/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-examples/standard_palindrome_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-23 20:31:37,002 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-23 20:31:37,005 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-23 20:31:37,024 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-23 20:31:37,051 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-23 20:31:37,053 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-23 20:31:37,055 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-23 20:31:37,056 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-23 20:31:37,059 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-23 20:31:37,060 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-23 20:31:37,062 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-23 20:31:37,067 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-23 20:31:37,071 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-23 20:31:37,076 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-23 20:31:37,077 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-23 20:31:37,078 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-23 20:31:37,080 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-23 20:31:37,091 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-23 20:31:37,092 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-23 20:31:37,093 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-23 20:31:37,094 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-23 20:31:37,124 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-23 20:31:37,125 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-23 20:31:37,133 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-23 20:31:37,133 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-23 20:31:37,133 INFO L138 SettingsManager]: * Use SBE=true [2019-11-23 20:31:37,134 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-23 20:31:37,134 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-23 20:31:37,134 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-23 20:31:37,134 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-23 20:31:37,134 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-23 20:31:37,136 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-23 20:31:37,136 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-23 20:31:37,137 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-23 20:31:37,137 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2019-11-23 20:31:37,137 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-23 20:31:37,137 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-23 20:31:37,137 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-23 20:31:37,138 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-23 20:31:37,138 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-23 20:31:37,138 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-23 20:31:37,138 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-23 20:31:37,138 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-23 20:31:37,139 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-23 20:31:37,139 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-23 20:31:37,139 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-23 20:31:37,139 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-23 20:31:37,139 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-23 20:31:37,140 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-23 20:31:37,140 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-23 20:31:37,140 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-23 20:31:37,433 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-23 20:31:37,450 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-23 20:31:37,454 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-23 20:31:37,455 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-23 20:31:37,456 INFO L275 PluginConnector]: CDTParser initialized [2019-11-23 20:31:37,457 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_palindrome_ground.i [2019-11-23 20:31:37,530 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c05114088/ab453085a0c346bf9efa36fab33095ef/FLAG58bf38db7 [2019-11-23 20:31:37,987 INFO L306 CDTParser]: Found 1 translation units. [2019-11-23 20:31:37,987 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_palindrome_ground.i [2019-11-23 20:31:37,993 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c05114088/ab453085a0c346bf9efa36fab33095ef/FLAG58bf38db7 [2019-11-23 20:31:38,416 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c05114088/ab453085a0c346bf9efa36fab33095ef [2019-11-23 20:31:38,426 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-23 20:31:38,427 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-23 20:31:38,432 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-23 20:31:38,433 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-23 20:31:38,436 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-23 20:31:38,438 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:31:38" (1/1) ... [2019-11-23 20:31:38,441 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4f8c8d72 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:38, skipping insertion in model container [2019-11-23 20:31:38,441 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:31:38" (1/1) ... [2019-11-23 20:31:38,450 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-23 20:31:38,468 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-23 20:31:38,647 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 20:31:38,652 INFO L203 MainTranslator]: Completed pre-run [2019-11-23 20:31:38,675 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 20:31:38,696 INFO L208 MainTranslator]: Completed translation [2019-11-23 20:31:38,697 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:38 WrapperNode [2019-11-23 20:31:38,697 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-23 20:31:38,698 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-23 20:31:38,698 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-23 20:31:38,698 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-23 20:31:38,707 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:38" (1/1) ... [2019-11-23 20:31:38,791 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:38" (1/1) ... [2019-11-23 20:31:38,814 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-23 20:31:38,815 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-23 20:31:38,815 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-23 20:31:38,815 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-23 20:31:38,822 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:38" (1/1) ... [2019-11-23 20:31:38,822 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:38" (1/1) ... [2019-11-23 20:31:38,825 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:38" (1/1) ... [2019-11-23 20:31:38,826 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:38" (1/1) ... [2019-11-23 20:31:38,831 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:38" (1/1) ... [2019-11-23 20:31:38,836 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:38" (1/1) ... [2019-11-23 20:31:38,837 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:38" (1/1) ... [2019-11-23 20:31:38,840 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-23 20:31:38,840 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-23 20:31:38,840 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-23 20:31:38,841 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-23 20:31:38,841 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:38" (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 [2019-11-23 20:31:38,904 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-23 20:31:38,904 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-23 20:31:38,904 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-23 20:31:38,904 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-23 20:31:38,904 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-23 20:31:38,905 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-23 20:31:39,173 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-23 20:31:39,173 INFO L284 CfgBuilder]: Removed 9 assume(true) statements. [2019-11-23 20:31:39,175 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:31:39 BoogieIcfgContainer [2019-11-23 20:31:39,176 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-23 20:31:39,185 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-23 20:31:39,185 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-23 20:31:39,192 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-23 20:31:39,193 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:31:38" (1/3) ... [2019-11-23 20:31:39,194 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46e1d0f3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:31:39, skipping insertion in model container [2019-11-23 20:31:39,194 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:38" (2/3) ... [2019-11-23 20:31:39,195 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46e1d0f3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:31:39, skipping insertion in model container [2019-11-23 20:31:39,195 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:31:39" (3/3) ... [2019-11-23 20:31:39,197 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_palindrome_ground.i [2019-11-23 20:31:39,210 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-23 20:31:39,218 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-23 20:31:39,240 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-23 20:31:39,269 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-23 20:31:39,269 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-23 20:31:39,269 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-23 20:31:39,270 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-23 20:31:39,271 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-23 20:31:39,271 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-23 20:31:39,271 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-23 20:31:39,271 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-23 20:31:39,284 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2019-11-23 20:31:39,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-23 20:31:39,290 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:31:39,291 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:31:39,292 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:31:39,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:31:39,296 INFO L82 PathProgramCache]: Analyzing trace with hash -2016449835, now seen corresponding path program 1 times [2019-11-23 20:31:39,305 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:31:39,305 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1058484158] [2019-11-23 20:31:39,305 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:31:39,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:39,446 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 20:31:39,447 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1058484158] [2019-11-23 20:31:39,448 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 20:31:39,448 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 20:31:39,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037861119] [2019-11-23 20:31:39,453 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 20:31:39,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:31:39,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 20:31:39,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 20:31:39,467 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 3 states. [2019-11-23 20:31:39,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:31:39,535 INFO L93 Difference]: Finished difference Result 36 states and 50 transitions. [2019-11-23 20:31:39,535 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 20:31:39,537 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2019-11-23 20:31:39,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:31:39,546 INFO L225 Difference]: With dead ends: 36 [2019-11-23 20:31:39,546 INFO L226 Difference]: Without dead ends: 18 [2019-11-23 20:31:39,549 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 20:31:39,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-11-23 20:31:39,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2019-11-23 20:31:39,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-11-23 20:31:39,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2019-11-23 20:31:39,580 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2019-11-23 20:31:39,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:31:39,580 INFO L462 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2019-11-23 20:31:39,581 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 20:31:39,581 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2019-11-23 20:31:39,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-23 20:31:39,582 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:31:39,582 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:31:39,583 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:31:39,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:31:39,583 INFO L82 PathProgramCache]: Analyzing trace with hash 2031054225, now seen corresponding path program 1 times [2019-11-23 20:31:39,583 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:31:39,584 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2028032034] [2019-11-23 20:31:39,584 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:31:39,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:39,647 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 20:31:39,647 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2028032034] [2019-11-23 20:31:39,648 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [905772580] [2019-11-23 20:31:39,648 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-23 20:31:39,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:39,700 INFO L255 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-23 20:31:39,706 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:31:39,735 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 20:31:39,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:31:39,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2019-11-23 20:31:39,738 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278261723] [2019-11-23 20:31:39,739 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-23 20:31:39,739 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:31:39,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-23 20:31:39,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-23 20:31:39,740 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2019-11-23 20:31:39,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:31:39,793 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2019-11-23 20:31:39,794 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-23 20:31:39,794 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2019-11-23 20:31:39,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:31:39,795 INFO L225 Difference]: With dead ends: 33 [2019-11-23 20:31:39,796 INFO L226 Difference]: Without dead ends: 22 [2019-11-23 20:31:39,798 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-23 20:31:39,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-23 20:31:39,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2019-11-23 20:31:39,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-23 20:31:39,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2019-11-23 20:31:39,809 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 13 [2019-11-23 20:31:39,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:31:39,809 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2019-11-23 20:31:39,809 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-23 20:31:39,810 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2019-11-23 20:31:39,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-23 20:31:39,812 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:31:39,813 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:31:40,016 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:31:40,017 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:31:40,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:31:40,017 INFO L82 PathProgramCache]: Analyzing trace with hash -799235507, now seen corresponding path program 2 times [2019-11-23 20:31:40,018 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:31:40,018 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198713193] [2019-11-23 20:31:40,018 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:31:40,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:40,108 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-23 20:31:40,109 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198713193] [2019-11-23 20:31:40,109 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991677284] [2019-11-23 20:31:40,109 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2019-11-23 20:31:40,152 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 20:31:40,153 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:31:40,154 INFO L255 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-23 20:31:40,155 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:31:40,168 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-23 20:31:40,169 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:31:40,169 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2019-11-23 20:31:40,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135879563] [2019-11-23 20:31:40,170 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-23 20:31:40,170 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:31:40,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-23 20:31:40,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-11-23 20:31:40,171 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2019-11-23 20:31:40,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:31:40,240 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2019-11-23 20:31:40,241 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-23 20:31:40,241 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2019-11-23 20:31:40,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:31:40,242 INFO L225 Difference]: With dead ends: 39 [2019-11-23 20:31:40,242 INFO L226 Difference]: Without dead ends: 26 [2019-11-23 20:31:40,243 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-11-23 20:31:40,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-23 20:31:40,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2019-11-23 20:31:40,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-23 20:31:40,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-11-23 20:31:40,248 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2019-11-23 20:31:40,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:31:40,249 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-11-23 20:31:40,249 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-23 20:31:40,249 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-11-23 20:31:40,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-23 20:31:40,250 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:31:40,250 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:31:40,453 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:31:40,454 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:31:40,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:31:40,454 INFO L82 PathProgramCache]: Analyzing trace with hash -1303246583, now seen corresponding path program 3 times [2019-11-23 20:31:40,455 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:31:40,455 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345191551] [2019-11-23 20:31:40,455 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:31:40,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:40,577 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-23 20:31:40,577 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345191551] [2019-11-23 20:31:40,577 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1686011625] [2019-11-23 20:31:40,578 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2019-11-23 20:31:40,629 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-23 20:31:40,629 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:31:40,630 INFO L255 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-23 20:31:40,632 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:31:40,651 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-23 20:31:40,651 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:31:40,651 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2019-11-23 20:31:40,652 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544679563] [2019-11-23 20:31:40,652 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-23 20:31:40,653 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:31:40,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-23 20:31:40,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2019-11-23 20:31:40,654 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 7 states. [2019-11-23 20:31:40,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:31:40,721 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2019-11-23 20:31:40,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-23 20:31:40,722 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2019-11-23 20:31:40,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:31:40,722 INFO L225 Difference]: With dead ends: 45 [2019-11-23 20:31:40,723 INFO L226 Difference]: Without dead ends: 30 [2019-11-23 20:31:40,723 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2019-11-23 20:31:40,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-11-23 20:31:40,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2019-11-23 20:31:40,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-23 20:31:40,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2019-11-23 20:31:40,729 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 21 [2019-11-23 20:31:40,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:31:40,729 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2019-11-23 20:31:40,729 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-23 20:31:40,730 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2019-11-23 20:31:40,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-23 20:31:40,730 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:31:40,731 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:31:40,936 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:31:40,937 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:31:40,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:31:40,938 INFO L82 PathProgramCache]: Analyzing trace with hash -318070331, now seen corresponding path program 4 times [2019-11-23 20:31:40,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:31:40,939 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879750063] [2019-11-23 20:31:40,940 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:31:40,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:41,060 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-23 20:31:41,061 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1879750063] [2019-11-23 20:31:41,061 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [490193050] [2019-11-23 20:31:41,061 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST 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 [2019-11-23 20:31:41,104 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 20:31:41,104 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:31:41,105 INFO L255 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-23 20:31:41,110 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:31:41,139 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-23 20:31:41,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:31:41,139 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2019-11-23 20:31:41,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465335460] [2019-11-23 20:31:41,143 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-23 20:31:41,144 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:31:41,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-23 20:31:41,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-11-23 20:31:41,144 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 8 states. [2019-11-23 20:31:41,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:31:41,216 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2019-11-23 20:31:41,218 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-23 20:31:41,218 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2019-11-23 20:31:41,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:31:41,219 INFO L225 Difference]: With dead ends: 51 [2019-11-23 20:31:41,219 INFO L226 Difference]: Without dead ends: 34 [2019-11-23 20:31:41,220 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-11-23 20:31:41,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-11-23 20:31:41,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2019-11-23 20:31:41,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-23 20:31:41,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2019-11-23 20:31:41,226 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 25 [2019-11-23 20:31:41,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:31:41,227 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2019-11-23 20:31:41,227 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-23 20:31:41,227 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2019-11-23 20:31:41,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-11-23 20:31:41,228 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:31:41,228 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:31:41,439 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:31:41,440 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:31:41,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:31:41,441 INFO L82 PathProgramCache]: Analyzing trace with hash 2015456385, now seen corresponding path program 5 times [2019-11-23 20:31:41,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:31:41,442 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155192883] [2019-11-23 20:31:41,442 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:31:41,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:41,527 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-23 20:31:41,527 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [155192883] [2019-11-23 20:31:41,528 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012352289] [2019-11-23 20:31:41,528 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 [2019-11-23 20:31:41,624 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-11-23 20:31:41,624 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:31:41,626 INFO L255 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-23 20:31:41,628 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:31:41,657 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-23 20:31:41,658 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:31:41,658 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2019-11-23 20:31:41,658 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956383146] [2019-11-23 20:31:41,660 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-23 20:31:41,660 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:31:41,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-23 20:31:41,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2019-11-23 20:31:41,661 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 9 states. [2019-11-23 20:31:41,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:31:41,748 INFO L93 Difference]: Finished difference Result 57 states and 62 transitions. [2019-11-23 20:31:41,750 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-23 20:31:41,750 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2019-11-23 20:31:41,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:31:41,751 INFO L225 Difference]: With dead ends: 57 [2019-11-23 20:31:41,751 INFO L226 Difference]: Without dead ends: 38 [2019-11-23 20:31:41,752 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2019-11-23 20:31:41,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-11-23 20:31:41,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2019-11-23 20:31:41,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-23 20:31:41,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2019-11-23 20:31:41,763 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 29 [2019-11-23 20:31:41,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:31:41,763 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2019-11-23 20:31:41,763 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-23 20:31:41,764 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2019-11-23 20:31:41,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-11-23 20:31:41,765 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:31:41,765 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:31:41,979 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:31:41,980 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:31:41,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:31:41,980 INFO L82 PathProgramCache]: Analyzing trace with hash -189699779, now seen corresponding path program 6 times [2019-11-23 20:31:41,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:31:41,981 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [238429788] [2019-11-23 20:31:41,981 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:31:42,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:42,075 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-23 20:31:42,076 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [238429788] [2019-11-23 20:31:42,077 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1990674643] [2019-11-23 20:31:42,077 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:31:42,182 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-23 20:31:42,182 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:31:42,184 INFO L255 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-23 20:31:42,186 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:31:42,202 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-23 20:31:42,203 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:31:42,203 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2019-11-23 20:31:42,203 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430589519] [2019-11-23 20:31:42,204 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-23 20:31:42,204 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:31:42,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-23 20:31:42,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-11-23 20:31:42,205 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 10 states. [2019-11-23 20:31:42,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:31:42,275 INFO L93 Difference]: Finished difference Result 63 states and 68 transitions. [2019-11-23 20:31:42,276 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-23 20:31:42,277 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 33 [2019-11-23 20:31:42,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:31:42,277 INFO L225 Difference]: With dead ends: 63 [2019-11-23 20:31:42,278 INFO L226 Difference]: Without dead ends: 42 [2019-11-23 20:31:42,278 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-11-23 20:31:42,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-11-23 20:31:42,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2019-11-23 20:31:42,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-11-23 20:31:42,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2019-11-23 20:31:42,293 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 33 [2019-11-23 20:31:42,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:31:42,293 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2019-11-23 20:31:42,293 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-23 20:31:42,294 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2019-11-23 20:31:42,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-11-23 20:31:42,295 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:31:42,296 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:31:42,496 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:31:42,497 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:31:42,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:31:42,498 INFO L82 PathProgramCache]: Analyzing trace with hash 760584185, now seen corresponding path program 7 times [2019-11-23 20:31:42,498 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:31:42,499 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249405053] [2019-11-23 20:31:42,499 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:31:42,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:42,627 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-11-23 20:31:42,628 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249405053] [2019-11-23 20:31:42,628 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1267810332] [2019-11-23 20:31:42,628 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY 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 [2019-11-23 20:31:42,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:42,695 INFO L255 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-23 20:31:42,698 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:31:42,729 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-11-23 20:31:42,733 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:31:42,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2019-11-23 20:31:42,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120491148] [2019-11-23 20:31:42,734 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-23 20:31:42,734 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:31:42,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-23 20:31:42,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2019-11-23 20:31:42,735 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 11 states. [2019-11-23 20:31:42,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:31:42,854 INFO L93 Difference]: Finished difference Result 69 states and 74 transitions. [2019-11-23 20:31:42,857 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-23 20:31:42,857 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 37 [2019-11-23 20:31:42,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:31:42,858 INFO L225 Difference]: With dead ends: 69 [2019-11-23 20:31:42,858 INFO L226 Difference]: Without dead ends: 46 [2019-11-23 20:31:42,859 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2019-11-23 20:31:42,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-11-23 20:31:42,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2019-11-23 20:31:42,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-11-23 20:31:42,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2019-11-23 20:31:42,865 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 37 [2019-11-23 20:31:42,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:31:42,865 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2019-11-23 20:31:42,865 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-23 20:31:42,865 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2019-11-23 20:31:42,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-11-23 20:31:42,866 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:31:42,866 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:31:43,070 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:31:43,070 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:31:43,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:31:43,071 INFO L82 PathProgramCache]: Analyzing trace with hash -1775699787, now seen corresponding path program 8 times [2019-11-23 20:31:43,071 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:31:43,071 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186651576] [2019-11-23 20:31:43,071 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:31:43,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:43,188 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-11-23 20:31:43,189 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186651576] [2019-11-23 20:31:43,189 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [785626555] [2019-11-23 20:31:43,189 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2019-11-23 20:31:43,247 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 20:31:43,248 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:31:43,249 INFO L255 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-23 20:31:43,251 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:31:43,273 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-11-23 20:31:43,273 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:31:43,273 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2019-11-23 20:31:43,274 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787714837] [2019-11-23 20:31:43,274 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-23 20:31:43,274 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:31:43,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-23 20:31:43,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2019-11-23 20:31:43,275 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 12 states. [2019-11-23 20:31:43,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:31:43,366 INFO L93 Difference]: Finished difference Result 75 states and 80 transitions. [2019-11-23 20:31:43,366 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-23 20:31:43,366 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2019-11-23 20:31:43,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:31:43,367 INFO L225 Difference]: With dead ends: 75 [2019-11-23 20:31:43,367 INFO L226 Difference]: Without dead ends: 50 [2019-11-23 20:31:43,368 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2019-11-23 20:31:43,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-11-23 20:31:43,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 48. [2019-11-23 20:31:43,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-11-23 20:31:43,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2019-11-23 20:31:43,374 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 41 [2019-11-23 20:31:43,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:31:43,374 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2019-11-23 20:31:43,374 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-23 20:31:43,375 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2019-11-23 20:31:43,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-11-23 20:31:43,375 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:31:43,376 INFO L410 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:31:43,586 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:31:43,586 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:31:43,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:31:43,587 INFO L82 PathProgramCache]: Analyzing trace with hash -859403407, now seen corresponding path program 9 times [2019-11-23 20:31:43,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:31:43,587 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811345162] [2019-11-23 20:31:43,587 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:31:43,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:43,756 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-23 20:31:43,758 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811345162] [2019-11-23 20:31:43,758 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [946581883] [2019-11-23 20:31:43,758 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2019-11-23 20:31:44,301 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-11-23 20:31:44,301 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:31:44,303 INFO L255 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-23 20:31:44,305 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:31:44,337 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-23 20:31:44,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:31:44,338 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2019-11-23 20:31:44,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761796707] [2019-11-23 20:31:44,338 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-23 20:31:44,339 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:31:44,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-23 20:31:44,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2019-11-23 20:31:44,339 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 13 states. [2019-11-23 20:31:44,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:31:44,446 INFO L93 Difference]: Finished difference Result 81 states and 86 transitions. [2019-11-23 20:31:44,446 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-23 20:31:44,447 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 45 [2019-11-23 20:31:44,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:31:44,448 INFO L225 Difference]: With dead ends: 81 [2019-11-23 20:31:44,448 INFO L226 Difference]: Without dead ends: 54 [2019-11-23 20:31:44,449 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2019-11-23 20:31:44,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-11-23 20:31:44,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2019-11-23 20:31:44,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-11-23 20:31:44,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2019-11-23 20:31:44,454 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 45 [2019-11-23 20:31:44,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:31:44,455 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2019-11-23 20:31:44,455 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-23 20:31:44,455 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2019-11-23 20:31:44,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2019-11-23 20:31:44,456 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:31:44,456 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:31:44,660 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:31:44,661 INFO L410 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:31:44,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:31:44,662 INFO L82 PathProgramCache]: Analyzing trace with hash 407457837, now seen corresponding path program 10 times [2019-11-23 20:31:44,662 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:31:44,663 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1477865832] [2019-11-23 20:31:44,663 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:31:44,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:44,780 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-11-23 20:31:44,781 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1477865832] [2019-11-23 20:31:44,781 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1545079329] [2019-11-23 20:31:44,781 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST 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 [2019-11-23 20:31:44,840 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 20:31:44,840 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:31:44,841 INFO L255 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-23 20:31:44,843 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:31:44,862 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-11-23 20:31:44,862 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:31:44,862 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2019-11-23 20:31:44,862 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792399352] [2019-11-23 20:31:44,863 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-23 20:31:44,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:31:44,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-23 20:31:44,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2019-11-23 20:31:44,864 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 14 states. [2019-11-23 20:31:44,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:31:44,959 INFO L93 Difference]: Finished difference Result 87 states and 92 transitions. [2019-11-23 20:31:44,959 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-23 20:31:44,960 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 49 [2019-11-23 20:31:44,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:31:44,960 INFO L225 Difference]: With dead ends: 87 [2019-11-23 20:31:44,961 INFO L226 Difference]: Without dead ends: 58 [2019-11-23 20:31:44,961 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2019-11-23 20:31:44,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-11-23 20:31:44,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 56. [2019-11-23 20:31:44,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-11-23 20:31:44,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2019-11-23 20:31:44,967 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 49 [2019-11-23 20:31:44,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:31:44,967 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2019-11-23 20:31:44,967 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-23 20:31:44,968 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2019-11-23 20:31:44,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-11-23 20:31:44,968 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:31:44,969 INFO L410 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:31:45,172 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:31:45,173 INFO L410 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:31:45,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:31:45,174 INFO L82 PathProgramCache]: Analyzing trace with hash -380877079, now seen corresponding path program 11 times [2019-11-23 20:31:45,174 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:31:45,175 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [891558139] [2019-11-23 20:31:45,175 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:31:45,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:45,307 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-11-23 20:31:45,308 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [891558139] [2019-11-23 20:31:45,308 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [979808842] [2019-11-23 20:31:45,308 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 [2019-11-23 20:31:46,804 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-11-23 20:31:46,805 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:31:46,809 INFO L255 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-23 20:31:46,811 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:31:46,837 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-11-23 20:31:46,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:31:46,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2019-11-23 20:31:46,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569648621] [2019-11-23 20:31:46,838 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-23 20:31:46,838 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:31:46,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-23 20:31:46,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2019-11-23 20:31:46,839 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 15 states. [2019-11-23 20:31:46,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:31:46,953 INFO L93 Difference]: Finished difference Result 93 states and 98 transitions. [2019-11-23 20:31:46,954 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-23 20:31:46,954 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 53 [2019-11-23 20:31:46,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:31:46,954 INFO L225 Difference]: With dead ends: 93 [2019-11-23 20:31:46,954 INFO L226 Difference]: Without dead ends: 62 [2019-11-23 20:31:46,955 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2019-11-23 20:31:46,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-11-23 20:31:46,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2019-11-23 20:31:46,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-11-23 20:31:46,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2019-11-23 20:31:46,960 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 53 [2019-11-23 20:31:46,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:31:46,961 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2019-11-23 20:31:46,961 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-23 20:31:46,961 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2019-11-23 20:31:46,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-11-23 20:31:46,962 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:31:46,962 INFO L410 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:31:47,162 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:31:47,163 INFO L410 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:31:47,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:31:47,164 INFO L82 PathProgramCache]: Analyzing trace with hash 1508536229, now seen corresponding path program 12 times [2019-11-23 20:31:47,164 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:31:47,165 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1623959335] [2019-11-23 20:31:47,165 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:31:47,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:47,315 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-11-23 20:31:47,315 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1623959335] [2019-11-23 20:31:47,316 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1352327793] [2019-11-23 20:31:47,316 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2019-11-23 20:31:49,656 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-11-23 20:31:49,657 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:31:49,663 INFO L255 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-23 20:31:49,666 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:31:49,691 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-11-23 20:31:49,691 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:31:49,691 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2019-11-23 20:31:49,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164179242] [2019-11-23 20:31:49,692 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-23 20:31:49,692 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:31:49,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-23 20:31:49,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2019-11-23 20:31:49,693 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 16 states. [2019-11-23 20:31:49,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:31:49,800 INFO L93 Difference]: Finished difference Result 99 states and 104 transitions. [2019-11-23 20:31:49,801 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-23 20:31:49,801 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 57 [2019-11-23 20:31:49,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:31:49,801 INFO L225 Difference]: With dead ends: 99 [2019-11-23 20:31:49,802 INFO L226 Difference]: Without dead ends: 66 [2019-11-23 20:31:49,802 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2019-11-23 20:31:49,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-11-23 20:31:49,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2019-11-23 20:31:49,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-11-23 20:31:49,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2019-11-23 20:31:49,819 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 57 [2019-11-23 20:31:49,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:31:49,819 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2019-11-23 20:31:49,819 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-23 20:31:49,819 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2019-11-23 20:31:49,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2019-11-23 20:31:49,820 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:31:49,820 INFO L410 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:31:50,021 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:31:50,021 INFO L410 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:31:50,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:31:50,022 INFO L82 PathProgramCache]: Analyzing trace with hash -1380005279, now seen corresponding path program 13 times [2019-11-23 20:31:50,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:31:50,023 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1622538055] [2019-11-23 20:31:50,023 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:31:50,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:50,184 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2019-11-23 20:31:50,185 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1622538055] [2019-11-23 20:31:50,185 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [472141231] [2019-11-23 20:31:50,185 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY 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 [2019-11-23 20:31:50,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:50,240 INFO L255 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-23 20:31:50,242 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:31:50,258 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2019-11-23 20:31:50,258 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:31:50,259 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2019-11-23 20:31:50,259 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481231727] [2019-11-23 20:31:50,259 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-23 20:31:50,259 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:31:50,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-23 20:31:50,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2019-11-23 20:31:50,260 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 17 states. [2019-11-23 20:31:50,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:31:50,387 INFO L93 Difference]: Finished difference Result 105 states and 110 transitions. [2019-11-23 20:31:50,388 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-23 20:31:50,388 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 61 [2019-11-23 20:31:50,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:31:50,389 INFO L225 Difference]: With dead ends: 105 [2019-11-23 20:31:50,389 INFO L226 Difference]: Without dead ends: 70 [2019-11-23 20:31:50,390 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2019-11-23 20:31:50,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-11-23 20:31:50,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 68. [2019-11-23 20:31:50,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-11-23 20:31:50,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2019-11-23 20:31:50,395 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 61 [2019-11-23 20:31:50,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:31:50,395 INFO L462 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2019-11-23 20:31:50,395 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-23 20:31:50,395 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2019-11-23 20:31:50,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-11-23 20:31:50,396 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:31:50,396 INFO L410 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:31:50,599 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:31:50,599 INFO L410 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:31:50,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:31:50,600 INFO L82 PathProgramCache]: Analyzing trace with hash -773564643, now seen corresponding path program 14 times [2019-11-23 20:31:50,600 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:31:50,600 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119443988] [2019-11-23 20:31:50,600 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:31:50,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:50,768 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-11-23 20:31:50,769 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119443988] [2019-11-23 20:31:50,769 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1845074219] [2019-11-23 20:31:50,769 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2019-11-23 20:31:50,838 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 20:31:50,839 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:31:50,848 INFO L255 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-23 20:31:50,851 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:31:50,896 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-11-23 20:31:50,900 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:31:50,900 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2019-11-23 20:31:50,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759963726] [2019-11-23 20:31:50,901 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-23 20:31:50,901 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:31:50,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-23 20:31:50,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2019-11-23 20:31:50,902 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 18 states. [2019-11-23 20:31:51,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:31:51,034 INFO L93 Difference]: Finished difference Result 111 states and 116 transitions. [2019-11-23 20:31:51,042 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-23 20:31:51,042 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 65 [2019-11-23 20:31:51,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:31:51,043 INFO L225 Difference]: With dead ends: 111 [2019-11-23 20:31:51,043 INFO L226 Difference]: Without dead ends: 74 [2019-11-23 20:31:51,044 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2019-11-23 20:31:51,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-11-23 20:31:51,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 72. [2019-11-23 20:31:51,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2019-11-23 20:31:51,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2019-11-23 20:31:51,050 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 65 [2019-11-23 20:31:51,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:31:51,051 INFO L462 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2019-11-23 20:31:51,051 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-23 20:31:51,051 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2019-11-23 20:31:51,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-11-23 20:31:51,052 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:31:51,052 INFO L410 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:31:51,256 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:31:51,256 INFO L410 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:31:51,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:31:51,257 INFO L82 PathProgramCache]: Analyzing trace with hash -587852327, now seen corresponding path program 15 times [2019-11-23 20:31:51,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:31:51,258 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [670345844] [2019-11-23 20:31:51,258 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:31:51,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:51,471 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2019-11-23 20:31:51,471 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [670345844] [2019-11-23 20:31:51,471 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1562173819] [2019-11-23 20:31:51,472 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2019-11-23 20:31:57,511 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-11-23 20:31:57,511 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:31:57,516 INFO L255 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-23 20:31:57,518 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:31:57,539 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2019-11-23 20:31:57,539 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:31:57,539 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2019-11-23 20:31:57,539 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18639059] [2019-11-23 20:31:57,540 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-23 20:31:57,540 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:31:57,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-23 20:31:57,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2019-11-23 20:31:57,541 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 19 states. [2019-11-23 20:31:57,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:31:57,688 INFO L93 Difference]: Finished difference Result 117 states and 122 transitions. [2019-11-23 20:31:57,689 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-23 20:31:57,689 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 69 [2019-11-23 20:31:57,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:31:57,690 INFO L225 Difference]: With dead ends: 117 [2019-11-23 20:31:57,690 INFO L226 Difference]: Without dead ends: 78 [2019-11-23 20:31:57,691 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2019-11-23 20:31:57,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-11-23 20:31:57,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2019-11-23 20:31:57,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-11-23 20:31:57,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2019-11-23 20:31:57,695 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 69 [2019-11-23 20:31:57,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:31:57,696 INFO L462 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2019-11-23 20:31:57,696 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-23 20:31:57,696 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2019-11-23 20:31:57,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2019-11-23 20:31:57,696 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:31:57,697 INFO L410 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:31:57,903 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:31:57,903 INFO L410 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:31:57,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:31:57,904 INFO L82 PathProgramCache]: Analyzing trace with hash -1894840683, now seen corresponding path program 16 times [2019-11-23 20:31:57,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:31:57,905 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2059872158] [2019-11-23 20:31:57,905 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:31:57,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:58,098 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2019-11-23 20:31:58,098 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2059872158] [2019-11-23 20:31:58,098 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2124291211] [2019-11-23 20:31:58,099 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST 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 [2019-11-23 20:31:58,159 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 20:31:58,159 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:31:58,160 INFO L255 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-23 20:31:58,162 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:31:58,198 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2019-11-23 20:31:58,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:31:58,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2019-11-23 20:31:58,201 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845660233] [2019-11-23 20:31:58,201 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-23 20:31:58,202 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:31:58,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-23 20:31:58,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2019-11-23 20:31:58,202 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 20 states. [2019-11-23 20:31:58,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:31:58,336 INFO L93 Difference]: Finished difference Result 123 states and 128 transitions. [2019-11-23 20:31:58,337 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-23 20:31:58,337 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 73 [2019-11-23 20:31:58,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:31:58,338 INFO L225 Difference]: With dead ends: 123 [2019-11-23 20:31:58,339 INFO L226 Difference]: Without dead ends: 82 [2019-11-23 20:31:58,340 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2019-11-23 20:31:58,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2019-11-23 20:31:58,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 80. [2019-11-23 20:31:58,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2019-11-23 20:31:58,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2019-11-23 20:31:58,344 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 73 [2019-11-23 20:31:58,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:31:58,344 INFO L462 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2019-11-23 20:31:58,344 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-23 20:31:58,344 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2019-11-23 20:31:58,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2019-11-23 20:31:58,345 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:31:58,345 INFO L410 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:31:58,549 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:31:58,549 INFO L410 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:31:58,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:31:58,550 INFO L82 PathProgramCache]: Analyzing trace with hash -775280303, now seen corresponding path program 17 times [2019-11-23 20:31:58,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:31:58,550 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2060810045] [2019-11-23 20:31:58,550 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:31:58,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:31:58,829 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2019-11-23 20:31:58,829 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2060810045] [2019-11-23 20:31:58,830 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [546587192] [2019-11-23 20:31:58,830 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 [2019-11-23 20:32:18,592 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-11-23 20:32:18,592 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:32:18,611 INFO L255 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-23 20:32:18,612 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:32:18,629 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2019-11-23 20:32:18,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:32:18,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2019-11-23 20:32:18,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105111595] [2019-11-23 20:32:18,630 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-23 20:32:18,631 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:32:18,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-23 20:32:18,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2019-11-23 20:32:18,631 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 21 states. [2019-11-23 20:32:18,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:32:18,768 INFO L93 Difference]: Finished difference Result 129 states and 134 transitions. [2019-11-23 20:32:18,768 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-23 20:32:18,768 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 77 [2019-11-23 20:32:18,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:32:18,769 INFO L225 Difference]: With dead ends: 129 [2019-11-23 20:32:18,769 INFO L226 Difference]: Without dead ends: 86 [2019-11-23 20:32:18,770 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2019-11-23 20:32:18,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2019-11-23 20:32:18,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 84. [2019-11-23 20:32:18,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2019-11-23 20:32:18,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2019-11-23 20:32:18,773 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 77 [2019-11-23 20:32:18,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:32:18,774 INFO L462 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2019-11-23 20:32:18,774 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-23 20:32:18,774 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2019-11-23 20:32:18,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2019-11-23 20:32:18,775 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:32:18,775 INFO L410 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:32:18,977 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:32:18,977 INFO L410 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:32:18,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:32:18,978 INFO L82 PathProgramCache]: Analyzing trace with hash 943881741, now seen corresponding path program 18 times [2019-11-23 20:32:18,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:32:18,979 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117360113] [2019-11-23 20:32:18,980 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:32:19,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:32:19,236 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2019-11-23 20:32:19,237 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117360113] [2019-11-23 20:32:19,237 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [958284615] [2019-11-23 20:32:19,237 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2019-11-23 20:32:29,478 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-11-23 20:32:29,478 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:32:29,488 INFO L255 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 20 conjunts are in the unsatisfiable core [2019-11-23 20:32:29,490 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:32:29,535 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2019-11-23 20:32:29,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:32:29,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2019-11-23 20:32:29,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383106723] [2019-11-23 20:32:29,536 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-23 20:32:29,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:32:29,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-23 20:32:29,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2019-11-23 20:32:29,540 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 22 states. [2019-11-23 20:32:29,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:32:29,660 INFO L93 Difference]: Finished difference Result 135 states and 140 transitions. [2019-11-23 20:32:29,661 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-23 20:32:29,661 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 81 [2019-11-23 20:32:29,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:32:29,662 INFO L225 Difference]: With dead ends: 135 [2019-11-23 20:32:29,662 INFO L226 Difference]: Without dead ends: 90 [2019-11-23 20:32:29,662 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2019-11-23 20:32:29,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2019-11-23 20:32:29,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 88. [2019-11-23 20:32:29,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-11-23 20:32:29,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2019-11-23 20:32:29,667 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 81 [2019-11-23 20:32:29,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:32:29,669 INFO L462 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2019-11-23 20:32:29,669 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-23 20:32:29,669 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2019-11-23 20:32:29,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2019-11-23 20:32:29,670 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:32:29,670 INFO L410 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:32:29,878 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:32:29,879 INFO L410 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:32:29,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:32:29,879 INFO L82 PathProgramCache]: Analyzing trace with hash 2131952841, now seen corresponding path program 19 times [2019-11-23 20:32:29,879 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:32:29,879 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909555304] [2019-11-23 20:32:29,879 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:32:29,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:32:30,146 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2019-11-23 20:32:30,146 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909555304] [2019-11-23 20:32:30,146 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1993987005] [2019-11-23 20:32:30,146 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY 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 [2019-11-23 20:32:30,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:32:30,212 INFO L255 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-23 20:32:30,214 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:32:30,231 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2019-11-23 20:32:30,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:32:30,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2019-11-23 20:32:30,232 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041653571] [2019-11-23 20:32:30,232 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-23 20:32:30,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:32:30,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-23 20:32:30,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2019-11-23 20:32:30,233 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 23 states. [2019-11-23 20:32:30,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:32:30,382 INFO L93 Difference]: Finished difference Result 141 states and 146 transitions. [2019-11-23 20:32:30,383 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-23 20:32:30,383 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 85 [2019-11-23 20:32:30,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:32:30,384 INFO L225 Difference]: With dead ends: 141 [2019-11-23 20:32:30,384 INFO L226 Difference]: Without dead ends: 94 [2019-11-23 20:32:30,384 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2019-11-23 20:32:30,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2019-11-23 20:32:30,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 92. [2019-11-23 20:32:30,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-11-23 20:32:30,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2019-11-23 20:32:30,388 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 85 [2019-11-23 20:32:30,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:32:30,388 INFO L462 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2019-11-23 20:32:30,389 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-23 20:32:30,389 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2019-11-23 20:32:30,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2019-11-23 20:32:30,389 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:32:30,390 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:32:30,593 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:32:30,593 INFO L410 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:32:30,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:32:30,594 INFO L82 PathProgramCache]: Analyzing trace with hash 207011205, now seen corresponding path program 20 times [2019-11-23 20:32:30,594 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:32:30,594 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869511732] [2019-11-23 20:32:30,594 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:32:30,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:32:30,885 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2019-11-23 20:32:30,886 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869511732] [2019-11-23 20:32:30,886 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [427546121] [2019-11-23 20:32:30,886 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2019-11-23 20:32:30,950 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 20:32:30,950 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:32:30,952 INFO L255 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 22 conjunts are in the unsatisfiable core [2019-11-23 20:32:30,953 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:32:30,970 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2019-11-23 20:32:30,970 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:32:30,971 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2019-11-23 20:32:30,971 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895237654] [2019-11-23 20:32:30,971 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-23 20:32:30,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:32:30,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-23 20:32:30,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2019-11-23 20:32:30,972 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand 24 states. [2019-11-23 20:32:31,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:32:31,127 INFO L93 Difference]: Finished difference Result 147 states and 152 transitions. [2019-11-23 20:32:31,127 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-23 20:32:31,128 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 89 [2019-11-23 20:32:31,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:32:31,129 INFO L225 Difference]: With dead ends: 147 [2019-11-23 20:32:31,129 INFO L226 Difference]: Without dead ends: 98 [2019-11-23 20:32:31,130 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2019-11-23 20:32:31,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2019-11-23 20:32:31,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 96. [2019-11-23 20:32:31,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2019-11-23 20:32:31,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 98 transitions. [2019-11-23 20:32:31,133 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 98 transitions. Word has length 89 [2019-11-23 20:32:31,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:32:31,133 INFO L462 AbstractCegarLoop]: Abstraction has 96 states and 98 transitions. [2019-11-23 20:32:31,133 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-23 20:32:31,133 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 98 transitions. [2019-11-23 20:32:31,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2019-11-23 20:32:31,134 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:32:31,134 INFO L410 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:32:31,339 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:32:31,339 INFO L410 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:32:31,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:32:31,340 INFO L82 PathProgramCache]: Analyzing trace with hash 1873324097, now seen corresponding path program 21 times [2019-11-23 20:32:31,341 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:32:31,341 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2019946278] [2019-11-23 20:32:31,341 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:32:31,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:32:31,635 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 441 trivial. 0 not checked. [2019-11-23 20:32:31,636 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2019946278] [2019-11-23 20:32:31,636 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [514715640] [2019-11-23 20:32:31,636 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2019-11-23 20:33:02,869 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2019-11-23 20:33:02,869 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:33:02,881 INFO L255 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 23 conjunts are in the unsatisfiable core [2019-11-23 20:33:02,882 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:33:02,918 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 441 trivial. 0 not checked. [2019-11-23 20:33:02,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:33:02,919 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2019-11-23 20:33:02,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075988753] [2019-11-23 20:33:02,920 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-23 20:33:02,920 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:33:02,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-23 20:33:02,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2019-11-23 20:33:02,921 INFO L87 Difference]: Start difference. First operand 96 states and 98 transitions. Second operand 25 states. [2019-11-23 20:33:03,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:33:03,109 INFO L93 Difference]: Finished difference Result 153 states and 158 transitions. [2019-11-23 20:33:03,111 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-23 20:33:03,111 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 93 [2019-11-23 20:33:03,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:33:03,112 INFO L225 Difference]: With dead ends: 153 [2019-11-23 20:33:03,112 INFO L226 Difference]: Without dead ends: 102 [2019-11-23 20:33:03,112 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2019-11-23 20:33:03,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2019-11-23 20:33:03,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 100. [2019-11-23 20:33:03,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2019-11-23 20:33:03,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 102 transitions. [2019-11-23 20:33:03,117 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 102 transitions. Word has length 93 [2019-11-23 20:33:03,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:33:03,117 INFO L462 AbstractCegarLoop]: Abstraction has 100 states and 102 transitions. [2019-11-23 20:33:03,118 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-23 20:33:03,118 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 102 transitions. [2019-11-23 20:33:03,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2019-11-23 20:33:03,118 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:33:03,119 INFO L410 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:33:03,322 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:33:03,322 INFO L410 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:33:03,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:33:03,323 INFO L82 PathProgramCache]: Analyzing trace with hash -500972291, now seen corresponding path program 22 times [2019-11-23 20:33:03,323 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:33:03,323 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [494665962] [2019-11-23 20:33:03,323 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:33:03,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:33:03,675 INFO L134 CoverageAnalysis]: Checked inductivity of 968 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2019-11-23 20:33:03,676 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [494665962] [2019-11-23 20:33:03,676 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [712388192] [2019-11-23 20:33:03,676 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST 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 [2019-11-23 20:33:03,748 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 20:33:03,748 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:33:03,750 INFO L255 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-23 20:33:03,752 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:33:03,792 INFO L134 CoverageAnalysis]: Checked inductivity of 968 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2019-11-23 20:33:03,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:33:03,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2019-11-23 20:33:03,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161182034] [2019-11-23 20:33:03,793 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-23 20:33:03,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:33:03,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-23 20:33:03,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2019-11-23 20:33:03,794 INFO L87 Difference]: Start difference. First operand 100 states and 102 transitions. Second operand 26 states. [2019-11-23 20:33:03,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:33:03,976 INFO L93 Difference]: Finished difference Result 159 states and 164 transitions. [2019-11-23 20:33:03,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-11-23 20:33:03,977 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 97 [2019-11-23 20:33:03,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:33:03,978 INFO L225 Difference]: With dead ends: 159 [2019-11-23 20:33:03,978 INFO L226 Difference]: Without dead ends: 106 [2019-11-23 20:33:03,979 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2019-11-23 20:33:03,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2019-11-23 20:33:03,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 104. [2019-11-23 20:33:03,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2019-11-23 20:33:03,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 106 transitions. [2019-11-23 20:33:03,982 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 106 transitions. Word has length 97 [2019-11-23 20:33:03,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:33:03,983 INFO L462 AbstractCegarLoop]: Abstraction has 104 states and 106 transitions. [2019-11-23 20:33:03,983 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-11-23 20:33:03,983 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 106 transitions. [2019-11-23 20:33:03,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2019-11-23 20:33:03,984 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:33:03,984 INFO L410 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:33:04,187 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:33:04,188 INFO L410 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:33:04,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:33:04,189 INFO L82 PathProgramCache]: Analyzing trace with hash -966585415, now seen corresponding path program 23 times [2019-11-23 20:33:04,189 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:33:04,189 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926828962] [2019-11-23 20:33:04,189 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:33:04,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:33:04,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2019-11-23 20:33:04,597 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926828962] [2019-11-23 20:33:04,597 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1655396664] [2019-11-23 20:33:04,597 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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