28:58,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:28:58,796 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-09-30 20:28:58,797 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-30 20:28:58,797 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 12 [2018-09-30 20:28:58,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:28:58,798 INFO L225 Difference]: With dead ends: 16 [2018-09-30 20:28:58,798 INFO L226 Difference]: Without dead ends: 14 [2018-09-30 20:28:58,799 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 [2018-09-30 20:28:58,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-09-30 20:28:58,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-09-30 20:28:58,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-09-30 20:28:58,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-09-30 20:28:58,804 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2018-09-30 20:28:58,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:28:58,804 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-09-30 20:28:58,804 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-30 20:28:58,804 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-09-30 20:28:58,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-09-30 20:28:58,805 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:28:58,805 INFO L375 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1] [2018-09-30 20:28:58,805 INFO L423 AbstractCegarLoop]: === Iteration 10 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:28:58,805 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:28:58,805 INFO L82 PathProgramCache]: Analyzing trace with hash -1786617819, now seen corresponding path program 9 times [2018-09-30 20:28:58,805 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:28:58,806 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:28:58,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:58,807 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:28:58,807 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:58,816 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:28:58,817 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:28:58,817 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 [2018-09-30 20:28:58,826 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:28:58,848 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-09-30 20:28:58,848 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:28:58,850 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:28:59,121 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:28:59,149 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:28:59,149 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2018-09-30 20:28:59,149 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-30 20:28:59,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-30 20:28:59,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-09-30 20:28:59,150 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 13 states. [2018-09-30 20:28:59,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:28:59,373 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-09-30 20:28:59,374 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-30 20:28:59,374 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 13 [2018-09-30 20:28:59,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:28:59,375 INFO L225 Difference]: With dead ends: 17 [2018-09-30 20:28:59,375 INFO L226 Difference]: Without dead ends: 15 [2018-09-30 20:28:59,376 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2018-09-30 20:28:59,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-09-30 20:28:59,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-09-30 20:28:59,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-09-30 20:28:59,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-09-30 20:28:59,381 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2018-09-30 20:28:59,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:28:59,381 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-09-30 20:28:59,381 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-30 20:28:59,381 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-09-30 20:28:59,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-30 20:28:59,382 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:28:59,382 INFO L375 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1] [2018-09-30 20:28:59,382 INFO L423 AbstractCegarLoop]: === Iteration 11 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:28:59,382 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:28:59,383 INFO L82 PathProgramCache]: Analyzing trace with hash 449420484, now seen corresponding path program 10 times [2018-09-30 20:28:59,383 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:28:59,383 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:28:59,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:59,384 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:28:59,384 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:59,393 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:28:59,393 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:28:59,393 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 [2018-09-30 20:28:59,404 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:28:59,430 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:28:59,430 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:28:59,432 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:28:59,756 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:28:59,780 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:28:59,780 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2018-09-30 20:28:59,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-30 20:28:59,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-30 20:28:59,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-09-30 20:28:59,781 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 14 states. [2018-09-30 20:28:59,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:28:59,969 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2018-09-30 20:28:59,969 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-30 20:28:59,969 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 14 [2018-09-30 20:28:59,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:28:59,970 INFO L225 Difference]: With dead ends: 18 [2018-09-30 20:28:59,971 INFO L226 Difference]: Without dead ends: 16 [2018-09-30 20:28:59,971 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2018-09-30 20:28:59,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-09-30 20:28:59,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-09-30 20:28:59,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-09-30 20:28:59,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-09-30 20:28:59,976 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2018-09-30 20:28:59,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:28:59,976 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-09-30 20:28:59,976 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-30 20:28:59,976 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-09-30 20:28:59,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-09-30 20:28:59,977 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:28:59,977 INFO L375 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1] [2018-09-30 20:28:59,977 INFO L423 AbstractCegarLoop]: === Iteration 12 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:28:59,978 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:28:59,978 INFO L82 PathProgramCache]: Analyzing trace with hash 1047131141, now seen corresponding path program 11 times [2018-09-30 20:28:59,978 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:28:59,978 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:28:59,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:59,979 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:28:59,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:59,989 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:28:59,989 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:28:59,989 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 [2018-09-30 20:29:00,006 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:29:00,053 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-09-30 20:29:00,053 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:00,056 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:00,477 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:00,498 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:00,499 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2018-09-30 20:29:00,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-30 20:29:00,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-30 20:29:00,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-09-30 20:29:00,500 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 15 states. [2018-09-30 20:29:00,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:00,742 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-09-30 20:29:00,743 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-30 20:29:00,743 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 15 [2018-09-30 20:29:00,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:00,744 INFO L225 Difference]: With dead ends: 19 [2018-09-30 20:29:00,744 INFO L226 Difference]: Without dead ends: 17 [2018-09-30 20:29:00,745 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2018-09-30 20:29:00,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-09-30 20:29:00,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-09-30 20:29:00,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-09-30 20:29:00,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-09-30 20:29:00,751 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2018-09-30 20:29:00,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:00,751 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-09-30 20:29:00,751 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-30 20:29:00,752 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-09-30 20:29:00,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-09-30 20:29:00,752 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:00,752 INFO L375 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1] [2018-09-30 20:29:00,753 INFO L423 AbstractCegarLoop]: === Iteration 13 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:00,753 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:00,753 INFO L82 PathProgramCache]: Analyzing trace with hash -1898674972, now seen corresponding path program 12 times [2018-09-30 20:29:00,753 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:00,753 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:00,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:00,754 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:00,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:00,763 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:00,764 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:00,764 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 [2018-09-30 20:29:00,801 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:29:00,849 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-30 20:29:00,849 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:00,852 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:01,320 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:01,343 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:01,344 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2018-09-30 20:29:01,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-30 20:29:01,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-30 20:29:01,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-09-30 20:29:01,345 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 16 states. [2018-09-30 20:29:01,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:01,775 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2018-09-30 20:29:01,775 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-30 20:29:01,775 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 16 [2018-09-30 20:29:01,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:01,776 INFO L225 Difference]: With dead ends: 20 [2018-09-30 20:29:01,776 INFO L226 Difference]: Without dead ends: 18 [2018-09-30 20:29:01,777 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 [2018-09-30 20:29:01,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-09-30 20:29:01,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-09-30 20:29:01,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-09-30 20:29:01,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-09-30 20:29:01,782 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2018-09-30 20:29:01,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:01,782 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-09-30 20:29:01,782 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-30 20:29:01,782 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-09-30 20:29:01,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-09-30 20:29:01,783 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:01,783 INFO L375 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1] [2018-09-30 20:29:01,783 INFO L423 AbstractCegarLoop]: === Iteration 14 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:01,784 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:01,784 INFO L82 PathProgramCache]: Analyzing trace with hash 1270616037, now seen corresponding path program 13 times [2018-09-30 20:29:01,784 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:01,784 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:01,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:01,785 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:01,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:01,796 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:01,797 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:01,797 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 [2018-09-30 20:29:01,808 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:29:01,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:29:01,852 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:02,192 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:02,215 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:02,215 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2018-09-30 20:29:02,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-30 20:29:02,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-30 20:29:02,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-09-30 20:29:02,216 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 17 states. [2018-09-30 20:29:02,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:02,901 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-09-30 20:29:02,901 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-30 20:29:02,901 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 17 [2018-09-30 20:29:02,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:02,902 INFO L225 Difference]: With dead ends: 21 [2018-09-30 20:29:02,903 INFO L226 Difference]: Without dead ends: 19 [2018-09-30 20:29:02,904 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 [2018-09-30 20:29:02,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-30 20:29:02,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-09-30 20:29:02,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-30 20:29:02,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-09-30 20:29:02,908 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2018-09-30 20:29:02,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:02,909 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-09-30 20:29:02,909 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-30 20:29:02,909 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-09-30 20:29:02,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-09-30 20:29:02,910 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:02,910 INFO L375 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1] [2018-09-30 20:29:02,910 INFO L423 AbstractCegarLoop]: === Iteration 15 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:02,910 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:02,911 INFO L82 PathProgramCache]: Analyzing trace with hash 734389508, now seen corresponding path program 14 times [2018-09-30 20:29:02,911 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:02,911 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:02,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:02,912 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:29:02,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:02,921 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:02,921 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:02,922 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 [2018-09-30 20:29:02,938 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:29:02,992 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:29:02,992 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:02,994 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:03,248 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:03,268 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:03,268 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2018-09-30 20:29:03,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-30 20:29:03,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-30 20:29:03,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-09-30 20:29:03,269 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 18 states. [2018-09-30 20:29:03,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:03,579 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-09-30 20:29:03,580 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-30 20:29:03,580 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 18 [2018-09-30 20:29:03,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:03,581 INFO L225 Difference]: With dead ends: 22 [2018-09-30 20:29:03,581 INFO L226 Difference]: Without dead ends: 20 [2018-09-30 20:29:03,582 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 [2018-09-30 20:29:03,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-09-30 20:29:03,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-09-30 20:29:03,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-09-30 20:29:03,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-09-30 20:29:03,586 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2018-09-30 20:29:03,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:03,587 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-09-30 20:29:03,587 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-30 20:29:03,587 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-09-30 20:29:03,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-09-30 20:29:03,587 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:03,587 INFO L375 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1] [2018-09-30 20:29:03,588 INFO L423 AbstractCegarLoop]: === Iteration 16 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:03,588 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:03,588 INFO L82 PathProgramCache]: Analyzing trace with hash 1291236293, now seen corresponding path program 15 times [2018-09-30 20:29:03,588 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:03,588 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:03,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:03,589 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:03,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:03,598 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:03,598 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:03,598 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 [2018-09-30 20:29:03,615 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:29:03,717 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-09-30 20:29:03,718 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:03,721 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:05,156 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:05,177 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:05,177 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2018-09-30 20:29:05,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-30 20:29:05,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-30 20:29:05,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-09-30 20:29:05,178 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 19 states. [2018-09-30 20:29:05,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:05,693 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-09-30 20:29:05,694 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-30 20:29:05,694 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 19 [2018-09-30 20:29:05,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:05,695 INFO L225 Difference]: With dead ends: 23 [2018-09-30 20:29:05,695 INFO L226 Difference]: Without dead ends: 21 [2018-09-30 20:29:05,696 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=39, Invalid=341, Unknown=0, NotChecked=0, Total=380 [2018-09-30 20:29:05,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-09-30 20:29:05,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-09-30 20:29:05,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-09-30 20:29:05,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-09-30 20:29:05,701 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2018-09-30 20:29:05,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:05,701 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-09-30 20:29:05,701 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-30 20:29:05,701 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-09-30 20:29:05,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-30 20:29:05,702 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:05,702 INFO L375 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1] [2018-09-30 20:29:05,702 INFO L423 AbstractCegarLoop]: === Iteration 17 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:05,702 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:05,702 INFO L82 PathProgramCache]: Analyzing trace with hash 1373617444, now seen corresponding path program 16 times [2018-09-30 20:29:05,703 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:05,703 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:05,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:05,703 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:05,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:05,712 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:05,712 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:05,712 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) [2018-09-30 20:29:05,736 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-30 20:29:05,824 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:29:05,824 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:05,827 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:06,124 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:06,146 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:06,146 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2018-09-30 20:29:06,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-30 20:29:06,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-30 20:29:06,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-09-30 20:29:06,147 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 20 states. [2018-09-30 20:29:06,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:06,514 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-09-30 20:29:06,514 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-09-30 20:29:06,514 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 20 [2018-09-30 20:29:06,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:06,515 INFO L225 Difference]: With dead ends: 24 [2018-09-30 20:29:06,515 INFO L226 Difference]: Without dead ends: 22 [2018-09-30 20:29:06,516 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 [2018-09-30 20:29:06,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-09-30 20:29:06,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-09-30 20:29:06,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-09-30 20:29:06,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-09-30 20:29:06,521 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2018-09-30 20:29:06,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:06,522 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-09-30 20:29:06,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-30 20:29:06,522 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-09-30 20:29:06,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-09-30 20:29:06,522 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:06,523 INFO L375 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1] [2018-09-30 20:29:06,523 INFO L423 AbstractCegarLoop]: === Iteration 18 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:06,523 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:06,523 INFO L82 PathProgramCache]: Analyzing trace with hash -367534171, now seen corresponding path program 17 times [2018-09-30 20:29:06,523 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:06,523 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:06,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:06,524 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:06,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:06,533 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:06,534 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:06,534 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 [2018-09-30 20:29:06,550 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:29:06,650 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2018-09-30 20:29:06,651 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:06,654 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:07,018 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:07,039 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:07,039 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2018-09-30 20:29:07,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-09-30 20:29:07,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-09-30 20:29:07,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-09-30 20:29:07,040 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 21 states. [2018-09-30 20:29:07,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:07,463 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-09-30 20:29:07,463 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-09-30 20:29:07,464 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 21 [2018-09-30 20:29:07,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:07,465 INFO L225 Difference]: With dead ends: 25 [2018-09-30 20:29:07,465 INFO L226 Difference]: Without dead ends: 23 [2018-09-30 20:29:07,466 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 [2018-09-30 20:29:07,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-09-30 20:29:07,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-09-30 20:29:07,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-09-30 20:29:07,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-09-30 20:29:07,471 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2018-09-30 20:29:07,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:07,471 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-09-30 20:29:07,472 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-09-30 20:29:07,472 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-09-30 20:29:07,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-09-30 20:29:07,472 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:07,472 INFO L375 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1] [2018-09-30 20:29:07,473 INFO L423 AbstractCegarLoop]: === Iteration 19 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:07,473 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:07,473 INFO L82 PathProgramCache]: Analyzing trace with hash 1491340612, now seen corresponding path program 18 times [2018-09-30 20:29:07,473 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:07,473 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:07,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:07,474 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:07,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:07,483 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:07,483 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:07,483 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 [2018-09-30 20:29:07,497 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:29:07,613 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2018-09-30 20:29:07,613 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:07,617 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:07,989 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:08,010 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:08,011 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2018-09-30 20:29:08,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-09-30 20:29:08,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-09-30 20:29:08,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-09-30 20:29:08,012 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 22 states. [2018-09-30 20:29:08,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:08,474 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2018-09-30 20:29:08,474 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-09-30 20:29:08,474 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 22 [2018-09-30 20:29:08,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:08,475 INFO L225 Difference]: With dead ends: 26 [2018-09-30 20:29:08,475 INFO L226 Difference]: Without dead ends: 24 [2018-09-30 20:29:08,476 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 [2018-09-30 20:29:08,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-09-30 20:29:08,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-09-30 20:29:08,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-09-30 20:29:08,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-09-30 20:29:08,481 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2018-09-30 20:29:08,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:08,481 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-09-30 20:29:08,481 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-09-30 20:29:08,481 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-09-30 20:29:08,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-09-30 20:29:08,482 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:08,482 INFO L375 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1] [2018-09-30 20:29:08,482 INFO L423 AbstractCegarLoop]: === Iteration 20 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:08,483 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:08,483 INFO L82 PathProgramCache]: Analyzing trace with hash -1013083259, now seen corresponding path program 19 times [2018-09-30 20:29:08,483 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:08,483 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:08,484 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:08,484 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:08,484 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:08,492 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:08,492 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:08,492 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 [2018-09-30 20:29:08,505 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:29:08,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:29:08,643 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:09,047 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:09,069 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:09,069 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2018-09-30 20:29:09,069 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-09-30 20:29:09,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-09-30 20:29:09,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-09-30 20:29:09,070 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 23 states. [2018-09-30 20:29:09,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:09,731 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-09-30 20:29:09,731 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-09-30 20:29:09,731 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 23 [2018-09-30 20:29:09,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:09,732 INFO L225 Difference]: With dead ends: 27 [2018-09-30 20:29:09,732 INFO L226 Difference]: Without dead ends: 25 [2018-09-30 20:29:09,733 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 [2018-09-30 20:29:09,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-09-30 20:29:09,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-09-30 20:29:09,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-09-30 20:29:09,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-09-30 20:29:09,739 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2018-09-30 20:29:09,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:09,739 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-09-30 20:29:09,739 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-09-30 20:29:09,739 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-09-30 20:29:09,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-09-30 20:29:09,740 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:09,740 INFO L375 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1] [2018-09-30 20:29:09,740 INFO L423 AbstractCegarLoop]: === Iteration 21 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:09,740 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:09,741 INFO L82 PathProgramCache]: Analyzing trace with hash -1340811932, now seen corresponding path program 20 times [2018-09-30 20:29:09,741 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:09,741 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:09,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:09,742 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:29:09,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:09,750 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:09,750 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:09,750 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 [2018-09-30 20:29:09,767 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:29:09,919 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:29:09,920 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:09,923 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:10,398 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:10,420 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:10,420 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2018-09-30 20:29:10,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-09-30 20:29:10,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-09-30 20:29:10,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-09-30 20:29:10,421 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 24 states. [2018-09-30 20:29:10,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:10,875 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-09-30 20:29:10,876 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-09-30 20:29:10,876 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 24 [2018-09-30 20:29:10,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:10,877 INFO L225 Difference]: With dead ends: 28 [2018-09-30 20:29:10,877 INFO L226 Difference]: Without dead ends: 26 [2018-09-30 20:29:10,878 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 [2018-09-30 20:29:10,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-09-30 20:29:10,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-09-30 20:29:10,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-09-30 20:29:10,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-09-30 20:29:10,883 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2018-09-30 20:29:10,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:10,884 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-09-30 20:29:10,884 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-09-30 20:29:10,884 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-09-30 20:29:10,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-09-30 20:29:10,884 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:10,884 INFO L375 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1] [2018-09-30 20:29:10,885 INFO L423 AbstractCegarLoop]: === Iteration 22 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:10,885 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:10,885 INFO L82 PathProgramCache]: Analyzing trace with hash 1384501093, now seen corresponding path program 21 times [2018-09-30 20:29:10,885 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:10,885 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:10,886 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:10,886 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:10,886 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:10,893 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:10,894 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:10,894 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 [2018-09-30 20:29:10,913 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:29:11,088 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-09-30 20:29:11,088 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:11,091 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:11,586 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:11,607 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:11,607 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2018-09-30 20:29:11,608 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-09-30 20:29:11,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-09-30 20:29:11,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-09-30 20:29:11,608 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 25 states. [2018-09-30 20:29:12,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:12,581 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-09-30 20:29:12,582 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-09-30 20:29:12,582 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 25 [2018-09-30 20:29:12,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:12,583 INFO L225 Difference]: With dead ends: 29 [2018-09-30 20:29:12,583 INFO L226 Difference]: Without dead ends: 27 [2018-09-30 20:29:12,584 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2018-09-30 20:29:12,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-30 20:29:12,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-09-30 20:29:12,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-09-30 20:29:12,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-09-30 20:29:12,587 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2018-09-30 20:29:12,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:12,588 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-09-30 20:29:12,588 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-09-30 20:29:12,588 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-09-30 20:29:12,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-09-30 20:29:12,588 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:12,589 INFO L375 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1] [2018-09-30 20:29:12,589 INFO L423 AbstractCegarLoop]: === Iteration 23 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:12,589 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:12,589 INFO L82 PathProgramCache]: Analyzing trace with hash -30141052, now seen corresponding path program 22 times [2018-09-30 20:29:12,589 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:12,589 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:12,590 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:12,590 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:12,590 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:12,597 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:12,598 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:12,598 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 [2018-09-30 20:29:12,618 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:29:12,817 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:29:12,817 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:12,820 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:13,293 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:13,323 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:13,323 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2018-09-30 20:29:13,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-09-30 20:29:13,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-09-30 20:29:13,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2018-09-30 20:29:13,324 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 26 states. [2018-09-30 20:29:14,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:14,034 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-09-30 20:29:14,034 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-09-30 20:29:14,035 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 26 [2018-09-30 20:29:14,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:14,035 INFO L225 Difference]: With dead ends: 30 [2018-09-30 20:29:14,036 INFO L226 Difference]: Without dead ends: 28 [2018-09-30 20:29:14,037 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2018-09-30 20:29:14,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-09-30 20:29:14,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-09-30 20:29:14,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-09-30 20:29:14,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-09-30 20:29:14,043 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2018-09-30 20:29:14,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:14,044 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-09-30 20:29:14,044 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-09-30 20:29:14,044 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-09-30 20:29:14,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-09-30 20:29:14,044 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:14,045 INFO L375 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1] [2018-09-30 20:29:14,045 INFO L423 AbstractCegarLoop]: === Iteration 24 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:14,045 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:14,045 INFO L82 PathProgramCache]: Analyzing trace with hash -934374587, now seen corresponding path program 23 times [2018-09-30 20:29:14,045 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:14,045 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:14,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:14,046 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:14,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:14,058 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:14,058 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:14,058 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) [2018-09-30 20:29:14,075 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-30 20:29:14,335 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2018-09-30 20:29:14,335 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:14,339 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:15,071 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:15,092 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:15,093 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2018-09-30 20:29:15,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-09-30 20:29:15,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-09-30 20:29:15,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2018-09-30 20:29:15,094 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 27 states. [2018-09-30 20:29:15,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:15,666 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-09-30 20:29:15,666 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-09-30 20:29:15,666 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 27 [2018-09-30 20:29:15,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:15,667 INFO L225 Difference]: With dead ends: 31 [2018-09-30 20:29:15,667 INFO L226 Difference]: Without dead ends: 29 [2018-09-30 20:29:15,668 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2018-09-30 20:29:15,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-09-30 20:29:15,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-09-30 20:29:15,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-09-30 20:29:15,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-09-30 20:29:15,673 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2018-09-30 20:29:15,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:15,673 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-09-30 20:29:15,673 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-09-30 20:29:15,673 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-09-30 20:29:15,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-09-30 20:29:15,674 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:15,674 INFO L375 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1] [2018-09-30 20:29:15,674 INFO L423 AbstractCegarLoop]: === Iteration 25 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:15,674 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:15,675 INFO L82 PathProgramCache]: Analyzing trace with hash 1099156900, now seen corresponding path program 24 times [2018-09-30 20:29:15,675 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:15,675 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:15,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:15,676 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:15,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:15,686 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:15,686 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:15,686 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 [2018-09-30 20:29:15,695 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:29:15,969 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-30 20:29:15,969 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:15,973 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:16,867 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:16,887 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:16,887 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2018-09-30 20:29:16,887 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-09-30 20:29:16,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-09-30 20:29:16,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2018-09-30 20:29:16,888 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 28 states. [2018-09-30 20:29:17,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:17,521 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-09-30 20:29:17,522 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-09-30 20:29:17,522 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 28 [2018-09-30 20:29:17,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:17,523 INFO L225 Difference]: With dead ends: 32 [2018-09-30 20:29:17,523 INFO L226 Difference]: Without dead ends: 30 [2018-09-30 20:29:17,524 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 [2018-09-30 20:29:17,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-09-30 20:29:17,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-09-30 20:29:17,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-09-30 20:29:17,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-09-30 20:29:17,528 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2018-09-30 20:29:17,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:17,528 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-09-30 20:29:17,529 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-09-30 20:29:17,529 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-09-30 20:29:17,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-09-30 20:29:17,529 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:17,529 INFO L375 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1] [2018-09-30 20:29:17,529 INFO L423 AbstractCegarLoop]: === Iteration 26 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:17,530 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:17,530 INFO L82 PathProgramCache]: Analyzing trace with hash -285876443, now seen corresponding path program 25 times [2018-09-30 20:29:17,530 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:17,530 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:17,531 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:17,531 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:17,531 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:17,540 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:17,540 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:17,540 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 [2018-09-30 20:29:17,552 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:29:17,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:29:17,885 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:18,395 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:18,415 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:18,415 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2018-09-30 20:29:18,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-09-30 20:29:18,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-09-30 20:29:18,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2018-09-30 20:29:18,417 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 29 states. [2018-09-30 20:29:19,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:19,028 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-09-30 20:29:19,028 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-09-30 20:29:19,029 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 29 [2018-09-30 20:29:19,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:19,029 INFO L225 Difference]: With dead ends: 33 [2018-09-30 20:29:19,029 INFO L226 Difference]: Without dead ends: 31 [2018-09-30 20:29:19,030 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 [2018-09-30 20:29:19,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-09-30 20:29:19,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-09-30 20:29:19,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-09-30 20:29:19,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-09-30 20:29:19,035 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2018-09-30 20:29:19,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:19,036 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-09-30 20:29:19,036 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-09-30 20:29:19,036 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-09-30 20:29:19,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-09-30 20:29:19,036 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:19,037 INFO L375 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1] [2018-09-30 20:29:19,037 INFO L423 AbstractCegarLoop]: === Iteration 27 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:19,037 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:19,037 INFO L82 PathProgramCache]: Analyzing trace with hash -272237116, now seen corresponding path program 26 times [2018-09-30 20:29:19,037 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:19,037 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:19,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:19,038 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:29:19,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:19,044 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:19,044 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:19,044 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 [2018-09-30 20:29:19,055 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:29:19,442 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:29:19,442 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:19,446 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:20,789 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:20,809 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:20,810 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2018-09-30 20:29:20,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-09-30 20:29:20,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-09-30 20:29:20,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2018-09-30 20:29:20,811 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 30 states. [2018-09-30 20:29:21,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:21,481 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-09-30 20:29:21,481 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-09-30 20:29:21,482 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 30 [2018-09-30 20:29:21,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:21,482 INFO L225 Difference]: With dead ends: 34 [2018-09-30 20:29:21,483 INFO L226 Difference]: Without dead ends: 32 [2018-09-30 20:29:21,484 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=61, Invalid=869, Unknown=0, NotChecked=0, Total=930 [2018-09-30 20:29:21,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-09-30 20:29:21,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-09-30 20:29:21,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-09-30 20:29:21,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-09-30 20:29:21,491 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2018-09-30 20:29:21,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:21,491 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-09-30 20:29:21,491 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-09-30 20:29:21,492 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-09-30 20:29:21,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-09-30 20:29:21,493 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:21,493 INFO L375 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1] [2018-09-30 20:29:21,493 INFO L423 AbstractCegarLoop]: === Iteration 28 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:21,493 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:21,493 INFO L82 PathProgramCache]: Analyzing trace with hash 150582021, now seen corresponding path program 27 times [2018-09-30 20:29:21,494 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:21,494 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:21,494 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:21,494 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:21,495 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:21,501 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:21,501 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:21,501 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 [2018-09-30 20:29:21,515 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:29:21,967 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-09-30 20:29:21,967 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:21,971 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:22,586 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:22,606 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:22,606 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2018-09-30 20:29:22,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-09-30 20:29:22,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-09-30 20:29:22,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2018-09-30 20:29:22,607 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 31 states. [2018-09-30 20:29:23,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:23,363 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-09-30 20:29:23,364 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-09-30 20:29:23,364 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 31 [2018-09-30 20:29:23,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:23,364 INFO L225 Difference]: With dead ends: 35 [2018-09-30 20:29:23,364 INFO L226 Difference]: Without dead ends: 33 [2018-09-30 20:29:23,365 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 [2018-09-30 20:29:23,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-09-30 20:29:23,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-09-30 20:29:23,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-09-30 20:29:23,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-09-30 20:29:23,370 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2018-09-30 20:29:23,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:23,371 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-09-30 20:29:23,371 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-09-30 20:29:23,371 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-09-30 20:29:23,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-09-30 20:29:23,371 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:23,371 INFO L375 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1] [2018-09-30 20:29:23,372 INFO L423 AbstractCegarLoop]: === Iteration 29 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:23,372 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:23,372 INFO L82 PathProgramCache]: Analyzing trace with hash 373073380, now seen corresponding path program 28 times [2018-09-30 20:29:23,372 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:23,372 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:23,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:23,373 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:23,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:23,379 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:23,379 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:23,379 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) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-30 20:29:23,395 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:29:23,911 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:29:23,911 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:23,916 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:24,522 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:24,543 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:24,543 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2018-09-30 20:29:24,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-09-30 20:29:24,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-09-30 20:29:24,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2018-09-30 20:29:24,544 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 32 states. [2018-09-30 20:29:25,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:25,410 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-09-30 20:29:25,411 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-09-30 20:29:25,411 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 32 [2018-09-30 20:29:25,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:25,412 INFO L225 Difference]: With dead ends: 36 [2018-09-30 20:29:25,412 INFO L226 Difference]: Without dead ends: 34 [2018-09-30 20:29:25,413 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 [2018-09-30 20:29:25,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-09-30 20:29:25,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-09-30 20:29:25,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-09-30 20:29:25,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-09-30 20:29:25,417 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2018-09-30 20:29:25,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:25,418 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-09-30 20:29:25,418 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-09-30 20:29:25,418 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-09-30 20:29:25,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-09-30 20:29:25,418 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:25,419 INFO L375 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1] [2018-09-30 20:29:25,419 INFO L423 AbstractCegarLoop]: === Iteration 30 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:25,419 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:25,419 INFO L82 PathProgramCache]: Analyzing trace with hash -1319629083, now seen corresponding path program 29 times [2018-09-30 20:29:25,419 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:25,419 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:25,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:25,420 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:25,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:25,426 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:25,426 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:25,426 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 [2018-09-30 20:29:25,436 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:29:25,936 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2018-09-30 20:29:25,936 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:25,941 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:26,665 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:26,685 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:26,685 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2018-09-30 20:29:26,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-09-30 20:29:26,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-09-30 20:29:26,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2018-09-30 20:29:26,686 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 33 states. [2018-09-30 20:29:27,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:27,599 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-09-30 20:29:27,599 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-09-30 20:29:27,599 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 33 [2018-09-30 20:29:27,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:27,600 INFO L225 Difference]: With dead ends: 37 [2018-09-30 20:29:27,600 INFO L226 Difference]: Without dead ends: 35 [2018-09-30 20:29:27,601 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 [2018-09-30 20:29:27,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-09-30 20:29:27,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-09-30 20:29:27,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-09-30 20:29:27,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-09-30 20:29:27,605 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2018-09-30 20:29:27,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:27,606 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-09-30 20:29:27,606 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-09-30 20:29:27,606 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-09-30 20:29:27,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-09-30 20:29:27,606 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:27,606 INFO L375 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1] [2018-09-30 20:29:27,607 INFO L423 AbstractCegarLoop]: === Iteration 31 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:27,607 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:27,607 INFO L82 PathProgramCache]: Analyzing trace with hash 2041169412, now seen corresponding path program 30 times [2018-09-30 20:29:27,607 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:27,607 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:27,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:27,608 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:27,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:27,614 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:27,614 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:27,614 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 [2018-09-30 20:29:27,627 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:29:28,169 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2018-09-30 20:29:28,169 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:28,173 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:28,928 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:28,948 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:28,948 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2018-09-30 20:29:28,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-09-30 20:29:28,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-09-30 20:29:28,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2018-09-30 20:29:28,949 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 34 states. [2018-09-30 20:29:29,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:29,888 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-09-30 20:29:29,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-09-30 20:29:29,888 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 34 [2018-09-30 20:29:29,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:29,889 INFO L225 Difference]: With dead ends: 38 [2018-09-30 20:29:29,889 INFO L226 Difference]: Without dead ends: 36 [2018-09-30 20:29:29,890 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=69, Invalid=1121, Unknown=0, NotChecked=0, Total=1190 [2018-09-30 20:29:29,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-09-30 20:29:29,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-09-30 20:29:29,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-09-30 20:29:29,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-09-30 20:29:29,894 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2018-09-30 20:29:29,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:29,894 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-09-30 20:29:29,894 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-09-30 20:29:29,895 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-09-30 20:29:29,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-09-30 20:29:29,895 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:29,895 INFO L375 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1] [2018-09-30 20:29:29,895 INFO L423 AbstractCegarLoop]: === Iteration 32 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:29,895 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:29,896 INFO L82 PathProgramCache]: Analyzing trace with hash -1148259643, now seen corresponding path program 31 times [2018-09-30 20:29:29,896 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:29,896 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:29,897 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:29,897 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:29,897 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:29,903 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:29,903 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:29,903 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 [2018-09-30 20:29:29,923 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:29:30,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:29:30,545 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:31,487 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:31,508 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:31,508 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2018-09-30 20:29:31,508 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-09-30 20:29:31,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-09-30 20:29:31,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2018-09-30 20:29:31,509 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 35 states. [2018-09-30 20:29:32,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:32,411 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-09-30 20:29:32,411 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-09-30 20:29:32,411 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 35 [2018-09-30 20:29:32,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:32,412 INFO L225 Difference]: With dead ends: 39 [2018-09-30 20:29:32,412 INFO L226 Difference]: Without dead ends: 37 [2018-09-30 20:29:32,413 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 [2018-09-30 20:29:32,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-09-30 20:29:32,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-09-30 20:29:32,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-09-30 20:29:32,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-09-30 20:29:32,417 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2018-09-30 20:29:32,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:32,417 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-09-30 20:29:32,417 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-09-30 20:29:32,417 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-09-30 20:29:32,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-09-30 20:29:32,417 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:32,418 INFO L375 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1] [2018-09-30 20:29:32,418 INFO L423 AbstractCegarLoop]: === Iteration 33 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:32,418 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:32,418 INFO L82 PathProgramCache]: Analyzing trace with hash -1236312540, now seen corresponding path program 32 times [2018-09-30 20:29:32,418 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:32,418 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:32,419 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:32,419 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:29:32,419 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:32,424 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:32,424 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:32,425 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 [2018-09-30 20:29:32,434 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:29:33,111 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:29:33,111 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:33,116 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:33,843 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:33,863 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:33,863 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2018-09-30 20:29:33,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-09-30 20:29:33,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-09-30 20:29:33,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2018-09-30 20:29:33,864 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 36 states. [2018-09-30 20:29:34,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:34,797 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-09-30 20:29:34,798 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-09-30 20:29:34,798 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 36 [2018-09-30 20:29:34,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:34,798 INFO L225 Difference]: With dead ends: 40 [2018-09-30 20:29:34,799 INFO L226 Difference]: Without dead ends: 38 [2018-09-30 20:29:34,800 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 [2018-09-30 20:29:34,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-09-30 20:29:34,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-09-30 20:29:34,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-09-30 20:29:34,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-09-30 20:29:34,803 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2018-09-30 20:29:34,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:34,804 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-09-30 20:29:34,804 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-09-30 20:29:34,804 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-09-30 20:29:34,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-09-30 20:29:34,804 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:34,804 INFO L375 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1] [2018-09-30 20:29:34,805 INFO L423 AbstractCegarLoop]: === Iteration 34 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:34,805 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:34,805 INFO L82 PathProgramCache]: Analyzing trace with hash 329014949, now seen corresponding path program 33 times [2018-09-30 20:29:34,805 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:34,805 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:34,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:34,806 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:34,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:34,811 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:34,812 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:34,812 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 [2018-09-30 20:29:34,827 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:29:35,526 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-09-30 20:29:35,526 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:35,530 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:36,446 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:36,467 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:36,467 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2018-09-30 20:29:36,468 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-09-30 20:29:36,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-09-30 20:29:36,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2018-09-30 20:29:36,468 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 37 states. [2018-09-30 20:29:37,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:37,443 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-09-30 20:29:37,443 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-09-30 20:29:37,443 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 37 [2018-09-30 20:29:37,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:37,444 INFO L225 Difference]: With dead ends: 41 [2018-09-30 20:29:37,444 INFO L226 Difference]: Without dead ends: 39 [2018-09-30 20:29:37,445 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 [2018-09-30 20:29:37,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-09-30 20:29:37,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-09-30 20:29:37,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-09-30 20:29:37,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-09-30 20:29:37,448 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2018-09-30 20:29:37,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:37,449 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-09-30 20:29:37,449 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-09-30 20:29:37,449 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-09-30 20:29:37,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-09-30 20:29:37,449 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:37,449 INFO L375 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1] [2018-09-30 20:29:37,450 INFO L423 AbstractCegarLoop]: === Iteration 35 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:37,450 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:37,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1609526852, now seen corresponding path program 34 times [2018-09-30 20:29:37,450 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:37,450 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:37,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:37,451 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:37,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:37,456 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:37,456 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:37,456 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 [2018-09-30 20:29:37,466 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:29:38,210 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:29:38,210 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:38,215 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:39,033 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:39,053 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:39,053 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2018-09-30 20:29:39,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-09-30 20:29:39,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-09-30 20:29:39,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2018-09-30 20:29:39,054 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 38 states. [2018-09-30 20:29:40,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:40,178 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-09-30 20:29:40,178 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-09-30 20:29:40,178 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 38 [2018-09-30 20:29:40,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:40,179 INFO L225 Difference]: With dead ends: 42 [2018-09-30 20:29:40,179 INFO L226 Difference]: Without dead ends: 40 [2018-09-30 20:29:40,180 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 [2018-09-30 20:29:40,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-09-30 20:29:40,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-09-30 20:29:40,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-09-30 20:29:40,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-09-30 20:29:40,185 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2018-09-30 20:29:40,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:40,185 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-09-30 20:29:40,185 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-09-30 20:29:40,185 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-09-30 20:29:40,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-09-30 20:29:40,186 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:40,186 INFO L375 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1] [2018-09-30 20:29:40,186 INFO L423 AbstractCegarLoop]: === Iteration 36 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:40,186 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:40,187 INFO L82 PathProgramCache]: Analyzing trace with hash -1644277115, now seen corresponding path program 35 times [2018-09-30 20:29:40,187 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:40,187 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:40,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:40,187 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:40,188 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:40,193 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:40,193 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:40,194 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 [2018-09-30 20:29:40,204 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:29:41,158 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2018-09-30 20:29:41,158 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:41,164 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:42,433 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:42,452 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:42,453 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2018-09-30 20:29:42,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-09-30 20:29:42,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-09-30 20:29:42,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2018-09-30 20:29:42,454 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 39 states. [2018-09-30 20:29:43,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:43,535 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-09-30 20:29:43,536 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-09-30 20:29:43,536 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 39 [2018-09-30 20:29:43,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:43,537 INFO L225 Difference]: With dead ends: 43 [2018-09-30 20:29:43,537 INFO L226 Difference]: Without dead ends: 41 [2018-09-30 20:29:43,538 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 [2018-09-30 20:29:43,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-09-30 20:29:43,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-09-30 20:29:43,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-09-30 20:29:43,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-09-30 20:29:43,541 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2018-09-30 20:29:43,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:43,541 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-09-30 20:29:43,541 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-09-30 20:29:43,541 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-09-30 20:29:43,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-09-30 20:29:43,541 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:43,542 INFO L375 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1] [2018-09-30 20:29:43,542 INFO L423 AbstractCegarLoop]: === Iteration 37 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:43,542 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:43,542 INFO L82 PathProgramCache]: Analyzing trace with hash 567015012, now seen corresponding path program 36 times [2018-09-30 20:29:43,542 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:43,542 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:43,543 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:43,543 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:43,543 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:43,549 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:43,549 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:43,549 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 [2018-09-30 20:29:43,565 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:29:44,627 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-09-30 20:29:44,627 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:44,632 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:45,763 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:45,789 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:45,790 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2018-09-30 20:29:45,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-09-30 20:29:45,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-09-30 20:29:45,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2018-09-30 20:29:45,791 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 40 states. [2018-09-30 20:29:46,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:46,949 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-09-30 20:29:46,949 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-09-30 20:29:46,949 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 40 [2018-09-30 20:29:46,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:46,950 INFO L225 Difference]: With dead ends: 44 [2018-09-30 20:29:46,950 INFO L226 Difference]: Without dead ends: 42 [2018-09-30 20:29:46,951 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=81, Invalid=1559, Unknown=0, NotChecked=0, Total=1640 [2018-09-30 20:29:46,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-09-30 20:29:46,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-09-30 20:29:46,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-09-30 20:29:46,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-09-30 20:29:46,955 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2018-09-30 20:29:46,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:46,955 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-09-30 20:29:46,955 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-09-30 20:29:46,955 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-09-30 20:29:46,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-09-30 20:29:46,956 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:46,956 INFO L375 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1] [2018-09-30 20:29:46,956 INFO L423 AbstractCegarLoop]: === Iteration 38 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:46,956 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:46,957 INFO L82 PathProgramCache]: Analyzing trace with hash 397594213, now seen corresponding path program 37 times [2018-09-30 20:29:46,957 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:46,957 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:46,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:46,957 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:46,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:46,964 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:46,964 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:46,964 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 [2018-09-30 20:29:46,978 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:29:47,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:29:47,992 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:49,006 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:49,026 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:49,026 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2018-09-30 20:29:49,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-09-30 20:29:49,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-09-30 20:29:49,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2018-09-30 20:29:49,027 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 41 states. [2018-09-30 20:29:50,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:50,269 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-09-30 20:29:50,270 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-09-30 20:29:50,270 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 41 [2018-09-30 20:29:50,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:50,270 INFO L225 Difference]: With dead ends: 45 [2018-09-30 20:29:50,271 INFO L226 Difference]: Without dead ends: 43 [2018-09-30 20:29:50,272 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 [2018-09-30 20:29:50,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-09-30 20:29:50,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-09-30 20:29:50,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-09-30 20:29:50,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-09-30 20:29:50,276 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2018-09-30 20:29:50,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:50,276 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-09-30 20:29:50,276 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-09-30 20:29:50,276 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-09-30 20:29:50,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-09-30 20:29:50,276 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:50,277 INFO L375 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1] [2018-09-30 20:29:50,277 INFO L423 AbstractCegarLoop]: === Iteration 39 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:50,277 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:50,277 INFO L82 PathProgramCache]: Analyzing trace with hash -559483260, now seen corresponding path program 38 times [2018-09-30 20:29:50,277 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:50,277 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:50,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:50,278 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:29:50,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:50,284 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:50,284 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:50,284 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 [2018-09-30 20:29:50,295 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:29:51,278 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:29:51,279 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:51,286 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:52,308 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:52,329 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:52,330 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2018-09-30 20:29:52,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-09-30 20:29:52,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-09-30 20:29:52,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2018-09-30 20:29:52,331 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 42 states. [2018-09-30 20:29:53,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:53,609 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-09-30 20:29:53,609 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-09-30 20:29:53,609 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 42 [2018-09-30 20:29:53,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:53,610 INFO L225 Difference]: With dead ends: 46 [2018-09-30 20:29:53,610 INFO L226 Difference]: Without dead ends: 44 [2018-09-30 20:29:53,611 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 [2018-09-30 20:29:53,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-09-30 20:29:53,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-09-30 20:29:53,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-09-30 20:29:53,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-09-30 20:29:53,615 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2018-09-30 20:29:53,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:53,615 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-09-30 20:29:53,615 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-09-30 20:29:53,615 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-09-30 20:29:53,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-09-30 20:29:53,615 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:53,616 INFO L375 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1] [2018-09-30 20:29:53,616 INFO L423 AbstractCegarLoop]: === Iteration 40 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:53,616 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:53,616 INFO L82 PathProgramCache]: Analyzing trace with hash -164113851, now seen corresponding path program 39 times [2018-09-30 20:29:53,616 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:53,616 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:53,617 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:53,617 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:53,617 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:53,622 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:53,622 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:53,622 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 [2018-09-30 20:29:53,637 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:29:54,696 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-09-30 20:29:54,696 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:54,701 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:55,777 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:55,797 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:55,797 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2018-09-30 20:29:55,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-09-30 20:29:55,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-09-30 20:29:55,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2018-09-30 20:29:55,798 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 43 states. [2018-09-30 20:29:57,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:57,112 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-09-30 20:29:57,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-09-30 20:29:57,113 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 43 [2018-09-30 20:29:57,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:57,114 INFO L225 Difference]: With dead ends: 47 [2018-09-30 20:29:57,114 INFO L226 Difference]: Without dead ends: 45 [2018-09-30 20:29:57,115 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=87, Invalid=1805, Unknown=0, NotChecked=0, Total=1892 [2018-09-30 20:29:57,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-09-30 20:29:57,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-09-30 20:29:57,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-09-30 20:29:57,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-09-30 20:29:57,121 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2018-09-30 20:29:57,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:57,122 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-09-30 20:29:57,122 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-09-30 20:29:57,122 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-09-30 20:29:57,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-09-30 20:29:57,122 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:57,122 INFO L375 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1] [2018-09-30 20:29:57,122 INFO L423 AbstractCegarLoop]: === Iteration 41 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:29:57,122 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:57,123 INFO L82 PathProgramCache]: Analyzing trace with hash -792564060, now seen corresponding path program 40 times [2018-09-30 20:29:57,123 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:57,123 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:57,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:57,123 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:57,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:57,129 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:29:57,129 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:29:57,129 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 [2018-09-30 20:29:57,144 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:29:58,663 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:29:58,663 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:58,670 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:59,834 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:59,854 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:29:59,854 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2018-09-30 20:29:59,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-09-30 20:29:59,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-09-30 20:29:59,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1807, Unknown=0, NotChecked=0, Total=1892 [2018-09-30 20:29:59,855 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 44 states. [2018-09-30 20:30:01,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:30:01,240 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-09-30 20:30:01,241 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-09-30 20:30:01,241 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 44 [2018-09-30 20:30:01,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:30:01,242 INFO L225 Difference]: With dead ends: 48 [2018-09-30 20:30:01,242 INFO L226 Difference]: Without dead ends: 46 [2018-09-30 20:30:01,243 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 [2018-09-30 20:30:01,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-09-30 20:30:01,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-09-30 20:30:01,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-09-30 20:30:01,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-09-30 20:30:01,246 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2018-09-30 20:30:01,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:30:01,246 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-09-30 20:30:01,246 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-09-30 20:30:01,247 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-09-30 20:30:01,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-09-30 20:30:01,247 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:30:01,247 INFO L375 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1] [2018-09-30 20:30:01,247 INFO L423 AbstractCegarLoop]: === Iteration 42 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:30:01,247 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:30:01,247 INFO L82 PathProgramCache]: Analyzing trace with hash 1200315941, now seen corresponding path program 41 times [2018-09-30 20:30:01,248 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:30:01,248 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:30:01,248 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:01,248 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:30:01,248 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:01,254 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:30:01,255 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:30:01,255 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 [2018-09-30 20:30:01,270 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:30:02,809 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2018-09-30 20:30:02,810 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:30:02,820 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:30:03,920 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:30:03,939 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:30:03,940 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2018-09-30 20:30:03,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-09-30 20:30:03,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-09-30 20:30:03,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2018-09-30 20:30:03,941 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 45 states. [2018-09-30 20:30:05,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:30:05,366 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-09-30 20:30:05,366 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-09-30 20:30:05,367 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 45 [2018-09-30 20:30:05,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:30:05,367 INFO L225 Difference]: With dead ends: 49 [2018-09-30 20:30:05,367 INFO L226 Difference]: Without dead ends: 47 [2018-09-30 20:30:05,368 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 [2018-09-30 20:30:05,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-09-30 20:30:05,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-09-30 20:30:05,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-09-30 20:30:05,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-09-30 20:30:05,372 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2018-09-30 20:30:05,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:30:05,372 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-09-30 20:30:05,372 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-09-30 20:30:05,372 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-09-30 20:30:05,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-09-30 20:30:05,373 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:30:05,373 INFO L375 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1] [2018-09-30 20:30:05,373 INFO L423 AbstractCegarLoop]: === Iteration 43 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:30:05,373 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:30:05,373 INFO L82 PathProgramCache]: Analyzing trace with hash -1444913468, now seen corresponding path program 42 times [2018-09-30 20:30:05,373 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:30:05,374 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:30:05,374 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:05,374 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:30:05,374 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:05,380 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:30:05,380 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:30:05,380 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 [2018-09-30 20:30:05,395 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:30:07,167 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 22 check-sat command(s) [2018-09-30 20:30:07,167 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:30:07,172 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:30:08,364 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:30:08,384 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:30:08,385 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2018-09-30 20:30:08,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-09-30 20:30:08,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-09-30 20:30:08,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1981, Unknown=0, NotChecked=0, Total=2070 [2018-09-30 20:30:08,386 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 46 states. [2018-09-30 20:30:09,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:30:09,900 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2018-09-30 20:30:09,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-09-30 20:30:09,901 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 46 [2018-09-30 20:30:09,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:30:09,901 INFO L225 Difference]: With dead ends: 50 [2018-09-30 20:30:09,901 INFO L226 Difference]: Without dead ends: 48 [2018-09-30 20:30:09,902 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=93, Invalid=2069, Unknown=0, NotChecked=0, Total=2162 [2018-09-30 20:30:09,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-09-30 20:30:09,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-09-30 20:30:09,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-09-30 20:30:09,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-09-30 20:30:09,907 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2018-09-30 20:30:09,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:30:09,907 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-09-30 20:30:09,907 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-09-30 20:30:09,907 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-09-30 20:30:09,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-09-30 20:30:09,908 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:30:09,908 INFO L375 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1] [2018-09-30 20:30:09,908 INFO L423 AbstractCegarLoop]: === Iteration 44 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:30:09,908 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:30:09,908 INFO L82 PathProgramCache]: Analyzing trace with hash -1842646523, now seen corresponding path program 43 times [2018-09-30 20:30:09,909 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:30:09,909 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:30:09,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:09,909 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:30:09,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:09,915 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:30:09,915 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:30:09,915 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 [2018-09-30 20:30:09,930 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:30:11,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:30:11,680 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:30:12,889 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:30:12,910 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:30:12,910 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2018-09-30 20:30:12,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-09-30 20:30:12,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-09-30 20:30:12,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=2071, Unknown=0, NotChecked=0, Total=2162 [2018-09-30 20:30:12,911 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 47 states. [2018-09-30 20:30:14,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:30:14,468 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-09-30 20:30:14,469 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-09-30 20:30:14,469 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 47 [2018-09-30 20:30:14,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:30:14,470 INFO L225 Difference]: With dead ends: 51 [2018-09-30 20:30:14,470 INFO L226 Difference]: Without dead ends: 49 [2018-09-30 20:30:14,471 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 [2018-09-30 20:30:14,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-09-30 20:30:14,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-09-30 20:30:14,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-09-30 20:30:14,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-09-30 20:30:14,475 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2018-09-30 20:30:14,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:30:14,475 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-09-30 20:30:14,475 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-09-30 20:30:14,475 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-09-30 20:30:14,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-09-30 20:30:14,476 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:30:14,476 INFO L375 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1] [2018-09-30 20:30:14,476 INFO L423 AbstractCegarLoop]: === Iteration 45 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:30:14,476 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:30:14,476 INFO L82 PathProgramCache]: Analyzing trace with hash -1287469340, now seen corresponding path program 44 times [2018-09-30 20:30:14,476 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:30:14,477 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:30:14,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:14,477 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:30:14,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:14,483 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:30:14,483 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:30:14,483 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 [2018-09-30 20:30:14,498 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:30:16,182 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:30:16,182 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:30:16,191 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:30:17,436 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:30:17,456 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:30:17,456 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2018-09-30 20:30:17,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-09-30 20:30:17,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-09-30 20:30:17,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=2163, Unknown=0, NotChecked=0, Total=2256 [2018-09-30 20:30:17,457 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 48 states. [2018-09-30 20:30:19,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:30:19,085 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2018-09-30 20:30:19,085 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-09-30 20:30:19,085 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 48 [2018-09-30 20:30:19,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:30:19,086 INFO L225 Difference]: With dead ends: 52 [2018-09-30 20:30:19,086 INFO L226 Difference]: Without dead ends: 50 [2018-09-30 20:30:19,087 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 [2018-09-30 20:30:19,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-09-30 20:30:19,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-09-30 20:30:19,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-09-30 20:30:19,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-09-30 20:30:19,091 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2018-09-30 20:30:19,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:30:19,092 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-09-30 20:30:19,092 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-09-30 20:30:19,092 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-09-30 20:30:19,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-09-30 20:30:19,092 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:30:19,092 INFO L375 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1] [2018-09-30 20:30:19,092 INFO L423 AbstractCegarLoop]: === Iteration 46 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:30:19,093 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:30:19,093 INFO L82 PathProgramCache]: Analyzing trace with hash -1256845851, now seen corresponding path program 45 times [2018-09-30 20:30:19,093 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:30:19,093 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:30:19,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:19,094 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:30:19,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:19,099 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:30:19,099 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:30:19,099 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 [2018-09-30 20:30:19,114 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:30:21,217 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-09-30 20:30:21,218 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:30:21,222 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:30:22,613 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:30:22,633 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:30:22,634 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2018-09-30 20:30:22,634 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-09-30 20:30:22,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-09-30 20:30:22,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=2257, Unknown=0, NotChecked=0, Total=2352 [2018-09-30 20:30:22,634 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 49 states. [2018-09-30 20:30:24,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:30:24,332 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-09-30 20:30:24,332 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-09-30 20:30:24,333 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 49 [2018-09-30 20:30:24,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:30:24,333 INFO L225 Difference]: With dead ends: 53 [2018-09-30 20:30:24,334 INFO L226 Difference]: Without dead ends: 51 [2018-09-30 20:30:24,334 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=99, Invalid=2351, Unknown=0, NotChecked=0, Total=2450 [2018-09-30 20:30:24,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-09-30 20:30:24,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-09-30 20:30:24,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-09-30 20:30:24,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-09-30 20:30:24,338 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2018-09-30 20:30:24,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:30:24,339 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-09-30 20:30:24,339 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-09-30 20:30:24,339 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-09-30 20:30:24,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-09-30 20:30:24,339 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:30:24,339 INFO L375 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1] [2018-09-30 20:30:24,340 INFO L423 AbstractCegarLoop]: === Iteration 47 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:30:24,340 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:30:24,340 INFO L82 PathProgramCache]: Analyzing trace with hash -307517692, now seen corresponding path program 46 times [2018-09-30 20:30:24,340 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:30:24,340 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:30:24,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:24,341 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:30:24,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:24,346 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:30:24,346 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:30:24,346 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 [2018-09-30 20:30:24,362 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:30:26,756 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:30:26,757 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:30:26,767 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:30:28,149 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:30:28,168 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:30:28,168 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2018-09-30 20:30:28,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-09-30 20:30:28,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-09-30 20:30:28,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=2353, Unknown=0, NotChecked=0, Total=2450 [2018-09-30 20:30:28,169 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 50 states. [2018-09-30 20:30:29,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:30:29,935 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-09-30 20:30:29,936 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-09-30 20:30:29,936 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 50 [2018-09-30 20:30:29,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:30:29,937 INFO L225 Difference]: With dead ends: 54 [2018-09-30 20:30:29,937 INFO L226 Difference]: Without dead ends: 52 [2018-09-30 20:30:29,938 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=101, Invalid=2449, Unknown=0, NotChecked=0, Total=2550 [2018-09-30 20:30:29,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-09-30 20:30:29,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-09-30 20:30:29,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-09-30 20:30:29,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-09-30 20:30:29,942 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2018-09-30 20:30:29,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:30:29,942 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-09-30 20:30:29,942 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-09-30 20:30:29,942 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-09-30 20:30:29,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-09-30 20:30:29,942 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:30:29,943 INFO L375 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1] [2018-09-30 20:30:29,943 INFO L423 AbstractCegarLoop]: === Iteration 48 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:30:29,943 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:30:29,943 INFO L82 PathProgramCache]: Analyzing trace with hash -943115835, now seen corresponding path program 47 times [2018-09-30 20:30:29,943 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:30:29,943 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:30:29,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:29,944 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:30:29,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:29,948 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:30:29,948 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:30:29,948 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 [2018-09-30 20:30:29,957 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:30:32,593 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2018-09-30 20:30:32,594 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:30:32,604 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:30:33,998 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:30:34,019 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:30:34,020 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2018-09-30 20:30:34,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-09-30 20:30:34,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-09-30 20:30:34,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=2451, Unknown=0, NotChecked=0, Total=2550 [2018-09-30 20:30:34,021 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 51 states. [2018-09-30 20:30:35,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:30:35,856 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-09-30 20:30:35,856 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-09-30 20:30:35,857 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 51 [2018-09-30 20:30:35,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:30:35,857 INFO L225 Difference]: With dead ends: 55 [2018-09-30 20:30:35,858 INFO L226 Difference]: Without dead ends: 53 [2018-09-30 20:30:35,858 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=103, Invalid=2549, Unknown=0, NotChecked=0, Total=2652 [2018-09-30 20:30:35,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-09-30 20:30:35,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-09-30 20:30:35,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-09-30 20:30:35,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-09-30 20:30:35,864 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2018-09-30 20:30:35,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:30:35,864 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-09-30 20:30:35,864 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-09-30 20:30:35,864 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-09-30 20:30:35,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-09-30 20:30:35,865 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:30:35,865 INFO L375 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1] [2018-09-30 20:30:35,865 INFO L423 AbstractCegarLoop]: === Iteration 49 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:30:35,865 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:30:35,865 INFO L82 PathProgramCache]: Analyzing trace with hash 828178212, now seen corresponding path program 48 times [2018-09-30 20:30:35,865 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:30:35,865 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:30:35,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:35,866 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:30:35,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:35,871 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:30:35,872 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:30:35,872 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-30 20:30:35,880 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:30:38,610 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2018-09-30 20:30:38,610 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:30:38,615 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:30:40,035 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:30:40,056 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:30:40,057 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2018-09-30 20:30:40,057 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-09-30 20:30:40,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-09-30 20:30:40,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=2551, Unknown=0, NotChecked=0, Total=2652 [2018-09-30 20:30:40,058 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 52 states. [2018-09-30 20:30:41,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:30:41,968 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2018-09-30 20:30:41,969 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-09-30 20:30:41,969 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 52 [2018-09-30 20:30:41,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:30:41,970 INFO L225 Difference]: With dead ends: 56 [2018-09-30 20:30:41,970 INFO L226 Difference]: Without dead ends: 54 [2018-09-30 20:30:41,971 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 [2018-09-30 20:30:41,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-09-30 20:30:41,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-09-30 20:30:41,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-09-30 20:30:41,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-09-30 20:30:41,975 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2018-09-30 20:30:41,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:30:41,975 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-09-30 20:30:41,975 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-09-30 20:30:41,976 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-09-30 20:30:41,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-09-30 20:30:41,976 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:30:41,976 INFO L375 BasicCegarLoop]: trace histogram [49, 1, 1, 1, 1] [2018-09-30 20:30:41,976 INFO L423 AbstractCegarLoop]: === Iteration 50 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:30:41,976 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:30:41,977 INFO L82 PathProgramCache]: Analyzing trace with hash -96281179, now seen corresponding path program 49 times [2018-09-30 20:30:41,977 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:30:41,977 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:30:41,977 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:41,977 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:30:41,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:41,983 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:30:41,983 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:30:41,983 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 [2018-09-30 20:30:41,992 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:30:44,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:30:44,566 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:30:46,610 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:30:46,631 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:30:46,631 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2018-09-30 20:30:46,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-09-30 20:30:46,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-09-30 20:30:46,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=2653, Unknown=0, NotChecked=0, Total=2756 [2018-09-30 20:30:46,633 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 53 states. [2018-09-30 20:30:48,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:30:48,605 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-09-30 20:30:48,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-09-30 20:30:48,605 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 53 [2018-09-30 20:30:48,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:30:48,606 INFO L225 Difference]: With dead ends: 57 [2018-09-30 20:30:48,607 INFO L226 Difference]: Without dead ends: 55 [2018-09-30 20:30:48,607 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=107, Invalid=2755, Unknown=0, NotChecked=0, Total=2862 [2018-09-30 20:30:48,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-09-30 20:30:48,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-09-30 20:30:48,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-09-30 20:30:48,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-09-30 20:30:48,612 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2018-09-30 20:30:48,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:30:48,613 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-09-30 20:30:48,613 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-09-30 20:30:48,613 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-09-30 20:30:48,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-09-30 20:30:48,613 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:30:48,613 INFO L375 BasicCegarLoop]: trace histogram [50, 1, 1, 1, 1] [2018-09-30 20:30:48,614 INFO L423 AbstractCegarLoop]: === Iteration 51 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:30:48,614 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:30:48,614 INFO L82 PathProgramCache]: Analyzing trace with hash 1310248772, now seen corresponding path program 50 times [2018-09-30 20:30:48,614 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:30:48,614 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:30:48,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:48,615 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:30:48,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:48,621 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:30:48,621 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:30:48,621 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 [2018-09-30 20:30:48,637 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:30:51,301 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:30:51,301 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:30:51,313 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:30:52,922 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:30:52,942 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:30:52,942 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2018-09-30 20:30:52,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-09-30 20:30:52,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-09-30 20:30:52,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=2757, Unknown=0, NotChecked=0, Total=2862 [2018-09-30 20:30:52,943 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 54 states. [2018-09-30 20:30:55,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:30:55,031 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2018-09-30 20:30:55,031 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-09-30 20:30:55,031 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 54 [2018-09-30 20:30:55,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:30:55,032 INFO L225 Difference]: With dead ends: 58 [2018-09-30 20:30:55,032 INFO L226 Difference]: Without dead ends: 56 [2018-09-30 20:30:55,033 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 [2018-09-30 20:30:55,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-09-30 20:30:55,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2018-09-30 20:30:55,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-09-30 20:30:55,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-09-30 20:30:55,037 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2018-09-30 20:30:55,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:30:55,037 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-09-30 20:30:55,037 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-09-30 20:30:55,037 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-09-30 20:30:55,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-09-30 20:30:55,038 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:30:55,038 INFO L375 BasicCegarLoop]: trace histogram [51, 1, 1, 1, 1] [2018-09-30 20:30:55,038 INFO L423 AbstractCegarLoop]: === Iteration 52 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:30:55,038 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:30:55,038 INFO L82 PathProgramCache]: Analyzing trace with hash 1963004293, now seen corresponding path program 51 times [2018-09-30 20:30:55,038 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:30:55,038 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:30:55,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:55,039 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:30:55,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:30:55,045 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:30:55,045 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:30:55,045 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 [2018-09-30 20:30:55,066 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:30:58,286 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-09-30 20:30:58,286 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:30:58,293 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:30:59,858 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:30:59,877 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:30:59,878 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2018-09-30 20:30:59,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-09-30 20:30:59,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-09-30 20:30:59,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=2863, Unknown=0, NotChecked=0, Total=2970 [2018-09-30 20:30:59,879 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 55 states. [2018-09-30 20:31:02,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:31:02,067 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-09-30 20:31:02,068 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-09-30 20:31:02,068 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 55 [2018-09-30 20:31:02,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:31:02,069 INFO L225 Difference]: With dead ends: 59 [2018-09-30 20:31:02,069 INFO L226 Difference]: Without dead ends: 57 [2018-09-30 20:31:02,069 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=111, Invalid=2969, Unknown=0, NotChecked=0, Total=3080 [2018-09-30 20:31:02,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-09-30 20:31:02,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-09-30 20:31:02,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-09-30 20:31:02,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-09-30 20:31:02,074 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2018-09-30 20:31:02,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:31:02,074 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-09-30 20:31:02,074 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-09-30 20:31:02,074 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-09-30 20:31:02,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-09-30 20:31:02,074 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:31:02,074 INFO L375 BasicCegarLoop]: trace histogram [52, 1, 1, 1, 1] [2018-09-30 20:31:02,075 INFO L423 AbstractCegarLoop]: === Iteration 53 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:31:02,075 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:31:02,075 INFO L82 PathProgramCache]: Analyzing trace with hash 723588964, now seen corresponding path program 52 times [2018-09-30 20:31:02,075 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:31:02,075 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:31:02,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:31:02,076 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:31:02,076 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:31:02,082 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:31:02,082 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:31:02,082 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 [2018-09-30 20:31:02,091 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:31:05,296 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:31:05,296 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:31:05,309 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:31:06,978 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:31:06,998 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:31:06,998 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2018-09-30 20:31:06,999 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-09-30 20:31:06,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-09-30 20:31:06,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=2971, Unknown=0, NotChecked=0, Total=3080 [2018-09-30 20:31:07,000 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 56 states. [2018-09-30 20:31:09,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:31:09,232 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-09-30 20:31:09,232 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-09-30 20:31:09,233 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 56 [2018-09-30 20:31:09,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:31:09,234 INFO L225 Difference]: With dead ends: 60 [2018-09-30 20:31:09,234 INFO L226 Difference]: Without dead ends: 58 [2018-09-30 20:31:09,234 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=113, Invalid=3079, Unknown=0, NotChecked=0, Total=3192 [2018-09-30 20:31:09,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-09-30 20:31:09,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-09-30 20:31:09,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-09-30 20:31:09,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2018-09-30 20:31:09,238 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2018-09-30 20:31:09,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:31:09,238 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2018-09-30 20:31:09,238 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-09-30 20:31:09,238 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2018-09-30 20:31:09,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-09-30 20:31:09,238 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:31:09,238 INFO L375 BasicCegarLoop]: trace histogram [53, 1, 1, 1, 1] [2018-09-30 20:31:09,239 INFO L423 AbstractCegarLoop]: === Iteration 54 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:31:09,239 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:31:09,239 INFO L82 PathProgramCache]: Analyzing trace with hash 956419429, now seen corresponding path program 53 times [2018-09-30 20:31:09,239 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:31:09,239 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:31:09,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:31:09,240 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:31:09,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:31:09,246 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:31:09,246 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:31:09,246 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 [2018-09-30 20:31:09,254 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:31:13,232 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 28 check-sat command(s) [2018-09-30 20:31:13,232 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:31:13,245 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:31:14,943 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:31:14,963 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:31:14,964 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2018-09-30 20:31:14,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-09-30 20:31:14,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-09-30 20:31:14,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=3081, Unknown=0, NotChecked=0, Total=3192 [2018-09-30 20:31:14,964 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 57 states. [2018-09-30 20:31:17,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:31:17,279 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-09-30 20:31:17,279 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-09-30 20:31:17,279 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 57 [2018-09-30 20:31:17,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:31:17,280 INFO L225 Difference]: With dead ends: 61 [2018-09-30 20:31:17,280 INFO L226 Difference]: Without dead ends: 59 [2018-09-30 20:31:17,281 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 [2018-09-30 20:31:17,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-09-30 20:31:17,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-09-30 20:31:17,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-09-30 20:31:17,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-09-30 20:31:17,285 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2018-09-30 20:31:17,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:31:17,285 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-09-30 20:31:17,285 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-09-30 20:31:17,285 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-09-30 20:31:17,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-09-30 20:31:17,285 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:31:17,285 INFO L375 BasicCegarLoop]: trace histogram [54, 1, 1, 1, 1] [2018-09-30 20:31:17,286 INFO L423 AbstractCegarLoop]: === Iteration 55 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:31:17,286 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:31:17,286 INFO L82 PathProgramCache]: Analyzing trace with hash -415770748, now seen corresponding path program 54 times [2018-09-30 20:31:17,286 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:31:17,286 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:31:17,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:31:17,286 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:31:17,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:31:17,292 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:31:17,292 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:31:17,292 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 [2018-09-30 20:31:17,309 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:31:21,644 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 28 check-sat command(s) [2018-09-30 20:31:21,644 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:31:21,652 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:31:23,427 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:31:23,447 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:31:23,447 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2018-09-30 20:31:23,447 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-09-30 20:31:23,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-09-30 20:31:23,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=3193, Unknown=0, NotChecked=0, Total=3306 [2018-09-30 20:31:23,448 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 58 states. [2018-09-30 20:31:25,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:31:25,829 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2018-09-30 20:31:25,829 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-09-30 20:31:25,829 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 58 [2018-09-30 20:31:25,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:31:25,830 INFO L225 Difference]: With dead ends: 62 [2018-09-30 20:31:25,830 INFO L226 Difference]: Without dead ends: 60 [2018-09-30 20:31:25,831 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=117, Invalid=3305, Unknown=0, NotChecked=0, Total=3422 [2018-09-30 20:31:25,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-09-30 20:31:25,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-09-30 20:31:25,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-09-30 20:31:25,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-09-30 20:31:25,836 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 58 [2018-09-30 20:31:25,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:31:25,836 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-09-30 20:31:25,836 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-09-30 20:31:25,836 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-09-30 20:31:25,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-09-30 20:31:25,836 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:31:25,836 INFO L375 BasicCegarLoop]: trace histogram [55, 1, 1, 1, 1] [2018-09-30 20:31:25,837 INFO L423 AbstractCegarLoop]: === Iteration 56 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:31:25,837 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:31:25,837 INFO L82 PathProgramCache]: Analyzing trace with hash -3993275, now seen corresponding path program 55 times [2018-09-30 20:31:25,837 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:31:25,837 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:31:25,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:31:25,838 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:31:25,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:31:25,845 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:31:25,845 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:31:25,845 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 [2018-09-30 20:31:25,859 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:31:29,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:31:29,563 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:31:31,502 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:31:31,522 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:31:31,522 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2018-09-30 20:31:31,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-09-30 20:31:31,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-09-30 20:31:31,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=3307, Unknown=0, NotChecked=0, Total=3422 [2018-09-30 20:31:31,523 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 59 states. [2018-09-30 20:31:33,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:31:33,974 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-09-30 20:31:33,975 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-09-30 20:31:33,975 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 59 [2018-09-30 20:31:33,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:31:33,975 INFO L225 Difference]: With dead ends: 63 [2018-09-30 20:31:33,976 INFO L226 Difference]: Without dead ends: 61 [2018-09-30 20:31:33,976 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 [2018-09-30 20:31:33,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-09-30 20:31:33,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-09-30 20:31:33,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-09-30 20:31:33,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-09-30 20:31:33,981 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 59 [2018-09-30 20:31:33,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:31:33,981 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-09-30 20:31:33,981 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-09-30 20:31:33,981 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-09-30 20:31:33,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-09-30 20:31:33,982 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:31:33,982 INFO L375 BasicCegarLoop]: trace histogram [56, 1, 1, 1, 1] [2018-09-30 20:31:33,982 INFO L423 AbstractCegarLoop]: === Iteration 57 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:31:33,982 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:31:33,982 INFO L82 PathProgramCache]: Analyzing trace with hash -123793500, now seen corresponding path program 56 times [2018-09-30 20:31:33,982 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:31:33,982 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:31:33,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:31:33,983 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:31:33,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:31:33,989 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:31:33,989 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:31:33,990 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 [2018-09-30 20:31:34,004 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:31:37,883 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:31:37,883 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:31:37,898 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:31:39,858 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:31:39,878 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:31:39,878 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2018-09-30 20:31:39,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-09-30 20:31:39,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-09-30 20:31:39,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=3423, Unknown=0, NotChecked=0, Total=3540 [2018-09-30 20:31:39,879 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 60 states. [2018-09-30 20:31:42,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:31:42,409 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2018-09-30 20:31:42,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-09-30 20:31:42,409 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 60 [2018-09-30 20:31:42,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:31:42,410 INFO L225 Difference]: With dead ends: 64 [2018-09-30 20:31:42,410 INFO L226 Difference]: Without dead ends: 62 [2018-09-30 20:31:42,411 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 [2018-09-30 20:31:42,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-09-30 20:31:42,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2018-09-30 20:31:42,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-09-30 20:31:42,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2018-09-30 20:31:42,417 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 60 [2018-09-30 20:31:42,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:31:42,417 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2018-09-30 20:31:42,417 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-09-30 20:31:42,417 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2018-09-30 20:31:42,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-09-30 20:31:42,418 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:31:42,418 INFO L375 BasicCegarLoop]: trace histogram [57, 1, 1, 1, 1] [2018-09-30 20:31:42,418 INFO L423 AbstractCegarLoop]: === Iteration 58 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:31:42,418 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:31:42,418 INFO L82 PathProgramCache]: Analyzing trace with hash 457366821, now seen corresponding path program 57 times [2018-09-30 20:31:42,419 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:31:42,419 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:31:42,419 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:31:42,419 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:31:42,419 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:31:42,425 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:31:42,425 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:31:42,426 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 [2018-09-30 20:31:42,437 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:31:47,495 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-09-30 20:31:47,496 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:31:47,504 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:31:49,724 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:31:49,745 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:31:49,745 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2018-09-30 20:31:49,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-09-30 20:31:49,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-09-30 20:31:49,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=3541, Unknown=0, NotChecked=0, Total=3660 [2018-09-30 20:31:49,746 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand 61 states. [2018-09-30 20:31:52,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:31:52,371 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2018-09-30 20:31:52,372 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-09-30 20:31:52,372 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 61 [2018-09-30 20:31:52,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:31:52,372 INFO L225 Difference]: With dead ends: 65 [2018-09-30 20:31:52,373 INFO L226 Difference]: Without dead ends: 63 [2018-09-30 20:31:52,373 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 [2018-09-30 20:31:52,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-09-30 20:31:52,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-09-30 20:31:52,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-09-30 20:31:52,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-09-30 20:31:52,379 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 61 [2018-09-30 20:31:52,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:31:52,379 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-09-30 20:31:52,379 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-09-30 20:31:52,379 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-09-30 20:31:52,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-09-30 20:31:52,380 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:31:52,380 INFO L375 BasicCegarLoop]: trace histogram [58, 1, 1, 1, 1] [2018-09-30 20:31:52,380 INFO L423 AbstractCegarLoop]: === Iteration 59 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:31:52,380 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:31:52,380 INFO L82 PathProgramCache]: Analyzing trace with hash 1293467588, now seen corresponding path program 58 times [2018-09-30 20:31:52,381 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:31:52,381 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:31:52,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:31:52,381 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:31:52,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:31:52,386 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:31:52,387 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:31:52,387 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 [2018-09-30 20:31:52,402 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:31:57,052 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:31:57,052 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:31:57,069 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:31:59,125 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:31:59,144 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:31:59,145 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2018-09-30 20:31:59,145 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-09-30 20:31:59,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-09-30 20:31:59,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=3661, Unknown=0, NotChecked=0, Total=3782 [2018-09-30 20:31:59,146 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 62 states. [2018-09-30 20:32:01,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:32:01,873 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-09-30 20:32:01,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-09-30 20:32:01,874 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 62 [2018-09-30 20:32:01,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:32:01,875 INFO L225 Difference]: With dead ends: 66 [2018-09-30 20:32:01,875 INFO L226 Difference]: Without dead ends: 64 [2018-09-30 20:32:01,875 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 [2018-09-30 20:32:01,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-09-30 20:32:01,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2018-09-30 20:32:01,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-09-30 20:32:01,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 64 transitions. [2018-09-30 20:32:01,879 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 64 transitions. Word has length 62 [2018-09-30 20:32:01,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:32:01,880 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 64 transitions. [2018-09-30 20:32:01,880 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-09-30 20:32:01,880 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 64 transitions. [2018-09-30 20:32:01,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-09-30 20:32:01,880 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:32:01,880 INFO L375 BasicCegarLoop]: trace histogram [59, 1, 1, 1, 1] [2018-09-30 20:32:01,880 INFO L423 AbstractCegarLoop]: === Iteration 60 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:32:01,880 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:32:01,880 INFO L82 PathProgramCache]: Analyzing trace with hash 1442787589, now seen corresponding path program 59 times [2018-09-30 20:32:01,881 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:32:01,881 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:32:01,881 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:32:01,881 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:32:01,881 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:32:01,888 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:32:01,888 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:32:01,889 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 [2018-09-30 20:32:01,906 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:32:07,980 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 31 check-sat command(s) [2018-09-30 20:32:07,980 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:32:07,996 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:32:10,061 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:32:10,082 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:32:10,082 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62] total 62 [2018-09-30 20:32:10,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-09-30 20:32:10,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-09-30 20:32:10,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=3783, Unknown=0, NotChecked=0, Total=3906 [2018-09-30 20:32:10,083 INFO L87 Difference]: Start difference. First operand 64 states and 64 transitions. Second operand 63 states. [2018-09-30 20:32:12,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:32:12,900 INFO L93 Difference]: Finished difference Result 67 states and 67 transitions. [2018-09-30 20:32:12,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-09-30 20:32:12,900 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 63 [2018-09-30 20:32:12,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:32:12,901 INFO L225 Difference]: With dead ends: 67 [2018-09-30 20:32:12,901 INFO L226 Difference]: Without dead ends: 65 [2018-09-30 20:32:12,902 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 [2018-09-30 20:32:12,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-09-30 20:32:12,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2018-09-30 20:32:12,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-09-30 20:32:12,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2018-09-30 20:32:12,907 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 63 [2018-09-30 20:32:12,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:32:12,907 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2018-09-30 20:32:12,907 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-09-30 20:32:12,907 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2018-09-30 20:32:12,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-09-30 20:32:12,907 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:32:12,907 INFO L375 BasicCegarLoop]: trace histogram [60, 1, 1, 1, 1] [2018-09-30 20:32:12,908 INFO L423 AbstractCegarLoop]: === Iteration 61 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:32:12,908 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:32:12,908 INFO L82 PathProgramCache]: Analyzing trace with hash 1776740324, now seen corresponding path program 60 times [2018-09-30 20:32:12,908 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:32:12,908 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:32:12,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:32:12,909 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:32:12,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:32:12,915 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:32:12,916 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:32:12,916 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-30 20:32:12,931 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:32:19,092 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2018-09-30 20:32:19,092 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:32:19,099 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:32:21,192 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 0 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:32:21,213 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:32:21,213 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63] total 63 [2018-09-30 20:32:21,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-09-30 20:32:21,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-09-30 20:32:21,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=3907, Unknown=0, NotChecked=0, Total=4032 [2018-09-30 20:32:21,214 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 64 states. [2018-09-30 20:32:24,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:32:24,096 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2018-09-30 20:32:24,097 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-09-30 20:32:24,097 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 64 [2018-09-30 20:32:24,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:32:24,098 INFO L225 Difference]: With dead ends: 68 [2018-09-30 20:32:24,098 INFO L226 Difference]: Without dead ends: 66 [2018-09-30 20:32:24,098 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 [2018-09-30 20:32:24,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-09-30 20:32:24,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-09-30 20:32:24,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-09-30 20:32:24,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-09-30 20:32:24,102 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 64 [2018-09-30 20:32:24,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:32:24,103 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-09-30 20:32:24,103 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-09-30 20:32:24,103 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-09-30 20:32:24,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-09-30 20:32:24,103 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:32:24,103 INFO L375 BasicCegarLoop]: trace histogram [61, 1, 1, 1, 1] [2018-09-30 20:32:24,103 INFO L423 AbstractCegarLoop]: === Iteration 62 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:32:24,104 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:32:24,104 INFO L82 PathProgramCache]: Analyzing trace with hash -755626779, now seen corresponding path program 61 times [2018-09-30 20:32:24,104 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:32:24,104 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:32:24,104 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:32:24,104 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:32:24,104 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:32:24,109 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:32:24,110 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:32:24,110 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 [2018-09-30 20:32:24,119 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:32:29,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:32:29,724 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:32:31,935 INFO L134 CoverageAnalysis]: Checked inductivity of 1891 backedges. 0 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:32:31,955 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:32:31,956 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64] total 64 [2018-09-30 20:32:31,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-09-30 20:32:31,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-09-30 20:32:31,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=4033, Unknown=0, NotChecked=0, Total=4160 [2018-09-30 20:32:31,957 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 65 states. [2018-09-30 20:32:34,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:32:34,947 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-09-30 20:32:34,947 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-09-30 20:32:34,947 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 65 [2018-09-30 20:32:34,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:32:34,948 INFO L225 Difference]: With dead ends: 69 [2018-09-30 20:32:34,948 INFO L226 Difference]: Without dead ends: 67 [2018-09-30 20:32:34,949 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=131, Invalid=4159, Unknown=0, NotChecked=0, Total=4290 [2018-09-30 20:32:34,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-09-30 20:32:34,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-09-30 20:32:34,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-09-30 20:32:34,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2018-09-30 20:32:34,955 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 65 [2018-09-30 20:32:34,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:32:34,955 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2018-09-30 20:32:34,955 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-09-30 20:32:34,955 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2018-09-30 20:32:34,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-09-30 20:32:34,956 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:32:34,956 INFO L375 BasicCegarLoop]: trace histogram [62, 1, 1, 1, 1] [2018-09-30 20:32:34,956 INFO L423 AbstractCegarLoop]: === Iteration 63 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:32:34,956 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:32:34,956 INFO L82 PathProgramCache]: Analyzing trace with hash -1949595644, now seen corresponding path program 62 times [2018-09-30 20:32:34,957 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:32:34,957 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:32:34,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:32:34,957 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:32:34,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:32:34,964 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:32:34,964 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:32:34,964 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 [2018-09-30 20:32:34,984 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:32:40,930 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:32:40,930 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:32:40,948 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:32:43,164 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:32:43,184 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:32:43,184 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65] total 65 [2018-09-30 20:32:43,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-09-30 20:32:43,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-09-30 20:32:43,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=4161, Unknown=0, NotChecked=0, Total=4290 [2018-09-30 20:32:43,185 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 66 states. [2018-09-30 20:32:46,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:32:46,246 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2018-09-30 20:32:46,246 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-09-30 20:32:46,246 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 66 [2018-09-30 20:32:46,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:32:46,247 INFO L225 Difference]: With dead ends: 70 [2018-09-30 20:32:46,247 INFO L226 Difference]: Without dead ends: 68 [2018-09-30 20:32:46,247 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 [2018-09-30 20:32:46,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-09-30 20:32:46,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2018-09-30 20:32:46,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-09-30 20:32:46,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2018-09-30 20:32:46,253 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 66 [2018-09-30 20:32:46,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:32:46,253 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2018-09-30 20:32:46,253 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-09-30 20:32:46,253 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2018-09-30 20:32:46,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-09-30 20:32:46,254 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:32:46,254 INFO L375 BasicCegarLoop]: trace histogram [63, 1, 1, 1, 1] [2018-09-30 20:32:46,254 INFO L423 AbstractCegarLoop]: === Iteration 64 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:32:46,254 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:32:46,254 INFO L82 PathProgramCache]: Analyzing trace with hash -307924795, now seen corresponding path program 63 times [2018-09-30 20:32:46,254 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:32:46,255 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:32:46,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:32:46,255 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:32:46,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:32:46,262 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:32:46,262 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:32:46,262 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 [2018-09-30 20:32:46,272 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:32:54,185 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-09-30 20:32:54,186 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:32:54,195 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:32:56,613 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:32:56,632 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:32:56,633 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66] total 66 [2018-09-30 20:32:56,633 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-09-30 20:32:56,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-09-30 20:32:56,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=4291, Unknown=0, NotChecked=0, Total=4422 [2018-09-30 20:32:56,634 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand 67 states. [2018-09-30 20:32:59,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:32:59,789 INFO L93 Difference]: Finished difference Result 71 states and 71 transitions. [2018-09-30 20:32:59,790 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-09-30 20:32:59,790 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 67 [2018-09-30 20:32:59,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:32:59,791 INFO L225 Difference]: With dead ends: 71 [2018-09-30 20:32:59,791 INFO L226 Difference]: Without dead ends: 69 [2018-09-30 20:32:59,792 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 [2018-09-30 20:32:59,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-09-30 20:32:59,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-09-30 20:32:59,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-09-30 20:32:59,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-09-30 20:32:59,798 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 67 [2018-09-30 20:32:59,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:32:59,799 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-09-30 20:32:59,799 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-09-30 20:32:59,799 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-09-30 20:32:59,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-09-30 20:32:59,799 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:32:59,799 INFO L375 BasicCegarLoop]: trace histogram [64, 1, 1, 1, 1] [2018-09-30 20:32:59,800 INFO L423 AbstractCegarLoop]: === Iteration 65 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:32:59,800 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:32:59,800 INFO L82 PathProgramCache]: Analyzing trace with hash -955736028, now seen corresponding path program 64 times [2018-09-30 20:32:59,800 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:32:59,800 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:32:59,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:32:59,801 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:32:59,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:32:59,808 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:32:59,808 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:32:59,808 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 [2018-09-30 20:32:59,822 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:33:06,772 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:33:06,773 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:33:06,793 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:33:10,386 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 0 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:33:10,405 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:33:10,406 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67] total 67 [2018-09-30 20:33:10,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-09-30 20:33:10,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-09-30 20:33:10,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=4423, Unknown=0, NotChecked=0, Total=4556 [2018-09-30 20:33:10,407 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 68 states. [2018-09-30 20:33:13,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:33:13,653 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-09-30 20:33:13,654 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-09-30 20:33:13,654 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 68 [2018-09-30 20:33:13,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:33:13,655 INFO L225 Difference]: With dead ends: 72 [2018-09-30 20:33:13,655 INFO L226 Difference]: Without dead ends: 70 [2018-09-30 20:33:13,656 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 [2018-09-30 20:33:13,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-09-30 20:33:13,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-09-30 20:33:13,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-09-30 20:33:13,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2018-09-30 20:33:13,662 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 68 [2018-09-30 20:33:13,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:33:13,663 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2018-09-30 20:33:13,663 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-09-30 20:33:13,663 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2018-09-30 20:33:13,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-09-30 20:33:13,663 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:33:13,663 INFO L375 BasicCegarLoop]: trace histogram [65, 1, 1, 1, 1] [2018-09-30 20:33:13,663 INFO L423 AbstractCegarLoop]: === Iteration 66 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-30 20:33:13,664 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:33:13,664 INFO L82 PathProgramCache]: Analyzing trace with hash 436952229, now seen corresponding path program 65 times [2018-09-30 20:33:13,664 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:33:13,664 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:33:13,665 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:33:13,665 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:33:13,665 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:33:13,671 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:33:13,671 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:33:13,672 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 [2018-09-30 20:33:13,685 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown