java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/vogal-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 23:17:04,088 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 23:17:04,090 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 23:17:04,105 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 23:17:04,106 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 23:17:04,108 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 23:17:04,110 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 23:17:04,119 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 23:17:04,121 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 23:17:04,122 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 23:17:04,122 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 23:17:04,124 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 23:17:04,124 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 23:17:04,125 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 23:17:04,126 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 23:17:04,127 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 23:17:04,128 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 23:17:04,129 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 23:17:04,130 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 23:17:04,132 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 23:17:04,133 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 23:17:04,134 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 23:17:04,135 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 23:17:04,136 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 23:17:04,138 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 23:17:04,142 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 23:17:04,143 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 23:17:04,143 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 23:17:04,146 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 23:17:04,147 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 23:17:04,147 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 23:17:04,148 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 23:17:04,148 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 23:17:04,148 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 23:17:04,152 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 23:17:04,153 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 23:17:04,153 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 [2019-10-14 23:17:04,173 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 23:17:04,173 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 23:17:04,174 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 23:17:04,175 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 23:17:04,175 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 23:17:04,176 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 23:17:04,176 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 23:17:04,176 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 23:17:04,176 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 23:17:04,176 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 23:17:04,177 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 23:17:04,177 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 23:17:04,177 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 23:17:04,177 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 23:17:04,177 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 23:17:04,177 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 23:17:04,178 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 23:17:04,178 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 23:17:04,179 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 23:17:04,179 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 23:17:04,180 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 23:17:04,180 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 23:17:04,180 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 23:17:04,180 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 23:17:04,181 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 23:17:04,181 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 23:17:04,181 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 23:17:04,181 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 23:17:04,181 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 23:17:04,464 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 23:17:04,485 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 23:17:04,488 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 23:17:04,490 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 23:17:04,490 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 23:17:04,491 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/vogal-2.i [2019-10-14 23:17:04,567 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34e4e79b7/f3b4390090814bef96b924d651428a72/FLAG81096d708 [2019-10-14 23:17:05,028 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 23:17:05,029 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/vogal-2.i [2019-10-14 23:17:05,037 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34e4e79b7/f3b4390090814bef96b924d651428a72/FLAG81096d708 [2019-10-14 23:17:05,417 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34e4e79b7/f3b4390090814bef96b924d651428a72 [2019-10-14 23:17:05,428 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 23:17:05,430 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 23:17:05,431 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 23:17:05,431 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 23:17:05,435 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 23:17:05,436 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 11:17:05" (1/1) ... [2019-10-14 23:17:05,439 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4c9fb768 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:05, skipping insertion in model container [2019-10-14 23:17:05,439 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 11:17:05" (1/1) ... [2019-10-14 23:17:05,447 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 23:17:05,470 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 23:17:05,667 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 23:17:05,671 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 23:17:05,699 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 23:17:05,800 INFO L192 MainTranslator]: Completed translation [2019-10-14 23:17:05,801 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:05 WrapperNode [2019-10-14 23:17:05,801 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 23:17:05,802 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 23:17:05,802 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 23:17:05,802 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 23:17:05,812 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:05" (1/1) ... [2019-10-14 23:17:05,812 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:05" (1/1) ... [2019-10-14 23:17:05,826 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:05" (1/1) ... [2019-10-14 23:17:05,826 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:05" (1/1) ... [2019-10-14 23:17:05,844 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:05" (1/1) ... [2019-10-14 23:17:05,850 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:05" (1/1) ... [2019-10-14 23:17:05,852 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:05" (1/1) ... [2019-10-14 23:17:05,855 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 23:17:05,855 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 23:17:05,855 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 23:17:05,856 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 23:17:05,856 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:05" (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 [2019-10-14 23:17:05,911 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 23:17:05,912 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 23:17:05,912 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 23:17:05,912 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 23:17:05,912 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 23:17:05,912 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 23:17:05,912 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2019-10-14 23:17:05,913 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 23:17:05,913 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 23:17:05,913 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2019-10-14 23:17:05,913 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 23:17:05,913 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 23:17:05,913 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 23:17:05,914 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 23:17:05,914 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 23:17:06,248 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 23:17:06,249 INFO L284 CfgBuilder]: Removed 6 assume(true) statements. [2019-10-14 23:17:06,250 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 11:17:06 BoogieIcfgContainer [2019-10-14 23:17:06,250 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 23:17:06,257 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 23:17:06,257 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 23:17:06,262 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 23:17:06,263 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 11:17:05" (1/3) ... [2019-10-14 23:17:06,264 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@507b2492 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 11:17:06, skipping insertion in model container [2019-10-14 23:17:06,264 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:05" (2/3) ... [2019-10-14 23:17:06,264 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@507b2492 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 11:17:06, skipping insertion in model container [2019-10-14 23:17:06,264 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 11:17:06" (3/3) ... [2019-10-14 23:17:06,266 INFO L109 eAbstractionObserver]: Analyzing ICFG vogal-2.i [2019-10-14 23:17:06,275 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 23:17:06,283 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 23:17:06,295 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 23:17:06,317 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 23:17:06,317 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 23:17:06,317 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 23:17:06,317 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 23:17:06,317 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 23:17:06,317 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 23:17:06,318 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 23:17:06,318 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 23:17:06,334 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states. [2019-10-14 23:17:06,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-14 23:17:06,341 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:06,342 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:06,344 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:06,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:06,350 INFO L82 PathProgramCache]: Analyzing trace with hash 907546272, now seen corresponding path program 1 times [2019-10-14 23:17:06,359 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:06,360 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [257431696] [2019-10-14 23:17:06,360 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:06,360 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:06,361 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:06,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:06,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:06,536 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:17:06,537 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [257431696] [2019-10-14 23:17:06,538 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:17:06,539 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 23:17:06,539 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516780324] [2019-10-14 23:17:06,544 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 23:17:06,545 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:06,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 23:17:06,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 23:17:06,564 INFO L87 Difference]: Start difference. First operand 36 states. Second operand 3 states. [2019-10-14 23:17:06,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:06,711 INFO L93 Difference]: Finished difference Result 64 states and 91 transitions. [2019-10-14 23:17:06,712 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 23:17:06,713 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2019-10-14 23:17:06,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:06,724 INFO L225 Difference]: With dead ends: 64 [2019-10-14 23:17:06,724 INFO L226 Difference]: Without dead ends: 29 [2019-10-14 23:17:06,728 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 23:17:06,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-14 23:17:06,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-10-14 23:17:06,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-14 23:17:06,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2019-10-14 23:17:06,779 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 17 [2019-10-14 23:17:06,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:06,780 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2019-10-14 23:17:06,780 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 23:17:06,781 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2019-10-14 23:17:06,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-14 23:17:06,782 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:06,782 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:06,783 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:06,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:06,783 INFO L82 PathProgramCache]: Analyzing trace with hash 1455815888, now seen corresponding path program 1 times [2019-10-14 23:17:06,784 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:06,784 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1367879806] [2019-10-14 23:17:06,784 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:06,785 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:06,785 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:06,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:06,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:06,894 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:17:06,895 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1367879806] [2019-10-14 23:17:06,895 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:17:06,896 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 23:17:06,896 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1447023040] [2019-10-14 23:17:06,897 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 23:17:06,898 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:06,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 23:17:06,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 23:17:06,899 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand 4 states. [2019-10-14 23:17:07,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:07,032 INFO L93 Difference]: Finished difference Result 65 states and 85 transitions. [2019-10-14 23:17:07,033 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 23:17:07,033 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2019-10-14 23:17:07,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:07,036 INFO L225 Difference]: With dead ends: 65 [2019-10-14 23:17:07,036 INFO L226 Difference]: Without dead ends: 44 [2019-10-14 23:17:07,037 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 23:17:07,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-10-14 23:17:07,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 30. [2019-10-14 23:17:07,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-10-14 23:17:07,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2019-10-14 23:17:07,050 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 19 [2019-10-14 23:17:07,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:07,051 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2019-10-14 23:17:07,051 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 23:17:07,051 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2019-10-14 23:17:07,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-14 23:17:07,052 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:07,053 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:07,053 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:07,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:07,054 INFO L82 PathProgramCache]: Analyzing trace with hash -941161554, now seen corresponding path program 1 times [2019-10-14 23:17:07,056 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:07,056 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [801320050] [2019-10-14 23:17:07,057 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:07,057 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:07,057 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:07,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:07,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:07,237 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:17:07,237 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [801320050] [2019-10-14 23:17:07,237 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1965514922] [2019-10-14 23:17:07,238 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 [2019-10-14 23:17:07,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:07,316 INFO L256 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 23:17:07,323 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:07,397 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 23:17:07,399 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-10-14 23:17:07,399 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 9 [2019-10-14 23:17:07,399 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669850121] [2019-10-14 23:17:07,400 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 23:17:07,400 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:07,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 23:17:07,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2019-10-14 23:17:07,402 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 6 states. [2019-10-14 23:17:07,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:07,481 INFO L93 Difference]: Finished difference Result 54 states and 69 transitions. [2019-10-14 23:17:07,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 23:17:07,482 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2019-10-14 23:17:07,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:07,484 INFO L225 Difference]: With dead ends: 54 [2019-10-14 23:17:07,484 INFO L226 Difference]: Without dead ends: 49 [2019-10-14 23:17:07,485 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2019-10-14 23:17:07,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-10-14 23:17:07,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 42. [2019-10-14 23:17:07,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-10-14 23:17:07,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 54 transitions. [2019-10-14 23:17:07,501 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 54 transitions. Word has length 21 [2019-10-14 23:17:07,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:07,504 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 54 transitions. [2019-10-14 23:17:07,505 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 23:17:07,505 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 54 transitions. [2019-10-14 23:17:07,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-14 23:17:07,506 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:07,506 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:07,720 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:07,720 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:07,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:07,720 INFO L82 PathProgramCache]: Analyzing trace with hash -1722235897, now seen corresponding path program 1 times [2019-10-14 23:17:07,721 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:07,722 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476605323] [2019-10-14 23:17:07,722 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:07,722 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:07,723 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:07,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:07,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:07,887 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 23:17:07,887 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476605323] [2019-10-14 23:17:07,888 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [902350202] [2019-10-14 23:17:07,889 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-10-14 23:17:07,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:07,950 INFO L256 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 23:17:07,954 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:07,983 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 23:17:07,984 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-10-14 23:17:07,985 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2019-10-14 23:17:07,985 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088982311] [2019-10-14 23:17:07,986 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 23:17:07,986 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:07,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 23:17:07,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-10-14 23:17:07,987 INFO L87 Difference]: Start difference. First operand 42 states and 54 transitions. Second operand 4 states. [2019-10-14 23:17:08,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:08,073 INFO L93 Difference]: Finished difference Result 99 states and 132 transitions. [2019-10-14 23:17:08,075 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 23:17:08,075 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 27 [2019-10-14 23:17:08,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:08,076 INFO L225 Difference]: With dead ends: 99 [2019-10-14 23:17:08,077 INFO L226 Difference]: Without dead ends: 70 [2019-10-14 23:17:08,077 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-10-14 23:17:08,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-10-14 23:17:08,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 46. [2019-10-14 23:17:08,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-10-14 23:17:08,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 59 transitions. [2019-10-14 23:17:08,094 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 59 transitions. Word has length 27 [2019-10-14 23:17:08,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:08,095 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 59 transitions. [2019-10-14 23:17:08,095 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 23:17:08,098 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 59 transitions. [2019-10-14 23:17:08,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-14 23:17:08,099 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:08,100 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:08,307 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:08,308 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:08,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:08,308 INFO L82 PathProgramCache]: Analyzing trace with hash 322541692, now seen corresponding path program 1 times [2019-10-14 23:17:08,309 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:08,309 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831138255] [2019-10-14 23:17:08,309 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:08,309 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:08,310 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:08,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:08,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:08,415 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-14 23:17:08,415 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831138255] [2019-10-14 23:17:08,415 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1434283288] [2019-10-14 23:17:08,416 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-10-14 23:17:08,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:08,477 INFO L256 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-14 23:17:08,479 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:08,608 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2019-10-14 23:17:08,609 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 23:17:08,620 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 23:17:08,620 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 23:17:08,620 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:3 [2019-10-14 23:17:08,633 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 23:17:08,634 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:17:08,634 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 9] total 12 [2019-10-14 23:17:08,634 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626130583] [2019-10-14 23:17:08,635 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 23:17:08,635 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:08,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 23:17:08,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2019-10-14 23:17:08,636 INFO L87 Difference]: Start difference. First operand 46 states and 59 transitions. Second operand 12 states. [2019-10-14 23:17:08,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:08,926 INFO L93 Difference]: Finished difference Result 137 states and 184 transitions. [2019-10-14 23:17:08,926 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 23:17:08,926 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2019-10-14 23:17:08,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:08,928 INFO L225 Difference]: With dead ends: 137 [2019-10-14 23:17:08,928 INFO L226 Difference]: Without dead ends: 95 [2019-10-14 23:17:08,929 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2019-10-14 23:17:08,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2019-10-14 23:17:08,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 46. [2019-10-14 23:17:08,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-10-14 23:17:08,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions. [2019-10-14 23:17:08,938 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 28 [2019-10-14 23:17:08,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:08,938 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 58 transitions. [2019-10-14 23:17:08,938 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 23:17:08,939 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions. [2019-10-14 23:17:08,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-10-14 23:17:08,940 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:08,940 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:09,144 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:09,145 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:09,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:09,145 INFO L82 PathProgramCache]: Analyzing trace with hash -494939968, now seen corresponding path program 1 times [2019-10-14 23:17:09,146 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:09,147 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1049299090] [2019-10-14 23:17:09,147 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:09,147 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:09,147 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:09,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:09,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:09,298 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 23:17:09,298 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1049299090] [2019-10-14 23:17:09,299 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1266933696] [2019-10-14 23:17:09,299 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-10-14 23:17:09,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:09,376 INFO L256 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-14 23:17:09,383 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:09,478 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-10-14 23:17:09,479 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 23:17:09,480 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 23:17:09,481 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 23:17:09,481 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-10-14 23:17:09,497 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 23:17:09,498 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:17:09,498 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9] total 13 [2019-10-14 23:17:09,498 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094970742] [2019-10-14 23:17:09,499 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 23:17:09,499 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:09,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 23:17:09,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2019-10-14 23:17:09,500 INFO L87 Difference]: Start difference. First operand 46 states and 58 transitions. Second operand 13 states. [2019-10-14 23:17:09,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:09,887 INFO L93 Difference]: Finished difference Result 156 states and 212 transitions. [2019-10-14 23:17:09,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 23:17:09,888 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2019-10-14 23:17:09,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:09,895 INFO L225 Difference]: With dead ends: 156 [2019-10-14 23:17:09,896 INFO L226 Difference]: Without dead ends: 121 [2019-10-14 23:17:09,896 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2019-10-14 23:17:09,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2019-10-14 23:17:09,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 50. [2019-10-14 23:17:09,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-10-14 23:17:09,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 62 transitions. [2019-10-14 23:17:09,917 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 62 transitions. Word has length 31 [2019-10-14 23:17:09,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:09,917 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 62 transitions. [2019-10-14 23:17:09,917 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 23:17:09,918 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 62 transitions. [2019-10-14 23:17:09,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-10-14 23:17:09,922 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:09,922 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:10,130 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:10,131 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:10,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:10,131 INFO L82 PathProgramCache]: Analyzing trace with hash 746697925, now seen corresponding path program 1 times [2019-10-14 23:17:10,131 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:10,132 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319614078] [2019-10-14 23:17:10,132 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:10,132 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:10,132 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:10,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:10,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:10,232 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-14 23:17:10,232 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [319614078] [2019-10-14 23:17:10,232 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [860577439] [2019-10-14 23:17:10,232 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-10-14 23:17:10,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:10,287 INFO L256 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 23:17:10,289 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:10,328 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 23:17:10,329 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:17:10,329 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2019-10-14 23:17:10,330 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828948167] [2019-10-14 23:17:10,331 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 23:17:10,331 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:10,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 23:17:10,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2019-10-14 23:17:10,333 INFO L87 Difference]: Start difference. First operand 50 states and 62 transitions. Second operand 9 states. [2019-10-14 23:17:10,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:10,882 INFO L93 Difference]: Finished difference Result 303 states and 447 transitions. [2019-10-14 23:17:10,883 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 23:17:10,883 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 34 [2019-10-14 23:17:10,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:10,885 INFO L225 Difference]: With dead ends: 303 [2019-10-14 23:17:10,885 INFO L226 Difference]: Without dead ends: 266 [2019-10-14 23:17:10,887 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2019-10-14 23:17:10,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2019-10-14 23:17:10,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 68. [2019-10-14 23:17:10,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-10-14 23:17:10,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 84 transitions. [2019-10-14 23:17:10,917 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 84 transitions. Word has length 34 [2019-10-14 23:17:10,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:10,921 INFO L462 AbstractCegarLoop]: Abstraction has 68 states and 84 transitions. [2019-10-14 23:17:10,921 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 23:17:10,921 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 84 transitions. [2019-10-14 23:17:10,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-14 23:17:10,922 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:10,922 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:11,123 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:11,127 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:11,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:11,127 INFO L82 PathProgramCache]: Analyzing trace with hash 108624021, now seen corresponding path program 2 times [2019-10-14 23:17:11,127 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:11,127 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1888568886] [2019-10-14 23:17:11,127 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:11,128 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:11,128 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:11,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:11,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:11,280 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 23:17:11,281 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1888568886] [2019-10-14 23:17:11,281 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [359955389] [2019-10-14 23:17:11,282 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 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 [2019-10-14 23:17:11,355 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:17:11,355 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:17:11,357 INFO L256 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 23:17:11,366 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:11,433 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 2 proven. 19 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 23:17:11,434 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:17:11,435 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2019-10-14 23:17:11,436 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355589483] [2019-10-14 23:17:11,436 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 23:17:11,437 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:11,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 23:17:11,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2019-10-14 23:17:11,438 INFO L87 Difference]: Start difference. First operand 68 states and 84 transitions. Second operand 11 states. [2019-10-14 23:17:12,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:12,468 INFO L93 Difference]: Finished difference Result 442 states and 618 transitions. [2019-10-14 23:17:12,468 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-14 23:17:12,468 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2019-10-14 23:17:12,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:12,471 INFO L225 Difference]: With dead ends: 442 [2019-10-14 23:17:12,471 INFO L226 Difference]: Without dead ends: 389 [2019-10-14 23:17:12,472 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=107, Invalid=543, Unknown=0, NotChecked=0, Total=650 [2019-10-14 23:17:12,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2019-10-14 23:17:12,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 82. [2019-10-14 23:17:12,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-10-14 23:17:12,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 102 transitions. [2019-10-14 23:17:12,487 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 102 transitions. Word has length 39 [2019-10-14 23:17:12,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:12,488 INFO L462 AbstractCegarLoop]: Abstraction has 82 states and 102 transitions. [2019-10-14 23:17:12,488 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 23:17:12,488 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 102 transitions. [2019-10-14 23:17:12,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-10-14 23:17:12,489 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:12,490 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:12,693 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:12,693 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:12,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:12,693 INFO L82 PathProgramCache]: Analyzing trace with hash 2007709385, now seen corresponding path program 3 times [2019-10-14 23:17:12,694 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:12,694 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831103331] [2019-10-14 23:17:12,694 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:12,694 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:12,694 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:12,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:12,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:12,835 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-14 23:17:12,835 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831103331] [2019-10-14 23:17:12,835 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [721451174] [2019-10-14 23:17:12,835 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 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 [2019-10-14 23:17:12,903 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-14 23:17:12,903 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:17:12,904 INFO L256 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 25 conjunts are in the unsatisfiable core [2019-10-14 23:17:12,907 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:13,004 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 23:17:13,025 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-14 23:17:13,029 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 16 [2019-10-14 23:17:13,030 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 23:17:13,034 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-14 23:17:13,035 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-10-14 23:17:13,039 INFO L567 ElimStorePlain]: treesize reduction 6, result has 33.3 percent of original size [2019-10-14 23:17:13,040 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 23:17:13,040 INFO L221 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:64, output treesize:3 [2019-10-14 23:17:13,071 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-10-14 23:17:13,071 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:17:13,071 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2019-10-14 23:17:13,072 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711621894] [2019-10-14 23:17:13,072 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-14 23:17:13,073 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:13,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-14 23:17:13,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2019-10-14 23:17:13,073 INFO L87 Difference]: Start difference. First operand 82 states and 102 transitions. Second operand 16 states. [2019-10-14 23:17:14,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:14,218 INFO L93 Difference]: Finished difference Result 677 states and 901 transitions. [2019-10-14 23:17:14,219 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 23:17:14,219 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 44 [2019-10-14 23:17:14,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:14,223 INFO L225 Difference]: With dead ends: 677 [2019-10-14 23:17:14,223 INFO L226 Difference]: Without dead ends: 612 [2019-10-14 23:17:14,226 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=132, Invalid=570, Unknown=0, NotChecked=0, Total=702 [2019-10-14 23:17:14,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 612 states. [2019-10-14 23:17:14,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 612 to 110. [2019-10-14 23:17:14,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2019-10-14 23:17:14,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 138 transitions. [2019-10-14 23:17:14,257 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 138 transitions. Word has length 44 [2019-10-14 23:17:14,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:14,257 INFO L462 AbstractCegarLoop]: Abstraction has 110 states and 138 transitions. [2019-10-14 23:17:14,257 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-14 23:17:14,257 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 138 transitions. [2019-10-14 23:17:14,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-10-14 23:17:14,266 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:14,266 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:14,469 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:14,469 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:14,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:14,470 INFO L82 PathProgramCache]: Analyzing trace with hash 1232135728, now seen corresponding path program 4 times [2019-10-14 23:17:14,470 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:14,471 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1600353808] [2019-10-14 23:17:14,471 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:14,471 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:14,472 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:14,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:14,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:14,642 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2019-10-14 23:17:14,642 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1600353808] [2019-10-14 23:17:14,643 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [71920079] [2019-10-14 23:17:14,643 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 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 [2019-10-14 23:17:14,714 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:17:14,715 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:17:14,716 INFO L256 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-14 23:17:14,722 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:14,781 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 2 proven. 42 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-14 23:17:14,781 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:17:14,781 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2019-10-14 23:17:14,782 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516214484] [2019-10-14 23:17:14,783 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 23:17:14,783 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:14,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 23:17:14,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2019-10-14 23:17:14,785 INFO L87 Difference]: Start difference. First operand 110 states and 138 transitions. Second operand 14 states. [2019-10-14 23:17:16,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:16,625 INFO L93 Difference]: Finished difference Result 738 states and 1026 transitions. [2019-10-14 23:17:16,626 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2019-10-14 23:17:16,626 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 48 [2019-10-14 23:17:16,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:16,630 INFO L225 Difference]: With dead ends: 738 [2019-10-14 23:17:16,630 INFO L226 Difference]: Without dead ends: 647 [2019-10-14 23:17:16,632 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=191, Invalid=1531, Unknown=0, NotChecked=0, Total=1722 [2019-10-14 23:17:16,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 647 states. [2019-10-14 23:17:16,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 647 to 130. [2019-10-14 23:17:16,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2019-10-14 23:17:16,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 164 transitions. [2019-10-14 23:17:16,652 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 164 transitions. Word has length 48 [2019-10-14 23:17:16,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:16,653 INFO L462 AbstractCegarLoop]: Abstraction has 130 states and 164 transitions. [2019-10-14 23:17:16,653 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 23:17:16,653 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 164 transitions. [2019-10-14 23:17:16,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-10-14 23:17:16,654 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:16,655 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:16,867 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:16,868 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:16,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:16,868 INFO L82 PathProgramCache]: Analyzing trace with hash -548204854, now seen corresponding path program 5 times [2019-10-14 23:17:16,869 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:16,869 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1415832245] [2019-10-14 23:17:16,869 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:16,869 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:16,872 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:16,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:17,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:17,053 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-14 23:17:17,054 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1415832245] [2019-10-14 23:17:17,054 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1472065060] [2019-10-14 23:17:17,056 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 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 [2019-10-14 23:17:17,220 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2019-10-14 23:17:17,220 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:17:17,223 INFO L256 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-14 23:17:17,228 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:17,298 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 2 proven. 22 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-10-14 23:17:17,298 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:17:17,298 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7] total 16 [2019-10-14 23:17:17,299 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323601951] [2019-10-14 23:17:17,299 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-14 23:17:17,300 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:17,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-14 23:17:17,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2019-10-14 23:17:17,301 INFO L87 Difference]: Start difference. First operand 130 states and 164 transitions. Second operand 16 states. [2019-10-14 23:17:20,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:20,165 INFO L93 Difference]: Finished difference Result 945 states and 1308 transitions. [2019-10-14 23:17:20,166 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2019-10-14 23:17:20,166 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 53 [2019-10-14 23:17:20,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:20,172 INFO L225 Difference]: With dead ends: 945 [2019-10-14 23:17:20,172 INFO L226 Difference]: Without dead ends: 836 [2019-10-14 23:17:20,175 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 786 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=266, Invalid=2814, Unknown=0, NotChecked=0, Total=3080 [2019-10-14 23:17:20,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 836 states. [2019-10-14 23:17:20,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 836 to 150. [2019-10-14 23:17:20,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2019-10-14 23:17:20,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 190 transitions. [2019-10-14 23:17:20,199 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 190 transitions. Word has length 53 [2019-10-14 23:17:20,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:20,199 INFO L462 AbstractCegarLoop]: Abstraction has 150 states and 190 transitions. [2019-10-14 23:17:20,200 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-14 23:17:20,200 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 190 transitions. [2019-10-14 23:17:20,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-10-14 23:17:20,202 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:20,202 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:20,406 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:20,406 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:20,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:20,407 INFO L82 PathProgramCache]: Analyzing trace with hash -791255820, now seen corresponding path program 6 times [2019-10-14 23:17:20,407 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:20,407 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1361857824] [2019-10-14 23:17:20,407 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:20,408 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:20,408 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:20,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:20,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:20,564 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2019-10-14 23:17:20,565 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1361857824] [2019-10-14 23:17:20,566 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364085685] [2019-10-14 23:17:20,567 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 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 [2019-10-14 23:17:20,633 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2019-10-14 23:17:20,634 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:17:20,634 INFO L256 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-14 23:17:20,637 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:20,779 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 23:17:20,914 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-14 23:17:20,923 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 23:17:20,923 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 10 [2019-10-14 23:17:20,924 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 23:17:20,933 INFO L567 ElimStorePlain]: treesize reduction 5, result has 64.3 percent of original size [2019-10-14 23:17:20,934 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 23:17:20,935 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:27, output treesize:3 [2019-10-14 23:17:20,957 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2019-10-14 23:17:20,957 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:17:20,957 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 20 [2019-10-14 23:17:20,958 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886127348] [2019-10-14 23:17:20,958 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 23:17:20,958 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:20,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 23:17:20,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=319, Unknown=0, NotChecked=0, Total=380 [2019-10-14 23:17:20,959 INFO L87 Difference]: Start difference. First operand 150 states and 190 transitions. Second operand 20 states. [2019-10-14 23:17:22,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:22,865 INFO L93 Difference]: Finished difference Result 968 states and 1288 transitions. [2019-10-14 23:17:22,873 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-14 23:17:22,873 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 58 [2019-10-14 23:17:22,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:22,878 INFO L225 Difference]: With dead ends: 968 [2019-10-14 23:17:22,878 INFO L226 Difference]: Without dead ends: 838 [2019-10-14 23:17:22,879 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 228 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=206, Invalid=1200, Unknown=0, NotChecked=0, Total=1406 [2019-10-14 23:17:22,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 838 states. [2019-10-14 23:17:22,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 838 to 153. [2019-10-14 23:17:22,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2019-10-14 23:17:22,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 193 transitions. [2019-10-14 23:17:22,909 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 193 transitions. Word has length 58 [2019-10-14 23:17:22,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:22,910 INFO L462 AbstractCegarLoop]: Abstraction has 153 states and 193 transitions. [2019-10-14 23:17:22,910 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 23:17:22,910 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 193 transitions. [2019-10-14 23:17:22,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2019-10-14 23:17:22,911 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:22,911 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 5, 5, 5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:23,115 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:23,116 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:23,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:23,117 INFO L82 PathProgramCache]: Analyzing trace with hash -1011860072, now seen corresponding path program 1 times [2019-10-14 23:17:23,117 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:23,117 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59223553] [2019-10-14 23:17:23,118 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:23,118 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:23,118 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:23,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:23,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:23,329 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2019-10-14 23:17:23,329 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59223553] [2019-10-14 23:17:23,330 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [348335279] [2019-10-14 23:17:23,330 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-10-14 23:17:23,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:23,421 INFO L256 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 26 conjunts are in the unsatisfiable core [2019-10-14 23:17:23,425 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:23,530 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 2 proven. 104 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-10-14 23:17:23,530 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:17:23,531 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 19 [2019-10-14 23:17:23,531 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897330487] [2019-10-14 23:17:23,531 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-14 23:17:23,531 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:23,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-14 23:17:23,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=298, Unknown=0, NotChecked=0, Total=342 [2019-10-14 23:17:23,532 INFO L87 Difference]: Start difference. First operand 153 states and 193 transitions. Second operand 19 states. [2019-10-14 23:17:28,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:28,274 INFO L93 Difference]: Finished difference Result 1275 states and 1759 transitions. [2019-10-14 23:17:28,274 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2019-10-14 23:17:28,274 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 76 [2019-10-14 23:17:28,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:28,280 INFO L225 Difference]: With dead ends: 1275 [2019-10-14 23:17:28,281 INFO L226 Difference]: Without dead ends: 1147 [2019-10-14 23:17:28,283 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 131 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1779 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=392, Invalid=5770, Unknown=0, NotChecked=0, Total=6162 [2019-10-14 23:17:28,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1147 states. [2019-10-14 23:17:28,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1147 to 173. [2019-10-14 23:17:28,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2019-10-14 23:17:28,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 219 transitions. [2019-10-14 23:17:28,315 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 219 transitions. Word has length 76 [2019-10-14 23:17:28,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:28,315 INFO L462 AbstractCegarLoop]: Abstraction has 173 states and 219 transitions. [2019-10-14 23:17:28,315 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-14 23:17:28,315 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 219 transitions. [2019-10-14 23:17:28,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2019-10-14 23:17:28,316 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:28,317 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 6, 6, 6, 6, 6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:28,518 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:28,519 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:28,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:28,520 INFO L82 PathProgramCache]: Analyzing trace with hash -958458641, now seen corresponding path program 2 times [2019-10-14 23:17:28,520 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:28,520 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [702027694] [2019-10-14 23:17:28,521 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:28,521 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:28,521 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:28,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:28,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:28,707 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 2 proven. 51 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2019-10-14 23:17:28,708 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [702027694] [2019-10-14 23:17:28,708 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [281084154] [2019-10-14 23:17:28,708 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 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 [2019-10-14 23:17:28,826 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:17:28,826 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:17:28,829 INFO L256 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-14 23:17:28,833 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:28,986 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 2 proven. 139 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-10-14 23:17:28,987 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:17:28,987 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 16] total 18 [2019-10-14 23:17:28,987 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955538479] [2019-10-14 23:17:28,988 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-14 23:17:28,988 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:28,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-14 23:17:28,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=266, Unknown=0, NotChecked=0, Total=306 [2019-10-14 23:17:28,989 INFO L87 Difference]: Start difference. First operand 173 states and 219 transitions. Second operand 18 states. [2019-10-14 23:17:32,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:32,733 INFO L93 Difference]: Finished difference Result 1056 states and 1447 transitions. [2019-10-14 23:17:32,733 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2019-10-14 23:17:32,734 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 84 [2019-10-14 23:17:32,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:32,741 INFO L225 Difference]: With dead ends: 1056 [2019-10-14 23:17:32,741 INFO L226 Difference]: Without dead ends: 957 [2019-10-14 23:17:32,744 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 126 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1187 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=285, Invalid=4137, Unknown=0, NotChecked=0, Total=4422 [2019-10-14 23:17:32,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 957 states. [2019-10-14 23:17:32,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 957 to 191. [2019-10-14 23:17:32,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 191 states. [2019-10-14 23:17:32,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 243 transitions. [2019-10-14 23:17:32,780 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 243 transitions. Word has length 84 [2019-10-14 23:17:32,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:32,781 INFO L462 AbstractCegarLoop]: Abstraction has 191 states and 243 transitions. [2019-10-14 23:17:32,781 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-14 23:17:32,781 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 243 transitions. [2019-10-14 23:17:32,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2019-10-14 23:17:32,785 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:32,785 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 7, 7, 7, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:32,989 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:32,989 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:32,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:32,990 INFO L82 PathProgramCache]: Analyzing trace with hash 1787205274, now seen corresponding path program 3 times [2019-10-14 23:17:32,990 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:32,991 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045920333] [2019-10-14 23:17:32,991 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:32,991 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:32,992 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:33,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:33,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:33,221 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 2 proven. 70 refuted. 0 times theorem prover too weak. 173 trivial. 0 not checked. [2019-10-14 23:17:33,222 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045920333] [2019-10-14 23:17:33,222 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [560400802] [2019-10-14 23:17:33,223 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 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 [2019-10-14 23:17:33,889 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-10-14 23:17:33,890 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:17:33,892 INFO L256 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 38 conjunts are in the unsatisfiable core [2019-10-14 23:17:33,893 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:34,230 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 143 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2019-10-14 23:17:34,231 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:17:34,231 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 20] total 29 [2019-10-14 23:17:34,231 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037746379] [2019-10-14 23:17:34,232 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-14 23:17:34,232 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:34,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-14 23:17:34,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=742, Unknown=0, NotChecked=0, Total=812 [2019-10-14 23:17:34,233 INFO L87 Difference]: Start difference. First operand 191 states and 243 transitions. Second operand 29 states. [2019-10-14 23:17:45,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:45,051 INFO L93 Difference]: Finished difference Result 1159 states and 1580 transitions. [2019-10-14 23:17:45,051 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 157 states. [2019-10-14 23:17:45,051 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 90 [2019-10-14 23:17:45,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:45,057 INFO L225 Difference]: With dead ends: 1159 [2019-10-14 23:17:45,057 INFO L226 Difference]: Without dead ends: 1045 [2019-10-14 23:17:45,064 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8729 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1000, Invalid=24122, Unknown=0, NotChecked=0, Total=25122 [2019-10-14 23:17:45,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1045 states. [2019-10-14 23:17:45,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1045 to 677. [2019-10-14 23:17:45,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 677 states. [2019-10-14 23:17:45,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 677 states to 677 states and 904 transitions. [2019-10-14 23:17:45,196 INFO L78 Accepts]: Start accepts. Automaton has 677 states and 904 transitions. Word has length 90 [2019-10-14 23:17:45,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:45,197 INFO L462 AbstractCegarLoop]: Abstraction has 677 states and 904 transitions. [2019-10-14 23:17:45,197 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-14 23:17:45,197 INFO L276 IsEmpty]: Start isEmpty. Operand 677 states and 904 transitions. [2019-10-14 23:17:45,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2019-10-14 23:17:45,199 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:45,200 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 8, 8, 8, 8, 8, 8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:45,404 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:45,405 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:45,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:45,406 INFO L82 PathProgramCache]: Analyzing trace with hash 1283842895, now seen corresponding path program 4 times [2019-10-14 23:17:45,406 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:45,406 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1169712146] [2019-10-14 23:17:45,407 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:45,407 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:45,407 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:45,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:45,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:45,625 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 2 proven. 92 refuted. 0 times theorem prover too weak. 195 trivial. 0 not checked. [2019-10-14 23:17:45,626 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1169712146] [2019-10-14 23:17:45,626 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1923155141] [2019-10-14 23:17:45,626 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 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 [2019-10-14 23:17:45,739 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:17:45,739 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:17:45,740 INFO L256 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 38 conjunts are in the unsatisfiable core [2019-10-14 23:17:45,742 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:45,901 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 2 proven. 190 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked. [2019-10-14 23:17:45,901 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:17:45,902 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 20] total 22 [2019-10-14 23:17:45,902 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301537167] [2019-10-14 23:17:45,902 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-14 23:17:45,902 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:45,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-14 23:17:45,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=412, Unknown=0, NotChecked=0, Total=462 [2019-10-14 23:17:45,903 INFO L87 Difference]: Start difference. First operand 677 states and 904 transitions. Second operand 22 states.