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-d19836b [2018-09-26 21:34:55,027 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-26 21:34:55,029 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-26 21:34:55,043 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-26 21:34:55,044 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-26 21:34:55,045 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-26 21:34:55,046 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-26 21:34:55,050 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-26 21:34:55,052 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-26 21:34:55,053 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-26 21:34:55,054 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-26 21:34:55,055 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-26 21:34:55,057 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-26 21:34:55,058 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-26 21:34:55,064 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-26 21:34:55,068 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-26 21:34:55,069 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-26 21:34:55,074 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-26 21:34:55,077 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-26 21:34:55,080 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-26 21:34:55,081 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-26 21:34:55,082 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-26 21:34:55,086 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-09-26 21:34:55,098 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 [2018-09-26 21:34:55,113 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-26 21:34:55,113 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-26 21:34:55,114 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-26 21:34:55,114 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-09-26 21:34:55,115 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-09-26 21:34:55,115 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-09-26 21:34:55,115 INFO L133 SettingsManager]: * Use SBE=true [2018-09-26 21:34:55,115 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-26 21:34:55,116 INFO L133 SettingsManager]: * sizeof long=4 [2018-09-26 21:34:55,116 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-26 21:34:55,116 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-09-26 21:34:55,116 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-26 21:34:55,116 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-26 21:34:55,117 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-26 21:34:55,117 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-26 21:34:55,117 INFO L133 SettingsManager]: * sizeof long double=12 [2018-09-26 21:34:55,117 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-26 21:34:55,117 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-26 21:34:55,117 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-26 21:34:55,118 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-26 21:34:55,118 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-26 21:34:55,118 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-26 21:34:55,118 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-26 21:34:55,118 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-26 21:34:55,119 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-26 21:34:55,119 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-26 21:34:55,119 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-09-26 21:34:55,119 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-26 21:34:55,119 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-26 21:34:55,120 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-26 21:34:55,163 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-26 21:34:55,176 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-26 21:34:55,180 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-26 21:34:55,181 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-26 21:34:55,182 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-26 21:34:55,183 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/nonlinear/Mult1-Safe.bpl [2018-09-26 21:34:55,184 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/nonlinear/Mult1-Safe.bpl' [2018-09-26 21:34:55,221 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-26 21:34:55,224 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-26 21:34:55,225 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-26 21:34:55,225 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-26 21:34:55,226 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-26 21:34:55,248 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:34:55" (1/1) ... [2018-09-26 21:34:55,261 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:34:55" (1/1) ... [2018-09-26 21:34:55,266 WARN L165 Inliner]: Program contained no entry procedure! [2018-09-26 21:34:55,267 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2018-09-26 21:34:55,267 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2018-09-26 21:34:55,269 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-26 21:34:55,270 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-26 21:34:55,270 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-26 21:34:55,270 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-26 21:34:55,281 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:34:55" (1/1) ... [2018-09-26 21:34:55,282 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:34:55" (1/1) ... [2018-09-26 21:34:55,282 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:34:55" (1/1) ... [2018-09-26 21:34:55,282 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:34:55" (1/1) ... [2018-09-26 21:34:55,287 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:34:55" (1/1) ... [2018-09-26 21:34:55,294 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:34:55" (1/1) ... [2018-09-26 21:34:55,295 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:34:55" (1/1) ... [2018-09-26 21:34:55,296 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-26 21:34:55,297 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-26 21:34:55,297 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-26 21:34:55,298 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-26 21:34:55,299 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:34:55" (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 [2018-09-26 21:34:55,381 INFO L124 BoogieDeclarations]: Specification and implementation of procedure mult given in one single declaration [2018-09-26 21:34:55,381 INFO L130 BoogieDeclarations]: Found specification of procedure mult [2018-09-26 21:34:55,381 INFO L138 BoogieDeclarations]: Found implementation of procedure mult [2018-09-26 21:34:55,448 WARN L639 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2018-09-26 21:34:55,566 INFO L343 CfgBuilder]: Using library mode [2018-09-26 21:34:55,566 INFO L202 PluginConnector]: Adding new model Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.09 09:34:55 BoogieIcfgContainer [2018-09-26 21:34:55,566 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-26 21:34:55,567 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-26 21:34:55,568 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-26 21:34:55,571 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-26 21:34:55,571 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:34:55" (1/2) ... [2018-09-26 21:34:55,572 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1aa830c2 and model type Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.09 09:34:55, skipping insertion in model container [2018-09-26 21:34:55,572 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.09 09:34:55" (2/2) ... [2018-09-26 21:34:55,574 INFO L112 eAbstractionObserver]: Analyzing ICFG Mult1-Safe.bpl [2018-09-26 21:34:55,584 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-26 21:34:55,592 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-26 21:34:55,644 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-26 21:34:55,645 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-26 21:34:55,645 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-26 21:34:55,645 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-26 21:34:55,645 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-26 21:34:55,646 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-26 21:34:55,646 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-26 21:34:55,646 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-26 21:34:55,646 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-26 21:34:55,662 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-09-26 21:34:55,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-09-26 21:34:55,668 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:34:55,669 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-09-26 21:34:55,670 INFO L423 AbstractCegarLoop]: === Iteration 1 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:34:55,676 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:34:55,677 INFO L82 PathProgramCache]: Analyzing trace with hash 924708, now seen corresponding path program 1 times [2018-09-26 21:34:55,679 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:34:55,680 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:34:55,737 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:34:55,737 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:34:55,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:34:55,770 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:34:55,770 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:34:55,770 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 [2018-09-26 21:34:55,779 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:34:55,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:34:55,796 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:34:55,992 WARN L178 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-09-26 21:34:56,085 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:34:56,109 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-26 21:34:56,110 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-09-26 21:34:56,114 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-26 21:34:56,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-26 21:34:56,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-09-26 21:34:56,132 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 5 states. [2018-09-26 21:34:56,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:34:56,247 INFO L93 Difference]: Finished difference Result 10 states and 10 transitions. [2018-09-26 21:34:56,248 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-26 21:34:56,249 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 4 [2018-09-26 21:34:56,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:34:56,261 INFO L225 Difference]: With dead ends: 10 [2018-09-26 21:34:56,261 INFO L226 Difference]: Without dead ends: 6 [2018-09-26 21:34:56,265 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 [2018-09-26 21:34:56,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2018-09-26 21:34:56,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2018-09-26 21:34:56,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2018-09-26 21:34:56,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2018-09-26 21:34:56,301 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2018-09-26 21:34:56,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:34:56,302 INFO L480 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2018-09-26 21:34:56,302 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-26 21:34:56,302 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2018-09-26 21:34:56,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-09-26 21:34:56,303 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:34:56,303 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2018-09-26 21:34:56,303 INFO L423 AbstractCegarLoop]: === Iteration 2 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:34:56,303 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:34:56,304 INFO L82 PathProgramCache]: Analyzing trace with hash 28663973, now seen corresponding path program 1 times [2018-09-26 21:34:56,304 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:34:56,304 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:34:56,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:34:56,305 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:34:56,306 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:34:56,310 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:34:56,310 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:34:56,310 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 [2018-09-26 21:34:56,319 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:34:56,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:34:56,326 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:34:56,421 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:34:56,441 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:34:56,441 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2018-09-26 21:34:56,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-26 21:34:56,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-26 21:34:56,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-09-26 21:34:56,444 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand 5 states. [2018-09-26 21:34:56,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:34:56,613 INFO L93 Difference]: Finished difference Result 9 states and 9 transitions. [2018-09-26 21:34:56,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-26 21:34:56,615 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 5 [2018-09-26 21:34:56,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:34:56,615 INFO L225 Difference]: With dead ends: 9 [2018-09-26 21:34:56,616 INFO L226 Difference]: Without dead ends: 7 [2018-09-26 21:34:56,617 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 [2018-09-26 21:34:56,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-09-26 21:34:56,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-09-26 21:34:56,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-09-26 21:34:56,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-09-26 21:34:56,621 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 5 [2018-09-26 21:34:56,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:34:56,622 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-09-26 21:34:56,622 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-26 21:34:56,622 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-09-26 21:34:56,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-09-26 21:34:56,623 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:34:56,623 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-09-26 21:34:56,623 INFO L423 AbstractCegarLoop]: === Iteration 3 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:34:56,624 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:34:56,624 INFO L82 PathProgramCache]: Analyzing trace with hash 888581188, now seen corresponding path program 2 times [2018-09-26 21:34:56,624 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:34:56,624 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:34:56,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:34:56,626 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:34:56,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:34:56,634 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:34:56,634 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:34:56,634 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 [2018-09-26 21:34:56,657 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:34:56,673 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:34:56,673 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:34:56,675 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:34:56,938 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:34:56,959 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:34:56,960 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2018-09-26 21:34:56,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-26 21:34:56,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-26 21:34:56,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-26 21:34:56,961 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 6 states. [2018-09-26 21:34:57,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:34:57,030 INFO L93 Difference]: Finished difference Result 10 states and 10 transitions. [2018-09-26 21:34:57,030 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-26 21:34:57,030 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2018-09-26 21:34:57,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:34:57,031 INFO L225 Difference]: With dead ends: 10 [2018-09-26 21:34:57,031 INFO L226 Difference]: Without dead ends: 8 [2018-09-26 21:34:57,032 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-09-26 21:34:57,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-09-26 21:34:57,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-09-26 21:34:57,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-09-26 21:34:57,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-09-26 21:34:57,035 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2018-09-26 21:34:57,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:34:57,036 INFO L480 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-09-26 21:34:57,036 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-26 21:34:57,036 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-09-26 21:34:57,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-09-26 21:34:57,037 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:34:57,037 INFO L375 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1] [2018-09-26 21:34:57,037 INFO L423 AbstractCegarLoop]: === Iteration 4 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:34:57,038 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:34:57,038 INFO L82 PathProgramCache]: Analyzing trace with hash 1776211077, now seen corresponding path program 3 times [2018-09-26 21:34:57,038 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:34:57,038 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:34:57,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:34:57,040 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:34:57,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:34:57,047 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:34:57,047 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:34:57,047 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 [2018-09-26 21:34:57,065 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:34:57,078 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-09-26 21:34:57,079 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:34:57,080 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:34:57,297 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:34:57,318 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:34:57,318 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2018-09-26 21:34:57,318 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-26 21:34:57,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-26 21:34:57,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-09-26 21:34:57,319 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 7 states. [2018-09-26 21:34:57,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:34:57,425 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-09-26 21:34:57,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-26 21:34:57,425 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2018-09-26 21:34:57,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:34:57,426 INFO L225 Difference]: With dead ends: 11 [2018-09-26 21:34:57,426 INFO L226 Difference]: Without dead ends: 9 [2018-09-26 21:34:57,427 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 [2018-09-26 21:34:57,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-09-26 21:34:57,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-09-26 21:34:57,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-09-26 21:34:57,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-09-26 21:34:57,432 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2018-09-26 21:34:57,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:34:57,432 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-09-26 21:34:57,432 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-26 21:34:57,432 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-09-26 21:34:57,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-09-26 21:34:57,433 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:34:57,433 INFO L375 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2018-09-26 21:34:57,434 INFO L423 AbstractCegarLoop]: === Iteration 5 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:34:57,434 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:34:57,434 INFO L82 PathProgramCache]: Analyzing trace with hash -772033436, now seen corresponding path program 4 times [2018-09-26 21:34:57,434 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:34:57,435 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:34:57,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:34:57,436 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:34:57,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:34:57,444 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:34:57,444 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:34:57,444 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-26 21:34:57,456 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-26 21:34:57,467 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-26 21:34:57,467 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:34:57,469 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:34:57,938 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:34:57,958 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:34:57,958 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2018-09-26 21:34:57,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-26 21:34:57,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-26 21:34:57,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-09-26 21:34:57,960 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 8 states. [2018-09-26 21:34:58,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:34:58,104 INFO L93 Difference]: Finished difference Result 12 states and 12 transitions. [2018-09-26 21:34:58,104 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-26 21:34:58,105 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 8 [2018-09-26 21:34:58,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:34:58,106 INFO L225 Difference]: With dead ends: 12 [2018-09-26 21:34:58,106 INFO L226 Difference]: Without dead ends: 10 [2018-09-26 21:34:58,106 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 [2018-09-26 21:34:58,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-09-26 21:34:58,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-09-26 21:34:58,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-09-26 21:34:58,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-09-26 21:34:58,111 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 8 [2018-09-26 21:34:58,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:34:58,111 INFO L480 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2018-09-26 21:34:58,111 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-26 21:34:58,111 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2018-09-26 21:34:58,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-09-26 21:34:58,112 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:34:58,112 INFO L375 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1] [2018-09-26 21:34:58,112 INFO L423 AbstractCegarLoop]: === Iteration 6 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:34:58,113 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:34:58,113 INFO L82 PathProgramCache]: Analyzing trace with hash 1836765285, now seen corresponding path program 5 times [2018-09-26 21:34:58,113 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:34:58,113 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:34:58,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:34:58,115 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:34:58,115 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:34:58,123 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:34:58,123 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:34:58,124 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) [2018-09-26 21:34:58,139 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-26 21:34:58,157 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2018-09-26 21:34:58,157 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:34:58,159 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:34:58,305 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:34:58,325 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:34:58,326 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2018-09-26 21:34:58,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-26 21:34:58,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-26 21:34:58,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-09-26 21:34:58,327 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 9 states. [2018-09-26 21:34:58,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:34:58,450 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-09-26 21:34:58,452 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-26 21:34:58,452 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 9 [2018-09-26 21:34:58,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:34:58,453 INFO L225 Difference]: With dead ends: 13 [2018-09-26 21:34:58,453 INFO L226 Difference]: Without dead ends: 11 [2018-09-26 21:34:58,454 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 [2018-09-26 21:34:58,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-26 21:34:58,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-09-26 21:34:58,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-09-26 21:34:58,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-09-26 21:34:58,458 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2018-09-26 21:34:58,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:34:58,458 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-09-26 21:34:58,458 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-26 21:34:58,458 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-09-26 21:34:58,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-26 21:34:58,459 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:34:58,459 INFO L375 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1] [2018-09-26 21:34:58,459 INFO L423 AbstractCegarLoop]: === Iteration 7 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:34:58,460 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:34:58,460 INFO L82 PathProgramCache]: Analyzing trace with hash 1105147012, now seen corresponding path program 6 times [2018-09-26 21:34:58,460 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:34:58,460 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:34:58,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:34:58,461 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:34:58,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:34:58,470 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:34:58,470 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:34:58,471 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 [2018-09-26 21:34:58,479 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-26 21:34:58,496 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2018-09-26 21:34:58,496 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:34:58,498 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:34:58,674 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:34:58,696 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:34:58,696 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2018-09-26 21:34:58,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-26 21:34:58,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-26 21:34:58,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-09-26 21:34:58,697 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 10 states. [2018-09-26 21:34:58,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:34:58,875 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2018-09-26 21:34:58,876 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-26 21:34:58,876 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 10 [2018-09-26 21:34:58,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:34:58,877 INFO L225 Difference]: With dead ends: 14 [2018-09-26 21:34:58,877 INFO L226 Difference]: Without dead ends: 12 [2018-09-26 21:34:58,878 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 [2018-09-26 21:34:58,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-09-26 21:34:58,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-09-26 21:34:58,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-09-26 21:34:58,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-09-26 21:34:58,882 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-09-26 21:34:58,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:34:58,882 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-09-26 21:34:58,882 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-26 21:34:58,882 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-09-26 21:34:58,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-09-26 21:34:58,883 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:34:58,883 INFO L375 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1] [2018-09-26 21:34:58,883 INFO L423 AbstractCegarLoop]: === Iteration 8 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:34:58,884 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:34:58,884 INFO L82 PathProgramCache]: Analyzing trace with hash -100182971, now seen corresponding path program 7 times [2018-09-26 21:34:58,884 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:34:58,884 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:34:58,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:34:58,885 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:34:58,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:34:58,895 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:34:58,895 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:34:58,895 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 [2018-09-26 21:34:58,905 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:34:58,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:34:58,925 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:34:59,123 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:34:59,144 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:34:59,145 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2018-09-26 21:34:59,145 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-26 21:34:59,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-26 21:34:59,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-09-26 21:34:59,146 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 11 states. [2018-09-26 21:34:59,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:34:59,274 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-09-26 21:34:59,275 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-26 21:34:59,275 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 11 [2018-09-26 21:34:59,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:34:59,276 INFO L225 Difference]: With dead ends: 15 [2018-09-26 21:34:59,276 INFO L226 Difference]: Without dead ends: 13 [2018-09-26 21:34:59,277 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2018-09-26 21:34:59,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-09-26 21:34:59,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-09-26 21:34:59,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-09-26 21:34:59,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-09-26 21:34:59,281 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2018-09-26 21:34:59,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:34:59,282 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-09-26 21:34:59,282 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-26 21:34:59,282 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-09-26 21:34:59,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-09-26 21:34:59,282 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:34:59,282 INFO L375 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1] [2018-09-26 21:34:59,283 INFO L423 AbstractCegarLoop]: === Iteration 9 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:34:59,283 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:34:59,283 INFO L82 PathProgramCache]: Analyzing trace with hash 1189293220, now seen corresponding path program 8 times [2018-09-26 21:34:59,283 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:34:59,283 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:34:59,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:34:59,284 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:34:59,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:34:59,294 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:34:59,295 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:34:59,295 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 [2018-09-26 21:34:59,307 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:34:59,329 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:34:59,329 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:34:59,332 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:34:59,478 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:34:59,498 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:34:59,499 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2018-09-26 21:34:59,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-26 21:34:59,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-26 21:34:59,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-09-26 21:34:59,500 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 12 states. [2018-09-26 21:34:59,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:34:59,632 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-09-26 21:34:59,633 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-26 21:34:59,633 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 12 [2018-09-26 21:34:59,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:34:59,634 INFO L225 Difference]: With dead ends: 16 [2018-09-26 21:34:59,634 INFO L226 Difference]: Without dead ends: 14 [2018-09-26 21:34:59,635 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 [2018-09-26 21:34:59,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-09-26 21:34:59,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-09-26 21:34:59,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-09-26 21:34:59,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-09-26 21:34:59,640 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2018-09-26 21:34:59,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:34:59,640 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-09-26 21:34:59,640 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-26 21:34:59,640 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-09-26 21:34:59,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-09-26 21:34:59,641 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:34:59,641 INFO L375 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1] [2018-09-26 21:34:59,641 INFO L423 AbstractCegarLoop]: === Iteration 10 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:34:59,642 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:34:59,642 INFO L82 PathProgramCache]: Analyzing trace with hash -1786617819, now seen corresponding path program 9 times [2018-09-26 21:34:59,642 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:34:59,642 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:34:59,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:34:59,643 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:34:59,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:34:59,652 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:34:59,652 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:34:59,653 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 [2018-09-26 21:34:59,663 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:34:59,692 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-09-26 21:34:59,692 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:34:59,694 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:34:59,936 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:34:59,958 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:34:59,958 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2018-09-26 21:34:59,958 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-26 21:34:59,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-26 21:34:59,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-09-26 21:34:59,959 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 13 states. [2018-09-26 21:35:00,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:00,123 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-09-26 21:35:00,123 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-26 21:35:00,124 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 13 [2018-09-26 21:35:00,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:00,125 INFO L225 Difference]: With dead ends: 17 [2018-09-26 21:35:00,125 INFO L226 Difference]: Without dead ends: 15 [2018-09-26 21:35:00,126 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 [2018-09-26 21:35:00,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-09-26 21:35:00,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-09-26 21:35:00,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-09-26 21:35:00,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-09-26 21:35:00,131 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2018-09-26 21:35:00,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:00,131 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-09-26 21:35:00,131 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-26 21:35:00,132 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-09-26 21:35:00,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-26 21:35:00,132 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:00,132 INFO L375 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1] [2018-09-26 21:35:00,132 INFO L423 AbstractCegarLoop]: === Iteration 11 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:00,133 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:00,133 INFO L82 PathProgramCache]: Analyzing trace with hash 449420484, now seen corresponding path program 10 times [2018-09-26 21:35:00,133 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:00,133 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:00,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:00,134 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:00,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:00,143 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:00,143 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:00,143 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 [2018-09-26 21:35:00,162 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-26 21:35:00,191 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-26 21:35:00,191 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:00,193 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:00,543 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:00,570 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:00,570 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2018-09-26 21:35:00,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-26 21:35:00,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-26 21:35:00,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-09-26 21:35:00,571 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 14 states. [2018-09-26 21:35:00,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:00,901 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2018-09-26 21:35:00,902 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-26 21:35:00,902 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 14 [2018-09-26 21:35:00,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:00,903 INFO L225 Difference]: With dead ends: 18 [2018-09-26 21:35:00,903 INFO L226 Difference]: Without dead ends: 16 [2018-09-26 21:35:00,904 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2018-09-26 21:35:00,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-09-26 21:35:00,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-09-26 21:35:00,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-09-26 21:35:00,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-09-26 21:35:00,909 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2018-09-26 21:35:00,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:00,909 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-09-26 21:35:00,909 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-26 21:35:00,910 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-09-26 21:35:00,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-09-26 21:35:00,910 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:00,910 INFO L375 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1] [2018-09-26 21:35:00,911 INFO L423 AbstractCegarLoop]: === Iteration 12 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:00,911 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:00,911 INFO L82 PathProgramCache]: Analyzing trace with hash 1047131141, now seen corresponding path program 11 times [2018-09-26 21:35:00,911 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:00,911 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:00,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:00,912 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:00,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:00,923 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:00,923 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:00,923 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-26 21:35:00,933 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-26 21:35:00,967 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-09-26 21:35:00,968 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:00,970 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:01,324 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:01,345 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:01,345 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2018-09-26 21:35:01,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-26 21:35:01,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-26 21:35:01,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-09-26 21:35:01,346 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 15 states. [2018-09-26 21:35:01,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:01,572 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-09-26 21:35:01,572 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-26 21:35:01,572 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 15 [2018-09-26 21:35:01,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:01,573 INFO L225 Difference]: With dead ends: 19 [2018-09-26 21:35:01,573 INFO L226 Difference]: Without dead ends: 17 [2018-09-26 21:35:01,574 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2018-09-26 21:35:01,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-09-26 21:35:01,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-09-26 21:35:01,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-09-26 21:35:01,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-09-26 21:35:01,579 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2018-09-26 21:35:01,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:01,579 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-09-26 21:35:01,580 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-26 21:35:01,580 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-09-26 21:35:01,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-09-26 21:35:01,580 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:01,580 INFO L375 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1] [2018-09-26 21:35:01,580 INFO L423 AbstractCegarLoop]: === Iteration 13 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:01,581 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:01,581 INFO L82 PathProgramCache]: Analyzing trace with hash -1898674972, now seen corresponding path program 12 times [2018-09-26 21:35:01,581 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:01,581 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:01,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:01,582 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:01,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:01,591 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:01,591 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:01,591 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-26 21:35:01,602 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-26 21:35:01,644 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-26 21:35:01,644 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:01,648 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:02,053 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:02,075 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:02,075 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2018-09-26 21:35:02,075 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-26 21:35:02,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-26 21:35:02,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-09-26 21:35:02,076 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 16 states. [2018-09-26 21:35:02,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:02,583 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2018-09-26 21:35:02,583 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-26 21:35:02,583 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 16 [2018-09-26 21:35:02,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:02,584 INFO L225 Difference]: With dead ends: 20 [2018-09-26 21:35:02,584 INFO L226 Difference]: Without dead ends: 18 [2018-09-26 21:35:02,585 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 [2018-09-26 21:35:02,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-09-26 21:35:02,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-09-26 21:35:02,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-09-26 21:35:02,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-09-26 21:35:02,590 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2018-09-26 21:35:02,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:02,590 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-09-26 21:35:02,590 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-26 21:35:02,590 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-09-26 21:35:02,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-09-26 21:35:02,591 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:02,591 INFO L375 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1] [2018-09-26 21:35:02,591 INFO L423 AbstractCegarLoop]: === Iteration 14 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:02,591 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:02,592 INFO L82 PathProgramCache]: Analyzing trace with hash 1270616037, now seen corresponding path program 13 times [2018-09-26 21:35:02,592 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:02,592 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:02,593 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:02,593 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:02,593 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:02,603 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:02,604 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:02,604 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 [2018-09-26 21:35:02,618 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:35:02,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:35:02,665 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:03,002 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:03,024 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:03,025 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2018-09-26 21:35:03,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-26 21:35:03,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-26 21:35:03,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-09-26 21:35:03,026 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 17 states. [2018-09-26 21:35:03,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:03,552 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-09-26 21:35:03,552 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-26 21:35:03,553 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 17 [2018-09-26 21:35:03,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:03,554 INFO L225 Difference]: With dead ends: 21 [2018-09-26 21:35:03,554 INFO L226 Difference]: Without dead ends: 19 [2018-09-26 21:35:03,555 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 [2018-09-26 21:35:03,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-26 21:35:03,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-09-26 21:35:03,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-26 21:35:03,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-09-26 21:35:03,560 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2018-09-26 21:35:03,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:03,561 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-09-26 21:35:03,561 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-26 21:35:03,561 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-09-26 21:35:03,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-09-26 21:35:03,562 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:03,562 INFO L375 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1] [2018-09-26 21:35:03,562 INFO L423 AbstractCegarLoop]: === Iteration 15 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:03,562 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:03,563 INFO L82 PathProgramCache]: Analyzing trace with hash 734389508, now seen corresponding path program 14 times [2018-09-26 21:35:03,563 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:03,563 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:03,564 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:03,564 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:35:03,564 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:03,573 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:03,574 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:03,574 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 [2018-09-26 21:35:03,591 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:35:03,648 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:35:03,648 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:03,650 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:03,903 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:03,925 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:03,925 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2018-09-26 21:35:03,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-26 21:35:03,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-26 21:35:03,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-09-26 21:35:03,926 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 18 states. [2018-09-26 21:35:04,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:04,282 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-09-26 21:35:04,282 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-26 21:35:04,282 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 18 [2018-09-26 21:35:04,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:04,283 INFO L225 Difference]: With dead ends: 22 [2018-09-26 21:35:04,283 INFO L226 Difference]: Without dead ends: 20 [2018-09-26 21:35:04,284 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 [2018-09-26 21:35:04,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-09-26 21:35:04,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-09-26 21:35:04,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-09-26 21:35:04,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-09-26 21:35:04,290 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2018-09-26 21:35:04,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:04,290 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-09-26 21:35:04,290 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-26 21:35:04,290 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-09-26 21:35:04,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-09-26 21:35:04,290 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:04,291 INFO L375 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1] [2018-09-26 21:35:04,291 INFO L423 AbstractCegarLoop]: === Iteration 16 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:04,291 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:04,291 INFO L82 PathProgramCache]: Analyzing trace with hash 1291236293, now seen corresponding path program 15 times [2018-09-26 21:35:04,291 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:04,291 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:04,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:04,292 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:04,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:04,301 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:04,301 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:04,301 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 [2018-09-26 21:35:04,321 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:35:04,424 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-09-26 21:35:04,424 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:04,427 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:05,909 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:05,931 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:05,931 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2018-09-26 21:35:05,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-26 21:35:05,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-26 21:35:05,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-09-26 21:35:05,932 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 19 states. [2018-09-26 21:35:06,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:06,426 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-09-26 21:35:06,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-26 21:35:06,427 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 19 [2018-09-26 21:35:06,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:06,428 INFO L225 Difference]: With dead ends: 23 [2018-09-26 21:35:06,428 INFO L226 Difference]: Without dead ends: 21 [2018-09-26 21:35:06,428 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 [2018-09-26 21:35:06,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-09-26 21:35:06,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-09-26 21:35:06,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-09-26 21:35:06,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-09-26 21:35:06,434 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2018-09-26 21:35:06,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:06,434 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-09-26 21:35:06,434 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-26 21:35:06,434 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-09-26 21:35:06,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-26 21:35:06,435 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:06,435 INFO L375 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1] [2018-09-26 21:35:06,435 INFO L423 AbstractCegarLoop]: === Iteration 17 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:06,435 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:06,435 INFO L82 PathProgramCache]: Analyzing trace with hash 1373617444, now seen corresponding path program 16 times [2018-09-26 21:35:06,435 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:06,436 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:06,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:06,436 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:06,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:06,445 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:06,445 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:06,445 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-26 21:35:06,464 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-26 21:35:06,540 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-26 21:35:06,540 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:06,542 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:06,875 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:06,897 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:06,897 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2018-09-26 21:35:06,898 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-26 21:35:06,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-26 21:35:06,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-09-26 21:35:06,898 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 20 states. [2018-09-26 21:35:07,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:07,255 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-09-26 21:35:07,256 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-09-26 21:35:07,256 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 20 [2018-09-26 21:35:07,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:07,257 INFO L225 Difference]: With dead ends: 24 [2018-09-26 21:35:07,257 INFO L226 Difference]: Without dead ends: 22 [2018-09-26 21:35:07,258 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 [2018-09-26 21:35:07,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-09-26 21:35:07,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-09-26 21:35:07,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-09-26 21:35:07,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-09-26 21:35:07,263 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2018-09-26 21:35:07,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:07,263 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-09-26 21:35:07,263 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-26 21:35:07,264 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-09-26 21:35:07,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-09-26 21:35:07,264 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:07,264 INFO L375 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1] [2018-09-26 21:35:07,265 INFO L423 AbstractCegarLoop]: === Iteration 18 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:07,265 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:07,265 INFO L82 PathProgramCache]: Analyzing trace with hash -367534171, now seen corresponding path program 17 times [2018-09-26 21:35:07,265 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:07,265 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:07,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:07,266 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:07,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:07,275 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:07,275 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:07,275 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 [2018-09-26 21:35:07,285 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-26 21:35:07,383 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2018-09-26 21:35:07,383 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:07,386 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:08,023 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:08,043 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:08,043 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2018-09-26 21:35:08,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-09-26 21:35:08,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-09-26 21:35:08,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-09-26 21:35:08,044 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 21 states. [2018-09-26 21:35:08,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:08,451 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-09-26 21:35:08,451 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-09-26 21:35:08,451 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 21 [2018-09-26 21:35:08,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:08,453 INFO L225 Difference]: With dead ends: 25 [2018-09-26 21:35:08,453 INFO L226 Difference]: Without dead ends: 23 [2018-09-26 21:35:08,454 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2018-09-26 21:35:08,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-09-26 21:35:08,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-09-26 21:35:08,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-09-26 21:35:08,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-09-26 21:35:08,460 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2018-09-26 21:35:08,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:08,460 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-09-26 21:35:08,460 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-09-26 21:35:08,460 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-09-26 21:35:08,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-09-26 21:35:08,461 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:08,461 INFO L375 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1] [2018-09-26 21:35:08,461 INFO L423 AbstractCegarLoop]: === Iteration 19 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:08,462 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:08,462 INFO L82 PathProgramCache]: Analyzing trace with hash 1491340612, now seen corresponding path program 18 times [2018-09-26 21:35:08,462 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:08,462 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:08,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:08,463 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:08,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:08,472 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:08,472 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:08,472 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 [2018-09-26 21:35:08,489 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-26 21:35:08,602 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2018-09-26 21:35:08,602 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:08,604 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:09,086 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:09,106 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:09,107 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2018-09-26 21:35:09,107 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-09-26 21:35:09,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-09-26 21:35:09,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-09-26 21:35:09,108 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 22 states. [2018-09-26 21:35:09,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:09,510 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2018-09-26 21:35:09,510 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-09-26 21:35:09,510 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 22 [2018-09-26 21:35:09,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:09,511 INFO L225 Difference]: With dead ends: 26 [2018-09-26 21:35:09,511 INFO L226 Difference]: Without dead ends: 24 [2018-09-26 21:35:09,512 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=45, Invalid=461, Unknown=0, NotChecked=0, Total=506 [2018-09-26 21:35:09,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-09-26 21:35:09,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-09-26 21:35:09,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-09-26 21:35:09,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-09-26 21:35:09,517 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2018-09-26 21:35:09,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:09,518 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-09-26 21:35:09,518 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-09-26 21:35:09,518 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-09-26 21:35:09,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-09-26 21:35:09,519 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:09,521 INFO L375 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1] [2018-09-26 21:35:09,522 INFO L423 AbstractCegarLoop]: === Iteration 20 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:09,522 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:09,522 INFO L82 PathProgramCache]: Analyzing trace with hash -1013083259, now seen corresponding path program 19 times [2018-09-26 21:35:09,522 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:09,522 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:09,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:09,523 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:09,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:09,531 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:09,531 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:09,531 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-26 21:35:09,549 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:35:09,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:35:09,689 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:10,120 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:10,142 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:10,142 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2018-09-26 21:35:10,143 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-09-26 21:35:10,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-09-26 21:35:10,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-09-26 21:35:10,144 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 23 states. [2018-09-26 21:35:10,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:10,710 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-09-26 21:35:10,711 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-09-26 21:35:10,711 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 23 [2018-09-26 21:35:10,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:10,712 INFO L225 Difference]: With dead ends: 27 [2018-09-26 21:35:10,712 INFO L226 Difference]: Without dead ends: 25 [2018-09-26 21:35:10,713 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 [2018-09-26 21:35:10,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-09-26 21:35:10,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-09-26 21:35:10,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-09-26 21:35:10,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-09-26 21:35:10,718 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2018-09-26 21:35:10,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:10,718 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-09-26 21:35:10,718 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-09-26 21:35:10,719 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-09-26 21:35:10,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-09-26 21:35:10,719 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:10,719 INFO L375 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1] [2018-09-26 21:35:10,720 INFO L423 AbstractCegarLoop]: === Iteration 21 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:10,720 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:10,720 INFO L82 PathProgramCache]: Analyzing trace with hash -1340811932, now seen corresponding path program 20 times [2018-09-26 21:35:10,720 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:10,720 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:10,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:10,721 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:35:10,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:10,729 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:10,729 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:10,729 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 [2018-09-26 21:35:10,754 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:35:10,914 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:35:10,914 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:10,917 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:11,367 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:11,388 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:11,388 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2018-09-26 21:35:11,388 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-09-26 21:35:11,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-09-26 21:35:11,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-09-26 21:35:11,389 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 24 states. [2018-09-26 21:35:11,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:11,849 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-09-26 21:35:11,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-09-26 21:35:11,850 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 24 [2018-09-26 21:35:11,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:11,850 INFO L225 Difference]: With dead ends: 28 [2018-09-26 21:35:11,851 INFO L226 Difference]: Without dead ends: 26 [2018-09-26 21:35:11,851 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 [2018-09-26 21:35:11,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-09-26 21:35:11,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-09-26 21:35:11,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-09-26 21:35:11,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-09-26 21:35:11,857 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2018-09-26 21:35:11,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:11,857 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-09-26 21:35:11,857 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-09-26 21:35:11,857 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-09-26 21:35:11,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-09-26 21:35:11,858 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:11,858 INFO L375 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1] [2018-09-26 21:35:11,858 INFO L423 AbstractCegarLoop]: === Iteration 22 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:11,859 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:11,859 INFO L82 PathProgramCache]: Analyzing trace with hash 1384501093, now seen corresponding path program 21 times [2018-09-26 21:35:11,859 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:11,859 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:11,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:11,860 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:11,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:11,868 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:11,868 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:11,868 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 [2018-09-26 21:35:11,886 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:35:12,083 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-09-26 21:35:12,084 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:12,086 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:12,819 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:12,841 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:12,841 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2018-09-26 21:35:12,841 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-09-26 21:35:12,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-09-26 21:35:12,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-09-26 21:35:12,842 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 25 states. [2018-09-26 21:35:13,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:13,651 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-09-26 21:35:13,654 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-09-26 21:35:13,654 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 25 [2018-09-26 21:35:13,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:13,655 INFO L225 Difference]: With dead ends: 29 [2018-09-26 21:35:13,655 INFO L226 Difference]: Without dead ends: 27 [2018-09-26 21:35:13,656 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2018-09-26 21:35:13,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-26 21:35:13,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-09-26 21:35:13,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-09-26 21:35:13,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-09-26 21:35:13,660 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2018-09-26 21:35:13,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:13,660 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-09-26 21:35:13,660 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-09-26 21:35:13,661 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-09-26 21:35:13,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-09-26 21:35:13,661 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:13,661 INFO L375 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1] [2018-09-26 21:35:13,661 INFO L423 AbstractCegarLoop]: === Iteration 23 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:13,662 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:13,662 INFO L82 PathProgramCache]: Analyzing trace with hash -30141052, now seen corresponding path program 22 times [2018-09-26 21:35:13,662 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:13,662 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:13,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:13,663 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:13,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:13,670 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:13,670 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:13,670 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 [2018-09-26 21:35:13,688 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-26 21:35:13,877 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-26 21:35:13,877 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:13,880 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:14,361 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:14,392 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:14,392 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2018-09-26 21:35:14,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-09-26 21:35:14,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-09-26 21:35:14,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2018-09-26 21:35:14,393 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 26 states. [2018-09-26 21:35:15,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:15,055 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-09-26 21:35:15,055 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-09-26 21:35:15,055 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 26 [2018-09-26 21:35:15,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:15,056 INFO L225 Difference]: With dead ends: 30 [2018-09-26 21:35:15,056 INFO L226 Difference]: Without dead ends: 28 [2018-09-26 21:35:15,057 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 [2018-09-26 21:35:15,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-09-26 21:35:15,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-09-26 21:35:15,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-09-26 21:35:15,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-09-26 21:35:15,062 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2018-09-26 21:35:15,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:15,062 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-09-26 21:35:15,062 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-09-26 21:35:15,063 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-09-26 21:35:15,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-09-26 21:35:15,063 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:15,063 INFO L375 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1] [2018-09-26 21:35:15,063 INFO L423 AbstractCegarLoop]: === Iteration 24 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:15,064 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:15,064 INFO L82 PathProgramCache]: Analyzing trace with hash -934374587, now seen corresponding path program 23 times [2018-09-26 21:35:15,064 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:15,064 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:15,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:15,065 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:15,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:15,071 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:15,072 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:15,072 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) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-26 21:35:15,083 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-26 21:35:15,331 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2018-09-26 21:35:15,332 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:15,336 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:15,888 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:15,909 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:15,910 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2018-09-26 21:35:15,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-09-26 21:35:15,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-09-26 21:35:15,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2018-09-26 21:35:15,911 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 27 states. [2018-09-26 21:35:16,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:16,486 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-09-26 21:35:16,486 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-09-26 21:35:16,486 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 27 [2018-09-26 21:35:16,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:16,487 INFO L225 Difference]: With dead ends: 31 [2018-09-26 21:35:16,487 INFO L226 Difference]: Without dead ends: 29 [2018-09-26 21:35:16,488 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2018-09-26 21:35:16,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-09-26 21:35:16,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-09-26 21:35:16,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-09-26 21:35:16,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-09-26 21:35:16,494 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2018-09-26 21:35:16,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:16,494 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-09-26 21:35:16,494 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-09-26 21:35:16,494 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-09-26 21:35:16,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-09-26 21:35:16,495 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:16,495 INFO L375 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1] [2018-09-26 21:35:16,495 INFO L423 AbstractCegarLoop]: === Iteration 25 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:16,495 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:16,495 INFO L82 PathProgramCache]: Analyzing trace with hash 1099156900, now seen corresponding path program 24 times [2018-09-26 21:35:16,495 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:16,496 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:16,496 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:16,496 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:16,496 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:16,503 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:16,503 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:16,503 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 [2018-09-26 21:35:16,522 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-26 21:35:16,793 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-26 21:35:16,793 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:16,796 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:17,687 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:17,707 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:17,708 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2018-09-26 21:35:17,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-09-26 21:35:17,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-09-26 21:35:17,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2018-09-26 21:35:17,709 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 28 states. [2018-09-26 21:35:18,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:18,446 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-09-26 21:35:18,446 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-09-26 21:35:18,446 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 28 [2018-09-26 21:35:18,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:18,447 INFO L225 Difference]: With dead ends: 32 [2018-09-26 21:35:18,447 INFO L226 Difference]: Without dead ends: 30 [2018-09-26 21:35:18,448 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 [2018-09-26 21:35:18,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-09-26 21:35:18,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-09-26 21:35:18,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-09-26 21:35:18,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-09-26 21:35:18,452 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2018-09-26 21:35:18,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:18,452 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-09-26 21:35:18,452 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-09-26 21:35:18,452 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-09-26 21:35:18,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-09-26 21:35:18,453 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:18,453 INFO L375 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1] [2018-09-26 21:35:18,453 INFO L423 AbstractCegarLoop]: === Iteration 26 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:18,454 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:18,454 INFO L82 PathProgramCache]: Analyzing trace with hash -285876443, now seen corresponding path program 25 times [2018-09-26 21:35:18,454 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:18,454 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:18,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:18,455 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:18,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:18,461 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:18,461 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:18,461 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 [2018-09-26 21:35:18,479 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:35:18,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:35:18,809 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:19,333 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:19,354 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:19,354 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2018-09-26 21:35:19,355 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-09-26 21:35:19,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-09-26 21:35:19,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2018-09-26 21:35:19,356 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 29 states. [2018-09-26 21:35:19,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:19,967 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-09-26 21:35:19,968 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-09-26 21:35:19,968 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 29 [2018-09-26 21:35:19,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:19,968 INFO L225 Difference]: With dead ends: 33 [2018-09-26 21:35:19,969 INFO L226 Difference]: Without dead ends: 31 [2018-09-26 21:35:19,969 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 [2018-09-26 21:35:19,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-09-26 21:35:19,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-09-26 21:35:19,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-09-26 21:35:19,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-09-26 21:35:19,974 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2018-09-26 21:35:19,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:19,974 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-09-26 21:35:19,974 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-09-26 21:35:19,974 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-09-26 21:35:19,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-09-26 21:35:19,974 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:19,974 INFO L375 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1] [2018-09-26 21:35:19,975 INFO L423 AbstractCegarLoop]: === Iteration 27 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:19,975 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:19,975 INFO L82 PathProgramCache]: Analyzing trace with hash -272237116, now seen corresponding path program 26 times [2018-09-26 21:35:19,975 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:19,975 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:19,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:19,976 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:35:19,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:19,982 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:19,982 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:19,982 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 [2018-09-26 21:35:19,995 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:35:20,377 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:35:20,377 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:20,380 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:22,203 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:22,224 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:22,225 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2018-09-26 21:35:22,225 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-09-26 21:35:22,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-09-26 21:35:22,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2018-09-26 21:35:22,226 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 30 states. [2018-09-26 21:35:22,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:22,930 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-09-26 21:35:22,930 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-09-26 21:35:22,930 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 30 [2018-09-26 21:35:22,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:22,930 INFO L225 Difference]: With dead ends: 34 [2018-09-26 21:35:22,930 INFO L226 Difference]: Without dead ends: 32 [2018-09-26 21:35:22,931 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=61, Invalid=869, Unknown=0, NotChecked=0, Total=930 [2018-09-26 21:35:22,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-09-26 21:35:22,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-09-26 21:35:22,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-09-26 21:35:22,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-09-26 21:35:22,936 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2018-09-26 21:35:22,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:22,936 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-09-26 21:35:22,936 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-09-26 21:35:22,936 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-09-26 21:35:22,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-09-26 21:35:22,937 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:22,937 INFO L375 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1] [2018-09-26 21:35:22,937 INFO L423 AbstractCegarLoop]: === Iteration 28 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:22,937 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:22,937 INFO L82 PathProgramCache]: Analyzing trace with hash 150582021, now seen corresponding path program 27 times [2018-09-26 21:35:22,937 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:22,937 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:22,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:22,938 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:22,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:22,944 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:22,944 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:22,945 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 [2018-09-26 21:35:22,955 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:35:23,378 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-09-26 21:35:23,378 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:23,381 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:23,993 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:24,013 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:24,013 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2018-09-26 21:35:24,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-09-26 21:35:24,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-09-26 21:35:24,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2018-09-26 21:35:24,014 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 31 states. [2018-09-26 21:35:24,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:24,787 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-09-26 21:35:24,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-09-26 21:35:24,787 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 31 [2018-09-26 21:35:24,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:24,788 INFO L225 Difference]: With dead ends: 35 [2018-09-26 21:35:24,788 INFO L226 Difference]: Without dead ends: 33 [2018-09-26 21:35:24,789 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 [2018-09-26 21:35:24,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-09-26 21:35:24,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-09-26 21:35:24,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-09-26 21:35:24,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-09-26 21:35:24,794 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2018-09-26 21:35:24,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:24,795 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-09-26 21:35:24,795 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-09-26 21:35:24,795 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-09-26 21:35:24,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-09-26 21:35:24,795 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:24,795 INFO L375 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1] [2018-09-26 21:35:24,796 INFO L423 AbstractCegarLoop]: === Iteration 29 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:24,796 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:24,796 INFO L82 PathProgramCache]: Analyzing trace with hash 373073380, now seen corresponding path program 28 times [2018-09-26 21:35:24,796 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:24,796 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:24,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:24,797 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:24,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:24,803 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:24,804 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:24,804 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2018-09-26 21:35:24,821 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-26 21:35:25,333 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-26 21:35:25,333 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:25,338 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:25,949 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:25,970 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:25,970 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2018-09-26 21:35:25,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-09-26 21:35:25,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-09-26 21:35:25,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2018-09-26 21:35:25,971 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 32 states. [2018-09-26 21:35:26,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:26,728 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-09-26 21:35:26,728 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-09-26 21:35:26,728 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 32 [2018-09-26 21:35:26,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:26,729 INFO L225 Difference]: With dead ends: 36 [2018-09-26 21:35:26,729 INFO L226 Difference]: Without dead ends: 34 [2018-09-26 21:35:26,730 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 [2018-09-26 21:35:26,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-09-26 21:35:26,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-09-26 21:35:26,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-09-26 21:35:26,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-09-26 21:35:26,735 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2018-09-26 21:35:26,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:26,735 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-09-26 21:35:26,736 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-09-26 21:35:26,736 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-09-26 21:35:26,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-09-26 21:35:26,736 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:26,736 INFO L375 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1] [2018-09-26 21:35:26,736 INFO L423 AbstractCegarLoop]: === Iteration 30 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:26,737 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:26,737 INFO L82 PathProgramCache]: Analyzing trace with hash -1319629083, now seen corresponding path program 29 times [2018-09-26 21:35:26,737 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:26,737 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:26,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:26,738 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:26,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:26,744 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:26,744 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:26,744 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-26 21:35:26,759 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-26 21:35:27,290 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2018-09-26 21:35:27,291 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:27,297 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:27,985 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:28,006 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:28,006 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2018-09-26 21:35:28,006 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-09-26 21:35:28,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-09-26 21:35:28,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2018-09-26 21:35:28,007 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 33 states. [2018-09-26 21:35:28,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:28,910 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-09-26 21:35:28,910 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-09-26 21:35:28,910 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 33 [2018-09-26 21:35:28,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:28,911 INFO L225 Difference]: With dead ends: 37 [2018-09-26 21:35:28,911 INFO L226 Difference]: Without dead ends: 35 [2018-09-26 21:35:28,912 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 [2018-09-26 21:35:28,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-09-26 21:35:28,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-09-26 21:35:28,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-09-26 21:35:28,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-09-26 21:35:28,918 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2018-09-26 21:35:28,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:28,918 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-09-26 21:35:28,918 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-09-26 21:35:28,918 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-09-26 21:35:28,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-09-26 21:35:28,918 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:28,919 INFO L375 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1] [2018-09-26 21:35:28,919 INFO L423 AbstractCegarLoop]: === Iteration 31 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:28,919 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:28,919 INFO L82 PathProgramCache]: Analyzing trace with hash 2041169412, now seen corresponding path program 30 times [2018-09-26 21:35:28,919 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:28,919 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:28,920 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:28,920 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:28,920 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:28,926 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:28,926 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:28,926 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 [2018-09-26 21:35:28,944 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-26 21:35:29,491 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2018-09-26 21:35:29,491 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:29,495 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:30,201 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:30,221 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:30,222 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2018-09-26 21:35:30,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-09-26 21:35:30,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-09-26 21:35:30,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2018-09-26 21:35:30,223 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 34 states. [2018-09-26 21:35:31,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:31,091 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-09-26 21:35:31,091 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-09-26 21:35:31,091 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 34 [2018-09-26 21:35:31,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:31,092 INFO L225 Difference]: With dead ends: 38 [2018-09-26 21:35:31,092 INFO L226 Difference]: Without dead ends: 36 [2018-09-26 21:35:31,093 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=69, Invalid=1121, Unknown=0, NotChecked=0, Total=1190 [2018-09-26 21:35:31,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-09-26 21:35:31,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-09-26 21:35:31,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-09-26 21:35:31,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-09-26 21:35:31,099 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2018-09-26 21:35:31,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:31,099 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-09-26 21:35:31,099 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-09-26 21:35:31,099 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-09-26 21:35:31,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-09-26 21:35:31,100 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:31,100 INFO L375 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1] [2018-09-26 21:35:31,100 INFO L423 AbstractCegarLoop]: === Iteration 32 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:31,100 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:31,100 INFO L82 PathProgramCache]: Analyzing trace with hash -1148259643, now seen corresponding path program 31 times [2018-09-26 21:35:31,100 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:31,101 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:31,101 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:31,101 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:31,101 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:31,109 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:31,109 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:31,109 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 [2018-09-26 21:35:31,125 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:35:31,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:35:31,747 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:32,583 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:32,604 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:32,604 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2018-09-26 21:35:32,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-09-26 21:35:32,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-09-26 21:35:32,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2018-09-26 21:35:32,617 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 35 states. [2018-09-26 21:35:33,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:33,591 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-09-26 21:35:33,591 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-09-26 21:35:33,591 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 35 [2018-09-26 21:35:33,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:33,592 INFO L225 Difference]: With dead ends: 39 [2018-09-26 21:35:33,592 INFO L226 Difference]: Without dead ends: 37 [2018-09-26 21:35:33,593 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=71, Invalid=1189, Unknown=0, NotChecked=0, Total=1260 [2018-09-26 21:35:33,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-09-26 21:35:33,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-09-26 21:35:33,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-09-26 21:35:33,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-09-26 21:35:33,597 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2018-09-26 21:35:33,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:33,598 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-09-26 21:35:33,598 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-09-26 21:35:33,598 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-09-26 21:35:33,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-09-26 21:35:33,598 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:33,598 INFO L375 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1] [2018-09-26 21:35:33,598 INFO L423 AbstractCegarLoop]: === Iteration 33 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:33,599 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:33,599 INFO L82 PathProgramCache]: Analyzing trace with hash -1236312540, now seen corresponding path program 32 times [2018-09-26 21:35:33,599 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:33,599 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:33,599 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:33,600 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:35:33,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:33,604 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:33,605 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:33,605 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 [2018-09-26 21:35:33,616 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:35:34,288 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:35:34,288 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:34,293 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:35,114 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:35,134 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:35,135 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2018-09-26 21:35:35,135 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-09-26 21:35:35,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-09-26 21:35:35,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2018-09-26 21:35:35,136 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 36 states. [2018-09-26 21:35:36,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:36,084 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-09-26 21:35:36,085 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-09-26 21:35:36,085 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 36 [2018-09-26 21:35:36,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:36,085 INFO L225 Difference]: With dead ends: 40 [2018-09-26 21:35:36,086 INFO L226 Difference]: Without dead ends: 38 [2018-09-26 21:35:36,087 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=73, Invalid=1259, Unknown=0, NotChecked=0, Total=1332 [2018-09-26 21:35:36,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-09-26 21:35:36,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-09-26 21:35:36,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-09-26 21:35:36,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-09-26 21:35:36,091 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2018-09-26 21:35:36,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:36,091 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-09-26 21:35:36,091 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-09-26 21:35:36,091 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-09-26 21:35:36,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-09-26 21:35:36,092 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:36,092 INFO L375 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1] [2018-09-26 21:35:36,092 INFO L423 AbstractCegarLoop]: === Iteration 34 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:36,092 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:36,092 INFO L82 PathProgramCache]: Analyzing trace with hash 329014949, now seen corresponding path program 33 times [2018-09-26 21:35:36,092 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:36,092 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:36,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:36,093 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:36,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:36,099 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:36,099 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:36,099 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-26 21:35:36,117 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:35:36,816 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-09-26 21:35:36,816 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:36,820 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:37,658 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:37,679 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:37,679 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2018-09-26 21:35:37,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-09-26 21:35:37,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-09-26 21:35:37,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2018-09-26 21:35:37,680 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 37 states. [2018-09-26 21:35:38,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:38,725 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-09-26 21:35:38,725 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-09-26 21:35:38,725 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 37 [2018-09-26 21:35:38,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:38,726 INFO L225 Difference]: With dead ends: 41 [2018-09-26 21:35:38,726 INFO L226 Difference]: Without dead ends: 39 [2018-09-26 21:35:38,727 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=75, Invalid=1331, Unknown=0, NotChecked=0, Total=1406 [2018-09-26 21:35:38,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-09-26 21:35:38,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-09-26 21:35:38,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-09-26 21:35:38,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-09-26 21:35:38,731 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2018-09-26 21:35:38,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:38,731 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-09-26 21:35:38,731 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-09-26 21:35:38,731 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-09-26 21:35:38,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-09-26 21:35:38,732 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:38,732 INFO L375 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1] [2018-09-26 21:35:38,732 INFO L423 AbstractCegarLoop]: === Iteration 35 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:38,732 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:38,732 INFO L82 PathProgramCache]: Analyzing trace with hash 1609526852, now seen corresponding path program 34 times [2018-09-26 21:35:38,733 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:38,733 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:38,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:38,733 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:38,734 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:38,739 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:38,740 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:38,740 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 [2018-09-26 21:35:38,749 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-26 21:35:39,492 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-26 21:35:39,492 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:39,499 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:40,318 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:40,338 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:40,338 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2018-09-26 21:35:40,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-09-26 21:35:40,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-09-26 21:35:40,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2018-09-26 21:35:40,339 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 38 states. [2018-09-26 21:35:41,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:41,465 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-09-26 21:35:41,465 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-09-26 21:35:41,465 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 38 [2018-09-26 21:35:41,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:41,466 INFO L225 Difference]: With dead ends: 42 [2018-09-26 21:35:41,466 INFO L226 Difference]: Without dead ends: 40 [2018-09-26 21:35:41,467 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 [2018-09-26 21:35:41,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-09-26 21:35:41,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-09-26 21:35:41,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-09-26 21:35:41,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-09-26 21:35:41,472 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2018-09-26 21:35:41,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:41,472 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-09-26 21:35:41,472 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-09-26 21:35:41,473 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-09-26 21:35:41,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-09-26 21:35:41,473 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:41,473 INFO L375 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1] [2018-09-26 21:35:41,473 INFO L423 AbstractCegarLoop]: === Iteration 36 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:41,473 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:41,474 INFO L82 PathProgramCache]: Analyzing trace with hash -1644277115, now seen corresponding path program 35 times [2018-09-26 21:35:41,474 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:41,474 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:41,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:41,475 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:41,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:41,481 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:41,481 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:41,481 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 [2018-09-26 21:35:41,492 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-26 21:35:42,443 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2018-09-26 21:35:42,443 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:42,454 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:43,536 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:43,556 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:43,556 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2018-09-26 21:35:43,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-09-26 21:35:43,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-09-26 21:35:43,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2018-09-26 21:35:43,557 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 39 states. [2018-09-26 21:35:44,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:44,688 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-09-26 21:35:44,689 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-09-26 21:35:44,689 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 39 [2018-09-26 21:35:44,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:44,689 INFO L225 Difference]: With dead ends: 43 [2018-09-26 21:35:44,690 INFO L226 Difference]: Without dead ends: 41 [2018-09-26 21:35:44,691 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=79, Invalid=1481, Unknown=0, NotChecked=0, Total=1560 [2018-09-26 21:35:44,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-09-26 21:35:44,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-09-26 21:35:44,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-09-26 21:35:44,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-09-26 21:35:44,694 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2018-09-26 21:35:44,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:44,694 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-09-26 21:35:44,694 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-09-26 21:35:44,695 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-09-26 21:35:44,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-09-26 21:35:44,695 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:44,695 INFO L375 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1] [2018-09-26 21:35:44,695 INFO L423 AbstractCegarLoop]: === Iteration 37 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:44,695 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:44,695 INFO L82 PathProgramCache]: Analyzing trace with hash 567015012, now seen corresponding path program 36 times [2018-09-26 21:35:44,695 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:44,695 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:44,696 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:44,696 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:44,696 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:44,703 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:44,703 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:44,703 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 [2018-09-26 21:35:44,717 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-26 21:35:45,805 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-09-26 21:35:45,805 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:45,810 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:46,773 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:46,793 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:46,794 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2018-09-26 21:35:46,794 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-09-26 21:35:46,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-09-26 21:35:46,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2018-09-26 21:35:46,795 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 40 states. [2018-09-26 21:35:48,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:48,009 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-09-26 21:35:48,009 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-09-26 21:35:48,009 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 40 [2018-09-26 21:35:48,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:48,010 INFO L225 Difference]: With dead ends: 44 [2018-09-26 21:35:48,010 INFO L226 Difference]: Without dead ends: 42 [2018-09-26 21:35:48,012 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=81, Invalid=1559, Unknown=0, NotChecked=0, Total=1640 [2018-09-26 21:35:48,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-09-26 21:35:48,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-09-26 21:35:48,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-09-26 21:35:48,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-09-26 21:35:48,016 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2018-09-26 21:35:48,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:48,016 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-09-26 21:35:48,016 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-09-26 21:35:48,016 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-09-26 21:35:48,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-09-26 21:35:48,017 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:48,017 INFO L375 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1] [2018-09-26 21:35:48,017 INFO L423 AbstractCegarLoop]: === Iteration 38 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:48,017 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:48,017 INFO L82 PathProgramCache]: Analyzing trace with hash 397594213, now seen corresponding path program 37 times [2018-09-26 21:35:48,017 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:48,018 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:48,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:48,018 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:48,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:48,024 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:48,024 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:48,025 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 [2018-09-26 21:35:48,035 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:35:49,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:35:49,043 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:50,089 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:50,111 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:50,111 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2018-09-26 21:35:50,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-09-26 21:35:50,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-09-26 21:35:50,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2018-09-26 21:35:50,112 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 41 states. [2018-09-26 21:35:51,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:51,369 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-09-26 21:35:51,369 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-09-26 21:35:51,369 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 41 [2018-09-26 21:35:51,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:51,370 INFO L225 Difference]: With dead ends: 45 [2018-09-26 21:35:51,370 INFO L226 Difference]: Without dead ends: 43 [2018-09-26 21:35:51,371 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 [2018-09-26 21:35:51,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-09-26 21:35:51,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-09-26 21:35:51,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-09-26 21:35:51,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-09-26 21:35:51,376 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2018-09-26 21:35:51,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:51,376 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-09-26 21:35:51,376 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-09-26 21:35:51,376 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-09-26 21:35:51,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-09-26 21:35:51,377 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:51,377 INFO L375 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1] [2018-09-26 21:35:51,377 INFO L423 AbstractCegarLoop]: === Iteration 39 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:51,377 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:51,377 INFO L82 PathProgramCache]: Analyzing trace with hash -559483260, now seen corresponding path program 38 times [2018-09-26 21:35:51,377 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:51,378 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:51,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:51,378 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:35:51,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:51,384 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:51,384 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:51,384 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-26 21:35:51,393 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:35:52,372 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:35:52,373 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:52,380 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:53,513 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:53,533 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:53,533 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2018-09-26 21:35:53,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-09-26 21:35:53,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-09-26 21:35:53,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2018-09-26 21:35:53,535 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 42 states. [2018-09-26 21:35:55,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:55,005 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-09-26 21:35:55,006 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-09-26 21:35:55,006 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 42 [2018-09-26 21:35:55,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:55,006 INFO L225 Difference]: With dead ends: 46 [2018-09-26 21:35:55,007 INFO L226 Difference]: Without dead ends: 44 [2018-09-26 21:35:55,008 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=85, Invalid=1721, Unknown=0, NotChecked=0, Total=1806 [2018-09-26 21:35:55,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-09-26 21:35:55,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-09-26 21:35:55,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-09-26 21:35:55,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-09-26 21:35:55,011 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2018-09-26 21:35:55,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:55,011 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-09-26 21:35:55,012 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-09-26 21:35:55,012 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-09-26 21:35:55,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-09-26 21:35:55,012 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:55,012 INFO L375 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1] [2018-09-26 21:35:55,012 INFO L423 AbstractCegarLoop]: === Iteration 40 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:55,012 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:55,012 INFO L82 PathProgramCache]: Analyzing trace with hash -164113851, now seen corresponding path program 39 times [2018-09-26 21:35:55,013 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:55,013 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:55,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:55,013 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:55,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:55,019 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:55,019 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:55,019 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 [2018-09-26 21:35:55,043 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:35:56,249 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-09-26 21:35:56,250 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:35:56,254 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:35:57,291 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:35:57,311 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:35:57,311 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2018-09-26 21:35:57,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-09-26 21:35:57,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-09-26 21:35:57,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2018-09-26 21:35:57,313 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 43 states. [2018-09-26 21:35:58,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:35:58,669 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-09-26 21:35:58,670 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-09-26 21:35:58,670 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 43 [2018-09-26 21:35:58,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:35:58,671 INFO L225 Difference]: With dead ends: 47 [2018-09-26 21:35:58,671 INFO L226 Difference]: Without dead ends: 45 [2018-09-26 21:35:58,672 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 [2018-09-26 21:35:58,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-09-26 21:35:58,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-09-26 21:35:58,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-09-26 21:35:58,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-09-26 21:35:58,676 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2018-09-26 21:35:58,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:35:58,676 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-09-26 21:35:58,676 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-09-26 21:35:58,676 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-09-26 21:35:58,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-09-26 21:35:58,676 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:35:58,677 INFO L375 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1] [2018-09-26 21:35:58,677 INFO L423 AbstractCegarLoop]: === Iteration 41 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:35:58,677 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:35:58,677 INFO L82 PathProgramCache]: Analyzing trace with hash -792564060, now seen corresponding path program 40 times [2018-09-26 21:35:58,677 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:35:58,677 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:35:58,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:58,678 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:35:58,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:35:58,683 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:35:58,684 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:35:58,684 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 [2018-09-26 21:35:58,697 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-26 21:36:00,258 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-26 21:36:00,259 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:36:00,267 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:36:01,454 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:36:01,474 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:36:01,474 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2018-09-26 21:36:01,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-09-26 21:36:01,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-09-26 21:36:01,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1807, Unknown=0, NotChecked=0, Total=1892 [2018-09-26 21:36:01,476 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 44 states. [2018-09-26 21:36:02,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:36:02,991 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-09-26 21:36:02,991 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-09-26 21:36:02,991 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 44 [2018-09-26 21:36:02,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:36:02,992 INFO L225 Difference]: With dead ends: 48 [2018-09-26 21:36:02,992 INFO L226 Difference]: Without dead ends: 46 [2018-09-26 21:36:02,993 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 [2018-09-26 21:36:02,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-09-26 21:36:02,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-09-26 21:36:02,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-09-26 21:36:02,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-09-26 21:36:02,997 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2018-09-26 21:36:02,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:36:02,997 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-09-26 21:36:02,997 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-09-26 21:36:02,997 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-09-26 21:36:02,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-09-26 21:36:02,997 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:36:02,998 INFO L375 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1] [2018-09-26 21:36:02,998 INFO L423 AbstractCegarLoop]: === Iteration 42 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:36:02,998 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:36:02,998 INFO L82 PathProgramCache]: Analyzing trace with hash 1200315941, now seen corresponding path program 41 times [2018-09-26 21:36:02,998 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:36:02,998 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:36:02,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:02,999 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:36:02,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:03,005 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:36:03,005 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:36:03,005 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 [2018-09-26 21:36:03,020 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-26 21:36:04,543 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2018-09-26 21:36:04,544 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:36:04,551 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:36:05,671 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:36:05,691 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:36:05,691 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2018-09-26 21:36:05,691 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-09-26 21:36:05,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-09-26 21:36:05,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2018-09-26 21:36:05,693 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 45 states. [2018-09-26 21:36:07,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:36:07,166 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-09-26 21:36:07,166 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-09-26 21:36:07,166 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 45 [2018-09-26 21:36:07,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:36:07,167 INFO L225 Difference]: With dead ends: 49 [2018-09-26 21:36:07,167 INFO L226 Difference]: Without dead ends: 47 [2018-09-26 21:36:07,168 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 [2018-09-26 21:36:07,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-09-26 21:36:07,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-09-26 21:36:07,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-09-26 21:36:07,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-09-26 21:36:07,172 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2018-09-26 21:36:07,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:36:07,172 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-09-26 21:36:07,173 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-09-26 21:36:07,173 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-09-26 21:36:07,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-09-26 21:36:07,173 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:36:07,173 INFO L375 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1] [2018-09-26 21:36:07,173 INFO L423 AbstractCegarLoop]: === Iteration 43 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:36:07,174 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:36:07,174 INFO L82 PathProgramCache]: Analyzing trace with hash -1444913468, now seen corresponding path program 42 times [2018-09-26 21:36:07,174 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:36:07,174 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:36:07,175 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:07,175 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:36:07,175 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:07,179 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:36:07,180 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:36:07,180 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 [2018-09-26 21:36:07,188 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-26 21:36:08,952 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 22 check-sat command(s) [2018-09-26 21:36:08,953 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:36:08,958 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:36:10,188 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:36:10,208 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:36:10,209 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2018-09-26 21:36:10,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-09-26 21:36:10,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-09-26 21:36:10,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1981, Unknown=0, NotChecked=0, Total=2070 [2018-09-26 21:36:10,210 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 46 states. [2018-09-26 21:36:11,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:36:11,783 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2018-09-26 21:36:11,783 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-09-26 21:36:11,783 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 46 [2018-09-26 21:36:11,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:36:11,784 INFO L225 Difference]: With dead ends: 50 [2018-09-26 21:36:11,784 INFO L226 Difference]: Without dead ends: 48 [2018-09-26 21:36:11,785 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 [2018-09-26 21:36:11,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-09-26 21:36:11,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-09-26 21:36:11,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-09-26 21:36:11,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-09-26 21:36:11,790 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2018-09-26 21:36:11,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:36:11,790 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-09-26 21:36:11,791 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-09-26 21:36:11,791 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-09-26 21:36:11,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-09-26 21:36:11,791 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:36:11,791 INFO L375 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1] [2018-09-26 21:36:11,791 INFO L423 AbstractCegarLoop]: === Iteration 44 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:36:11,792 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:36:11,792 INFO L82 PathProgramCache]: Analyzing trace with hash -1842646523, now seen corresponding path program 43 times [2018-09-26 21:36:11,792 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:36:11,792 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:36:11,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:11,793 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:36:11,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:11,798 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:36:11,799 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:36:11,799 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 [2018-09-26 21:36:11,829 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:36:13,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:36:13,422 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:36:14,683 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:36:14,704 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:36:14,704 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2018-09-26 21:36:14,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-09-26 21:36:14,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-09-26 21:36:14,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=2071, Unknown=0, NotChecked=0, Total=2162 [2018-09-26 21:36:14,705 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 47 states. [2018-09-26 21:36:16,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:36:16,307 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-09-26 21:36:16,308 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-09-26 21:36:16,308 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 47 [2018-09-26 21:36:16,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:36:16,309 INFO L225 Difference]: With dead ends: 51 [2018-09-26 21:36:16,309 INFO L226 Difference]: Without dead ends: 49 [2018-09-26 21:36:16,310 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 [2018-09-26 21:36:16,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-09-26 21:36:16,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-09-26 21:36:16,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-09-26 21:36:16,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-09-26 21:36:16,315 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2018-09-26 21:36:16,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:36:16,315 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-09-26 21:36:16,315 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-09-26 21:36:16,315 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-09-26 21:36:16,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-09-26 21:36:16,315 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:36:16,316 INFO L375 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1] [2018-09-26 21:36:16,316 INFO L423 AbstractCegarLoop]: === Iteration 45 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:36:16,316 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:36:16,316 INFO L82 PathProgramCache]: Analyzing trace with hash -1287469340, now seen corresponding path program 44 times [2018-09-26 21:36:16,316 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:36:16,316 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:36:16,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:16,317 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:36:16,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:16,323 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:36:16,323 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:36:16,323 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 [2018-09-26 21:36:16,338 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:36:18,012 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:36:18,012 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:36:18,021 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:36:19,284 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:36:19,304 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:36:19,304 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2018-09-26 21:36:19,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-09-26 21:36:19,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-09-26 21:36:19,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=2163, Unknown=0, NotChecked=0, Total=2256 [2018-09-26 21:36:19,305 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 48 states. [2018-09-26 21:36:20,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:36:20,930 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2018-09-26 21:36:20,931 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-09-26 21:36:20,931 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 48 [2018-09-26 21:36:20,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:36:20,932 INFO L225 Difference]: With dead ends: 52 [2018-09-26 21:36:20,932 INFO L226 Difference]: Without dead ends: 50 [2018-09-26 21:36:20,932 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 [2018-09-26 21:36:20,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-09-26 21:36:20,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-09-26 21:36:20,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-09-26 21:36:20,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-09-26 21:36:20,936 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2018-09-26 21:36:20,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:36:20,936 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-09-26 21:36:20,936 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-09-26 21:36:20,936 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-09-26 21:36:20,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-09-26 21:36:20,937 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:36:20,937 INFO L375 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1] [2018-09-26 21:36:20,937 INFO L423 AbstractCegarLoop]: === Iteration 46 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:36:20,937 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:36:20,937 INFO L82 PathProgramCache]: Analyzing trace with hash -1256845851, now seen corresponding path program 45 times [2018-09-26 21:36:20,938 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:36:20,938 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:36:20,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:20,938 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:36:20,939 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:20,944 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:36:20,944 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:36:20,944 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 [2018-09-26 21:36:20,951 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:36:23,053 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-09-26 21:36:23,053 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:36:23,059 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:36:24,406 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:36:24,426 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:36:24,426 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2018-09-26 21:36:24,426 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-09-26 21:36:24,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-09-26 21:36:24,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=2257, Unknown=0, NotChecked=0, Total=2352 [2018-09-26 21:36:24,427 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 49 states. [2018-09-26 21:36:26,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:36:26,133 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-09-26 21:36:26,134 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-09-26 21:36:26,134 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 49 [2018-09-26 21:36:26,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:36:26,135 INFO L225 Difference]: With dead ends: 53 [2018-09-26 21:36:26,135 INFO L226 Difference]: Without dead ends: 51 [2018-09-26 21:36:26,135 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=99, Invalid=2351, Unknown=0, NotChecked=0, Total=2450 [2018-09-26 21:36:26,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-09-26 21:36:26,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-09-26 21:36:26,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-09-26 21:36:26,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-09-26 21:36:26,139 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2018-09-26 21:36:26,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:36:26,140 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-09-26 21:36:26,140 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-09-26 21:36:26,140 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-09-26 21:36:26,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-09-26 21:36:26,140 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:36:26,140 INFO L375 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1] [2018-09-26 21:36:26,140 INFO L423 AbstractCegarLoop]: === Iteration 47 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:36:26,141 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:36:26,141 INFO L82 PathProgramCache]: Analyzing trace with hash -307517692, now seen corresponding path program 46 times [2018-09-26 21:36:26,141 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:36:26,141 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:36:26,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:26,141 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:36:26,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:26,148 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:36:26,148 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:36:26,148 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) [2018-09-26 21:36:26,159 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-26 21:36:28,477 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-26 21:36:28,478 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:36:28,487 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:36:29,845 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:36:29,865 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:36:29,866 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2018-09-26 21:36:29,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-09-26 21:36:29,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-09-26 21:36:29,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=2353, Unknown=0, NotChecked=0, Total=2450 [2018-09-26 21:36:29,867 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 50 states. [2018-09-26 21:36:31,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:36:31,628 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-09-26 21:36:31,628 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-09-26 21:36:31,628 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 50 [2018-09-26 21:36:31,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:36:31,629 INFO L225 Difference]: With dead ends: 54 [2018-09-26 21:36:31,629 INFO L226 Difference]: Without dead ends: 52 [2018-09-26 21:36:31,630 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 [2018-09-26 21:36:31,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-09-26 21:36:31,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-09-26 21:36:31,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-09-26 21:36:31,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-09-26 21:36:31,634 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2018-09-26 21:36:31,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:36:31,634 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-09-26 21:36:31,634 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-09-26 21:36:31,634 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-09-26 21:36:31,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-09-26 21:36:31,634 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:36:31,635 INFO L375 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1] [2018-09-26 21:36:31,635 INFO L423 AbstractCegarLoop]: === Iteration 48 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:36:31,635 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:36:31,635 INFO L82 PathProgramCache]: Analyzing trace with hash -943115835, now seen corresponding path program 47 times [2018-09-26 21:36:31,635 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:36:31,635 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:36:31,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:31,636 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:36:31,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:31,642 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:36:31,642 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:36:31,642 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 [2018-09-26 21:36:31,655 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-26 21:36:34,277 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2018-09-26 21:36:34,277 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:36:34,288 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:36:35,739 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:36:35,759 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:36:35,759 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2018-09-26 21:36:35,759 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-09-26 21:36:35,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-09-26 21:36:35,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=2451, Unknown=0, NotChecked=0, Total=2550 [2018-09-26 21:36:35,760 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 51 states. [2018-09-26 21:36:37,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:36:37,590 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-09-26 21:36:37,590 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-09-26 21:36:37,590 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 51 [2018-09-26 21:36:37,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:36:37,591 INFO L225 Difference]: With dead ends: 55 [2018-09-26 21:36:37,591 INFO L226 Difference]: Without dead ends: 53 [2018-09-26 21:36:37,592 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 [2018-09-26 21:36:37,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-09-26 21:36:37,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-09-26 21:36:37,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-09-26 21:36:37,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-09-26 21:36:37,598 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2018-09-26 21:36:37,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:36:37,598 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-09-26 21:36:37,598 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-09-26 21:36:37,598 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-09-26 21:36:37,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-09-26 21:36:37,598 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:36:37,599 INFO L375 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1] [2018-09-26 21:36:37,599 INFO L423 AbstractCegarLoop]: === Iteration 49 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:36:37,599 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:36:37,599 INFO L82 PathProgramCache]: Analyzing trace with hash 828178212, now seen corresponding path program 48 times [2018-09-26 21:36:37,599 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:36:37,599 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:36:37,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:37,600 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:36:37,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:37,606 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:36:37,606 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:36:37,607 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 [2018-09-26 21:36:37,615 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-26 21:36:40,352 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2018-09-26 21:36:40,352 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:36:40,358 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:36:41,805 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:36:41,825 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:36:41,825 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2018-09-26 21:36:41,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-09-26 21:36:41,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-09-26 21:36:41,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=2551, Unknown=0, NotChecked=0, Total=2652 [2018-09-26 21:36:41,826 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 52 states. [2018-09-26 21:36:43,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:36:43,747 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2018-09-26 21:36:43,747 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-09-26 21:36:43,747 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 52 [2018-09-26 21:36:43,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:36:43,748 INFO L225 Difference]: With dead ends: 56 [2018-09-26 21:36:43,748 INFO L226 Difference]: Without dead ends: 54 [2018-09-26 21:36:43,749 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 [2018-09-26 21:36:43,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-09-26 21:36:43,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-09-26 21:36:43,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-09-26 21:36:43,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-09-26 21:36:43,753 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2018-09-26 21:36:43,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:36:43,754 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-09-26 21:36:43,754 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-09-26 21:36:43,754 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-09-26 21:36:43,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-09-26 21:36:43,754 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:36:43,754 INFO L375 BasicCegarLoop]: trace histogram [49, 1, 1, 1, 1] [2018-09-26 21:36:43,754 INFO L423 AbstractCegarLoop]: === Iteration 50 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:36:43,754 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:36:43,755 INFO L82 PathProgramCache]: Analyzing trace with hash -96281179, now seen corresponding path program 49 times [2018-09-26 21:36:43,755 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:36:43,755 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:36:43,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:43,755 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:36:43,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:43,761 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:36:43,762 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:36:43,762 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) [2018-09-26 21:36:43,776 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-26 21:36:46,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:36:46,389 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:36:47,973 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:36:47,994 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:36:47,994 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2018-09-26 21:36:47,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-09-26 21:36:47,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-09-26 21:36:47,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=2653, Unknown=0, NotChecked=0, Total=2756 [2018-09-26 21:36:47,995 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 53 states. [2018-09-26 21:36:49,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:36:49,985 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-09-26 21:36:49,986 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-09-26 21:36:49,987 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 53 [2018-09-26 21:36:49,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:36:49,987 INFO L225 Difference]: With dead ends: 57 [2018-09-26 21:36:49,988 INFO L226 Difference]: Without dead ends: 55 [2018-09-26 21:36:49,988 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=107, Invalid=2755, Unknown=0, NotChecked=0, Total=2862 [2018-09-26 21:36:49,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-09-26 21:36:49,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-09-26 21:36:49,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-09-26 21:36:49,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-09-26 21:36:49,994 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2018-09-26 21:36:49,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:36:49,994 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-09-26 21:36:49,995 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-09-26 21:36:49,995 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-09-26 21:36:49,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-09-26 21:36:49,995 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:36:49,995 INFO L375 BasicCegarLoop]: trace histogram [50, 1, 1, 1, 1] [2018-09-26 21:36:49,997 INFO L423 AbstractCegarLoop]: === Iteration 51 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:36:49,997 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:36:49,997 INFO L82 PathProgramCache]: Analyzing trace with hash 1310248772, now seen corresponding path program 50 times [2018-09-26 21:36:49,997 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:36:49,997 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:36:49,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:49,998 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:36:49,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:50,006 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:36:50,006 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:36:50,006 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 [2018-09-26 21:36:50,019 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:36:52,697 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:36:52,697 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:36:52,709 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:36:54,256 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:36:54,276 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:36:54,277 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2018-09-26 21:36:54,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-09-26 21:36:54,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-09-26 21:36:54,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=2757, Unknown=0, NotChecked=0, Total=2862 [2018-09-26 21:36:54,277 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 54 states. [2018-09-26 21:36:56,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:36:56,343 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2018-09-26 21:36:56,344 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-09-26 21:36:56,344 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 54 [2018-09-26 21:36:56,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:36:56,345 INFO L225 Difference]: With dead ends: 58 [2018-09-26 21:36:56,345 INFO L226 Difference]: Without dead ends: 56 [2018-09-26 21:36:56,346 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=109, Invalid=2861, Unknown=0, NotChecked=0, Total=2970 [2018-09-26 21:36:56,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-09-26 21:36:56,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2018-09-26 21:36:56,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-09-26 21:36:56,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-09-26 21:36:56,349 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2018-09-26 21:36:56,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:36:56,350 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-09-26 21:36:56,350 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-09-26 21:36:56,350 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-09-26 21:36:56,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-09-26 21:36:56,350 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:36:56,350 INFO L375 BasicCegarLoop]: trace histogram [51, 1, 1, 1, 1] [2018-09-26 21:36:56,351 INFO L423 AbstractCegarLoop]: === Iteration 52 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:36:56,351 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:36:56,351 INFO L82 PathProgramCache]: Analyzing trace with hash 1963004293, now seen corresponding path program 51 times [2018-09-26 21:36:56,351 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:36:56,351 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:36:56,352 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:56,352 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:36:56,352 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:36:56,358 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:36:56,358 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:36:56,358 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 [2018-09-26 21:36:56,376 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:36:59,902 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-09-26 21:36:59,902 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:36:59,909 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:37:01,510 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:37:01,531 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:37:01,531 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2018-09-26 21:37:01,531 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-09-26 21:37:01,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-09-26 21:37:01,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=2863, Unknown=0, NotChecked=0, Total=2970 [2018-09-26 21:37:01,532 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 55 states. [2018-09-26 21:37:03,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:37:03,714 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-09-26 21:37:03,714 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-09-26 21:37:03,715 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 55 [2018-09-26 21:37:03,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:37:03,715 INFO L225 Difference]: With dead ends: 59 [2018-09-26 21:37:03,716 INFO L226 Difference]: Without dead ends: 57 [2018-09-26 21:37:03,716 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=111, Invalid=2969, Unknown=0, NotChecked=0, Total=3080 [2018-09-26 21:37:03,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-09-26 21:37:03,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-09-26 21:37:03,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-09-26 21:37:03,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-09-26 21:37:03,721 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2018-09-26 21:37:03,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:37:03,721 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-09-26 21:37:03,721 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-09-26 21:37:03,721 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-09-26 21:37:03,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-09-26 21:37:03,722 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:37:03,722 INFO L375 BasicCegarLoop]: trace histogram [52, 1, 1, 1, 1] [2018-09-26 21:37:03,722 INFO L423 AbstractCegarLoop]: === Iteration 53 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:37:03,722 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:37:03,722 INFO L82 PathProgramCache]: Analyzing trace with hash 723588964, now seen corresponding path program 52 times [2018-09-26 21:37:03,722 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:37:03,722 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:37:03,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:37:03,723 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:37:03,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:37:03,729 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:37:03,729 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:37:03,729 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 [2018-09-26 21:37:03,745 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-26 21:37:06,955 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-26 21:37:06,955 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:37:06,967 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:37:08,622 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:37:08,643 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:37:08,643 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2018-09-26 21:37:08,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-09-26 21:37:08,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-09-26 21:37:08,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=2971, Unknown=0, NotChecked=0, Total=3080 [2018-09-26 21:37:08,644 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 56 states. [2018-09-26 21:37:10,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:37:10,847 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-09-26 21:37:10,847 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-09-26 21:37:10,847 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 56 [2018-09-26 21:37:10,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:37:10,848 INFO L225 Difference]: With dead ends: 60 [2018-09-26 21:37:10,848 INFO L226 Difference]: Without dead ends: 58 [2018-09-26 21:37:10,849 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 [2018-09-26 21:37:10,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-09-26 21:37:10,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-09-26 21:37:10,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-09-26 21:37:10,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2018-09-26 21:37:10,852 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2018-09-26 21:37:10,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:37:10,853 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2018-09-26 21:37:10,853 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-09-26 21:37:10,853 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2018-09-26 21:37:10,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-09-26 21:37:10,853 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:37:10,853 INFO L375 BasicCegarLoop]: trace histogram [53, 1, 1, 1, 1] [2018-09-26 21:37:10,853 INFO L423 AbstractCegarLoop]: === Iteration 54 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:37:10,853 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:37:10,854 INFO L82 PathProgramCache]: Analyzing trace with hash 956419429, now seen corresponding path program 53 times [2018-09-26 21:37:10,854 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:37:10,854 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:37:10,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:37:10,854 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:37:10,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:37:10,860 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:37:10,860 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:37:10,860 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 [2018-09-26 21:37:10,866 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-26 21:37:14,840 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 28 check-sat command(s) [2018-09-26 21:37:14,840 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:37:14,854 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:37:16,595 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:37:16,617 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:37:16,617 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2018-09-26 21:37:16,618 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-09-26 21:37:16,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-09-26 21:37:16,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=3081, Unknown=0, NotChecked=0, Total=3192 [2018-09-26 21:37:16,618 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 57 states. [2018-09-26 21:37:18,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:37:18,914 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-09-26 21:37:18,914 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-09-26 21:37:18,914 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 57 [2018-09-26 21:37:18,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:37:18,915 INFO L225 Difference]: With dead ends: 61 [2018-09-26 21:37:18,915 INFO L226 Difference]: Without dead ends: 59 [2018-09-26 21:37:18,916 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 [2018-09-26 21:37:18,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-09-26 21:37:18,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-09-26 21:37:18,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-09-26 21:37:18,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-09-26 21:37:18,920 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2018-09-26 21:37:18,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:37:18,920 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-09-26 21:37:18,920 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-09-26 21:37:18,920 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-09-26 21:37:18,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-09-26 21:37:18,921 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:37:18,921 INFO L375 BasicCegarLoop]: trace histogram [54, 1, 1, 1, 1] [2018-09-26 21:37:18,921 INFO L423 AbstractCegarLoop]: === Iteration 55 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:37:18,921 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:37:18,921 INFO L82 PathProgramCache]: Analyzing trace with hash -415770748, now seen corresponding path program 54 times [2018-09-26 21:37:18,921 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:37:18,921 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:37:18,922 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:37:18,922 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:37:18,922 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:37:18,928 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:37:18,928 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:37:18,928 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 [2018-09-26 21:37:18,944 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-26 21:37:23,256 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 28 check-sat command(s) [2018-09-26 21:37:23,256 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:37:23,264 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:37:25,047 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:37:25,068 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:37:25,068 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2018-09-26 21:37:25,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-09-26 21:37:25,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-09-26 21:37:25,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=3193, Unknown=0, NotChecked=0, Total=3306 [2018-09-26 21:37:25,069 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 58 states. [2018-09-26 21:37:27,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:37:27,461 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2018-09-26 21:37:27,461 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-09-26 21:37:27,461 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 58 [2018-09-26 21:37:27,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:37:27,462 INFO L225 Difference]: With dead ends: 62 [2018-09-26 21:37:27,462 INFO L226 Difference]: Without dead ends: 60 [2018-09-26 21:37:27,463 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=117, Invalid=3305, Unknown=0, NotChecked=0, Total=3422 [2018-09-26 21:37:27,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-09-26 21:37:27,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-09-26 21:37:27,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-09-26 21:37:27,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-09-26 21:37:27,467 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 58 [2018-09-26 21:37:27,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:37:27,467 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-09-26 21:37:27,467 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-09-26 21:37:27,468 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-09-26 21:37:27,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-09-26 21:37:27,468 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:37:27,468 INFO L375 BasicCegarLoop]: trace histogram [55, 1, 1, 1, 1] [2018-09-26 21:37:27,468 INFO L423 AbstractCegarLoop]: === Iteration 56 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:37:27,468 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:37:27,468 INFO L82 PathProgramCache]: Analyzing trace with hash -3993275, now seen corresponding path program 55 times [2018-09-26 21:37:27,469 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:37:27,469 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:37:27,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:37:27,469 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:37:27,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:37:27,476 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:37:27,476 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:37:27,477 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 [2018-09-26 21:37:27,492 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:37:31,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:37:31,180 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:37:33,139 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:37:33,159 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:37:33,159 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2018-09-26 21:37:33,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-09-26 21:37:33,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-09-26 21:37:33,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=3307, Unknown=0, NotChecked=0, Total=3422 [2018-09-26 21:37:33,160 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 59 states. [2018-09-26 21:37:35,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:37:35,613 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-09-26 21:37:35,613 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-09-26 21:37:35,613 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 59 [2018-09-26 21:37:35,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:37:35,614 INFO L225 Difference]: With dead ends: 63 [2018-09-26 21:37:35,614 INFO L226 Difference]: Without dead ends: 61 [2018-09-26 21:37:35,614 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 [2018-09-26 21:37:35,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-09-26 21:37:35,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-09-26 21:37:35,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-09-26 21:37:35,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-09-26 21:37:35,621 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 59 [2018-09-26 21:37:35,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:37:35,621 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-09-26 21:37:35,621 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-09-26 21:37:35,621 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-09-26 21:37:35,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-09-26 21:37:35,621 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:37:35,621 INFO L375 BasicCegarLoop]: trace histogram [56, 1, 1, 1, 1] [2018-09-26 21:37:35,622 INFO L423 AbstractCegarLoop]: === Iteration 57 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:37:35,622 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:37:35,622 INFO L82 PathProgramCache]: Analyzing trace with hash -123793500, now seen corresponding path program 56 times [2018-09-26 21:37:35,622 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:37:35,622 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:37:35,622 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:37:35,623 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:37:35,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:37:35,629 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:37:35,629 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:37:35,629 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-26 21:37:35,637 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:37:39,466 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:37:39,467 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:37:39,480 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:37:41,454 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:37:41,474 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:37:41,474 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2018-09-26 21:37:41,474 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-09-26 21:37:41,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-09-26 21:37:41,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=3423, Unknown=0, NotChecked=0, Total=3540 [2018-09-26 21:37:41,475 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 60 states. [2018-09-26 21:37:44,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:37:44,006 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2018-09-26 21:37:44,006 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-09-26 21:37:44,006 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 60 [2018-09-26 21:37:44,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:37:44,007 INFO L225 Difference]: With dead ends: 64 [2018-09-26 21:37:44,007 INFO L226 Difference]: Without dead ends: 62 [2018-09-26 21:37:44,008 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 [2018-09-26 21:37:44,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-09-26 21:37:44,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2018-09-26 21:37:44,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-09-26 21:37:44,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2018-09-26 21:37:44,013 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 60 [2018-09-26 21:37:44,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:37:44,013 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2018-09-26 21:37:44,013 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-09-26 21:37:44,013 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2018-09-26 21:37:44,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-09-26 21:37:44,013 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:37:44,014 INFO L375 BasicCegarLoop]: trace histogram [57, 1, 1, 1, 1] [2018-09-26 21:37:44,014 INFO L423 AbstractCegarLoop]: === Iteration 58 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:37:44,014 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:37:44,014 INFO L82 PathProgramCache]: Analyzing trace with hash 457366821, now seen corresponding path program 57 times [2018-09-26 21:37:44,014 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:37:44,014 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:37:44,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:37:44,015 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:37:44,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:37:44,019 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:37:44,019 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:37:44,019 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 [2018-09-26 21:37:44,028 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:37:49,077 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-09-26 21:37:49,077 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:37:49,085 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:37:51,309 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:37:51,330 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:37:51,330 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2018-09-26 21:37:51,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-09-26 21:37:51,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-09-26 21:37:51,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=3541, Unknown=0, NotChecked=0, Total=3660 [2018-09-26 21:37:51,331 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand 61 states. [2018-09-26 21:37:53,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:37:53,946 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2018-09-26 21:37:53,947 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-09-26 21:37:53,947 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 61 [2018-09-26 21:37:53,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:37:53,948 INFO L225 Difference]: With dead ends: 65 [2018-09-26 21:37:53,948 INFO L226 Difference]: Without dead ends: 63 [2018-09-26 21:37:53,948 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 [2018-09-26 21:37:53,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-09-26 21:37:53,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-09-26 21:37:53,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-09-26 21:37:53,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-09-26 21:37:53,953 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 61 [2018-09-26 21:37:53,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:37:53,953 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-09-26 21:37:53,953 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-09-26 21:37:53,954 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-09-26 21:37:53,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-09-26 21:37:53,954 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:37:53,954 INFO L375 BasicCegarLoop]: trace histogram [58, 1, 1, 1, 1] [2018-09-26 21:37:53,954 INFO L423 AbstractCegarLoop]: === Iteration 59 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:37:53,955 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:37:53,955 INFO L82 PathProgramCache]: Analyzing trace with hash 1293467588, now seen corresponding path program 58 times [2018-09-26 21:37:53,955 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:37:53,955 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:37:53,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:37:53,956 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:37:53,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:37:53,961 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:37:53,961 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:37:53,962 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-26 21:37:53,978 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-26 21:37:58,647 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-26 21:37:58,647 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:37:58,663 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:38:00,696 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:38:00,716 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:38:00,716 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2018-09-26 21:38:00,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-09-26 21:38:00,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-09-26 21:38:00,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=3661, Unknown=0, NotChecked=0, Total=3782 [2018-09-26 21:38:00,717 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 62 states. [2018-09-26 21:38:03,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:38:03,420 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-09-26 21:38:03,421 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-09-26 21:38:03,421 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 62 [2018-09-26 21:38:03,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:38:03,422 INFO L225 Difference]: With dead ends: 66 [2018-09-26 21:38:03,422 INFO L226 Difference]: Without dead ends: 64 [2018-09-26 21:38:03,422 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 [2018-09-26 21:38:03,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-09-26 21:38:03,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2018-09-26 21:38:03,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-09-26 21:38:03,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 64 transitions. [2018-09-26 21:38:03,426 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 64 transitions. Word has length 62 [2018-09-26 21:38:03,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:38:03,426 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 64 transitions. [2018-09-26 21:38:03,426 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-09-26 21:38:03,426 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 64 transitions. [2018-09-26 21:38:03,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-09-26 21:38:03,427 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:38:03,427 INFO L375 BasicCegarLoop]: trace histogram [59, 1, 1, 1, 1] [2018-09-26 21:38:03,427 INFO L423 AbstractCegarLoop]: === Iteration 60 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:38:03,427 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:38:03,427 INFO L82 PathProgramCache]: Analyzing trace with hash 1442787589, now seen corresponding path program 59 times [2018-09-26 21:38:03,427 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:38:03,427 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:38:03,428 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:38:03,428 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:38:03,428 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:38:03,435 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:38:03,435 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:38:03,435 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-26 21:38:03,452 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-26 21:38:09,465 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 31 check-sat command(s) [2018-09-26 21:38:09,466 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:38:09,483 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:38:11,595 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:38:11,616 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:38:11,617 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62] total 62 [2018-09-26 21:38:11,617 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-09-26 21:38:11,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-09-26 21:38:11,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=3783, Unknown=0, NotChecked=0, Total=3906 [2018-09-26 21:38:11,618 INFO L87 Difference]: Start difference. First operand 64 states and 64 transitions. Second operand 63 states. [2018-09-26 21:38:14,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:38:14,402 INFO L93 Difference]: Finished difference Result 67 states and 67 transitions. [2018-09-26 21:38:14,403 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-09-26 21:38:14,403 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 63 [2018-09-26 21:38:14,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:38:14,404 INFO L225 Difference]: With dead ends: 67 [2018-09-26 21:38:14,404 INFO L226 Difference]: Without dead ends: 65 [2018-09-26 21:38:14,404 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=127, Invalid=3905, Unknown=0, NotChecked=0, Total=4032 [2018-09-26 21:38:14,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-09-26 21:38:14,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2018-09-26 21:38:14,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-09-26 21:38:14,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2018-09-26 21:38:14,408 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 63 [2018-09-26 21:38:14,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:38:14,409 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2018-09-26 21:38:14,409 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-09-26 21:38:14,409 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2018-09-26 21:38:14,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-09-26 21:38:14,409 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:38:14,409 INFO L375 BasicCegarLoop]: trace histogram [60, 1, 1, 1, 1] [2018-09-26 21:38:14,409 INFO L423 AbstractCegarLoop]: === Iteration 61 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:38:14,410 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:38:14,410 INFO L82 PathProgramCache]: Analyzing trace with hash 1776740324, now seen corresponding path program 60 times [2018-09-26 21:38:14,410 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:38:14,410 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:38:14,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:38:14,411 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:38:14,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:38:14,417 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:38:14,418 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:38:14,418 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 [2018-09-26 21:38:14,434 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-26 21:38:20,569 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2018-09-26 21:38:20,569 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:38:20,579 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:38:22,690 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 0 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:38:22,710 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:38:22,710 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63] total 63 [2018-09-26 21:38:22,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-09-26 21:38:22,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-09-26 21:38:22,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=3907, Unknown=0, NotChecked=0, Total=4032 [2018-09-26 21:38:22,711 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 64 states. [2018-09-26 21:38:25,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:38:25,587 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2018-09-26 21:38:25,587 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-09-26 21:38:25,587 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 64 [2018-09-26 21:38:25,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:38:25,588 INFO L225 Difference]: With dead ends: 68 [2018-09-26 21:38:25,588 INFO L226 Difference]: Without dead ends: 66 [2018-09-26 21:38:25,589 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 [2018-09-26 21:38:25,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-09-26 21:38:25,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-09-26 21:38:25,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-09-26 21:38:25,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-09-26 21:38:25,593 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 64 [2018-09-26 21:38:25,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:38:25,593 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-09-26 21:38:25,593 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-09-26 21:38:25,594 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-09-26 21:38:25,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-09-26 21:38:25,594 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:38:25,594 INFO L375 BasicCegarLoop]: trace histogram [61, 1, 1, 1, 1] [2018-09-26 21:38:25,594 INFO L423 AbstractCegarLoop]: === Iteration 62 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:38:25,594 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:38:25,594 INFO L82 PathProgramCache]: Analyzing trace with hash -755626779, now seen corresponding path program 61 times [2018-09-26 21:38:25,594 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:38:25,595 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:38:25,595 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:38:25,595 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:38:25,595 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:38:25,603 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:38:25,603 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:38:25,603 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 [2018-09-26 21:38:25,618 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:38:31,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:38:31,422 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:38:33,609 INFO L134 CoverageAnalysis]: Checked inductivity of 1891 backedges. 0 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:38:33,630 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:38:33,630 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64] total 64 [2018-09-26 21:38:33,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-09-26 21:38:33,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-09-26 21:38:33,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=4033, Unknown=0, NotChecked=0, Total=4160 [2018-09-26 21:38:33,631 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 65 states. [2018-09-26 21:38:36,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:38:36,600 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-09-26 21:38:36,600 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-09-26 21:38:36,600 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 65 [2018-09-26 21:38:36,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:38:36,601 INFO L225 Difference]: With dead ends: 69 [2018-09-26 21:38:36,602 INFO L226 Difference]: Without dead ends: 67 [2018-09-26 21:38:36,602 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 [2018-09-26 21:38:36,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-09-26 21:38:36,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-09-26 21:38:36,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-09-26 21:38:36,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2018-09-26 21:38:36,608 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 65 [2018-09-26 21:38:36,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:38:36,608 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2018-09-26 21:38:36,608 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-09-26 21:38:36,608 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2018-09-26 21:38:36,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-09-26 21:38:36,609 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:38:36,609 INFO L375 BasicCegarLoop]: trace histogram [62, 1, 1, 1, 1] [2018-09-26 21:38:36,609 INFO L423 AbstractCegarLoop]: === Iteration 63 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:38:36,609 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:38:36,609 INFO L82 PathProgramCache]: Analyzing trace with hash -1949595644, now seen corresponding path program 62 times [2018-09-26 21:38:36,609 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:38:36,609 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:38:36,610 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:38:36,610 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:38:36,610 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:38:36,616 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:38:36,616 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:38:36,617 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 [2018-09-26 21:38:36,636 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:38:42,609 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:38:42,609 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:38:42,627 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:38:44,872 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:38:44,891 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:38:44,892 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65] total 65 [2018-09-26 21:38:44,892 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-09-26 21:38:44,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-09-26 21:38:44,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=4161, Unknown=0, NotChecked=0, Total=4290 [2018-09-26 21:38:44,893 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 66 states. [2018-09-26 21:38:47,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:38:47,945 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2018-09-26 21:38:47,946 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-09-26 21:38:47,946 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 66 [2018-09-26 21:38:47,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:38:47,947 INFO L225 Difference]: With dead ends: 70 [2018-09-26 21:38:47,947 INFO L226 Difference]: Without dead ends: 68 [2018-09-26 21:38:47,947 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 [2018-09-26 21:38:47,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-09-26 21:38:47,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2018-09-26 21:38:47,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-09-26 21:38:47,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2018-09-26 21:38:47,952 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 66 [2018-09-26 21:38:47,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:38:47,953 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2018-09-26 21:38:47,953 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-09-26 21:38:47,953 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2018-09-26 21:38:47,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-09-26 21:38:47,953 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:38:47,954 INFO L375 BasicCegarLoop]: trace histogram [63, 1, 1, 1, 1] [2018-09-26 21:38:47,954 INFO L423 AbstractCegarLoop]: === Iteration 64 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:38:47,954 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:38:47,954 INFO L82 PathProgramCache]: Analyzing trace with hash -307924795, now seen corresponding path program 63 times [2018-09-26 21:38:47,954 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:38:47,954 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:38:47,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:38:47,955 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:38:47,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:38:47,961 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:38:47,962 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:38:47,962 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-26 21:38:47,981 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:38:55,880 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-09-26 21:38:55,881 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:38:55,890 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:38:58,275 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:38:58,295 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:38:58,295 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66] total 66 [2018-09-26 21:38:58,296 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-09-26 21:38:58,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-09-26 21:38:58,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=4291, Unknown=0, NotChecked=0, Total=4422 [2018-09-26 21:38:58,296 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand 67 states. [2018-09-26 21:39:01,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:39:01,447 INFO L93 Difference]: Finished difference Result 71 states and 71 transitions. [2018-09-26 21:39:01,447 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-09-26 21:39:01,448 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 67 [2018-09-26 21:39:01,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:39:01,449 INFO L225 Difference]: With dead ends: 71 [2018-09-26 21:39:01,449 INFO L226 Difference]: Without dead ends: 69 [2018-09-26 21:39:01,449 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 [2018-09-26 21:39:01,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-09-26 21:39:01,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-09-26 21:39:01,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-09-26 21:39:01,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-09-26 21:39:01,455 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 67 [2018-09-26 21:39:01,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:39:01,455 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-09-26 21:39:01,455 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-09-26 21:39:01,455 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-09-26 21:39:01,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-09-26 21:39:01,456 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:39:01,456 INFO L375 BasicCegarLoop]: trace histogram [64, 1, 1, 1, 1] [2018-09-26 21:39:01,456 INFO L423 AbstractCegarLoop]: === Iteration 65 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:39:01,456 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:39:01,456 INFO L82 PathProgramCache]: Analyzing trace with hash -955736028, now seen corresponding path program 64 times [2018-09-26 21:39:01,457 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:39:01,457 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:39:01,457 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:39:01,457 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:39:01,457 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:39:01,463 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:39:01,464 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:39:01,464 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 [2018-09-26 21:39:01,478 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-26 21:39:08,423 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-26 21:39:08,424 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:39:08,443 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:39:11,817 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 0 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:39:11,838 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-26 21:39:11,839 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67] total 67 [2018-09-26 21:39:11,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-09-26 21:39:11,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-09-26 21:39:11,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=4423, Unknown=0, NotChecked=0, Total=4556 [2018-09-26 21:39:11,839 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 68 states. [2018-09-26 21:39:15,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:39:15,078 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-09-26 21:39:15,078 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-09-26 21:39:15,079 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 68 [2018-09-26 21:39:15,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:39:15,079 INFO L225 Difference]: With dead ends: 72 [2018-09-26 21:39:15,080 INFO L226 Difference]: Without dead ends: 70 [2018-09-26 21:39:15,080 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=137, Invalid=4555, Unknown=0, NotChecked=0, Total=4692 [2018-09-26 21:39:15,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-09-26 21:39:15,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-09-26 21:39:15,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-09-26 21:39:15,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2018-09-26 21:39:15,085 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 68 [2018-09-26 21:39:15,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:39:15,086 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2018-09-26 21:39:15,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-09-26 21:39:15,086 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2018-09-26 21:39:15,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-09-26 21:39:15,086 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:39:15,086 INFO L375 BasicCegarLoop]: trace histogram [65, 1, 1, 1, 1] [2018-09-26 21:39:15,086 INFO L423 AbstractCegarLoop]: === Iteration 66 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-26 21:39:15,087 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 21:39:15,087 INFO L82 PathProgramCache]: Analyzing trace with hash 436952229, now seen corresponding path program 65 times [2018-09-26 21:39:15,087 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:39:15,087 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:39:15,088 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:39:15,088 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:39:15,088 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:39:15,094 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-26 21:39:15,094 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-26 21:39:15,095 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-26 21:39:15,109 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown